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5060 | serge | 1 | /* |
2 | * Copyright © 2014 Red Hat |
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3 | * |
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4 | * Permission to use, copy, modify, distribute, and sell this software and its |
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5 | * documentation for any purpose is hereby granted without fee, provided that |
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6 | * the above copyright notice appear in all copies and that both that copyright |
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7 | * notice and this permission notice appear in supporting documentation, and |
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8 | * that the name of the copyright holders not be used in advertising or |
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9 | * publicity pertaining to distribution of the software without specific, |
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10 | * written prior permission. The copyright holders make no representations |
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11 | * about the suitability of this software for any purpose. It is provided "as |
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12 | * is" without express or implied warranty. |
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13 | * |
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14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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20 | * OF THIS SOFTWARE. |
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21 | */ |
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22 | |||
23 | #include |
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24 | #include |
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6088 | serge | 25 | #include |
5060 | serge | 26 | #include |
27 | #include |
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28 | #include |
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29 | #include |
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30 | #include |
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31 | #include |
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32 | |||
33 | #include |
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34 | |||
35 | u64 get_jiffies_64(void) |
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36 | { |
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37 | return jiffies; |
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38 | } |
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39 | /** |
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40 | * DOC: dp mst helper |
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41 | * |
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42 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport |
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43 | * protocol. The helpers contain a topology manager and bandwidth manager. |
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44 | * The helpers encapsulate the sending and received of sideband msgs. |
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45 | */ |
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46 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
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47 | char *buf); |
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48 | static int test_calc_pbn_mode(void); |
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49 | |||
50 | static void drm_dp_put_port(struct drm_dp_mst_port *port); |
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51 | |||
52 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
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53 | int id, |
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54 | struct drm_dp_payload *payload); |
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55 | |||
56 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
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57 | struct drm_dp_mst_port *port, |
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58 | int offset, int size, u8 *bytes); |
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59 | |||
6084 | serge | 60 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
61 | struct drm_dp_mst_branch *mstb); |
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5060 | serge | 62 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
63 | struct drm_dp_mst_branch *mstb, |
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64 | struct drm_dp_mst_port *port); |
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65 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
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66 | u8 *guid); |
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67 | |||
68 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); |
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69 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); |
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70 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); |
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71 | /* sideband msg handling */ |
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72 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) |
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73 | { |
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74 | u8 bitmask = 0x80; |
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75 | u8 bitshift = 7; |
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76 | u8 array_index = 0; |
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77 | int number_of_bits = num_nibbles * 4; |
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78 | u8 remainder = 0; |
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79 | |||
80 | while (number_of_bits != 0) { |
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81 | number_of_bits--; |
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82 | remainder <<= 1; |
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83 | remainder |= (data[array_index] & bitmask) >> bitshift; |
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84 | bitmask >>= 1; |
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85 | bitshift--; |
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86 | if (bitmask == 0) { |
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87 | bitmask = 0x80; |
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88 | bitshift = 7; |
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89 | array_index++; |
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90 | } |
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91 | if ((remainder & 0x10) == 0x10) |
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92 | remainder ^= 0x13; |
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93 | } |
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94 | |||
95 | number_of_bits = 4; |
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96 | while (number_of_bits != 0) { |
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97 | number_of_bits--; |
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98 | remainder <<= 1; |
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99 | if ((remainder & 0x10) != 0) |
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100 | remainder ^= 0x13; |
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101 | } |
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102 | |||
103 | return remainder; |
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104 | } |
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105 | |||
106 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) |
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107 | { |
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108 | u8 bitmask = 0x80; |
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109 | u8 bitshift = 7; |
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110 | u8 array_index = 0; |
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111 | int number_of_bits = number_of_bytes * 8; |
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112 | u16 remainder = 0; |
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113 | |||
114 | while (number_of_bits != 0) { |
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115 | number_of_bits--; |
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116 | remainder <<= 1; |
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117 | remainder |= (data[array_index] & bitmask) >> bitshift; |
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118 | bitmask >>= 1; |
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119 | bitshift--; |
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120 | if (bitmask == 0) { |
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121 | bitmask = 0x80; |
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122 | bitshift = 7; |
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123 | array_index++; |
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124 | } |
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125 | if ((remainder & 0x100) == 0x100) |
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126 | remainder ^= 0xd5; |
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127 | } |
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128 | |||
129 | number_of_bits = 8; |
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130 | while (number_of_bits != 0) { |
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131 | number_of_bits--; |
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132 | remainder <<= 1; |
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133 | if ((remainder & 0x100) != 0) |
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134 | remainder ^= 0xd5; |
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135 | } |
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136 | |||
137 | return remainder & 0xff; |
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138 | } |
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139 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) |
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140 | { |
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141 | u8 size = 3; |
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142 | size += (hdr->lct / 2); |
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143 | return size; |
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144 | } |
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145 | |||
146 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
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147 | u8 *buf, int *len) |
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148 | { |
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149 | int idx = 0; |
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150 | int i; |
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151 | u8 crc4; |
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152 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); |
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153 | for (i = 0; i < (hdr->lct / 2); i++) |
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154 | buf[idx++] = hdr->rad[i]; |
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155 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | |
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156 | (hdr->msg_len & 0x3f); |
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157 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); |
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158 | |||
159 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); |
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160 | buf[idx - 1] |= (crc4 & 0xf); |
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161 | |||
162 | *len = idx; |
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163 | } |
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164 | |||
165 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
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166 | u8 *buf, int buflen, u8 *hdrlen) |
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167 | { |
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168 | u8 crc4; |
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169 | u8 len; |
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170 | int i; |
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171 | u8 idx; |
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172 | if (buf[0] == 0) |
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173 | return false; |
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174 | len = 3; |
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175 | len += ((buf[0] & 0xf0) >> 4) / 2; |
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176 | if (len > buflen) |
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177 | return false; |
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178 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); |
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179 | |||
180 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { |
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181 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); |
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182 | return false; |
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183 | } |
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184 | |||
185 | hdr->lct = (buf[0] & 0xf0) >> 4; |
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186 | hdr->lcr = (buf[0] & 0xf); |
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187 | idx = 1; |
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188 | for (i = 0; i < (hdr->lct / 2); i++) |
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189 | hdr->rad[i] = buf[idx++]; |
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190 | hdr->broadcast = (buf[idx] >> 7) & 0x1; |
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191 | hdr->path_msg = (buf[idx] >> 6) & 0x1; |
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192 | hdr->msg_len = buf[idx] & 0x3f; |
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193 | idx++; |
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194 | hdr->somt = (buf[idx] >> 7) & 0x1; |
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195 | hdr->eomt = (buf[idx] >> 6) & 0x1; |
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196 | hdr->seqno = (buf[idx] >> 4) & 0x1; |
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197 | idx++; |
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198 | *hdrlen = idx; |
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199 | return true; |
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200 | } |
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201 | |||
202 | static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, |
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203 | struct drm_dp_sideband_msg_tx *raw) |
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204 | { |
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205 | int idx = 0; |
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206 | int i; |
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207 | u8 *buf = raw->msg; |
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208 | buf[idx++] = req->req_type & 0x7f; |
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209 | |||
210 | switch (req->req_type) { |
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211 | case DP_ENUM_PATH_RESOURCES: |
