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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 | |||
809 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
||
810 | { |
||
811 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); |
||
812 | struct drm_dp_mst_port *port, *tmp; |
||
813 | bool wake_tx = false; |
||
814 | |||
815 | /* |
||
816 | * destroy all ports - don't need lock |
||
817 | * as there are no more references to the mst branch |
||
818 | * device at this point. |
||
819 | */ |
||
820 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { |
||
821 | list_del(&port->next); |
||
822 | drm_dp_put_port(port); |
||
823 | } |
||
824 | |||
825 | /* drop any tx slots msg */ |
||
826 | mutex_lock(&mstb->mgr->qlock); |
||
827 | if (mstb->tx_slots[0]) { |
||
828 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
829 | mstb->tx_slots[0] = NULL; |
||
830 | wake_tx = true; |
||
831 | } |
||
832 | if (mstb->tx_slots[1]) { |
||
833 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
834 | mstb->tx_slots[1] = NULL; |
||
835 | wake_tx = true; |
||
836 | } |
||
837 | mutex_unlock(&mstb->mgr->qlock); |
||
838 | |||
839 | // if (wake_tx) |
||
840 | // wake_up(&mstb->mgr->tx_waitq); |
||
841 | kfree(mstb); |
||
842 | } |
||
843 | |||
844 | static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) |
||
845 | { |
||
846 | kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); |
||
847 | } |
||
848 | |||
849 | |||
850 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) |
||
851 | { |
||
5271 | serge | 852 | struct drm_dp_mst_branch *mstb; |
853 | |||
5060 | serge | 854 | switch (old_pdt) { |
855 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
856 | case DP_PEER_DEVICE_SST_SINK: |
||
857 | /* remove i2c over sideband */ |
||
858 | drm_dp_mst_unregister_i2c_bus(&port->aux); |
||
859 | break; |
||
860 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
5271 | serge | 861 | mstb = port->mstb; |
5060 | serge | 862 | port->mstb = NULL; |
5271 | serge | 863 | drm_dp_put_mst_branch_device(mstb); |
5060 | serge | 864 | break; |
865 | } |
||
866 | } |
||
867 | |||
868 | static void drm_dp_destroy_port(struct kref *kref) |
||
869 | { |
||
870 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); |
||
871 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
||
6084 | serge | 872 | |
5060 | serge | 873 | if (!port->input) { |
874 | port->vcpi.num_slots = 0; |
||
5271 | serge | 875 | |
876 | kfree(port->cached_edid); |
||
6084 | serge | 877 | |
878 | /* |
||
879 | * The only time we don't have a connector |
||
880 | * on an output port is if the connector init |
||
881 | * fails. |
||
882 | */ |
||
883 | if (port->connector) { |
||
884 | /* we can't destroy the connector here, as |
||
885 | * we might be holding the mode_config.mutex |
||
886 | * from an EDID retrieval */ |
||
887 | |||
888 | mutex_lock(&mgr->destroy_connector_lock); |
||
889 | list_add(&port->next, &mgr->destroy_connector_list); |
||
890 | mutex_unlock(&mgr->destroy_connector_lock); |
||
891 | // schedule_work(&mgr->destroy_connector_work); |
||
892 | return; |
||
893 | } |
||
894 | /* no need to clean up vcpi |
||
895 | * as if we have no connector we never setup a vcpi */ |
||
5060 | serge | 896 | drm_dp_port_teardown_pdt(port, port->pdt); |
897 | } |
||
898 | kfree(port); |
||
899 | } |
||
900 | |||
901 | static void drm_dp_put_port(struct drm_dp_mst_port *port) |
||
902 | { |
||
903 | kref_put(&port->kref, drm_dp_destroy_port); |
||
904 | } |
||
905 | |||
906 | 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) |
||
907 | { |
||
908 | struct drm_dp_mst_port *port; |
||
909 | struct drm_dp_mst_branch *rmstb; |
||
910 | if (to_find == mstb) { |
||
911 | kref_get(&mstb->kref); |
||
912 | return mstb; |
||
913 | } |
||
914 | list_for_each_entry(port, &mstb->ports, next) { |
||
915 | if (port->mstb) { |
||
916 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); |
||
917 | if (rmstb) |
||
918 | return rmstb; |
||
919 | } |
||
920 | } |
||
921 | return NULL; |
||
922 | } |
||
923 | |||
924 | 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) |
||
925 | { |
||
926 | struct drm_dp_mst_branch *rmstb = NULL; |
||
927 | mutex_lock(&mgr->lock); |
||
928 | if (mgr->mst_primary) |
||
929 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); |
||
930 | mutex_unlock(&mgr->lock); |
||
931 | return rmstb; |
||
932 | } |
||
933 | |||
934 | 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) |
||
935 | { |
||
936 | struct drm_dp_mst_port *port, *mport; |
||
937 | |||
938 | list_for_each_entry(port, &mstb->ports, next) { |
||
939 | if (port == to_find) { |
||
940 | kref_get(&port->kref); |
||
941 | return port; |
||
942 | } |
||
943 | if (port->mstb) { |
||
944 | mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); |
||
945 | if (mport) |
||
946 | return mport; |
||
947 | } |
||
948 | } |
||
949 | return NULL; |
||
950 | } |
||
951 | |||
952 | 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) |
||
953 | { |
||
954 | struct drm_dp_mst_port *rport = NULL; |
||
955 | mutex_lock(&mgr->lock); |
||
956 | if (mgr->mst_primary) |
||
957 | rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); |
||
958 | mutex_unlock(&mgr->lock); |
||
959 | return rport; |
||
960 | } |
||
961 | |||
962 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) |
||
963 | { |
||
964 | struct drm_dp_mst_port *port; |
||
965 | |||
966 | list_for_each_entry(port, &mstb->ports, next) { |
||
967 | if (port->port_num == port_num) { |
||
968 | kref_get(&port->kref); |
||
969 | return port; |
||
970 | } |
||
971 | } |
||
972 | |||
973 | return NULL; |
||
974 | } |
||
975 | |||
976 | /* |
||
977 | * calculate a new RAD for this MST branch device |
||
978 | * if parent has an LCT of 2 then it has 1 nibble of RAD, |
||
979 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, |
||
980 | */ |
||
981 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, |
||
982 | u8 *rad) |
||
983 | { |
||
984 | int lct = port->parent->lct; |
||
985 | int shift = 4; |
||
986 | int idx = lct / 2; |
||
987 | if (lct > 1) { |
||
988 | memcpy(rad, port->parent->rad, idx); |
||
989 | shift = (lct % 2) ? 4 : 0; |
||
990 | } else |
||
991 | rad[0] = 0; |
||
992 | |||
993 | rad[idx] |= port->port_num << shift; |
||
994 | return lct + 1; |
||
995 | } |
||
996 | |||
997 | /* |
||
998 | * return sends link address for new mstb |
||
999 | */ |
||
1000 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) |
