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