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212 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
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213 | idx++; |
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214 | break; |
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215 | case DP_ALLOCATE_PAYLOAD: |
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216 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | |
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217 | (req->u.allocate_payload.number_sdp_streams & 0xf); |
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218 | idx++; |
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219 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); |
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220 | idx++; |
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221 | buf[idx] = (req->u.allocate_payload.pbn >> 8); |
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222 | idx++; |
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223 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); |
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224 | idx++; |
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225 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { |
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226 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | |
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227 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); |
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228 | idx++; |
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229 | } |
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230 | if (req->u.allocate_payload.number_sdp_streams & 1) { |
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231 | i = req->u.allocate_payload.number_sdp_streams - 1; |
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232 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; |
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233 | idx++; |
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234 | } |
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235 | break; |
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236 | case DP_QUERY_PAYLOAD: |
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237 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; |
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238 | idx++; |
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239 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); |
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240 | idx++; |
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241 | break; |
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242 | case DP_REMOTE_DPCD_READ: |
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243 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; |
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244 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; |
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245 | idx++; |
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246 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; |
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247 | idx++; |
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248 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); |
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249 | idx++; |
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250 | buf[idx] = (req->u.dpcd_read.num_bytes); |
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251 | idx++; |
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252 | break; |
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253 | |||
254 | case DP_REMOTE_DPCD_WRITE: |
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255 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; |
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256 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; |
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257 | idx++; |
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258 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; |
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259 | idx++; |
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260 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); |
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261 | idx++; |
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262 | buf[idx] = (req->u.dpcd_write.num_bytes); |
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263 | idx++; |
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264 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); |
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265 | idx += req->u.dpcd_write.num_bytes; |
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266 | break; |
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267 | case DP_REMOTE_I2C_READ: |
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268 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; |
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269 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); |
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270 | idx++; |
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271 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { |
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272 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; |
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273 | idx++; |
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274 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; |
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275 | idx++; |
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276 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); |
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277 | idx += req->u.i2c_read.transactions[i].num_bytes; |
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278 | |||
279 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; |
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280 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); |
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281 | idx++; |
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282 | } |
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283 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; |
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284 | idx++; |
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285 | buf[idx] = (req->u.i2c_read.num_bytes_read); |
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286 | idx++; |
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287 | break; |
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288 | |||
289 | case DP_REMOTE_I2C_WRITE: |
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290 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; |
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291 | idx++; |
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292 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; |
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293 | idx++; |
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294 | buf[idx] = (req->u.i2c_write.num_bytes); |
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295 | idx++; |
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296 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); |
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297 | idx += req->u.i2c_write.num_bytes; |
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298 | break; |
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299 | } |
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300 | raw->cur_len = idx; |
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301 | } |
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302 | |||
303 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) |
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304 | { |
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305 | u8 crc4; |
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306 | crc4 = drm_dp_msg_data_crc4(msg, len); |
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307 | msg[len] = crc4; |
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308 | } |
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309 | |||
310 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, |
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311 | struct drm_dp_sideband_msg_tx *raw) |
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312 | { |
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313 | int idx = 0; |
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314 | u8 *buf = raw->msg; |
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315 | |||
316 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); |
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317 | |||
318 | raw->cur_len = idx; |
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319 | } |
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320 | |||
321 | /* this adds a chunk of msg to the builder to get the final msg */ |
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322 | static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, |
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323 | u8 *replybuf, u8 replybuflen, bool hdr) |
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324 | { |
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325 | int ret; |
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326 | u8 crc4; |
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327 | |||
328 | if (hdr) { |
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329 | u8 hdrlen; |
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330 | struct drm_dp_sideband_msg_hdr recv_hdr; |
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331 | ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); |
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332 | if (ret == false) { |
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333 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); |
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334 | return false; |
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335 | } |
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336 | |||
337 | /* get length contained in this portion */ |
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338 | msg->curchunk_len = recv_hdr.msg_len; |
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339 | msg->curchunk_hdrlen = hdrlen; |
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340 | |||
341 | /* we have already gotten an somt - don't bother parsing */ |
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342 | if (recv_hdr.somt && msg->have_somt) |
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343 | return false; |
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344 | |||
345 | if (recv_hdr.somt) { |
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346 | memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); |
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347 | msg->have_somt = true; |
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348 | } |
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349 | if (recv_hdr.eomt) |
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350 | msg->have_eomt = true; |
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351 | |||
352 | /* copy the bytes for the remainder of this header chunk */ |
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353 | msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); |
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354 | memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); |
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355 | } else { |
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356 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); |
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357 | msg->curchunk_idx += replybuflen; |
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358 | } |
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359 | |||
360 | if (msg->curchunk_idx >= msg->curchunk_len) { |
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361 | /* do CRC */ |
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362 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); |
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363 | /* copy chunk into bigger msg */ |
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364 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); |
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365 | msg->curlen += msg->curchunk_len - 1; |
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366 | } |
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367 | return true; |
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368 | } |
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369 | |||
370 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, |
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371 | struct drm_dp_sideband_msg_reply_body *repmsg) |
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372 | { |
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373 | int idx = 1; |
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374 | int i; |
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375 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); |
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376 | idx += 16; |
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377 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; |
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378 | idx++; |
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379 | if (idx > raw->curlen) |
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380 | goto fail_len; |
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381 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { |
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382 | if (raw->msg[idx] & 0x80) |
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383 | repmsg->u.link_addr.ports[i].input_port = 1; |
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384 | |||
385 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; |
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386 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); |
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387 | |||
388 | idx++; |
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389 | if (idx > raw->curlen) |
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390 | goto fail_len; |
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391 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; |
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392 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; |
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393 | if (repmsg->u.link_addr.ports[i].input_port == 0) |
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394 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
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395 | idx++; |
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396 | if (idx > raw->curlen) |
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397 | goto fail_len; |
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398 | if (repmsg->u.link_addr.ports[i].input_port == 0) { |
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399 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); |
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400 | idx++; |
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401 | if (idx > raw->curlen) |