||
1001 | { |
||
1002 | int ret; |
||
1003 | u8 rad[6], lct; |
||
1004 | bool send_link = false; |
||
1005 | switch (port->pdt) { |
||
1006 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
1007 | case DP_PEER_DEVICE_SST_SINK: |
||
1008 | /* add i2c over sideband */ |
||
1009 | ret = drm_dp_mst_register_i2c_bus(&port->aux); |
||
1010 | break; |
||
1011 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
1012 | lct = drm_dp_calculate_rad(port, rad); |
||
1013 | |||
1014 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); |
||
1015 | port->mstb->mgr = port->mgr; |
||
1016 | port->mstb->port_parent = port; |
||
1017 | |||
1018 | send_link = true; |
||
1019 | break; |
||
1020 | } |
||
1021 | return send_link; |
||
1022 | } |
||
1023 | |||
1024 | static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb, |
||
1025 | struct drm_dp_mst_port *port) |
||
1026 | { |
||
1027 | int ret; |
||
1028 | if (port->dpcd_rev >= 0x12) { |
||
1029 | port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid); |
||
1030 | if (!port->guid_valid) { |
||
1031 | ret = drm_dp_send_dpcd_write(mstb->mgr, |
||
1032 | port, |
||
1033 | DP_GUID, |
||
1034 | 16, port->guid); |
||
1035 | port->guid_valid = true; |
||
1036 | } |
||
1037 | } |
||
1038 | } |
||
1039 | |||
6084 | serge | 1040 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
1041 | int pnum, |
||
5271 | serge | 1042 | char *proppath, |
1043 | size_t proppath_size) |
||
5060 | serge | 1044 | { |
1045 | int i; |
||
1046 | char temp[8]; |
||
5271 | serge | 1047 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
5060 | serge | 1048 | for (i = 0; i < (mstb->lct - 1); i++) { |
1049 | int shift = (i % 2) ? 0 : 4; |
||
1050 | int port_num = mstb->rad[i / 2] >> shift; |
||
5271 | serge | 1051 | snprintf(temp, sizeof(temp), "-%d", port_num); |
1052 | strlcat(proppath, temp, proppath_size); |
||
5060 | serge | 1053 | } |
6084 | serge | 1054 | snprintf(temp, sizeof(temp), "-%d", pnum); |
5271 | serge | 1055 | strlcat(proppath, temp, proppath_size); |
5060 | serge | 1056 | } |
1057 | |||
1058 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, |
||
1059 | struct device *dev, |
||
1060 | struct drm_dp_link_addr_reply_port *port_msg) |
||
1061 | { |
||
1062 | struct drm_dp_mst_port *port; |
||
1063 | bool ret; |
||
1064 | bool created = false; |
||
1065 | int old_pdt = 0; |
||
1066 | int old_ddps = 0; |
||
1067 | port = drm_dp_get_port(mstb, port_msg->port_number); |
||
1068 | if (!port) { |
||
1069 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
||
1070 | if (!port) |
||
1071 | return; |
||
1072 | kref_init(&port->kref); |
||
1073 | port->parent = mstb; |
||
1074 | port->port_num = port_msg->port_number; |
||
1075 | port->mgr = mstb->mgr; |
||
1076 | port->aux.name = "DPMST"; |
||
1077 | port->aux.dev = dev; |
||
1078 | created = true; |
||
1079 | } else { |
||
1080 | old_pdt = port->pdt; |
||
1081 | old_ddps = port->ddps; |
||
1082 | } |
||
1083 | |||
1084 | port->pdt = port_msg->peer_device_type; |
||
1085 | port->input = port_msg->input_port; |
||
1086 | port->mcs = port_msg->mcs; |
||
1087 | port->ddps = port_msg->ddps; |
||
1088 | port->ldps = port_msg->legacy_device_plug_status; |
||
1089 | port->dpcd_rev = port_msg->dpcd_revision; |
||
1090 | port->num_sdp_streams = port_msg->num_sdp_streams; |
||
1091 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; |
||
1092 | memcpy(port->guid, port_msg->peer_guid, 16); |
||
1093 | |||
1094 | /* manage mstb port lists with mgr lock - take a reference |
||
1095 | for this list */ |
||
1096 | if (created) { |
||
1097 | mutex_lock(&mstb->mgr->lock); |
||
1098 | kref_get(&port->kref); |
||
1099 | list_add(&port->next, &mstb->ports); |
||
1100 | mutex_unlock(&mstb->mgr->lock); |
||
1101 | } |
||
1102 | |||
1103 | if (old_ddps != port->ddps) { |
||
1104 | if (port->ddps) { |
||
1105 | drm_dp_check_port_guid(mstb, port); |
||
1106 | if (!port->input) |
||
1107 | drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); |
||
1108 | } else { |
||
1109 | port->guid_valid = false; |
||
1110 | port->available_pbn = 0; |
||
1111 | } |
||
1112 | } |
||
1113 | |||
1114 | if (old_pdt != port->pdt && !port->input) { |
||
1115 | drm_dp_port_teardown_pdt(port, old_pdt); |
||
1116 | |||
1117 | ret = drm_dp_port_setup_pdt(port); |
||
6084 | serge | 1118 | if (ret == true) |
5060 | serge | 1119 | drm_dp_send_link_address(mstb->mgr, port->mstb); |
1120 | } |
||
1121 | |||
1122 | if (created && !port->input) { |
||
1123 | char proppath[255]; |
||
6084 | serge | 1124 | |
1125 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); |
||
5060 | serge | 1126 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); |
6084 | serge | 1127 | if (!port->connector) { |
1128 | /* remove it from the port list */ |
||
1129 | mutex_lock(&mstb->mgr->lock); |
||
1130 | list_del(&port->next); |
||
1131 | mutex_unlock(&mstb->mgr->lock); |
||
1132 | /* drop port list reference */ |
||
1133 | drm_dp_put_port(port); |
||
1134 | goto out; |
||
1135 | } |
||
1136 | if (port->port_num >= DP_MST_LOGICAL_PORT_0) { |
||
5271 | serge | 1137 | port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); |
6084 | serge | 1138 | drm_mode_connector_set_tile_property(port->connector); |
5271 | serge | 1139 | } |
6084 | serge | 1140 | (*mstb->mgr->cbs->register_connector)(port->connector); |
5060 | serge | 1141 | } |
1142 | |||
6084 | serge | 1143 | out: |
5060 | serge | 1144 | /* put reference to this port */ |
1145 | drm_dp_put_port(port); |
||
1146 | } |
||
1147 | |||
1148 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, |
||
1149 | struct drm_dp_connection_status_notify *conn_stat) |
||
1150 | { |
||
1151 | struct drm_dp_mst_port *port; |
||
1152 | int old_pdt; |
||
1153 | int old_ddps; |
||
1154 | bool dowork = false; |
||
1155 | port = drm_dp_get_port(mstb, conn_stat->port_number); |
||
1156 | if (!port) |
||
1157 | return; |
||
1158 | |||
1159 | old_ddps = port->ddps; |
||
1160 | old_pdt = port->pdt; |
||
1161 | port->pdt = conn_stat->peer_device_type; |
||
1162 | port->mcs = conn_stat->message_capability_status; |
||
1163 | port->ldps = conn_stat->legacy_device_plug_status; |
||
1164 | port->ddps = conn_stat->displayport_device_plug_status; |
||
1165 | |||
1166 | if (old_ddps != port->ddps) { |
||
1167 | if (port->ddps) { |
||
1168 | drm_dp_check_port_guid(mstb, port); |
||
1169 | dowork = true; |
||
1170 | } else { |
||
1171 | port->guid_valid = false; |