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402 | goto fail_len; |
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403 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); |
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404 | idx += 16; |
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405 | if (idx > raw->curlen) |
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406 | goto fail_len; |
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407 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; |
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408 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); |
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409 | idx++; |
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410 | |||
411 | } |
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412 | if (idx > raw->curlen) |
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413 | goto fail_len; |
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414 | } |
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415 | |||
416 | return true; |
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417 | fail_len: |
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418 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
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419 | return false; |
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420 | } |
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421 | |||
422 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, |
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423 | struct drm_dp_sideband_msg_reply_body *repmsg) |
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424 | { |
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425 | int idx = 1; |
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426 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; |
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427 | idx++; |
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428 | if (idx > raw->curlen) |
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429 | goto fail_len; |
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430 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; |
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431 | if (idx > raw->curlen) |
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432 | goto fail_len; |
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433 | |||
434 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); |
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435 | return true; |
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436 | fail_len: |
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437 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
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438 | return false; |
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439 | } |
||
440 | |||
441 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, |
||
442 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
443 | { |
||
444 | int idx = 1; |
||
445 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; |
||
446 | idx++; |
||
447 | if (idx > raw->curlen) |
||
448 | goto fail_len; |
||
449 | return true; |
||
450 | fail_len: |
||
451 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); |
||
452 | return false; |
||
453 | } |
||
454 | |||
455 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, |
||
456 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
457 | { |
||
458 | int idx = 1; |
||
459 | |||
460 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); |
||
461 | idx++; |
||
462 | if (idx > raw->curlen) |
||
463 | goto fail_len; |
||
464 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; |
||
465 | idx++; |
||
466 | /* TODO check */ |
||
467 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); |
||
468 | return true; |
||
469 | fail_len: |
||
470 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); |
||
471 | return false; |
||
472 | } |
||
473 | |||
474 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, |
||
475 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
476 | { |
||
477 | int idx = 1; |
||
478 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; |
||
479 | idx++; |
||
480 | if (idx > raw->curlen) |
||
481 | goto fail_len; |
||
482 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
||
483 | idx += 2; |
||
484 | if (idx > raw->curlen) |
||
485 | goto fail_len; |
||
486 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
||
487 | idx += 2; |
||
488 | if (idx > raw->curlen) |
||
489 | goto fail_len; |
||
490 | return true; |
||
491 | fail_len: |
||
492 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); |
||
493 | return false; |
||
494 | } |
||
495 | |||
496 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
||
497 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
498 | { |
||
499 | int idx = 1; |
||
500 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
||
501 | idx++; |
||
502 | if (idx > raw->curlen) |
||
503 | goto fail_len; |
||
504 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; |
||
505 | idx++; |
||
506 | if (idx > raw->curlen) |
||
507 | goto fail_len; |
||
508 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
||
509 | idx += 2; |
||
510 | if (idx > raw->curlen) |
||
511 | goto fail_len; |
||
512 | return true; |
||
513 | fail_len: |
||
514 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); |
||
515 | return false; |
||
516 | } |
||
517 | |||
518 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
||
519 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
520 | { |
||
521 | int idx = 1; |
||
522 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
||
523 | idx++; |
||
524 | if (idx > raw->curlen) |
||
525 | goto fail_len; |
||
526 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
||
527 | idx += 2; |
||
528 | if (idx > raw->curlen) |
||
529 | goto fail_len; |
||
530 | return true; |
||
531 | fail_len: |
||
532 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); |
||
533 | return false; |
||
534 | } |
||
535 | |||
536 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
||
537 | struct drm_dp_sideband_msg_reply_body *msg) |
||
538 | { |
||
539 | memset(msg, 0, sizeof(*msg)); |
||
540 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; |
||
541 | msg->req_type = (raw->msg[0] & 0x7f); |
||
542 | |||
543 | if (msg->reply_type) { |
||
544 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); |
||
545 | msg->u.nak.reason = raw->msg[17]; |
||
546 | msg->u.nak.nak_data = raw->msg[18]; |
||
547 | return false; |
||
548 | } |
||
549 | |||
550 | switch (msg->req_type) { |
||
551 | case DP_LINK_ADDRESS: |
||
552 | return drm_dp_sideband_parse_link_address(raw, msg); |
||
553 | case DP_QUERY_PAYLOAD: |
||
554 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); |
||
555 | case DP_REMOTE_DPCD_READ: |
||
556 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); |
||
557 | case DP_REMOTE_DPCD_WRITE: |
||
558 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); |
||
559 | case DP_REMOTE_I2C_READ: |
||
560 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); |
||
561 | case DP_ENUM_PATH_RESOURCES: |
||
562 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); |
||
563 | case DP_ALLOCATE_PAYLOAD: |
||
564 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); |
||
565 | default: |
||
566 | DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); |
||
567 | return false; |
||
568 | } |
||
569 | } |
||
570 | |||
571 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, |
||
572 | struct drm_dp_sideband_msg_req_body *msg) |
||
573 | { |
||
574 | int idx = 1; |
||
575 | |||
576 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
||
577 | idx++; |
||
578 | if (idx > raw->curlen) |
||
579 | goto fail_len; |
||
580 | |||
581 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); |
||
582 | idx += 16; |
||
583 | if (idx > raw->curlen) |
||
584 | goto fail_len; |
||
585 | |||
586 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; |
||
587 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
||
588 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; |
||
589 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; |
||
590 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); |
||
591 | idx++; |
||
592 | return true; |
||
593 | fail_len: |
||
594 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); |
||
595 | return false; |
||
596 | } |
||
597 | |||
598 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, |
||
599 | struct drm_dp_sideband_msg_req_body *msg) |
||
600 | { |
||
601 | int idx = 1; |
||
602 | |||
603 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
||
604 | idx++; |
||
605 | if (idx > raw->curlen) |
||
606 | goto fail_len; |
||
607 | |||
608 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); |
||
609 | idx += 16; |
||
610 | if (idx > raw->curlen) |
||
611 | goto fail_len; |
||
612 | |||
613 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
||
614 | idx++; |
||
615 | return true; |
||
616 | fail_len: |
||
617 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); |
||
618 | return false; |
||
619 | } |
||
620 | |||
621 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, |
||
622 | struct drm_dp_sideband_msg_req_body *msg) |
||
623 | { |
||
624 | memset(msg, 0, sizeof(*msg)); |
||
625 | msg->req_type = (raw->msg[0] & 0x7f); |
||
626 | |||
627 | switch (msg->req_type) { |
||
628 | case DP_CONNECTION_STATUS_NOTIFY: |
||
629 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); |
||
630 | case DP_RESOURCE_STATUS_NOTIFY: |
||
631 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); |
||
632 | default: |
||
633 | DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); |
||
634 | return false; |
||
635 | } |
||
636 | } |
||
637 | |||
638 | static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) |
||
639 | { |
||
640 | struct drm_dp_sideband_msg_req_body req; |
||
641 | |||
642 | req.req_type = DP_REMOTE_DPCD_WRITE; |
||
643 | req.u.dpcd_write.port_number = port_num; |
||
644 | req.u.dpcd_write.dpcd_address = offset; |
||
645 | req.u.dpcd_write.num_bytes = num_bytes; |
||
646 | req.u.dpcd_write.bytes = bytes; |
||
647 | drm_dp_encode_sideband_req(&req, msg); |
||
648 | |||
649 | return 0; |
||
650 | } |
||
651 | |||
652 | static int build_link_address(struct drm_dp_sideband_msg_tx *msg) |
||
653 | { |
||
654 | struct drm_dp_sideband_msg_req_body req; |
||
655 | |||
656 | req.req_type = DP_LINK_ADDRESS; |
||
657 | drm_dp_encode_sideband_req(&req, msg); |
||
658 | return 0; |
||
659 | } |
||
660 | |||
661 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) |
||
662 | { |
||
663 | struct drm_dp_sideband_msg_req_body req; |
||
664 | |||
665 | req.req_type = DP_ENUM_PATH_RESOURCES; |
||
666 | req.u.port_num.port_number = port_num; |
||
667 | drm_dp_encode_sideband_req(&req, msg); |
||
668 | msg->path_msg = true; |
||
669 | return 0; |
||
670 | } |
||
671 | |||
672 | static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, |
||
6937 | serge | 673 | u8 vcpi, uint16_t pbn, |
674 | u8 number_sdp_streams, |
||
675 | u8 *sdp_stream_sink) |
||
5060 | serge | 676 | { |
677 | struct drm_dp_sideband_msg_req_body req; |
||
678 | memset(&req, 0, sizeof(req)); |
||
679 | req.req_type = DP_ALLOCATE_PAYLOAD; |
||
680 | req.u.allocate_payload.port_number = port_num; |
||
681 | req.u.allocate_payload.vcpi = vcpi; |
||
682 | req.u.allocate_payload.pbn = pbn; |
||
6937 | serge | 683 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
684 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, |
||
685 | number_sdp_streams); |
||
5060 | serge | 686 | drm_dp_encode_sideband_req(&req, msg); |
687 | msg->path_msg = true; |
||
688 | return 0; |
||
689 | } |
||
690 | |||
691 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
||
692 | struct drm_dp_vcpi *vcpi) |
||
693 | { |
||
5271 | serge | 694 | int ret, vcpi_ret; |
5060 | serge | 695 | |
696 | mutex_lock(&mgr->payload_lock); |
||
697 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); |
||
698 | if (ret > mgr->max_payloads) { |
||
699 | ret = -EINVAL; |
||
700 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); |
||
701 | goto out_unlock; |
||
702 | } |
||
703 | |||
5271 | serge | 704 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
705 | if (vcpi_ret > mgr->max_payloads) { |
||
706 | ret = -EINVAL; |
||
707 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); |
||
708 | goto out_unlock; |
||
709 | } |
||
710 | |||
5060 | serge | 711 | set_bit(ret, &mgr->payload_mask); |
5271 | serge | 712 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
713 | vcpi->vcpi = vcpi_ret + 1; |
||
5060 | serge | 714 | mgr->proposed_vcpis[ret - 1] = vcpi; |
715 | out_unlock: |
||
716 | mutex_unlock(&mgr->payload_lock); |
||
717 | return ret; |
||
718 | } |
||
719 | |||
720 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
||
5271 | serge | 721 | int vcpi) |
5060 | serge | 722 | { |
5271 | serge | 723 | int i; |
724 | if (vcpi == 0) |
||
5060 | serge | 725 | return; |
726 | |||
727 | mutex_lock(&mgr->payload_lock); |
||
5271 | serge | 728 | DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
729 | clear_bit(vcpi - 1, &mgr->vcpi_mask); |
||
730 | |||
731 | for (i = 0; i < mgr->max_payloads; i++) { |
||
732 | if (mgr->proposed_vcpis[i]) |
||
733 | if (mgr->proposed_vcpis[i]->vcpi == vcpi) { |
||
734 | mgr->proposed_vcpis[i] = NULL; |
||
735 | clear_bit(i + 1, &mgr->payload_mask); |
||
736 | } |
||
737 | } |
||
5060 | serge | 738 | mutex_unlock(&mgr->payload_lock); |
739 | } |
||
740 | |||
741 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, |
||
742 | struct drm_dp_sideband_msg_tx *txmsg) |
||
743 | { |
||
744 | bool ret; |
||
6084 | serge | 745 | |
746 | /* |
||
747 | * All updates to txmsg->state are protected by mgr->qlock, and the two |
||
748 | * cases we check here are terminal states. For those the barriers |
||
749 | * provided by the wake_up/wait_event pair are enough. |
||
750 | */ |
||
5060 | serge | 751 | ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || |
752 | txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); |
||
753 | return ret; |
||
754 | } |
||
755 | |||
756 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, |
||
757 | struct drm_dp_sideband_msg_tx *txmsg) |
||
758 | { |
||
759 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
||
760 | int ret; |
||
761 | |||
762 | ret = wait_event_timeout(mgr->tx_waitq, |
||
763 | check_txmsg_state(mgr, txmsg), |
||
764 | (4 * HZ)); |
||
765 | mutex_lock(&mstb->mgr->qlock); |
||
766 | if (ret > 0) { |
||
767 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { |
||
768 | ret = -EIO; |
||
769 | goto out; |
||
770 | } |
||
771 | } else { |
||
772 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); |
||
773 | |||
774 | /* dump some state */ |
||
775 | ret = -EIO; |
||
776 | |||
777 | /* remove from q */ |
||
778 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || |
||
779 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { |
||
780 | list_del(&txmsg->next); |
||
781 | } |
||
782 | |||
783 | if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || |
||
784 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { |
||
785 | mstb->tx_slots[txmsg->seqno] = NULL; |
||
786 | } |
||
787 | } |
||
788 | out: |
||
789 | mutex_unlock(&mgr->qlock); |
||
790 | |||
791 | return ret; |
||
792 | } |
||
793 | |||
794 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) |
||
795 | { |
||
796 | struct drm_dp_mst_branch *mstb; |
||
797 | |||
798 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); |
||
799 | if (!mstb) |
||
800 | return NULL; |
||
801 | |||
802 | mstb->lct = lct; |
||
803 | if (lct > 1) |
||
804 | memcpy(mstb->rad, rad, lct / 2); |
||
805 | INIT_LIST_HEAD(&mstb->ports); |