||
1172 | port->available_pbn = 0; |
||
1173 | } |
||
1174 | } |
||
1175 | if (old_pdt != port->pdt && !port->input) { |
||
1176 | drm_dp_port_teardown_pdt(port, old_pdt); |
||
1177 | |||
1178 | if (drm_dp_port_setup_pdt(port)) |
||
1179 | dowork = true; |
||
1180 | } |
||
1181 | |||
1182 | drm_dp_put_port(port); |
||
1183 | // if (dowork) |
||
1184 | // queue_work(system_long_wq, &mstb->mgr->work); |
||
1185 | |||
1186 | } |
||
1187 | |||
1188 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, |
||
1189 | u8 lct, u8 *rad) |
||
1190 | { |
||
1191 | struct drm_dp_mst_branch *mstb; |
||
1192 | struct drm_dp_mst_port *port; |
||
1193 | int i; |
||
1194 | /* find the port by iterating down */ |
||
6084 | serge | 1195 | |
1196 | mutex_lock(&mgr->lock); |
||
5060 | serge | 1197 | mstb = mgr->mst_primary; |
1198 | |||
1199 | for (i = 0; i < lct - 1; i++) { |
||
1200 | int shift = (i % 2) ? 0 : 4; |
||
1201 | int port_num = rad[i / 2] >> shift; |
||
1202 | |||
1203 | list_for_each_entry(port, &mstb->ports, next) { |
||
1204 | if (port->port_num == port_num) { |
||
6084 | serge | 1205 | mstb = port->mstb; |
1206 | if (!mstb) { |
||
5060 | serge | 1207 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
6084 | serge | 1208 | goto out; |
5060 | serge | 1209 | } |
1210 | |||
1211 | break; |
||
1212 | } |
||
1213 | } |
||
1214 | } |
||
1215 | kref_get(&mstb->kref); |
||
6084 | serge | 1216 | out: |
1217 | mutex_unlock(&mgr->lock); |
||
5060 | serge | 1218 | return mstb; |
1219 | } |
||
1220 | |||
1221 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
||
1222 | struct drm_dp_mst_branch *mstb) |
||
1223 | { |
||
1224 | struct drm_dp_mst_port *port; |
||
6084 | serge | 1225 | struct drm_dp_mst_branch *mstb_child; |
1226 | if (!mstb->link_address_sent) |
||
1227 | drm_dp_send_link_address(mgr, mstb); |
||
5060 | serge | 1228 | |
1229 | list_for_each_entry(port, &mstb->ports, next) { |
||
1230 | if (port->input) |
||
1231 | continue; |
||
1232 | |||
1233 | if (!port->ddps) |
||
1234 | continue; |
||
1235 | |||
1236 | if (!port->available_pbn) |
||
1237 | drm_dp_send_enum_path_resources(mgr, mstb, port); |
||
1238 | |||
6084 | serge | 1239 | if (port->mstb) { |
1240 | mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); |
||
1241 | if (mstb_child) { |
||
1242 | drm_dp_check_and_send_link_address(mgr, mstb_child); |
||
1243 | drm_dp_put_mst_branch_device(mstb_child); |
||
1244 | } |
||
1245 | } |
||
5060 | serge | 1246 | } |
1247 | } |
||
1248 | |||
1249 | static void drm_dp_mst_link_probe_work(struct work_struct *work) |
||
1250 | { |
||
1251 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); |
||
6084 | serge | 1252 | struct drm_dp_mst_branch *mstb; |
5060 | serge | 1253 | |
6084 | serge | 1254 | mutex_lock(&mgr->lock); |
1255 | mstb = mgr->mst_primary; |
||
1256 | if (mstb) { |
||
1257 | kref_get(&mstb->kref); |
||
1258 | } |
||
1259 | mutex_unlock(&mgr->lock); |
||
1260 | if (mstb) { |
||
1261 | drm_dp_check_and_send_link_address(mgr, mstb); |
||
1262 | drm_dp_put_mst_branch_device(mstb); |
||
1263 | } |
||
5060 | serge | 1264 | } |
1265 | |||
1266 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
||
1267 | u8 *guid) |
||
1268 | { |
||
1269 | static u8 zero_guid[16]; |
||
1270 | |||
1271 | if (!memcmp(guid, zero_guid, 16)) { |
||
1272 | u64 salt = get_jiffies_64(); |
||
1273 | memcpy(&guid[0], &salt, sizeof(u64)); |
||
1274 | memcpy(&guid[8], &salt, sizeof(u64)); |
||
1275 | return false; |
||
1276 | } |
||
1277 | return true; |
||
1278 | } |
||
1279 | |||
1280 | #if 0 |
||
1281 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) |
||
1282 | { |
||
1283 | struct drm_dp_sideband_msg_req_body req; |
||
1284 | |||
1285 | req.req_type = DP_REMOTE_DPCD_READ; |
||
1286 | req.u.dpcd_read.port_number = port_num; |
||
1287 | req.u.dpcd_read.dpcd_address = offset; |
||
1288 | req.u.dpcd_read.num_bytes = num_bytes; |
||
1289 | drm_dp_encode_sideband_req(&req, msg); |
||
1290 | |||
1291 | return 0; |
||
1292 | } |
||
1293 | #endif |
||
1294 | |||
1295 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, |
||
1296 | bool up, u8 *msg, int len) |
||
1297 | { |
||
1298 | int ret; |
||
1299 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; |
||
1300 | int tosend, total, offset; |
||
1301 | int retries = 0; |
||
1302 | |||
1303 | retry: |
||
1304 | total = len; |
||
1305 | offset = 0; |
||
1306 | do { |
||
1307 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); |
||
1308 | |||
1309 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, |
||
1310 | &msg[offset], |
||
1311 | tosend); |
||
1312 | if (ret != tosend) { |
||
1313 | if (ret == -EIO && retries < 5) { |
||
1314 | retries++; |
||
1315 | goto retry; |
||
1316 | } |
||
1317 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); |
||
1318 | |||
1319 | return -EIO; |
||
1320 | } |
||
1321 | offset += tosend; |
||
1322 | total -= tosend; |
||
1323 | } while (total > 0); |
||
1324 | return 0; |
||
1325 | } |
||
1326 | |||
1327 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, |
||
1328 | struct drm_dp_sideband_msg_tx *txmsg) |
||
1329 | { |
||
1330 | struct drm_dp_mst_branch *mstb = txmsg->dst; |
||
1331 | |||
1332 | /* both msg slots are full */ |
||
1333 | if (txmsg->seqno == -1) { |
||
1334 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { |
||
1335 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); |
||
1336 | return -EAGAIN; |
||
1337 | } |
||
1338 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { |
||
1339 | txmsg->seqno = mstb->last_seqno; |
||
1340 | mstb->last_seqno ^= 1; |
||
1341 | } else if (mstb->tx_slots[0] == NULL) |
||
1342 | txmsg->seqno = 0; |
||
1343 | else |
||
1344 | txmsg->seqno = 1; |
||
1345 | mstb->tx_slots[txmsg->seqno] = txmsg; |
||
1346 | } |
||
1347 | hdr->broadcast = 0; |
||
1348 | hdr->path_msg = txmsg->path_msg; |
||
1349 | hdr->lct = mstb->lct; |
||
1350 | hdr->lcr = mstb->lct - 1; |
||
1351 | if (mstb->lct > 1) |
||
1352 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); |
||
1353 | hdr->seqno = txmsg->seqno; |
||
1354 | return 0; |
||
1355 | } |
||
1356 | /* |
||
1357 | * process a single block of the next message in the sideband queue |
||
1358 | */ |
||
1359 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
||
1360 | struct drm_dp_sideband_msg_tx *txmsg, |
||
1361 | bool up) |
||
1362 | { |
||
1363 | u8 chunk[48]; |
||
1364 | struct drm_dp_sideband_msg_hdr hdr; |
||
1365 | int len, space, idx, tosend; |