||
806 | kref_init(&mstb->kref); |
||
807 | return mstb; |
||
808 | } |
||
809 | |||
6320 | serge | 810 | static void drm_dp_free_mst_port(struct kref *kref); |
811 | |||
812 | static void drm_dp_free_mst_branch_device(struct kref *kref) |
||
813 | { |
||
814 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); |
||
815 | if (mstb->port_parent) { |
||
816 | if (list_empty(&mstb->port_parent->next)) |
||
817 | kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); |
||
818 | } |
||
819 | kfree(mstb); |
||
820 | } |
||
821 | |||
5060 | serge | 822 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
823 | { |
||
824 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); |
||
825 | struct drm_dp_mst_port *port, *tmp; |
||
826 | bool wake_tx = false; |
||
827 | |||
828 | /* |
||
6320 | serge | 829 | * init kref again to be used by ports to remove mst branch when it is |
830 | * not needed anymore |
||
831 | */ |
||
832 | kref_init(kref); |
||
833 | |||
834 | if (mstb->port_parent && list_empty(&mstb->port_parent->next)) |
||
835 | kref_get(&mstb->port_parent->kref); |
||
836 | |||
837 | /* |
||
5060 | serge | 838 | * destroy all ports - don't need lock |
839 | * as there are no more references to the mst branch |
||
840 | * device at this point. |
||
841 | */ |
||
842 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { |
||
843 | list_del(&port->next); |
||
844 | drm_dp_put_port(port); |
||
845 | } |
||
846 | |||
847 | /* drop any tx slots msg */ |
||
848 | mutex_lock(&mstb->mgr->qlock); |
||
849 | if (mstb->tx_slots[0]) { |
||
850 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
851 | mstb->tx_slots[0] = NULL; |
||
852 | wake_tx = true; |
||
853 | } |
||
854 | if (mstb->tx_slots[1]) { |
||
855 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
856 | mstb->tx_slots[1] = NULL; |
||
857 | wake_tx = true; |
||
858 | } |
||
859 | mutex_unlock(&mstb->mgr->qlock); |
||
860 | |||
861 | // if (wake_tx) |
||
862 | // wake_up(&mstb->mgr->tx_waitq); |
||
6320 | serge | 863 | kref_put(kref, drm_dp_free_mst_branch_device); |
5060 | serge | 864 | } |
865 | |||
866 | static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) |
||
867 | { |
||
868 | kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); |
||
869 | } |
||
870 | |||
871 | |||
872 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) |
||
873 | { |
||
5271 | serge | 874 | struct drm_dp_mst_branch *mstb; |
875 | |||
5060 | serge | 876 | switch (old_pdt) { |
877 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
878 | case DP_PEER_DEVICE_SST_SINK: |
||
879 | /* remove i2c over sideband */ |
||
880 | drm_dp_mst_unregister_i2c_bus(&port->aux); |
||
881 | break; |
||
882 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
5271 | serge | 883 | mstb = port->mstb; |
5060 | serge | 884 | port->mstb = NULL; |
5271 | serge | 885 | drm_dp_put_mst_branch_device(mstb); |
5060 | serge | 886 | break; |
887 | } |
||
888 | } |
||
889 | |||
890 | static void drm_dp_destroy_port(struct kref *kref) |
||
891 | { |
||
892 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); |
||
893 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
||
6084 | serge | 894 | |
5060 | serge | 895 | if (!port->input) { |
896 | port->vcpi.num_slots = 0; |
||
5271 | serge | 897 | |
898 | kfree(port->cached_edid); |
||
6084 | serge | 899 | |
900 | /* |
||
901 | * The only time we don't have a connector |
||
902 | * on an output port is if the connector init |
||
903 | * fails. |
||
904 | */ |
||
905 | if (port->connector) { |
||
906 | /* we can't destroy the connector here, as |
||
907 | * we might be holding the mode_config.mutex |
||
908 | * from an EDID retrieval */ |
||
909 | |||
910 | mutex_lock(&mgr->destroy_connector_lock); |
||
6320 | serge | 911 | kref_get(&port->parent->kref); |
6084 | serge | 912 | list_add(&port->next, &mgr->destroy_connector_list); |
913 | mutex_unlock(&mgr->destroy_connector_lock); |
||
914 | // schedule_work(&mgr->destroy_connector_work); |
||
915 | return; |
||
916 | } |
||
917 | /* no need to clean up vcpi |
||
918 | * as if we have no connector we never setup a vcpi */ |
||
5060 | serge | 919 | drm_dp_port_teardown_pdt(port, port->pdt); |
920 | } |
||
921 | kfree(port); |
||
922 | } |
||
923 | |||
924 | static void drm_dp_put_port(struct drm_dp_mst_port *port) |
||
925 | { |
||
926 | kref_put(&port->kref, drm_dp_destroy_port); |
||
927 | } |
||
928 | |||
929 | static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find) |
||
930 | { |
||
931 | struct drm_dp_mst_port *port; |
||
932 | struct drm_dp_mst_branch *rmstb; |
||
933 | if (to_find == mstb) { |
||
934 | kref_get(&mstb->kref); |
||
935 | return mstb; |
||
936 | } |
||
937 | list_for_each_entry(port, &mstb->ports, next) { |
||
938 | if (port->mstb) { |
||
939 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); |
||
940 | if (rmstb) |
||
941 | return rmstb; |
||
942 | } |
||
943 | } |
||
944 | return NULL; |
||
945 | } |
||
946 | |||
947 | static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) |
||
948 | { |
||
949 | struct drm_dp_mst_branch *rmstb = NULL; |
||
950 | mutex_lock(&mgr->lock); |
||
951 | if (mgr->mst_primary) |
||
952 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); |
||
953 | mutex_unlock(&mgr->lock); |
||
954 | return rmstb; |
||
955 | } |
||
956 | |||
957 | static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find) |
||
958 | { |
||
959 | struct drm_dp_mst_port *port, *mport; |
||
960 | |||
961 | list_for_each_entry(port, &mstb->ports, next) { |
||
962 | if (port == to_find) { |
||
963 | kref_get(&port->kref); |
||
964 | return port; |
||
965 | } |
||
966 | if (port->mstb) { |
||
967 | mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); |
||
968 | if (mport) |
||
969 | return mport; |
||
970 | } |
||
971 | } |
||
972 | return NULL; |
||
973 | } |
||
974 | |||
975 | static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
976 | { |
||
977 | struct drm_dp_mst_port *rport = NULL; |
||
978 | mutex_lock(&mgr->lock); |
||
979 | if (mgr->mst_primary) |
||
980 | rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); |
||
981 | mutex_unlock(&mgr->lock); |
||
982 | return rport; |
||
983 | } |
||
984 | |||
985 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) |
||
986 | { |
||
987 | struct drm_dp_mst_port *port; |
||
988 | |||
989 | list_for_each_entry(port, &mstb->ports, next) { |
||
990 | if (port->port_num == port_num) { |
||
991 | kref_get(&port->kref); |
||
992 | return port; |
||
993 | } |
||
994 | } |
||
995 | |||
996 | return NULL; |
||
997 | } |
||
998 | |||
999 | /* |
||
1000 | * calculate a new RAD for this MST branch device |
||
1001 | * if parent has an LCT of 2 then it has 1 nibble of RAD, |
||
1002 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, |
||
1003 | */ |
||
1004 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, |
||
1005 | u8 *rad) |
||
1006 | { |
||
6320 | serge | 1007 | int parent_lct = port->parent->lct; |
5060 | serge | 1008 | int shift = 4; |
6320 | serge | 1009 | int idx = (parent_lct - 1) / 2; |
1010 | if (parent_lct > 1) { |
||
1011 | memcpy(rad, port->parent->rad, idx + 1); |
||
1012 | shift = (parent_lct % 2) ? 4 : 0; |
||
5060 | serge | 1013 | } else |
1014 | rad[0] = 0; |
||
1015 | |||
1016 | rad[idx] |= port->port_num << shift; |
||
6320 | serge | 1017 | return parent_lct + 1; |
5060 | serge | 1018 | } |
1019 | |||
1020 | /* |
||
1021 | * return sends link address for new mstb |
||
1022 | */ |
||
1023 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) |
||
1024 | { |
||
1025 | int ret; |
||
1026 | u8 rad[6], lct; |
||
1027 | bool send_link = false; |
||
1028 | switch (port->pdt) { |
||
1029 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
1030 | case DP_PEER_DEVICE_SST_SINK: |
||
1031 | /* add i2c over sideband */ |
||
1032 | ret = drm_dp_mst_register_i2c_bus(&port->aux); |
||
1033 | break; |
||
1034 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
1035 | lct = drm_dp_calculate_rad(port, rad); |
||
1036 | |||
1037 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); |
||
1038 | port->mstb->mgr = port->mgr; |
||
1039 | port->mstb->port_parent = port; |
||
1040 | |||
1041 | send_link = true; |
||
1042 | break; |
||
1043 | } |
||
1044 | return send_link; |
||
1045 | } |
||
1046 | |||
6320 | serge | 1047 | static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
5060 | serge | 1048 | { |
1049 | int ret; |
||
6320 | serge | 1050 | |
1051 | memcpy(mstb->guid, guid, 16); |
||
1052 | |||
1053 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { |
||
1054 | if (mstb->port_parent) { |
||
1055 | ret = drm_dp_send_dpcd_write( |
||
1056 | mstb->mgr, |
||
1057 | mstb->port_parent, |
||
1058 | DP_GUID, |
||
1059 | 16, |
||
1060 | mstb->guid); |
||
1061 | } else { |
||
1062 | |||
1063 | ret = drm_dp_dpcd_write( |
||
1064 | mstb->mgr->aux, |
||
5060 | serge | 1065 | DP_GUID, |
6320 | serge | 1066 | mstb->guid, |
1067 | 16); |
||
5060 | serge | 1068 | } |
1069 | } |
||
1070 | } |
||
1071 | |||
6084 | serge | 1072 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
1073 | int pnum, |
||
5271 | serge | 1074 | char *proppath, |
1075 | size_t proppath_size) |
||
5060 | serge | 1076 | { |
1077 | int i; |
||
1078 | char temp[8]; |
||
5271 | serge | 1079 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
5060 | serge | 1080 | for (i = 0; i < (mstb->lct - 1); i++) { |
1081 | int shift = (i % 2) ? 0 : 4; |
||
6320 | serge | 1082 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
5271 | serge | 1083 | snprintf(temp, sizeof(temp), "-%d", port_num); |
1084 | strlcat(proppath, temp, proppath_size); |
||
5060 | serge | 1085 | } |
6084 | serge | 1086 | snprintf(temp, sizeof(temp), "-%d", pnum); |
5271 | serge | 1087 | strlcat(proppath, temp, proppath_size); |
5060 | serge | 1088 | } |
1089 | |||
1090 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, |
||
1091 | struct device *dev, |
||
1092 | struct drm_dp_link_addr_reply_port *port_msg) |
||
1093 | { |
||
1094 | struct drm_dp_mst_port *port; |
||
1095 | bool ret; |
||
1096 | bool created = false; |
||
1097 | int old_pdt = 0; |
||
1098 | int old_ddps = 0; |
||
1099 | port = drm_dp_get_port(mstb, port_msg->port_number); |
||
1100 | if (!port) { |
||
1101 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
||
1102 | if (!port) |
||
1103 | return; |
||
1104 | kref_init(&port->kref); |
||
1105 | port->parent = mstb; |
||
1106 | port->port_num = port_msg->port_number; |
||
1107 | port->mgr = mstb->mgr; |
||
1108 | port->aux.name = "DPMST"; |
||
1109 | port->aux.dev = dev; |
||
1110 | created = true; |
||
1111 | } else { |
||
1112 | old_pdt = port->pdt; |
||
1113 | old_ddps = port->ddps; |
||
1114 | } |
||
1115 | |||
1116 | port->pdt = port_msg->peer_device_type; |
||
1117 | port->input = port_msg->input_port; |
||
1118 | port->mcs = port_msg->mcs; |
||
1119 | port->ddps = port_msg->ddps; |
||
1120 | port->ldps = port_msg->legacy_device_plug_status; |
||
1121 | port->dpcd_rev = port_msg->dpcd_revision; |
||
1122 | port->num_sdp_streams = port_msg->num_sdp_streams; |
||
1123 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; |
||
1124 | |||
1125 | /* manage mstb port lists with mgr lock - take a reference |
||
1126 | for this list */ |
||
1127 | if (created) { |
||
1128 | mutex_lock(&mstb->mgr->lock); |
||
1129 | kref_get(&port->kref); |
||
1130 | list_add(&port->next, &mstb->ports); |
||
1131 | mutex_unlock(&mstb->mgr->lock); |
||
1132 | } |
||
1133 | |||
1134 | if (old_ddps != port->ddps) { |
||
1135 | if (port->ddps) { |
||
1136 | if (!port->input) |
||
1137 | drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); |
||
1138 | } else { |
||
1139 | port->available_pbn = 0; |
||
1140 | } |
||
1141 | } |
||
1142 | |||
1143 | if (old_pdt != port->pdt && !port->input) { |
||
1144 | drm_dp_port_teardown_pdt(port, old_pdt); |
||
1145 | |||
1146 | ret = drm_dp_port_setup_pdt(port); |
||
6084 | serge | 1147 | if (ret == true) |
5060 | serge | 1148 | drm_dp_send_link_address(mstb->mgr, port->mstb); |
1149 | } |
||
1150 | |||
1151 | if (created && !port->input) { |
||
1152 | char proppath[255]; |
||
6084 | serge | 1153 | |
1154 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); |
||
5060 | serge | 1155 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); |
6084 | serge | 1156 | if (!port->connector) { |
1157 | /* remove it from the port list */ |
||
1158 | mutex_lock(&mstb->mgr->lock); |
||
1159 | list_del(&port->next); |
||
1160 | mutex_unlock(&mstb->mgr->lock); |
||
1161 | /* drop port list reference */ |
||
1162 | drm_dp_put_port(port); |
||
1163 | goto out; |
||
1164 | } |
||
6937 | serge | 1165 | if (port->port_num >= DP_MST_LOGICAL_PORT_0) { |
5271 | serge | 1166 | port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); |
6084 | serge | 1167 | drm_mode_connector_set_tile_property(port->connector); |
5271 | serge | 1168 | } |
6084 | serge | 1169 | (*mstb->mgr->cbs->register_connector)(port->connector); |
5060 | serge | 1170 | } |
1171 | |||
6084 | serge | 1172 | out: |
5060 | serge | 1173 | /* put reference to this port */ |
1174 | drm_dp_put_port(port); |
||
1175 | } |
||
1176 | |||
1177 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, |
||
1178 | struct drm_dp_connection_status_notify *conn_stat) |
||
1179 | { |
||
1180 | struct drm_dp_mst_port *port; |
||
1181 | int old_pdt; |
||
1182 | int old_ddps; |
||
1183 | bool dowork = false; |
||
1184 | port = drm_dp_get_port(mstb, conn_stat->port_number); |
||
1185 | if (!port) |
||
1186 | return; |
||
1187 | |||
1188 | old_ddps = port->ddps; |
||
1189 | old_pdt = port->pdt; |
||
1190 | port->pdt = conn_stat->peer_device_type; |
||
1191 | port->mcs = conn_stat->message_capability_status; |
||
1192 | port->ldps = conn_stat->legacy_device_plug_status; |
||
1193 | port->ddps = conn_stat->displayport_device_plug_status; |
||
1194 | |||
1195 | if (old_ddps != port->ddps) { |
||
1196 | if (port->ddps) { |
||
1197 | dowork = true; |
||
1198 | } else { |
||
1199 | port->available_pbn = 0; |
||
1200 | } |
||
1201 | } |
||
1202 | if (old_pdt != port->pdt && !port->input) { |
||
1203 | drm_dp_port_teardown_pdt(port, old_pdt); |
||
1204 | |||
1205 | if (drm_dp_port_setup_pdt(port)) |
||
1206 | dowork = true; |
||
1207 | } |
||
1208 | |||
1209 | drm_dp_put_port(port); |
||
1210 | // if (dowork) |
||
1211 | // queue_work(system_long_wq, &mstb->mgr->work); |
||
1212 | |||
1213 | } |
||
1214 | |||
1215 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, |
||
1216 | u8 lct, u8 *rad) |
||
1217 | { |
||
1218 | struct drm_dp_mst_branch *mstb; |
||
1219 | struct drm_dp_mst_port *port; |
||
1220 | int i; |
||
1221 | /* find the port by iterating down */ |
||
6084 | serge | 1222 | |
1223 | mutex_lock(&mgr->lock); |
||
5060 | serge | 1224 | mstb = mgr->mst_primary; |
1225 | |||
1226 | for (i = 0; i < lct - 1; i++) { |
||
1227 | int shift = (i % 2) ? 0 : 4; |
||
6320 | serge | 1228 | int port_num = (rad[i / 2] >> shift) & 0xf; |
5060 | serge | 1229 | |
1230 | list_for_each_entry(port, &mstb->ports, next) { |
||
1231 | if (port->port_num == port_num) { |
||
6084 | serge | 1232 | mstb = port->mstb; |
1233 | if (!mstb) { |
||
5060 | serge | 1234 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
6084 | serge | 1235 | goto out; |
5060 | serge | 1236 | } |
1237 | |||
1238 | break; |
||
1239 | } |
||
1240 | } |
||
1241 | } |
||
1242 | kref_get(&mstb->kref); |
||
6084 | serge | 1243 | out: |
1244 | mutex_unlock(&mgr->lock); |
||
5060 | serge | 1245 | return mstb; |
1246 | } |
||
1247 | |||
6320 | serge | 1248 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
1249 | struct drm_dp_mst_branch *mstb, |
||
1250 | uint8_t *guid) |
||
1251 | { |
||
1252 | struct drm_dp_mst_branch *found_mstb; |
||
1253 | struct drm_dp_mst_port *port; |
||
1254 | |||
1255 | if (memcmp(mstb->guid, guid, 16) == 0) |
||