||
1366 | int ret; |
||
1367 | |||
1368 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
||
1369 | |||
1370 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
||
1371 | txmsg->seqno = -1; |
||
1372 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; |
||
1373 | } |
||
1374 | |||
1375 | /* make hdr from dst mst - for replies use seqno |
||
1376 | otherwise assign one */ |
||
1377 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
||
1378 | if (ret < 0) |
||
1379 | return ret; |
||
1380 | |||
1381 | /* amount left to send in this message */ |
||
1382 | len = txmsg->cur_len - txmsg->cur_offset; |
||
1383 | |||
1384 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ |
||
1385 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); |
||
1386 | |||
1387 | tosend = min(len, space); |
||
1388 | if (len == txmsg->cur_len) |
||
1389 | hdr.somt = 1; |
||
1390 | if (space >= len) |
||
1391 | hdr.eomt = 1; |
||
1392 | |||
1393 | |||
1394 | hdr.msg_len = tosend + 1; |
||
1395 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); |
||
1396 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); |
||
1397 | /* add crc at end */ |
||
1398 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); |
||
1399 | idx += tosend + 1; |
||
1400 | |||
1401 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); |
||
1402 | if (ret) { |
||
1403 | DRM_DEBUG_KMS("sideband msg failed to send\n"); |
||
1404 | return ret; |
||
1405 | } |
||
1406 | |||
1407 | txmsg->cur_offset += tosend; |
||
1408 | if (txmsg->cur_offset == txmsg->cur_len) { |
||
1409 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; |
||
1410 | return 1; |
||
1411 | } |
||
1412 | return 0; |
||
1413 | } |
||
1414 | |||
1415 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
||
1416 | { |
||
1417 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1418 | int ret; |
||
1419 | |||
6084 | serge | 1420 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
1421 | |||
5060 | serge | 1422 | /* construct a chunk from the first msg in the tx_msg queue */ |
1423 | if (list_empty(&mgr->tx_msg_downq)) { |
||
1424 | mgr->tx_down_in_progress = false; |
||
1425 | return; |
||
1426 | } |
||
1427 | mgr->tx_down_in_progress = true; |
||
1428 | |||
1429 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); |
||
1430 | ret = process_single_tx_qlock(mgr, txmsg, false); |
||
1431 | if (ret == 1) { |
||
1432 | /* txmsg is sent it should be in the slots now */ |
||
1433 | list_del(&txmsg->next); |
||
1434 | } else if (ret) { |
||
1435 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
||
1436 | list_del(&txmsg->next); |
||
1437 | if (txmsg->seqno != -1) |
||
1438 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
||
1439 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
1440 | // wake_up(&mgr->tx_waitq); |
||
1441 | } |
||
1442 | if (list_empty(&mgr->tx_msg_downq)) { |
||
1443 | mgr->tx_down_in_progress = false; |
||
1444 | return; |
||
1445 | } |
||
1446 | } |
||
1447 | |||
1448 | /* called holding qlock */ |
||
1449 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
||
1450 | { |
||
1451 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1452 | int ret; |
||
1453 | |||
1454 | /* construct a chunk from the first msg in the tx_msg queue */ |
||
1455 | if (list_empty(&mgr->tx_msg_upq)) { |
||
1456 | mgr->tx_up_in_progress = false; |
||
1457 | return; |
||
1458 | } |
||
1459 | |||
1460 | txmsg = list_first_entry(&mgr->tx_msg_upq, struct drm_dp_sideband_msg_tx, next); |
||
1461 | ret = process_single_tx_qlock(mgr, txmsg, true); |
||
1462 | if (ret == 1) { |
||
1463 | /* up txmsgs aren't put in slots - so free after we send it */ |
||
1464 | list_del(&txmsg->next); |
||
1465 | kfree(txmsg); |
||
1466 | } else if (ret) |
||
1467 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
||
1468 | mgr->tx_up_in_progress = true; |
||
1469 | } |
||
1470 | |||
1471 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
||
1472 | struct drm_dp_sideband_msg_tx *txmsg) |
||
1473 | { |
||
1474 | mutex_lock(&mgr->qlock); |
||
1475 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); |
||
1476 | if (!mgr->tx_down_in_progress) |
||
1477 | process_single_down_tx_qlock(mgr); |
||
1478 | mutex_unlock(&mgr->qlock); |
||
1479 | } |
||
1480 | |||
6084 | serge | 1481 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1482 | struct drm_dp_mst_branch *mstb) |
||
5060 | serge | 1483 | { |
1484 | int len; |
||
1485 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1486 | int ret; |
||
1487 | |||
1488 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1489 | if (!txmsg) |
||
6084 | serge | 1490 | return; |
5060 | serge | 1491 | |
1492 | txmsg->dst = mstb; |
||
1493 | len = build_link_address(txmsg); |
||
1494 | |||
6084 | serge | 1495 | mstb->link_address_sent = true; |
5060 | serge | 1496 | drm_dp_queue_down_tx(mgr, txmsg); |
1497 | |||
1498 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1499 | if (ret > 0) { |
||
1500 | int i; |
||
1501 | |||
1502 | if (txmsg->reply.reply_type == 1) |
||
1503 | DRM_DEBUG_KMS("link address nak received\n"); |
||
1504 | else { |
||
1505 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); |
||
1506 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
||
1507 | 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, |
||
1508 | txmsg->reply.u.link_addr.ports[i].input_port, |
||
1509 | txmsg->reply.u.link_addr.ports[i].peer_device_type, |
||
1510 | txmsg->reply.u.link_addr.ports[i].port_number, |
||
1511 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, |
||
1512 | txmsg->reply.u.link_addr.ports[i].mcs, |
||
1513 | txmsg->reply.u.link_addr.ports[i].ddps, |
||
1514 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, |
||
1515 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, |
||
1516 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); |
||
1517 | } |
||
1518 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
||
1519 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); |
||
1520 | } |
||
1521 | (*mgr->cbs->hotplug)(mgr); |
||
1522 | } |
||
6084 | serge | 1523 | } else { |
1524 | mstb->link_address_sent = false; |
||
5060 | serge | 1525 | DRM_DEBUG_KMS("link address failed %d\n", ret); |
6084 | serge | 1526 | } |
5060 | serge | 1527 | |
1528 | kfree(txmsg); |
||
1529 | } |
||
1530 | |||
1531 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
||
1532 | struct drm_dp_mst_branch *mstb, |
||
1533 | struct drm_dp_mst_port *port) |