1256 | return mstb; |
||
1257 | |||
1258 | |||
1259 | list_for_each_entry(port, &mstb->ports, next) { |
||
1260 | if (!port->mstb) |
||
1261 | continue; |
||
1262 | |||
1263 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
||
1264 | |||
1265 | if (found_mstb) |
||
1266 | return found_mstb; |
||
1267 | } |
||
1268 | |||
1269 | return NULL; |
||
1270 | } |
||
1271 | |||
1272 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( |
||
1273 | struct drm_dp_mst_topology_mgr *mgr, |
||
1274 | uint8_t *guid) |
||
1275 | { |
||
1276 | struct drm_dp_mst_branch *mstb; |
||
1277 | |||
1278 | /* find the port by iterating down */ |
||
1279 | mutex_lock(&mgr->lock); |
||
1280 | |||
1281 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
||
1282 | |||
1283 | if (mstb) |
||
1284 | kref_get(&mstb->kref); |
||
1285 | |||
1286 | mutex_unlock(&mgr->lock); |
||
1287 | return mstb; |
||
1288 | } |
||
1289 | |||
5060 | serge | 1290 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1291 | struct drm_dp_mst_branch *mstb) |
||
1292 | { |
||
1293 | struct drm_dp_mst_port *port; |
||
6084 | serge | 1294 | struct drm_dp_mst_branch *mstb_child; |
1295 | if (!mstb->link_address_sent) |
||
1296 | drm_dp_send_link_address(mgr, mstb); |
||
5060 | serge | 1297 | |
1298 | list_for_each_entry(port, &mstb->ports, next) { |
||
1299 | if (port->input) |
||
1300 | continue; |
||
1301 | |||
1302 | if (!port->ddps) |
||
1303 | continue; |
||
1304 | |||
1305 | if (!port->available_pbn) |
||
1306 | drm_dp_send_enum_path_resources(mgr, mstb, port); |
||
1307 | |||
6084 | serge | 1308 | if (port->mstb) { |
1309 | mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); |
||
1310 | if (mstb_child) { |
||
1311 | drm_dp_check_and_send_link_address(mgr, mstb_child); |
||
1312 | drm_dp_put_mst_branch_device(mstb_child); |
||
1313 | } |
||
1314 | } |
||
5060 | serge | 1315 | } |
1316 | } |
||
1317 | |||
1318 | static void drm_dp_mst_link_probe_work(struct work_struct *work) |
||
1319 | { |
||
1320 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); |
||
6084 | serge | 1321 | struct drm_dp_mst_branch *mstb; |
5060 | serge | 1322 | |
6084 | serge | 1323 | mutex_lock(&mgr->lock); |
1324 | mstb = mgr->mst_primary; |
||
1325 | if (mstb) { |
||
1326 | kref_get(&mstb->kref); |
||
1327 | } |
||
1328 | mutex_unlock(&mgr->lock); |
||
1329 | if (mstb) { |
||
1330 | drm_dp_check_and_send_link_address(mgr, mstb); |
||
1331 | drm_dp_put_mst_branch_device(mstb); |
||
1332 | } |
||
5060 | serge | 1333 | } |
1334 | |||
1335 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
||
1336 | u8 *guid) |
||
1337 | { |
||
1338 | static u8 zero_guid[16]; |
||
1339 | |||
1340 | if (!memcmp(guid, zero_guid, 16)) { |
||
1341 | u64 salt = get_jiffies_64(); |
||
1342 | memcpy(&guid[0], &salt, sizeof(u64)); |
||
1343 | memcpy(&guid[8], &salt, sizeof(u64)); |
||
1344 | return false; |
||
1345 | } |
||
1346 | return true; |
||
1347 | } |
||
1348 | |||
1349 | #if 0 |
||
1350 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) |
||
1351 | { |
||
1352 | struct drm_dp_sideband_msg_req_body req; |
||
1353 | |||
1354 | req.req_type = DP_REMOTE_DPCD_READ; |
||
1355 | req.u.dpcd_read.port_number = port_num; |
||
1356 | req.u.dpcd_read.dpcd_address = offset; |
||
1357 | req.u.dpcd_read.num_bytes = num_bytes; |
||
1358 | drm_dp_encode_sideband_req(&req, msg); |
||
1359 | |||
1360 | return 0; |
||
1361 | } |
||
1362 | #endif |
||
1363 | |||
1364 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, |
||
1365 | bool up, u8 *msg, int len) |
||
1366 | { |
||
1367 | int ret; |
||
1368 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; |
||
1369 | int tosend, total, offset; |
||
1370 | int retries = 0; |
||
1371 | |||
1372 | retry: |
||
1373 | total = len; |
||
1374 | offset = 0; |
||
1375 | do { |
||
1376 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); |
||
1377 | |||
1378 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, |
||
1379 | &msg[offset], |
||
1380 | tosend); |
||
1381 | if (ret != tosend) { |
||
1382 | if (ret == -EIO && retries < 5) { |
||
1383 | retries++; |
||
1384 | goto retry; |
||
1385 | } |
||
1386 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); |
||
1387 | |||
1388 | return -EIO; |
||
1389 | } |
||
1390 | offset += tosend; |
||
1391 | total -= tosend; |
||
1392 | } while (total > 0); |
||
1393 | return 0; |
||
1394 | } |
||
1395 | |||
1396 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, |
||
1397 | struct drm_dp_sideband_msg_tx *txmsg) |
||
1398 | { |
||
1399 | struct drm_dp_mst_branch *mstb = txmsg->dst; |
||
6320 | serge | 1400 | u8 req_type; |
5060 | serge | 1401 | |
1402 | /* both msg slots are full */ |
||
1403 | if (txmsg->seqno == -1) { |
||
1404 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { |
||
1405 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); |
||
1406 | return -EAGAIN; |
||
1407 | } |
||
1408 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { |
||
1409 | txmsg->seqno = mstb->last_seqno; |
||
1410 | mstb->last_seqno ^= 1; |
||
1411 | } else if (mstb->tx_slots[0] == NULL) |
||
1412 | txmsg->seqno = 0; |
||
1413 | else |
||
1414 | txmsg->seqno = 1; |
||
1415 | mstb->tx_slots[txmsg->seqno] = txmsg; |
||
1416 | } |
||
6320 | serge | 1417 | |
1418 | req_type = txmsg->msg[0] & 0x7f; |
||
1419 | if (req_type == DP_CONNECTION_STATUS_NOTIFY || |
||
1420 | req_type == DP_RESOURCE_STATUS_NOTIFY) |
||
1421 | hdr->broadcast = 1; |
||
1422 | else |
||
5060 | serge | 1423 | hdr->broadcast = 0; |
1424 | hdr->path_msg = txmsg->path_msg; |
||
1425 | hdr->lct = mstb->lct; |
||
1426 | hdr->lcr = mstb->lct - 1; |
||
1427 | if (mstb->lct > 1) |
||
1428 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); |
||
1429 | hdr->seqno = txmsg->seqno; |
||
1430 | return 0; |
||
1431 | } |
||
1432 | /* |
||
1433 | * process a single block of the next message in the sideband queue |
||
1434 | */ |
||
1435 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
||
1436 | struct drm_dp_sideband_msg_tx *txmsg, |
||
1437 | bool up) |
||
1438 | { |
||
1439 | u8 chunk[48]; |
||
1440 | struct drm_dp_sideband_msg_hdr hdr; |
||
1441 | int len, space, idx, tosend; |
||
1442 | int ret; |
||
1443 | |||
1444 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
||
1445 | |||
1446 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
||
1447 | txmsg->seqno = -1; |
||
1448 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; |
||
1449 | } |
||
1450 | |||
1451 | /* make hdr from dst mst - for replies use seqno |
||
1452 | otherwise assign one */ |
||
1453 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
||
1454 | if (ret < 0) |
||
1455 | return ret; |
||
1456 | |||
1457 | /* amount left to send in this message */ |
||
1458 | len = txmsg->cur_len - txmsg->cur_offset; |
||
1459 | |||
1460 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ |
||
1461 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); |
||
1462 | |||
1463 | tosend = min(len, space); |
||
1464 | if (len == txmsg->cur_len) |
||
1465 | hdr.somt = 1; |
||
1466 | if (space >= len) |
||
1467 | hdr.eomt = 1; |
||
1468 | |||
1469 | |||
1470 | hdr.msg_len = tosend + 1; |
||
1471 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); |
||
1472 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); |
||
1473 | /* add crc at end */ |
||
1474 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); |
||
1475 | idx += tosend + 1; |
||
1476 | |||
1477 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); |
||
1478 | if (ret) { |
||
1479 | DRM_DEBUG_KMS("sideband msg failed to send\n"); |
||
1480 | return ret; |
||
1481 | } |
||
1482 | |||
1483 | txmsg->cur_offset += tosend; |
||
1484 | if (txmsg->cur_offset == txmsg->cur_len) { |
||
1485 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; |
||
1486 | return 1; |
||
1487 | } |
||
1488 | return 0; |
||
1489 | } |
||
1490 | |||
1491 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
||
1492 | { |
||
1493 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1494 | int ret; |
||
1495 | |||
6084 | serge | 1496 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
1497 | |||
5060 | serge | 1498 | /* construct a chunk from the first msg in the tx_msg queue */ |
1499 | if (list_empty(&mgr->tx_msg_downq)) { |
||
1500 | mgr->tx_down_in_progress = false; |
||
1501 | return; |
||
1502 | } |
||
1503 | mgr->tx_down_in_progress = true; |
||
1504 | |||
1505 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); |
||
1506 | ret = process_single_tx_qlock(mgr, txmsg, false); |
||
1507 | if (ret == 1) { |
||
1508 | /* txmsg is sent it should be in the slots now */ |
||
1509 | list_del(&txmsg->next); |
||
1510 | } else if (ret) { |
||
1511 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
||
1512 | list_del(&txmsg->next); |
||
1513 | if (txmsg->seqno != -1) |
||
1514 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
||
1515 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
1516 | // wake_up(&mgr->tx_waitq); |
||
1517 | } |
||
1518 | if (list_empty(&mgr->tx_msg_downq)) { |
||
1519 | mgr->tx_down_in_progress = false; |
||
1520 | return; |
||
1521 | } |
||
1522 | } |
||
1523 | |||
1524 | /* called holding qlock */ |
||
6320 | serge | 1525 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
1526 | struct drm_dp_sideband_msg_tx *txmsg) |
||
5060 | serge | 1527 | { |
1528 | int ret; |
||
1529 | |||
1530 | /* construct a chunk from the first msg in the tx_msg queue */ |
||
6320 | serge | 1531 | ret = process_single_tx_qlock(mgr, txmsg, true); |
5060 | serge | 1532 | |
6320 | serge | 1533 | if (ret != 1) |
5060 | serge | 1534 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
6320 | serge | 1535 | |
1536 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
||
5060 | serge | 1537 | } |
1538 | |||
1539 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
||
1540 | struct drm_dp_sideband_msg_tx *txmsg) |
||
1541 | { |
||
1542 | mutex_lock(&mgr->qlock); |
||
1543 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); |
||
1544 | if (!mgr->tx_down_in_progress) |
||
1545 | process_single_down_tx_qlock(mgr); |
||
1546 | mutex_unlock(&mgr->qlock); |
||
1547 | } |
||
1548 | |||
6084 | serge | 1549 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1550 | struct drm_dp_mst_branch *mstb) |
||
5060 | serge | 1551 | { |
1552 | int len; |
||
1553 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1554 | int ret; |
||
1555 | |||
1556 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1557 | if (!txmsg) |
||
6084 | serge | 1558 | return; |
5060 | serge | 1559 | |
1560 | txmsg->dst = mstb; |
||
1561 | len = build_link_address(txmsg); |
||
1562 | |||
6084 | serge | 1563 | mstb->link_address_sent = true; |
5060 | serge | 1564 | drm_dp_queue_down_tx(mgr, txmsg); |
1565 | |||
1566 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1567 | if (ret > 0) { |
||
1568 | int i; |
||
1569 | |||
1570 | if (txmsg->reply.reply_type == 1) |
||
1571 | DRM_DEBUG_KMS("link address nak received\n"); |
||
1572 | else { |
||
1573 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); |
||
1574 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
||
1575 | DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i, |
||
1576 | txmsg->reply.u.link_addr.ports[i].input_port, |
||
1577 | txmsg->reply.u.link_addr.ports[i].peer_device_type, |
||
1578 | txmsg->reply.u.link_addr.ports[i].port_number, |
||
1579 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, |
||
1580 | txmsg->reply.u.link_addr.ports[i].mcs, |
||
1581 | txmsg->reply.u.link_addr.ports[i].ddps, |
||
1582 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, |
||
1583 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, |
||
1584 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); |
||
1585 | } |
||
6320 | serge | 1586 | |
1587 | drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); |
||
1588 | |||
5060 | serge | 1589 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
1590 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); |
||
1591 | } |
||
1592 | (*mgr->cbs->hotplug)(mgr); |
||
1593 | } |
||
6084 | serge | 1594 | } else { |
1595 | mstb->link_address_sent = false; |
||
5060 | serge | 1596 | DRM_DEBUG_KMS("link address failed %d\n", ret); |
6084 | serge | 1597 | } |
5060 | serge | 1598 | |
1599 | kfree(txmsg); |
||
1600 | } |
||
1601 | |||
1602 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
||
1603 | struct drm_dp_mst_branch *mstb, |
||
1604 | struct drm_dp_mst_port *port) |
||
1605 | { |
||
1606 | int len; |
||
1607 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1608 | int ret; |
||
1609 | |||
1610 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1611 | if (!txmsg) |
||
1612 | return -ENOMEM; |
||
1613 | |||
1614 | txmsg->dst = mstb; |
||
1615 | len = build_enum_path_resources(txmsg, port->port_num); |
||
1616 | |||
1617 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1618 | |||
1619 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1620 | if (ret > 0) { |
||
1621 | if (txmsg->reply.reply_type == 1) |
||
1622 | DRM_DEBUG_KMS("enum path resources nak received\n"); |
||
1623 | else { |
||
1624 | if (port->port_num != txmsg->reply.u.path_resources.port_number) |
||
1625 | DRM_ERROR("got incorrect port in response\n"); |
||
1626 | DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, |
||
1627 | txmsg->reply.u.path_resources.avail_payload_bw_number); |
||
1628 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; |
||
1629 | } |
||
1630 | } |
||
1631 | |||
1632 | kfree(txmsg); |
||
1633 | return 0; |
||
1634 | } |
||
1635 | |||
6320 | serge | 1636 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
1637 | { |
||
1638 | if (!mstb->port_parent) |
||
1639 | return NULL; |
||
1640 | |||
1641 | if (mstb->port_parent->mstb != mstb) |
||
1642 | return mstb->port_parent; |
||
1643 | |||
1644 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); |
||
1645 | } |
||
1646 | |||
1647 | static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, |
||
1648 | struct drm_dp_mst_branch *mstb, |
||
1649 | int *port_num) |
||
1650 | { |
||
1651 | struct drm_dp_mst_branch *rmstb = NULL; |
||
1652 | struct drm_dp_mst_port *found_port; |
||
1653 | mutex_lock(&mgr->lock); |
||
1654 | if (mgr->mst_primary) { |
||
1655 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); |
||
1656 | |||
1657 | if (found_port) { |
||
1658 | rmstb = found_port->parent; |
||
1659 | kref_get(&rmstb->kref); |
||
1660 | *port_num = found_port->port_num; |
||
1661 | } |
||
1662 | } |
||
1663 | mutex_unlock(&mgr->lock); |
||
1664 | return rmstb; |
||
1665 | } |
||
1666 | |||
5060 | serge | 1667 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
1668 | struct drm_dp_mst_port *port, |
||
1669 | int id, |
||
1670 | int pbn) |
||
1671 | { |
||
1672 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1673 | struct drm_dp_mst_branch *mstb; |
||
6320 | serge | 1674 | int len, ret, port_num; |
6937 | serge | 1675 | u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
1676 | int i; |
||
5060 | serge | 1677 | |
6660 | serge | 1678 | port = drm_dp_get_validated_port_ref(mgr, port); |
1679 | if (!port) |
||
1680 | return -EINVAL; |
||
1681 | |||
6320 | serge | 1682 | port_num = port->port_num; |
5060 | serge | 1683 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
6320 | serge | 1684 | if (!mstb) { |
1685 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); |
||
1686 | |||
6660 | serge | 1687 | if (!mstb) { |
1688 | drm_dp_put_port(port); |
||
5060 | serge | 1689 | return -EINVAL; |
6320 | serge | 1690 | } |
6660 | serge | 1691 | } |
5060 | serge | 1692 | |
1693 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1694 | if (!txmsg) { |
||
1695 | ret = -ENOMEM; |
||
1696 | goto fail_put; |
||
1697 | } |
||
1698 | |||
6937 | serge | 1699 | for (i = 0; i < port->num_sdp_streams; i++) |
1700 | sinks[i] = i; |
||
1701 | |||