||
1534 | { |
||
1535 | int len; |
||
1536 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1537 | int ret; |
||
1538 | |||
1539 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1540 | if (!txmsg) |
||
1541 | return -ENOMEM; |
||
1542 | |||
1543 | txmsg->dst = mstb; |
||
1544 | len = build_enum_path_resources(txmsg, port->port_num); |
||
1545 | |||
1546 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1547 | |||
1548 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1549 | if (ret > 0) { |
||
1550 | if (txmsg->reply.reply_type == 1) |
||
1551 | DRM_DEBUG_KMS("enum path resources nak received\n"); |
||
1552 | else { |
||
1553 | if (port->port_num != txmsg->reply.u.path_resources.port_number) |
||
1554 | DRM_ERROR("got incorrect port in response\n"); |
||
1555 | 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, |
||
1556 | txmsg->reply.u.path_resources.avail_payload_bw_number); |
||
1557 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; |
||
1558 | } |
||
1559 | } |
||
1560 | |||
1561 | kfree(txmsg); |
||
1562 | return 0; |
||
1563 | } |
||
1564 | |||
1565 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
||
1566 | struct drm_dp_mst_port *port, |
||
1567 | int id, |
||
1568 | int pbn) |
||
1569 | { |
||
1570 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1571 | struct drm_dp_mst_branch *mstb; |
||
1572 | int len, ret; |
||
1573 | |||
1574 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
1575 | if (!mstb) |
||
1576 | return -EINVAL; |
||
1577 | |||
1578 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1579 | if (!txmsg) { |
||
1580 | ret = -ENOMEM; |
||
1581 | goto fail_put; |
||
1582 | } |
||
1583 | |||
1584 | txmsg->dst = mstb; |
||
1585 | len = build_allocate_payload(txmsg, port->port_num, |
||
1586 | id, |
||
1587 | pbn); |
||
1588 | |||
1589 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1590 | |||
1591 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1592 | if (ret > 0) { |
||
1593 | if (txmsg->reply.reply_type == 1) { |
||
1594 | ret = -EINVAL; |
||
1595 | } else |
||
1596 | ret = 0; |
||
1597 | } |
||
1598 | kfree(txmsg); |
||
1599 | fail_put: |
||
1600 | drm_dp_put_mst_branch_device(mstb); |
||
1601 | return ret; |
||
1602 | } |
||
1603 | |||
1604 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
||
1605 | int id, |
||
1606 | struct drm_dp_payload *payload) |
||
1607 | { |
||
1608 | int ret; |
||
1609 | |||
1610 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); |
||
1611 | if (ret < 0) { |
||
1612 | payload->payload_state = 0; |
||
1613 | return ret; |
||
1614 | } |
||
1615 | payload->payload_state = DP_PAYLOAD_LOCAL; |
||
1616 | return 0; |
||
1617 | } |
||
1618 | |||
1619 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
||
1620 | struct drm_dp_mst_port *port, |
||
1621 | int id, |
||
1622 | struct drm_dp_payload *payload) |
||
1623 | { |
||
1624 | int ret; |
||
1625 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); |
||
1626 | if (ret < 0) |
||
1627 | return ret; |
||
1628 | payload->payload_state = DP_PAYLOAD_REMOTE; |
||
1629 | return ret; |
||
1630 | } |
||
1631 | |||
1632 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
||
1633 | struct drm_dp_mst_port *port, |
||
1634 | int id, |
||
1635 | struct drm_dp_payload *payload) |
||
1636 | { |
||
1637 | DRM_DEBUG_KMS("\n"); |
||
1638 | /* its okay for these to fail */ |
||
1639 | if (port) { |
||
1640 | drm_dp_payload_send_msg(mgr, port, id, 0); |
||
1641 | } |
||
1642 | |||
1643 | drm_dp_dpcd_write_payload(mgr, id, payload); |
||
5271 | serge | 1644 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
5060 | serge | 1645 | return 0; |
1646 | } |
||
1647 | |||
1648 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
||
1649 | int id, |
||
1650 | struct drm_dp_payload *payload) |
||
1651 | { |
||
1652 | payload->payload_state = 0; |
||
1653 | return 0; |
||
1654 | } |
||
1655 | |||
1656 | /** |
||
1657 | * drm_dp_update_payload_part1() - Execute payload update part 1 |
||
1658 | * @mgr: manager to use. |
||
1659 | * |
||
1660 | * This iterates over all proposed virtual channels, and tries to |
||
1661 | * allocate space in the link for them. For 0->slots transitions, |
||
1662 | * this step just writes the VCPI to the MST device. For slots->0 |
||
1663 | * transitions, this writes the updated VCPIs and removes the |
||
1664 | * remote VC payloads. |
||
1665 | * |
||
1666 | * after calling this the driver should generate ACT and payload |
||
1667 | * packets. |
||
1668 | */ |
||
1669 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) |
||
1670 | { |
||
5271 | serge | 1671 | int i, j; |
5060 | serge | 1672 | int cur_slots = 1; |
1673 | struct drm_dp_payload req_payload; |
||
1674 | struct drm_dp_mst_port *port; |
||
1675 | |||
1676 | mutex_lock(&mgr->payload_lock); |
||
1677 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1678 | /* solve the current payloads - compare to the hw ones |
||
1679 | - update the hw view */ |
||
1680 | req_payload.start_slot = cur_slots; |
||
1681 | if (mgr->proposed_vcpis[i]) { |
||
1682 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
||
1683 | req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; |
||
1684 | } else { |
||
1685 | port = NULL; |
||
1686 | req_payload.num_slots = 0; |
||
1687 | } |
||
5271 | serge | 1688 | |
1689 | if (mgr->payloads[i].start_slot != req_payload.start_slot) { |
||
1690 | mgr->payloads[i].start_slot = req_payload.start_slot; |
||
1691 | } |
||
5060 | serge | 1692 | /* work out what is required to happen with this payload */ |
5271 | serge | 1693 | if (mgr->payloads[i].num_slots != req_payload.num_slots) { |
5060 | serge | 1694 | |
1695 | /* need to push an update for this payload */ |
||
1696 | if (req_payload.num_slots) { |
||
5271 | serge | 1697 | drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); |
5060 | serge | 1698 | mgr->payloads[i].num_slots = req_payload.num_slots; |
1699 | } else if (mgr->payloads[i].num_slots) { |
||
1700 | mgr->payloads[i].num_slots = 0; |
||
5271 | serge | 1701 | drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]); |
5060 | serge | 1702 | req_payload.payload_state = mgr->payloads[i].payload_state; |
5271 | serge | 1703 | mgr->payloads[i].start_slot = 0; |
1704 | } |
||
5060 | serge | 1705 | mgr->payloads[i].payload_state = req_payload.payload_state; |
1706 | } |
||
1707 | cur_slots += req_payload.num_slots; |
||
1708 | } |
||
5271 | serge | 1709 | |