5060 | serge | 1702 | txmsg->dst = mstb; |
6320 | serge | 1703 | len = build_allocate_payload(txmsg, port_num, |
5060 | serge | 1704 | id, |
6937 | serge | 1705 | pbn, port->num_sdp_streams, sinks); |
5060 | serge | 1706 | |
1707 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1708 | |||
1709 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1710 | if (ret > 0) { |
||
1711 | if (txmsg->reply.reply_type == 1) { |
||
1712 | ret = -EINVAL; |
||
1713 | } else |
||
1714 | ret = 0; |
||
1715 | } |
||
1716 | kfree(txmsg); |
||
1717 | fail_put: |
||
1718 | drm_dp_put_mst_branch_device(mstb); |
||
6660 | serge | 1719 | drm_dp_put_port(port); |
5060 | serge | 1720 | return ret; |
1721 | } |
||
1722 | |||
1723 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
||
1724 | int id, |
||
1725 | struct drm_dp_payload *payload) |
||
1726 | { |
||
1727 | int ret; |
||
1728 | |||
1729 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); |
||
1730 | if (ret < 0) { |
||
1731 | payload->payload_state = 0; |
||
1732 | return ret; |
||
1733 | } |
||
1734 | payload->payload_state = DP_PAYLOAD_LOCAL; |
||
1735 | return 0; |
||
1736 | } |
||
1737 | |||
1738 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
||
1739 | struct drm_dp_mst_port *port, |
||
1740 | int id, |
||
1741 | struct drm_dp_payload *payload) |
||
1742 | { |
||
1743 | int ret; |
||
1744 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); |
||
1745 | if (ret < 0) |
||
1746 | return ret; |
||
1747 | payload->payload_state = DP_PAYLOAD_REMOTE; |
||
1748 | return ret; |
||
1749 | } |
||
1750 | |||
1751 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
||
1752 | struct drm_dp_mst_port *port, |
||
1753 | int id, |
||
1754 | struct drm_dp_payload *payload) |
||
1755 | { |
||
1756 | DRM_DEBUG_KMS("\n"); |
||
1757 | /* its okay for these to fail */ |
||
1758 | if (port) { |
||
1759 | drm_dp_payload_send_msg(mgr, port, id, 0); |
||
1760 | } |
||
1761 | |||
1762 | drm_dp_dpcd_write_payload(mgr, id, payload); |
||
5271 | serge | 1763 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
5060 | serge | 1764 | return 0; |
1765 | } |
||
1766 | |||
1767 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
||
1768 | int id, |
||
1769 | struct drm_dp_payload *payload) |
||
1770 | { |
||
1771 | payload->payload_state = 0; |
||
1772 | return 0; |
||
1773 | } |
||
1774 | |||
1775 | /** |
||
1776 | * drm_dp_update_payload_part1() - Execute payload update part 1 |
||
1777 | * @mgr: manager to use. |
||
1778 | * |
||
1779 | * This iterates over all proposed virtual channels, and tries to |
||
1780 | * allocate space in the link for them. For 0->slots transitions, |
||
1781 | * this step just writes the VCPI to the MST device. For slots->0 |
||
1782 | * transitions, this writes the updated VCPIs and removes the |
||
1783 | * remote VC payloads. |
||
1784 | * |
||
1785 | * after calling this the driver should generate ACT and payload |
||
1786 | * packets. |
||
1787 | */ |
||
1788 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) |
||
1789 | { |
||
5271 | serge | 1790 | int i, j; |
5060 | serge | 1791 | int cur_slots = 1; |
1792 | struct drm_dp_payload req_payload; |
||
1793 | struct drm_dp_mst_port *port; |
||
1794 | |||
1795 | mutex_lock(&mgr->payload_lock); |
||
1796 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1797 | /* solve the current payloads - compare to the hw ones |
||
1798 | - update the hw view */ |
||
1799 | req_payload.start_slot = cur_slots; |
||
1800 | if (mgr->proposed_vcpis[i]) { |
||
1801 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
||
6660 | serge | 1802 | port = drm_dp_get_validated_port_ref(mgr, port); |
1803 | if (!port) { |
||
1804 | mutex_unlock(&mgr->payload_lock); |
||
1805 | return -EINVAL; |
||
1806 | } |
||
5060 | serge | 1807 | req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; |
6937 | serge | 1808 | req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; |
5060 | serge | 1809 | } else { |
1810 | port = NULL; |
||
1811 | req_payload.num_slots = 0; |
||
1812 | } |
||
5271 | serge | 1813 | |
1814 | if (mgr->payloads[i].start_slot != req_payload.start_slot) { |
||
1815 | mgr->payloads[i].start_slot = req_payload.start_slot; |
||
1816 | } |
||
5060 | serge | 1817 | /* work out what is required to happen with this payload */ |
5271 | serge | 1818 | if (mgr->payloads[i].num_slots != req_payload.num_slots) { |
5060 | serge | 1819 | |
1820 | /* need to push an update for this payload */ |
||
1821 | if (req_payload.num_slots) { |
||
5271 | serge | 1822 | drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); |
5060 | serge | 1823 | mgr->payloads[i].num_slots = req_payload.num_slots; |
6937 | serge | 1824 | mgr->payloads[i].vcpi = req_payload.vcpi; |
5060 | serge | 1825 | } else if (mgr->payloads[i].num_slots) { |
1826 | mgr->payloads[i].num_slots = 0; |
||
6937 | serge | 1827 | drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]); |
5060 | serge | 1828 | req_payload.payload_state = mgr->payloads[i].payload_state; |
5271 | serge | 1829 | mgr->payloads[i].start_slot = 0; |
1830 | } |
||
5060 | serge | 1831 | mgr->payloads[i].payload_state = req_payload.payload_state; |
1832 | } |
||
1833 | cur_slots += req_payload.num_slots; |
||
6660 | serge | 1834 | |
1835 | if (port) |
||
1836 | drm_dp_put_port(port); |
||
5060 | serge | 1837 | } |
5271 | serge | 1838 | |
1839 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1840 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
||
1841 | DRM_DEBUG_KMS("removing payload %d\n", i); |
||
1842 | for (j = i; j < mgr->max_payloads - 1; j++) { |
||
1843 | memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); |
||
1844 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; |
||
1845 | if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { |
||
1846 | set_bit(j + 1, &mgr->payload_mask); |
||
1847 | } else { |
||
1848 | clear_bit(j + 1, &mgr->payload_mask); |
||
1849 | } |
||
1850 | } |
||
1851 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); |
||
1852 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; |
||
1853 | clear_bit(mgr->max_payloads, &mgr->payload_mask); |
||
1854 | |||
1855 | } |
||
1856 | } |
||
5060 | serge | 1857 | mutex_unlock(&mgr->payload_lock); |
1858 | |||
1859 | return 0; |
||
1860 | } |
||
1861 | EXPORT_SYMBOL(drm_dp_update_payload_part1); |
||
1862 | |||
1863 | /** |
||
1864 | * drm_dp_update_payload_part2() - Execute payload update part 2 |
||
1865 | * @mgr: manager to use. |
||
1866 | * |
||
1867 | * This iterates over all proposed virtual channels, and tries to |
||
1868 | * allocate space in the link for them. For 0->slots transitions, |
||
1869 | * this step writes the remote VC payload commands. For slots->0 |
||
1870 | * this just resets some internal state. |
||
1871 | */ |
||
1872 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) |
||
1873 | { |
||
1874 | struct drm_dp_mst_port *port; |
||
1875 | int i; |
||
1876 | int ret = 0; |
||
1877 | mutex_lock(&mgr->payload_lock); |
||
1878 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1879 | |||
1880 | if (!mgr->proposed_vcpis[i]) |
||
1881 | continue; |
||
1882 | |||
1883 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
||
1884 | |||
1885 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); |
||
1886 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { |
||
5271 | serge | 1887 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
5060 | serge | 1888 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
5271 | serge | 1889 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
5060 | serge | 1890 | } |
1891 | if (ret) { |
||
1892 | mutex_unlock(&mgr->payload_lock); |
||
1893 | return ret; |
||
1894 | } |
||
1895 | } |
||
1896 | mutex_unlock(&mgr->payload_lock); |
||
1897 | return 0; |
||
1898 | } |
||
1899 | EXPORT_SYMBOL(drm_dp_update_payload_part2); |
||
1900 | |||
1901 | #if 0 /* unused as of yet */ |
||
1902 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
||
1903 | struct drm_dp_mst_port *port, |
||
1904 | int offset, int size) |
||
1905 | { |
||
1906 | int len; |
||
1907 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1908 | |||
1909 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1910 | if (!txmsg) |
||
1911 | return -ENOMEM; |
||
1912 | |||
1913 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); |
||
1914 | txmsg->dst = port->parent; |
||
1915 | |||
1916 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1917 | |||
1918 | return 0; |
||
1919 | } |
||
1920 | #endif |
||
1921 | |||
1922 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
||
1923 | struct drm_dp_mst_port *port, |
||
1924 | int offset, int size, u8 *bytes) |
||
1925 | { |
||
1926 | int len; |
||
1927 | int ret; |
||
1928 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1929 | struct drm_dp_mst_branch *mstb; |
||
1930 | |||
1931 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
1932 | if (!mstb) |
||
1933 | return -EINVAL; |
||
1934 | |||
1935 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1936 | if (!txmsg) { |
||
1937 | ret = -ENOMEM; |
||
1938 | goto fail_put; |
||
1939 | } |
||
1940 | |||
1941 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
||
1942 | txmsg->dst = mstb; |
||
1943 | |||
1944 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1945 | |||
1946 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1947 | if (ret > 0) { |
||
1948 | if (txmsg->reply.reply_type == 1) { |
||
1949 | ret = -EINVAL; |
||
1950 | } else |
||
1951 | ret = 0; |
||
1952 | } |
||
1953 | kfree(txmsg); |
||
1954 | fail_put: |
||
1955 | drm_dp_put_mst_branch_device(mstb); |
||
1956 | return ret; |
||
1957 | } |
||
1958 | |||
1959 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) |
||
1960 | { |
||
1961 | struct drm_dp_sideband_msg_reply_body reply; |
||
1962 | |||
6937 | serge | 1963 | reply.reply_type = 0; |
5060 | serge | 1964 | reply.req_type = req_type; |
1965 | drm_dp_encode_sideband_reply(&reply, msg); |
||
1966 | return 0; |
||
1967 | } |
||
1968 | |||
1969 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, |
||
1970 | struct drm_dp_mst_branch *mstb, |
||
1971 | int req_type, int seqno, bool broadcast) |
||
1972 | { |
||
1973 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1974 | |||
1975 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1976 | if (!txmsg) |
||
1977 | return -ENOMEM; |
||
1978 | |||
1979 | txmsg->dst = mstb; |
||
1980 | txmsg->seqno = seqno; |
||
1981 | drm_dp_encode_up_ack_reply(txmsg, req_type); |
||
1982 | |||
1983 | mutex_lock(&mgr->qlock); |
||
6320 | serge | 1984 | |
1985 | process_single_up_tx_qlock(mgr, txmsg); |
||
1986 | |||
5060 | serge | 1987 | mutex_unlock(&mgr->qlock); |
6320 | serge | 1988 | |
1989 | kfree(txmsg); |
||
5060 | serge | 1990 | return 0; |
1991 | } |
||
1992 | |||
5271 | serge | 1993 | static bool drm_dp_get_vc_payload_bw(int dp_link_bw, |
1994 | int dp_link_count, |
||
1995 | int *out) |
||
5060 | serge | 1996 | { |
1997 | switch (dp_link_bw) { |
||
5271 | serge | 1998 | default: |
1999 | DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", |
||
2000 | dp_link_bw, dp_link_count); |
||
2001 | return false; |
||
2002 | |||
5060 | serge | 2003 | case DP_LINK_BW_1_62: |
5271 | serge | 2004 | *out = 3 * dp_link_count; |
2005 | break; |
||
5060 | serge | 2006 | case DP_LINK_BW_2_7: |
5271 | serge | 2007 | *out = 5 * dp_link_count; |
2008 | break; |
||
5060 | serge | 2009 | case DP_LINK_BW_5_4: |
5271 | serge | 2010 | *out = 10 * dp_link_count; |
2011 | break; |
||
5060 | serge | 2012 | } |
5271 | serge | 2013 | return true; |
5060 | serge | 2014 | } |
2015 | |||
2016 | /** |
||
2017 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager |
||
2018 | * @mgr: manager to set state for |
||
2019 | * @mst_state: true to enable MST on this connector - false to disable. |
||
2020 | * |
||
2021 | * This is called by the driver when it detects an MST capable device plugged |
||
2022 | * into a DP MST capable port, or when a DP MST capable device is unplugged. |
||
2023 | */ |
||
2024 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) |
||
2025 | { |
||
2026 | int ret = 0; |
||
2027 | struct drm_dp_mst_branch *mstb = NULL; |
||
2028 | |||
2029 | mutex_lock(&mgr->lock); |
||
2030 | if (mst_state == mgr->mst_state) |
||
2031 | goto out_unlock; |
||
2032 | |||
2033 | mgr->mst_state = mst_state; |
||
2034 | /* set the device into MST mode */ |
||
2035 | if (mst_state) { |
||
2036 | WARN_ON(mgr->mst_primary); |
||
2037 | |||
2038 | /* get dpcd info */ |
||
2039 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
||
2040 | if (ret != DP_RECEIVER_CAP_SIZE) { |
||
2041 | DRM_DEBUG_KMS("failed to read DPCD\n"); |
||
2042 | goto out_unlock; |
||
2043 | } |
||
2044 | |||
5271 | serge | 2045 | if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
2046 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, |
||
2047 | &mgr->pbn_div)) { |
||
2048 | ret = -EINVAL; |
||
2049 | goto out_unlock; |
||
2050 | } |
||
2051 | |||
5060 | serge | 2052 | mgr->total_pbn = 2560; |
2053 | mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); |
||
2054 | mgr->avail_slots = mgr->total_slots; |
||
2055 | |||
2056 | /* add initial branch device at LCT 1 */ |
||
2057 | mstb = drm_dp_add_mst_branch_device(1, NULL); |
||
2058 | if (mstb == NULL) { |
||
2059 | ret = -ENOMEM; |
||
2060 | goto out_unlock; |
||
2061 | } |
||
2062 | mstb->mgr = mgr; |
||
2063 | |||
2064 | /* give this the main reference */ |
||
2065 | mgr->mst_primary = mstb; |
||
2066 | kref_get(&mgr->mst_primary->kref); |
||
2067 | |||
2068 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
2069 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
||
2070 | if (ret < 0) { |
||
2071 | goto out_unlock; |
||
2072 | } |
||
2073 | |||
6320 | serge | 2074 | { |
2075 | struct drm_dp_payload reset_pay; |
||
2076 | reset_pay.start_slot = 0; |
||
2077 | reset_pay.num_slots = 0x3f; |
||
2078 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); |
||
5060 | serge | 2079 | } |
2080 | |||
2081 | // queue_work(system_long_wq, &mgr->work); |
||
2082 | |||
2083 | ret = 0; |
||
2084 | } else { |
||
2085 | /* disable MST on the device */ |
||
2086 | mstb = mgr->mst_primary; |
||
2087 | mgr->mst_primary = NULL; |
||
2088 | /* this can fail if the device is gone */ |
||
2089 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); |
||
2090 | ret = 0; |
||
2091 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); |
||
2092 | mgr->payload_mask = 0; |
||
2093 | set_bit(0, &mgr->payload_mask); |
||
5271 | serge | 2094 | mgr->vcpi_mask = 0; |
5060 | serge | 2095 | } |
2096 | |||
2097 | out_unlock: |
||
2098 | mutex_unlock(&mgr->lock); |
||
2099 | if (mstb) |
||
2100 | drm_dp_put_mst_branch_device(mstb); |
||
2101 | return ret; |
||
2102 | |||
2103 | } |
||
2104 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); |
||
2105 | |||
2106 | /** |
||
2107 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager |
||
2108 | * @mgr: manager to suspend |
||
2109 | * |
||
2110 | * This function tells the MST device that we can't handle UP messages |
||
2111 | * anymore. This should stop it from sending any since we are suspended. |
||
2112 | */ |
||
2113 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) |
||
2114 | { |
||
2115 | mutex_lock(&mgr->lock); |
||
2116 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
2117 | DP_MST_EN | DP_UPSTREAM_IS_SRC); |
||
2118 | mutex_unlock(&mgr->lock); |
||
2119 | } |
||
2120 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); |
||
2121 | |||
2122 | /** |
||
2123 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager |
||
2124 | * @mgr: manager to resume |
||
2125 | * |
||
2126 | * This will fetch DPCD and see if the device is still there, |
||
2127 | * if it is, it will rewrite the MSTM control bits, and return. |
||
2128 | * |
||
2129 | * if the device fails this returns -1, and the driver should do |
||
2130 | * a full MST reprobe, in case we were undocked. |
||
2131 | */ |
||
2132 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) |
||
2133 | { |
||
2134 | int ret = 0; |
||
2135 | |||
2136 | mutex_lock(&mgr->lock); |
||
2137 | |||
2138 | if (mgr->mst_primary) { |
||
2139 | int sret; |
||
6660 | serge | 2140 | u8 guid[16]; |
2141 | |||
5060 | serge | 2142 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
2143 | if (sret != DP_RECEIVER_CAP_SIZE) { |
||
2144 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
||
2145 | ret = -1; |
||
2146 | goto out_unlock; |
||
2147 | } |
||
2148 | |||
2149 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
2150 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
||
2151 | if (ret < 0) { |
||
2152 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); |
||
2153 | ret = -1; |
||
2154 | goto out_unlock; |
||
2155 | } |
||
6660 | serge | 2156 | |
2157 | /* Some hubs forget their guids after they resume */ |
||
2158 | sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); |
||
2159 | if (sret != 16) { |
||
2160 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
||
2161 | ret = -1; |
||
2162 | goto out_unlock; |
||
2163 | } |
||
2164 | drm_dp_check_mstb_guid(mgr->mst_primary, guid); |
||
2165 | |||
5060 | serge | 2166 | ret = 0; |
2167 | } else |
||
2168 | ret = -1; |
||
2169 | |||
2170 | out_unlock: |
||
2171 | mutex_unlock(&mgr->lock); |
||
2172 | return ret; |
||
2173 | } |
||
2174 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); |
||
2175 | |||
2176 | static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) |
||
2177 | { |
||
2178 | int len; |
||
2179 | u8 replyblock[32]; |
||
2180 | int replylen, origlen, curreply; |
||
2181 | int ret; |
||
2182 | struct drm_dp_sideband_msg_rx *msg; |
||
2183 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; |
||
2184 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; |
||
2185 | |||
2186 | len = min(mgr->max_dpcd_transaction_bytes, 16); |
||
2187 | ret = drm_dp_dpcd_read(mgr->aux, basereg, |
||
2188 | replyblock, len); |
||
2189 | if (ret != len) { |
||
2190 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); |
||
2191 | return; |
||
2192 | } |
||
2193 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); |
||
2194 | if (!ret) { |
||
2195 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); |
||
2196 | return; |
||
2197 | } |
||
2198 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; |
||
2199 | |||
2200 | origlen = replylen; |
||
2201 | replylen -= len; |
||
2202 | curreply = len; |
||
2203 | while (replylen > 0) { |
||
2204 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); |
||
2205 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, |
||
2206 | replyblock, len); |
||
2207 | if (ret != len) { |
||
2208 | DRM_DEBUG_KMS("failed to read a chunk\n"); |
||
2209 | } |
||
2210 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); |
||
2211 | if (ret == false) |
||
2212 | DRM_DEBUG_KMS("failed to build sideband msg\n"); |
||
2213 | curreply += len; |
||
2214 | replylen -= len; |
||
2215 | } |
||
2216 | } |
||
2217 | |||
2218 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) |
||
2219 | { |
||
2220 | int ret = 0; |
||
2221 | |||
2222 | drm_dp_get_one_sb_msg(mgr, false); |
||
2223 | |||
2224 | if (mgr->down_rep_recv.have_eomt) { |
||
2225 | struct drm_dp_sideband_msg_tx *txmsg; |
||
2226 | struct drm_dp_mst_branch *mstb; |
||
2227 | int slot = -1; |
||
2228 | mstb = drm_dp_get_mst_branch_device(mgr, |
||
2229 | mgr->down_rep_recv.initial_hdr.lct, |
||
2230 | mgr->down_rep_recv.initial_hdr.rad); |
||
2231 | |||
2232 | if (!mstb) { |
||
2233 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); |
||
2234 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2235 | return 0; |
||
2236 | } |
||
2237 | |||
2238 | /* find the message */ |
||
2239 | slot = mgr->down_rep_recv.initial_hdr.seqno; |
||
2240 | mutex_lock(&mgr->qlock); |
||
2241 | txmsg = mstb->tx_slots[slot]; |
||
2242 | /* remove from slots */ |
||
2243 | mutex_unlock(&mgr->qlock); |
||
2244 | |||
2245 | if (!txmsg) { |
||
2246 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", |
||
2247 | mstb, |
||
2248 | mgr->down_rep_recv.initial_hdr.seqno, |
||
2249 | mgr->down_rep_recv.initial_hdr.lct, |
||
2250 | mgr->down_rep_recv.initial_hdr.rad[0], |
||
2251 | mgr->down_rep_recv.msg[0]); |
||
2252 | drm_dp_put_mst_branch_device(mstb); |
||
2253 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2254 | return 0; |
||
2255 | } |
||
2256 | |||
2257 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); |
||
2258 | if (txmsg->reply.reply_type == 1) { |
||
2259 | DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); |
||
2260 | } |
||
2261 | |||
2262 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2263 | drm_dp_put_mst_branch_device(mstb); |
||
2264 | |||
2265 | mutex_lock(&mgr->qlock); |
||
2266 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; |
||
2267 | mstb->tx_slots[slot] = NULL; |
||
2268 | mutex_unlock(&mgr->qlock); |
||
2269 | |||
2270 | // wake_up(&mgr->tx_waitq); |
||
2271 | } |
||
2272 | return ret; |
||
2273 | } |
||
2274 | |||
2275 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
||
2276 | { |
||
2277 | int ret = 0; |
||
2278 | drm_dp_get_one_sb_msg(mgr, true); |
||
2279 | |||
2280 | if (mgr->up_req_recv.have_eomt) { |
||
2281 | struct drm_dp_sideband_msg_req_body msg; |
||
6320 | serge | 2282 | struct drm_dp_mst_branch *mstb = NULL; |
5060 | serge | 2283 | bool seqno; |
6320 | serge | 2284 | |
2285 | if (!mgr->up_req_recv.initial_hdr.broadcast) { |
||
5060 | serge | 2286 | mstb = drm_dp_get_mst_branch_device(mgr, |
2287 | mgr->up_req_recv.initial_hdr.lct, |
||
2288 | mgr->up_req_recv.initial_hdr.rad); |
||
2289 | if (!mstb) { |
||
2290 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
||
2291 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2292 | return 0; |
||
2293 | } |
||
6320 | serge | 2294 | } |
5060 | serge | 2295 | |
2296 | seqno = mgr->up_req_recv.initial_hdr.seqno; |
||
2297 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); |
||
2298 | |||
2299 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { |
||
6320 | serge | 2300 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2301 | |||
2302 | if (!mstb) |
||
2303 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); |
||
2304 | |||
2305 | if (!mstb) { |
||
2306 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
||
2307 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2308 | return 0; |
||
2309 | } |
||
2310 | |||
5060 | serge | 2311 | drm_dp_update_port(mstb, &msg.u.conn_stat); |
6320 | serge | 2312 | |
5060 | serge | 2313 | DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type); |
2314 | (*mgr->cbs->hotplug)(mgr); |
||
2315 | |||
2316 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
||
6320 | serge | 2317 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2318 | if (!mstb) |
||
2319 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); |
||
2320 | |||
2321 | if (!mstb) { |
||
2322 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
||
2323 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2324 | return 0; |
||
2325 | } |
||
2326 | |||
5060 | serge | 2327 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); |
2328 | } |
||
2329 | |||
2330 | drm_dp_put_mst_branch_device(mstb); |
||
2331 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2332 | } |
||
2333 | return ret; |
||
2334 | } |
||
2335 | |||
2336 | /** |
||
2337 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify |
||
2338 | * @mgr: manager to notify irq for. |
||
2339 | * @esi: 4 bytes from SINK_COUNT_ESI |
||
5271 | serge | 2340 | * @handled: whether the hpd interrupt was consumed or not |
5060 | serge | 2341 | * |
2342 | * This should be called from the driver when it detects a short IRQ, |
||
2343 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The |
||
2344 | * topology manager will process the sideband messages received as a result |
||
2345 | * of this. |
||
2346 | */ |
||
2347 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) |
||
2348 | { |
||
2349 | int ret = 0; |
||
2350 | int sc; |
||
2351 | *handled = false; |
||
2352 | sc = esi[0] & 0x3f; |
||
2353 | |||
2354 | if (sc != mgr->sink_count) { |
||
2355 | mgr->sink_count = sc; |
||
2356 | *handled = true; |
||
2357 | } |
||
2358 | |||
2359 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { |
||
2360 | ret = drm_dp_mst_handle_down_rep(mgr); |
||
2361 | *handled = true; |
||
2362 | } |
||
2363 | |||
2364 | if (esi[1] & DP_UP_REQ_MSG_RDY) { |
||
2365 | ret |= drm_dp_mst_handle_up_req(mgr); |
||
2366 | *handled = true; |
||
2367 | } |
||
2368 | |||
2369 | drm_dp_mst_kick_tx(mgr); |
||
2370 | return ret; |
||
2371 | } |
||
2372 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); |
||
2373 | |||
2374 | /** |
||
2375 | * drm_dp_mst_detect_port() - get connection status for an MST port |
||
2376 | * @mgr: manager for this port |
||
2377 | * @port: unverified pointer to a port |
||
2378 | * |
||
2379 | * This returns the current connection state for a port. It validates the |
||
2380 | * port pointer still exists so the caller doesn't require a reference |
||
2381 | */ |
||
5271 | serge | 2382 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, |
2383 | struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
5060 | serge | 2384 | { |
2385 | enum drm_connector_status status = connector_status_disconnected; |
||
2386 | |||
2387 | /* we need to search for the port in the mgr in case its gone */ |
||
2388 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2389 | if (!port) |
||
2390 | return connector_status_disconnected; |
||
2391 | |||
2392 | if (!port->ddps) |
||
2393 | goto out; |
||
2394 | |||
2395 | switch (port->pdt) { |
||
2396 | case DP_PEER_DEVICE_NONE: |
||
2397 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
2398 | break; |
||
2399 | |||
2400 | case DP_PEER_DEVICE_SST_SINK: |
||
2401 | status = connector_status_connected; |
||
5271 | serge | 2402 | /* for logical ports - cache the EDID */ |
2403 | if (port->port_num >= 8 && !port->cached_edid) { |
||
2404 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); |
||
2405 | } |
||
5060 | serge | 2406 | break; |
2407 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
2408 | if (port->ldps) |
||
2409 | status = connector_status_connected; |
||
2410 | break; |
||
2411 | } |
||
2412 | out: |
||
2413 | drm_dp_put_port(port); |
||
2414 | return status; |
||
2415 | } |
||
2416 | EXPORT_SYMBOL(drm_dp_mst_detect_port); |
||
2417 | |||
2418 | /** |
||
6937 | serge | 2419 | * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not |
2420 | * @mgr: manager for this port |
||
2421 | * @port: unverified pointer to a port. |
||
2422 | * |
||
2423 | * This returns whether the port supports audio or not. |
||
2424 | */ |
||
2425 | bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, |
||
2426 | struct drm_dp_mst_port *port) |
||
2427 | { |
||
2428 | bool ret = false; |
||
2429 | |||
2430 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2431 | if (!port) |
||
2432 | return ret; |
||
2433 | ret = port->has_audio; |
||
2434 | drm_dp_put_port(port); |
||
2435 | return ret; |
||
2436 | } |
||
2437 | EXPORT_SYMBOL(drm_dp_mst_port_has_audio); |
||
2438 | |||
2439 | /** |
||
5060 | serge | 2440 | * drm_dp_mst_get_edid() - get EDID for an MST port |
2441 | * @connector: toplevel connector to get EDID for |
||
2442 | * @mgr: manager for this port |
||
2443 | * @port: unverified pointer to a port. |
||
2444 | * |
||
2445 | * This returns an EDID for the port connected to a connector, |
||
2446 | * It validates the pointer still exists so the caller doesn't require a |
||
2447 | * reference. |
||
2448 | */ |
||
2449 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2450 | { |
||
2451 | struct edid *edid = NULL; |
||
2452 | |||
2453 | /* we need to search for the port in the mgr in case its gone */ |
||
2454 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2455 | if (!port) |
||
2456 | return NULL; |
||
2457 | |||
5271 | serge | 2458 | if (port->cached_edid) |
2459 | edid = drm_edid_duplicate(port->cached_edid); |
||
6084 | serge | 2460 | else { |
2461 | edid = drm_get_edid(connector, &port->aux.ddc); |
||
2462 | drm_mode_connector_set_tile_property(connector); |
||
2463 | } |
||
6937 | serge | 2464 | port->has_audio = drm_detect_monitor_audio(edid); |
5060 | serge | 2465 | drm_dp_put_port(port); |
2466 | return edid; |
||
2467 | } |
||
2468 | EXPORT_SYMBOL(drm_dp_mst_get_edid); |
||
2469 | |||
2470 | /** |
||
2471 | * drm_dp_find_vcpi_slots() - find slots for this PBN value |
||
2472 | * @mgr: manager to use |
||
2473 | * @pbn: payload bandwidth to convert into slots. |
||
2474 | */ |
||
2475 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, |
||
2476 | int pbn) |
||
2477 | { |
||
2478 | int num_slots; |
||
2479 | |||
2480 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
||
2481 | |||
2482 | if (num_slots > mgr->avail_slots) |
||
2483 | return -ENOSPC; |
||
2484 | return num_slots; |
||
2485 | } |
||
2486 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); |
||
2487 | |||
2488 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
||
2489 | struct drm_dp_vcpi *vcpi, int pbn) |
||
2490 | { |
||
2491 | int num_slots; |
||
2492 | int ret; |
||
2493 | |||
2494 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
||
2495 | |||
2496 | if (num_slots > mgr->avail_slots) |
||
2497 | return -ENOSPC; |
||
2498 | |||
2499 | vcpi->pbn = pbn; |
||
2500 | vcpi->aligned_pbn = num_slots * mgr->pbn_div; |
||
2501 | vcpi->num_slots = num_slots; |
||
2502 | |||
2503 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); |
||
2504 | if (ret < 0) |
||
2505 | return ret; |
||
2506 | return 0; |
||
2507 | } |
||
2508 | |||
2509 | /** |
||
2510 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel |
||
2511 | * @mgr: manager for this port |
||
2512 | * @port: port to allocate a virtual channel for. |
||
2513 | * @pbn: payload bandwidth number to request |
||
2514 | * @slots: returned number of slots for this PBN. |
||
2515 | */ |
||
2516 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) |
||
2517 | { |
||
2518 | int ret; |
||
2519 | |||
2520 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2521 | if (!port) |
||
2522 | return false; |
||
2523 | |||
2524 | if (port->vcpi.vcpi > 0) { |
||
2525 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); |
||
2526 | if (pbn == port->vcpi.pbn) { |
||
2527 | *slots = port->vcpi.num_slots; |
||
6320 | serge | 2528 | drm_dp_put_port(port); |
5060 | serge | 2529 | return true; |
2530 | } |
||
2531 | } |
||
2532 | |||
2533 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); |
||
2534 | if (ret) { |
||
2535 | DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); |
||
2536 | goto out; |
||
2537 | } |
||
2538 | DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); |
||
2539 | *slots = port->vcpi.num_slots; |
||
2540 | |||
2541 | drm_dp_put_port(port); |
||
2542 | return true; |
||
2543 | out: |
||
2544 | return false; |
||
2545 | } |
||
2546 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); |
||
2547 | |||
6084 | serge | 2548 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
2549 | { |
||
2550 | int slots = 0; |
||
2551 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2552 | if (!port) |
||
2553 | return slots; |
||
2554 | |||
2555 | slots = port->vcpi.num_slots; |
||
2556 | drm_dp_put_port(port); |
||
2557 | return slots; |
||
2558 | } |
||
2559 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); |
||
2560 | |||
5060 | serge | 2561 | /** |
2562 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI |
||
2563 | * @mgr: manager for this port |
||
2564 | * @port: unverified pointer to a port. |
||
2565 | * |