1710 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1711 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
||
1712 | DRM_DEBUG_KMS("removing payload %d\n", i); |
||
1713 | for (j = i; j < mgr->max_payloads - 1; j++) { |
||
1714 | memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); |
||
1715 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; |
||
1716 | if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { |
||
1717 | set_bit(j + 1, &mgr->payload_mask); |
||
1718 | } else { |
||
1719 | clear_bit(j + 1, &mgr->payload_mask); |
||
1720 | } |
||
1721 | } |
||
1722 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); |
||
1723 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; |
||
1724 | clear_bit(mgr->max_payloads, &mgr->payload_mask); |
||
1725 | |||
1726 | } |
||
1727 | } |
||
5060 | serge | 1728 | mutex_unlock(&mgr->payload_lock); |
1729 | |||
1730 | return 0; |
||
1731 | } |
||
1732 | EXPORT_SYMBOL(drm_dp_update_payload_part1); |
||
1733 | |||
1734 | /** |
||
1735 | * drm_dp_update_payload_part2() - Execute payload update part 2 |
||
1736 | * @mgr: manager to use. |
||
1737 | * |
||
1738 | * This iterates over all proposed virtual channels, and tries to |
||
1739 | * allocate space in the link for them. For 0->slots transitions, |
||
1740 | * this step writes the remote VC payload commands. For slots->0 |
||
1741 | * this just resets some internal state. |
||
1742 | */ |
||
1743 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) |
||
1744 | { |
||
1745 | struct drm_dp_mst_port *port; |
||
1746 | int i; |
||
1747 | int ret = 0; |
||
1748 | mutex_lock(&mgr->payload_lock); |
||
1749 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1750 | |||
1751 | if (!mgr->proposed_vcpis[i]) |
||
1752 | continue; |
||
1753 | |||
1754 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
||
1755 | |||
1756 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); |
||
1757 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { |
||
5271 | serge | 1758 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
5060 | serge | 1759 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
5271 | serge | 1760 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
5060 | serge | 1761 | } |
1762 | if (ret) { |
||
1763 | mutex_unlock(&mgr->payload_lock); |
||
1764 | return ret; |
||
1765 | } |
||
1766 | } |
||
1767 | mutex_unlock(&mgr->payload_lock); |
||
1768 | return 0; |
||
1769 | } |
||
1770 | EXPORT_SYMBOL(drm_dp_update_payload_part2); |
||
1771 | |||
1772 | #if 0 /* unused as of yet */ |
||
1773 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
||
1774 | struct drm_dp_mst_port *port, |
||
1775 | int offset, int size) |
||
1776 | { |
||
1777 | int len; |
||
1778 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1779 | |||
1780 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1781 | if (!txmsg) |
||
1782 | return -ENOMEM; |
||
1783 | |||
1784 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); |
||
1785 | txmsg->dst = port->parent; |
||
1786 | |||
1787 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1788 | |||
1789 | return 0; |
||
1790 | } |
||
1791 | #endif |
||
1792 | |||
1793 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
||
1794 | struct drm_dp_mst_port *port, |
||
1795 | int offset, int size, u8 *bytes) |
||
1796 | { |
||
1797 | int len; |
||
1798 | int ret; |
||
1799 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1800 | struct drm_dp_mst_branch *mstb; |
||
1801 | |||
1802 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
1803 | if (!mstb) |
||
1804 | return -EINVAL; |
||
1805 | |||
1806 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1807 | if (!txmsg) { |
||
1808 | ret = -ENOMEM; |
||
1809 | goto fail_put; |
||
1810 | } |
||
1811 | |||
1812 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
||
1813 | txmsg->dst = mstb; |
||
1814 | |||
1815 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1816 | |||
1817 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1818 | if (ret > 0) { |
||
1819 | if (txmsg->reply.reply_type == 1) { |
||
1820 | ret = -EINVAL; |
||
1821 | } else |
||
1822 | ret = 0; |
||
1823 | } |
||
1824 | kfree(txmsg); |
||
1825 | fail_put: |
||
1826 | drm_dp_put_mst_branch_device(mstb); |
||
1827 | return ret; |
||
1828 | } |
||
1829 | |||
1830 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) |
||
1831 | { |
||
1832 | struct drm_dp_sideband_msg_reply_body reply; |
||
1833 | |||
1834 | reply.reply_type = 1; |
||
1835 | reply.req_type = req_type; |
||
1836 | drm_dp_encode_sideband_reply(&reply, msg); |
||
1837 | return 0; |
||
1838 | } |
||
1839 | |||
1840 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, |
||
1841 | struct drm_dp_mst_branch *mstb, |
||
1842 | int req_type, int seqno, bool broadcast) |
||
1843 | { |
||
1844 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1845 | |||
1846 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1847 | if (!txmsg) |
||
1848 | return -ENOMEM; |
||
1849 | |||
1850 | txmsg->dst = mstb; |
||
1851 | txmsg->seqno = seqno; |
||
1852 | drm_dp_encode_up_ack_reply(txmsg, req_type); |
||
1853 | |||
1854 | mutex_lock(&mgr->qlock); |
||
1855 | list_add_tail(&txmsg->next, &mgr->tx_msg_upq); |
||
1856 | if (!mgr->tx_up_in_progress) { |
||
1857 | process_single_up_tx_qlock(mgr); |
||
1858 | } |
||
1859 | mutex_unlock(&mgr->qlock); |
||
1860 | return 0; |
||
1861 | } |
||
1862 | |||
5271 | serge | 1863 | static bool drm_dp_get_vc_payload_bw(int dp_link_bw, |
1864 | int dp_link_count, |
||
1865 | int *out) |
||
5060 | serge | 1866 | { |
1867 | switch (dp_link_bw) { |
||
5271 | serge | 1868 | default: |
1869 | DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", |
||
1870 | dp_link_bw, dp_link_count); |
||
1871 | return false; |
||
1872 | |||
5060 | serge | 1873 | case DP_LINK_BW_1_62: |
5271 | serge | 1874 | *out = 3 * dp_link_count; |
1875 | break; |
||
5060 | serge | 1876 | case DP_LINK_BW_2_7: |
5271 | serge | 1877 | *out = 5 * dp_link_count; |
1878 | break; |
||
5060 | serge | 1879 | case DP_LINK_BW_5_4: |
5271 | serge | 1880 | *out = 10 * dp_link_count; |
1881 | break; |
||
5060 | serge | 1882 | } |
5271 | serge | 1883 | return true; |
5060 | serge | 1884 | } |
1885 | |||
1886 | /** |
||
1887 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager |
||
1888 | * @mgr: manager to set state for |
||
1889 | * @mst_state: true to enable MST on this connector - false to disable. |
||
1890 | * |
||
1891 | * This is called by the driver when it detects an MST capable device plugged |
||
1892 | * into a DP MST capable port, or when a DP MST capable device is unplugged. |
||
1893 | */ |
||
1894 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) |
||
1895 | { |
||
1896 | int ret = 0; |
||
1897 | struct drm_dp_mst_branch *mstb = NULL; |
||
1898 | |||
1899 | mutex_lock(&mgr->lock); |
||
1900 | if (mst_state == mgr->mst_state) |
||
1901 | goto out_unlock; |
||
1902 | |||
1903 | mgr->mst_state = mst_state; |
||
1904 | /* set the device into MST mode */ |
||
1905 | if (mst_state) { |
||
1906 | WARN_ON(mgr->mst_primary); |
||
1907 | |||
1908 | /* get dpcd info */ |
||
1909 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
||
1910 | if (ret != DP_RECEIVER_CAP_SIZE) { |
||
1911 | DRM_DEBUG_KMS("failed to read DPCD\n"); |
||
1912 | goto out_unlock; |
||
1913 | } |
||
1914 | |||
5271 | serge | 1915 | if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
1916 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, |
||
1917 | &mgr->pbn_div)) { |
||
1918 | ret = -EINVAL; |
||
1919 | goto out_unlock; |
||
1920 | } |
||
1921 | |||
5060 | serge | 1922 | mgr->total_pbn = 2560; |
1923 | mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); |
||
1924 | mgr->avail_slots = mgr->total_slots; |
||
1925 | |||
1926 | /* add initial branch device at LCT 1 */ |
||
1927 | mstb = drm_dp_add_mst_branch_device(1, NULL); |
||
1928 | if (mstb == NULL) { |
||
1929 | ret = -ENOMEM; |
||
1930 | goto out_unlock; |
||
1931 | } |
||
1932 | mstb->mgr = mgr; |
||
1933 | |||
1934 | /* give this the main reference */ |
||
1935 | mgr->mst_primary = mstb; |
||
1936 | kref_get(&mgr->mst_primary->kref); |
||
1937 | |||
1938 | { |
||
1939 | struct drm_dp_payload reset_pay; |
||
1940 | reset_pay.start_slot = 0; |
||
1941 | reset_pay.num_slots = 0x3f; |
||
1942 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); |
||
1943 | } |
||
1944 | |||
1945 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
1946 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
||
1947 | if (ret < 0) { |
||
1948 | goto out_unlock; |
||
1949 | } |
||
1950 | |||
1951 | |||
1952 | /* sort out guid */ |
||
1953 | ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16); |
||
1954 | if (ret != 16) { |
||
1955 | DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret); |
||
1956 | goto out_unlock; |
||
1957 | } |
||
1958 | |||
1959 | mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid); |
||
1960 | if (!mgr->guid_valid) { |
||
1961 | ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16); |
||
1962 | mgr->guid_valid = true; |
||
1963 | } |
||
1964 | |||
1965 | // queue_work(system_long_wq, &mgr->work); |
||
1966 | |||
1967 | ret = 0; |
||
1968 | } else { |
||
1969 | /* disable MST on the device */ |
||
1970 | mstb = mgr->mst_primary; |
||
1971 | mgr->mst_primary = NULL; |
||
1972 | /* this can fail if the device is gone */ |
||
1973 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); |
||
1974 | ret = 0; |
||
1975 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); |
||
1976 | mgr->payload_mask = 0; |
||
1977 | set_bit(0, &mgr->payload_mask); |
||
5271 | serge | 1978 | mgr->vcpi_mask = 0; |
5060 | serge | 1979 | } |
1980 | |||
1981 | out_unlock: |
||
1982 | mutex_unlock(&mgr->lock); |
||
1983 | if (mstb) |
||
1984 | drm_dp_put_mst_branch_device(mstb); |
||
1985 | return ret; |
||
1986 | |||
1987 | } |
||
1988 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); |
||
1989 | |||
1990 | /** |
||
1991 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager |
||
1992 | * @mgr: manager to suspend |
||
1993 | * |
||
1994 | * This function tells the MST device that we can't handle UP messages |
||
1995 | * anymore. This should stop it from sending any since we are suspended. |
||
1996 | */ |
||
1997 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) |
||
1998 | { |
||
1999 | mutex_lock(&mgr->lock); |
||
2000 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
2001 | DP_MST_EN | DP_UPSTREAM_IS_SRC); |
||
2002 | mutex_unlock(&mgr->lock); |
||
2003 | } |
||
2004 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); |
||
2005 | |||
2006 | /** |
||
2007 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager |
||
2008 | * @mgr: manager to resume |
||
2009 | * |
||
2010 | * This will fetch DPCD and see if the device is still there, |
||
2011 | * if it is, it will rewrite the MSTM control bits, and return. |
||
2012 | * |
||
2013 | * if the device fails this returns -1, and the driver should do |
||
2014 | * a full MST reprobe, in case we were undocked. |
||
2015 | */ |
||
2016 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) |
||
2017 | { |
||
2018 | int ret = 0; |
||
2019 | |||
2020 | mutex_lock(&mgr->lock); |
||
2021 | |||
2022 | if (mgr->mst_primary) { |
||
2023 | int sret; |
||
2024 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
||
2025 | if (sret != DP_RECEIVER_CAP_SIZE) { |
||
2026 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
||
2027 | ret = -1; |
||
2028 | goto out_unlock; |
||
2029 | } |
||
2030 | |||
2031 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
2032 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
||
2033 | if (ret < 0) { |
||
2034 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); |
||
2035 | ret = -1; |
||
2036 | goto out_unlock; |
||
2037 | } |
||
2038 | ret = 0; |
||
2039 | } else |
||
2040 | ret = -1; |
||
2041 | |||
2042 | out_unlock: |
||
2043 | mutex_unlock(&mgr->lock); |
||
2044 | return ret; |
||
2045 | } |
||
2046 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); |
||
2047 | |||
2048 | static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) |
||
2049 | { |
||
2050 | int len; |
||
2051 | u8 replyblock[32]; |
||
2052 | int replylen, origlen, curreply; |
||
2053 | int ret; |
||
2054 | struct drm_dp_sideband_msg_rx *msg; |
||
2055 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; |
||
2056 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; |
||
2057 | |||
2058 | len = min(mgr->max_dpcd_transaction_bytes, 16); |
||
2059 | ret = drm_dp_dpcd_read(mgr->aux, basereg, |
||
2060 | replyblock, len); |
||
2061 | if (ret != len) { |
||
2062 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); |
||
2063 | return; |
||
2064 | } |
||
2065 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); |
||
2066 | if (!ret) { |
||
2067 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); |