||
2566 | * This just resets the number of slots for the ports VCPI for later programming. |
||
2567 | */ |
||
2568 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2569 | { |
||
2570 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2571 | if (!port) |
||
2572 | return; |
||
2573 | port->vcpi.num_slots = 0; |
||
2574 | drm_dp_put_port(port); |
||
2575 | } |
||
2576 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); |
||
2577 | |||
2578 | /** |
||
2579 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI |
||
2580 | * @mgr: manager for this port |
||
2581 | * @port: unverified port to deallocate vcpi for |
||
2582 | */ |
||
2583 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2584 | { |
||
2585 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2586 | if (!port) |
||
2587 | return; |
||
2588 | |||
2589 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); |
||
2590 | port->vcpi.num_slots = 0; |
||
2591 | port->vcpi.pbn = 0; |
||
2592 | port->vcpi.aligned_pbn = 0; |
||
2593 | port->vcpi.vcpi = 0; |
||
2594 | drm_dp_put_port(port); |
||
2595 | } |
||
2596 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); |
||
2597 | |||
2598 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
||
2599 | int id, struct drm_dp_payload *payload) |
||
2600 | { |
||
2601 | u8 payload_alloc[3], status; |
||
2602 | int ret; |
||
2603 | int retries = 0; |
||
2604 | |||
2605 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, |
||
2606 | DP_PAYLOAD_TABLE_UPDATED); |
||
2607 | |||
2608 | payload_alloc[0] = id; |
||
2609 | payload_alloc[1] = payload->start_slot; |
||
2610 | payload_alloc[2] = payload->num_slots; |
||
2611 | |||
2612 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); |
||
2613 | if (ret != 3) { |
||
2614 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); |
||
2615 | goto fail; |
||
2616 | } |
||
2617 | |||
2618 | retry: |
||
2619 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
||
2620 | if (ret < 0) { |
||
2621 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
||
2622 | goto fail; |
||
2623 | } |
||
2624 | |||
2625 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { |
||
2626 | retries++; |
||
2627 | if (retries < 20) { |
||
2628 | usleep_range(10000, 20000); |
||
2629 | goto retry; |
||
2630 | } |
||
2631 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); |
||
2632 | ret = -EINVAL; |
||
2633 | goto fail; |
||
2634 | } |
||
2635 | ret = 0; |
||
2636 | fail: |
||
2637 | return ret; |
||
2638 | } |
||
2639 | |||
2640 | |||
2641 | /** |
||
2642 | * drm_dp_check_act_status() - Check ACT handled status. |
||
2643 | * @mgr: manager to use |
||
2644 | * |
||
2645 | * Check the payload status bits in the DPCD for ACT handled completion. |
||
2646 | */ |
||
2647 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) |
||
2648 | { |
||
2649 | u8 status; |
||
2650 | int ret; |
||
2651 | int count = 0; |
||
2652 | |||
2653 | do { |
||
2654 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
||
2655 | |||
2656 | if (ret < 0) { |
||
2657 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
||
2658 | goto fail; |
||
2659 | } |
||
2660 | |||
2661 | if (status & DP_PAYLOAD_ACT_HANDLED) |
||
2662 | break; |
||
2663 | count++; |
||
2664 | udelay(100); |
||
2665 | |||
2666 | } while (count < 30); |
||
2667 | |||
2668 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { |
||
2669 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); |
||
2670 | ret = -EINVAL; |
||
2671 | goto fail; |
||
2672 | } |
||
2673 | return 0; |
||
2674 | fail: |
||
2675 | return ret; |
||
2676 | } |
||
2677 | EXPORT_SYMBOL(drm_dp_check_act_status); |
||
2678 | |||
2679 | /** |
||
2680 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. |
||
2681 | * @clock: dot clock for the mode |
||
2682 | * @bpp: bpp for the mode. |
||
2683 | * |
||
2684 | * This uses the formula in the spec to calculate the PBN value for a mode. |
||
2685 | */ |
||
2686 | int drm_dp_calc_pbn_mode(int clock, int bpp) |
||
2687 | { |
||
6320 | serge | 2688 | u64 kbps; |
2689 | s64 peak_kbps; |
||
2690 | u32 numerator; |
||
2691 | u32 denominator; |
||
5060 | serge | 2692 | |
6320 | serge | 2693 | kbps = clock * bpp; |
5060 | serge | 2694 | |
6320 | serge | 2695 | /* |
2696 | * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 |
||
2697 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on |
||
2698 | * common multiplier to render an integer PBN for all link rate/lane |
||
2699 | * counts combinations |
||
2700 | * calculate |
||
2701 | * peak_kbps *= (1006/1000) |
||
2702 | * peak_kbps *= (64/54) |
||
2703 | * peak_kbps *= 8 convert to bytes |
||
2704 | */ |
||
5060 | serge | 2705 | |
6320 | serge | 2706 | numerator = 64 * 1006; |
2707 | denominator = 54 * 8 * 1000 * 1000; |
||
5060 | serge | 2708 | |
6320 | serge | 2709 | kbps *= numerator; |
2710 | peak_kbps = drm_fixp_from_fraction(kbps, denominator); |
||
2711 | |||
2712 | return drm_fixp2int_ceil(peak_kbps); |
||
5060 | serge | 2713 | } |
2714 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); |
||
2715 | |||
2716 | static int test_calc_pbn_mode(void) |
||
2717 | { |
||
2718 | int ret; |
||
2719 | ret = drm_dp_calc_pbn_mode(154000, 30); |
||
6320 | serge | 2720 | if (ret != 689) { |
2721 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", |
||
2722 | 154000, 30, 689, ret); |
||
5060 | serge | 2723 | return -EINVAL; |
6320 | serge | 2724 | } |
5060 | serge | 2725 | ret = drm_dp_calc_pbn_mode(234000, 30); |
6320 | serge | 2726 | if (ret != 1047) { |
2727 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", |
||
2728 | 234000, 30, 1047, ret); |
||
5060 | serge | 2729 | return -EINVAL; |
6320 | serge | 2730 | } |
2731 | ret = drm_dp_calc_pbn_mode(297000, 24); |
||
2732 | if (ret != 1063) { |
||
2733 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", |
||
2734 | 297000, 24, 1063, ret); |
||
2735 | return -EINVAL; |
||
2736 | } |
||
5060 | serge | 2737 | return 0; |
2738 | } |
||
2739 | |||
2740 | /* we want to kick the TX after we've ack the up/down IRQs. */ |
||
2741 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) |
||
2742 | { |
||
2743 | // queue_work(system_long_wq, &mgr->tx_work); |
||
2744 | } |
||
2745 | |||
2746 | static void drm_dp_mst_dump_mstb(struct seq_file *m, |
||
2747 | struct drm_dp_mst_branch *mstb) |
||
2748 | { |
||
2749 | struct drm_dp_mst_port *port; |
||
2750 | int tabs = mstb->lct; |
||
2751 | char prefix[10]; |
||
2752 | int i; |
||
2753 | |||
2754 | for (i = 0; i < tabs; i++) |
||
2755 | prefix[i] = '\t'; |
||
2756 | prefix[i] = '\0'; |
||
2757 | |||
2758 | // seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); |
||
2759 | // list_for_each_entry(port, &mstb->ports, next) { |
||
2760 | // seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); |
||
2761 | // if (port->mstb) |
||
2762 | // drm_dp_mst_dump_mstb(m, port->mstb); |
||
2763 | // } |
||
2764 | } |
||
2765 | |||
2766 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
||
2767 | char *buf) |
||
2768 | { |
||
2769 | int ret; |
||
2770 | int i; |
||
2771 | for (i = 0; i < 4; i++) { |
||
2772 | ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); |
||
2773 | if (ret != 16) |
||
2774 | break; |
||
2775 | } |
||
2776 | if (i == 4) |
||
2777 | return true; |
||
2778 | return false; |
||
2779 | } |
||
2780 | |||
2781 | /** |
||
2782 | * drm_dp_mst_dump_topology(): dump topology to seq file. |
||
2783 | * @m: seq_file to dump output to |
||
2784 | * @mgr: manager to dump current topology for. |
||
2785 | * |
||
2786 | * helper to dump MST topology to a seq file for debugfs. |
||
2787 | */ |
||
2788 | void drm_dp_mst_dump_topology(struct seq_file *m, |
||
2789 | struct drm_dp_mst_topology_mgr *mgr) |
||
2790 | { |
||
2791 | int i; |
||
2792 | struct drm_dp_mst_port *port; |
||
2793 | mutex_lock(&mgr->lock); |
||
2794 | if (mgr->mst_primary) |
||
2795 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); |
||
2796 | |||
2797 | /* dump VCPIs */ |
||
2798 | mutex_unlock(&mgr->lock); |
||
2799 | |||
2800 | |||
2801 | |||
2802 | } |
||
2803 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); |
||
2804 | |||
2805 | static void drm_dp_tx_work(struct work_struct *work) |
||
2806 | { |
||
2807 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); |
||
2808 | |||
2809 | mutex_lock(&mgr->qlock); |
||
2810 | if (mgr->tx_down_in_progress) |
||
2811 | process_single_down_tx_qlock(mgr); |
||
2812 | mutex_unlock(&mgr->qlock); |
||
2813 | } |
||
2814 | |||
6320 | serge | 2815 | static void drm_dp_free_mst_port(struct kref *kref) |
2816 | { |
||
2817 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); |
||
2818 | kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); |
||
2819 | kfree(port); |
||
2820 | } |
||
5060 | serge | 2821 | /** |
2822 | * drm_dp_mst_topology_mgr_init - initialise a topology manager |
||
2823 | * @mgr: manager struct to initialise |
||
2824 | * @dev: device providing this structure - for i2c addition. |
||
2825 | * @aux: DP helper aux channel to talk to this device |
||
2826 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit |
||
2827 | * @max_payloads: maximum number of payloads this GPU can source |
||
2828 | * @conn_base_id: the connector object ID the MST device is connected to. |
||
2829 | * |
||
2830 | * Return 0 for success, or negative error code on failure |
||
2831 | */ |
||
2832 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, |
||
2833 | struct device *dev, struct drm_dp_aux *aux, |
||
2834 | int max_dpcd_transaction_bytes, |
||
2835 | int max_payloads, int conn_base_id) |
||
2836 | { |
||
2837 | mutex_init(&mgr->lock); |
||
2838 | mutex_init(&mgr->qlock); |
||
2839 | mutex_init(&mgr->payload_lock); |
||
6084 | serge | 2840 | mutex_init(&mgr->destroy_connector_lock); |
5060 | serge | 2841 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
6084 | serge | 2842 | INIT_LIST_HEAD(&mgr->destroy_connector_list); |
5060 | serge | 2843 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
2844 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); |
||
6088 | serge | 2845 | init_waitqueue_head(&mgr->tx_waitq); |
5060 | serge | 2846 | mgr->dev = dev; |
2847 | mgr->aux = aux; |
||
2848 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; |
||
2849 | mgr->max_payloads = max_payloads; |
||
2850 | mgr->conn_base_id = conn_base_id; |
||
6937 | serge | 2851 | if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || |
2852 | max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) |
||
2853 | return -EINVAL; |
||
5060 | serge | 2854 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
2855 | if (!mgr->payloads) |
||
2856 | return -ENOMEM; |
||
2857 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); |
||
2858 | if (!mgr->proposed_vcpis) |
||
2859 | return -ENOMEM; |
||
2860 | set_bit(0, &mgr->payload_mask); |
||
6937 | serge | 2861 | if (test_calc_pbn_mode() < 0) |
2862 | DRM_ERROR("MST PBN self-test failed\n"); |
||
2863 | |||
5060 | serge | 2864 | return 0; |
2865 | } |
||
2866 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); |
||
2867 | |||
2868 | /** |
||
2869 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. |
||
2870 | * @mgr: manager to destroy |
||
2871 | */ |
||
2872 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) |
||
2873 | { |
||
2874 | mutex_lock(&mgr->payload_lock); |
||
2875 | kfree(mgr->payloads); |
||
2876 | mgr->payloads = NULL; |
||
2877 | kfree(mgr->proposed_vcpis); |
||
2878 | mgr->proposed_vcpis = NULL; |
||
2879 | mutex_unlock(&mgr->payload_lock); |
||
2880 | mgr->dev = NULL; |
||
2881 | mgr->aux = NULL; |
||
2882 | } |
||
2883 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); |
||
2884 | |||
2885 | /* I2C device */ |
||
2886 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, |
||
2887 | int num) |
||
2888 | { |
||
2889 | struct drm_dp_aux *aux = adapter->algo_data; |
||
2890 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); |
||
2891 | struct drm_dp_mst_branch *mstb; |
||
2892 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
||
2893 | unsigned int i; |
||
2894 | bool reading = false; |
||
2895 | struct drm_dp_sideband_msg_req_body msg; |
||
2896 | struct drm_dp_sideband_msg_tx *txmsg = NULL; |
||
2897 | int ret; |
||
2898 | |||
2899 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
2900 | if (!mstb) |
||
2901 | return -EREMOTEIO; |
||
2902 | |||
2903 | /* construct i2c msg */ |
||
2904 | /* see if last msg is a read */ |
||
2905 | if (msgs[num - 1].flags & I2C_M_RD) |
||
2906 | reading = true; |
||
2907 | |||
6084 | serge | 2908 | if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { |
5060 | serge | 2909 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
2910 | ret = -EIO; |
||
2911 | goto out; |
||
2912 | } |
||
2913 | |||
6084 | serge | 2914 | memset(&msg, 0, sizeof(msg)); |
5060 | serge | 2915 | msg.req_type = DP_REMOTE_I2C_READ; |
2916 | msg.u.i2c_read.num_transactions = num - 1; |
||
2917 | msg.u.i2c_read.port_number = port->port_num; |
||
2918 | for (i = 0; i < num - 1; i++) { |
||
2919 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; |
||
2920 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; |
||
2921 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; |
||
2922 | } |
||
2923 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; |
||
2924 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; |
||
2925 | |||
2926 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
2927 | if (!txmsg) { |
||
2928 | ret = -ENOMEM; |
||
2929 | goto out; |
||
2930 | } |
||
2931 | |||
2932 | txmsg->dst = mstb; |
||
2933 | drm_dp_encode_sideband_req(&msg, txmsg); |
||
2934 | |||
2935 | drm_dp_queue_down_tx(mgr, txmsg); |
||
2936 | |||
2937 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
2938 | if (ret > 0) { |
||
2939 | |||
2940 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ |
||
2941 | ret = -EREMOTEIO; |
||
2942 | goto out; |
||
2943 | } |
||
2944 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { |
||
2945 | ret = -EIO; |
||
2946 | goto out; |
||
2947 | } |
||
2948 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); |
||
2949 | ret = num; |
||
2950 | } |
||
2951 | out: |
||
2952 | kfree(txmsg); |
||
2953 | drm_dp_put_mst_branch_device(mstb); |
||
2954 | return ret; |
||
2955 | } |
||
2956 | |||
2957 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) |
||
2958 | { |
||
2959 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | |
||
2960 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | |
||
2961 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | |
||
2962 | I2C_FUNC_10BIT_ADDR; |
||
2963 | } |
||
2964 | |||
2965 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { |
||
2966 | .functionality = drm_dp_mst_i2c_functionality, |
||
2967 | .master_xfer = drm_dp_mst_i2c_xfer, |
||
2968 | }; |
||
2969 | |||
2970 | /** |
||
2971 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX |
||
2972 | * @aux: DisplayPort AUX channel |
||
2973 | * |
||
2974 | * Returns 0 on success or a negative error code on failure. |
||
2975 | */ |
||
2976 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) |
||
2977 | { |
||
2978 | aux->ddc.algo = &drm_dp_mst_i2c_algo; |
||
2979 | aux->ddc.algo_data = aux; |
||
2980 | aux->ddc.retries = 3; |
||
2981 | |||
2982 | aux->ddc.class = I2C_CLASS_DDC; |
||
2983 | aux->ddc.owner = THIS_MODULE; |
||
2984 | aux->ddc.dev.parent = aux->dev; |
||
2985 | |||
2986 | return i2c_add_adapter(&aux->ddc); |
||
2987 | } |
||
2988 | |||
2989 | /** |
||
2990 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter |
||
2991 | * @aux: DisplayPort AUX channel |
||
2992 | */ |
||
2993 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) |
||
2994 | { |
||
2995 | i2c_del_adapter(&aux->ddc); |
||
2996 | }>>>>>>>>>>>>>>>>>>>>>>>>><>>><>><>><>><>><>>><>><>><>>><>><>><>><>><>><>>><>><>>><>><>><>><>><>>><>=><=>=><=>=><=>=><=> |