||
2068 | return; |
||
2069 | } |
||
2070 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; |
||
2071 | |||
2072 | origlen = replylen; |
||
2073 | replylen -= len; |
||
2074 | curreply = len; |
||
2075 | while (replylen > 0) { |
||
2076 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); |
||
2077 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, |
||
2078 | replyblock, len); |
||
2079 | if (ret != len) { |
||
2080 | DRM_DEBUG_KMS("failed to read a chunk\n"); |
||
2081 | } |
||
2082 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); |
||
2083 | if (ret == false) |
||
2084 | DRM_DEBUG_KMS("failed to build sideband msg\n"); |
||
2085 | curreply += len; |
||
2086 | replylen -= len; |
||
2087 | } |
||
2088 | } |
||
2089 | |||
2090 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) |
||
2091 | { |
||
2092 | int ret = 0; |
||
2093 | |||
2094 | drm_dp_get_one_sb_msg(mgr, false); |
||
2095 | |||
2096 | if (mgr->down_rep_recv.have_eomt) { |
||
2097 | struct drm_dp_sideband_msg_tx *txmsg; |
||
2098 | struct drm_dp_mst_branch *mstb; |
||
2099 | int slot = -1; |
||
2100 | mstb = drm_dp_get_mst_branch_device(mgr, |
||
2101 | mgr->down_rep_recv.initial_hdr.lct, |
||
2102 | mgr->down_rep_recv.initial_hdr.rad); |
||
2103 | |||
2104 | if (!mstb) { |
||
2105 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); |
||
2106 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2107 | return 0; |
||
2108 | } |
||
2109 | |||
2110 | /* find the message */ |
||
2111 | slot = mgr->down_rep_recv.initial_hdr.seqno; |
||
2112 | mutex_lock(&mgr->qlock); |
||
2113 | txmsg = mstb->tx_slots[slot]; |
||
2114 | /* remove from slots */ |
||
2115 | mutex_unlock(&mgr->qlock); |
||
2116 | |||
2117 | if (!txmsg) { |
||
2118 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", |
||
2119 | mstb, |
||
2120 | mgr->down_rep_recv.initial_hdr.seqno, |
||
2121 | mgr->down_rep_recv.initial_hdr.lct, |
||
2122 | mgr->down_rep_recv.initial_hdr.rad[0], |
||
2123 | mgr->down_rep_recv.msg[0]); |
||
2124 | drm_dp_put_mst_branch_device(mstb); |
||
2125 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2126 | return 0; |
||
2127 | } |
||
2128 | |||
2129 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); |
||
2130 | if (txmsg->reply.reply_type == 1) { |
||
2131 | 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); |
||
2132 | } |
||
2133 | |||
2134 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2135 | drm_dp_put_mst_branch_device(mstb); |
||
2136 | |||
2137 | mutex_lock(&mgr->qlock); |
||
2138 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; |
||
2139 | mstb->tx_slots[slot] = NULL; |
||
2140 | mutex_unlock(&mgr->qlock); |
||
2141 | |||
2142 | // wake_up(&mgr->tx_waitq); |
||
2143 | } |
||
2144 | return ret; |
||
2145 | } |
||
2146 | |||
2147 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
||
2148 | { |
||
2149 | int ret = 0; |
||
2150 | drm_dp_get_one_sb_msg(mgr, true); |
||
2151 | |||
2152 | if (mgr->up_req_recv.have_eomt) { |
||
2153 | struct drm_dp_sideband_msg_req_body msg; |
||
2154 | struct drm_dp_mst_branch *mstb; |
||
2155 | bool seqno; |
||
2156 | mstb = drm_dp_get_mst_branch_device(mgr, |
||
2157 | mgr->up_req_recv.initial_hdr.lct, |
||
2158 | mgr->up_req_recv.initial_hdr.rad); |
||
2159 | if (!mstb) { |
||
2160 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
||
2161 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2162 | return 0; |
||
2163 | } |
||
2164 | |||
2165 | seqno = mgr->up_req_recv.initial_hdr.seqno; |
||
2166 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); |
||
2167 | |||
2168 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { |
||
2169 | drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); |
||
2170 | drm_dp_update_port(mstb, &msg.u.conn_stat); |
||
2171 | 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); |
||
2172 | (*mgr->cbs->hotplug)(mgr); |
||
2173 | |||
2174 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
||
2175 | drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); |
||
2176 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); |
||
2177 | } |
||
2178 | |||
2179 | drm_dp_put_mst_branch_device(mstb); |
||
2180 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2181 | } |
||
2182 | return ret; |
||
2183 | } |
||
2184 | |||
2185 | /** |
||
2186 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify |
||
2187 | * @mgr: manager to notify irq for. |
||
2188 | * @esi: 4 bytes from SINK_COUNT_ESI |
||
5271 | serge | 2189 | * @handled: whether the hpd interrupt was consumed or not |
5060 | serge | 2190 | * |
2191 | * This should be called from the driver when it detects a short IRQ, |
||
2192 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The |
||
2193 | * topology manager will process the sideband messages received as a result |
||
2194 | * of this. |
||
2195 | */ |
||
2196 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) |
||
2197 | { |
||
2198 | int ret = 0; |
||
2199 | int sc; |
||
2200 | *handled = false; |
||
2201 | sc = esi[0] & 0x3f; |
||
2202 | |||
2203 | if (sc != mgr->sink_count) { |
||
2204 | mgr->sink_count = sc; |
||
2205 | *handled = true; |
||
2206 | } |
||
2207 | |||
2208 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { |
||
2209 | ret = drm_dp_mst_handle_down_rep(mgr); |
||
2210 | *handled = true; |
||
2211 | } |
||
2212 | |||
2213 | if (esi[1] & DP_UP_REQ_MSG_RDY) { |
||
2214 | ret |= drm_dp_mst_handle_up_req(mgr); |
||
2215 | *handled = true; |
||
2216 | } |
||
2217 | |||
2218 | drm_dp_mst_kick_tx(mgr); |
||
2219 | return ret; |
||
2220 | } |
||
2221 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); |
||
2222 | |||
2223 | /** |
||
2224 | * drm_dp_mst_detect_port() - get connection status for an MST port |
||
2225 | * @mgr: manager for this port |
||
2226 | * @port: unverified pointer to a port |
||
2227 | * |
||
2228 | * This returns the current connection state for a port. It validates the |
||
2229 | * port pointer still exists so the caller doesn't require a reference |
||
2230 | */ |
||
5271 | serge | 2231 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, |
2232 | struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
5060 | serge | 2233 | { |
2234 | enum drm_connector_status status = connector_status_disconnected; |
||
2235 | |||
2236 | /* we need to search for the port in the mgr in case its gone */ |
||
2237 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2238 | if (!port) |
||
2239 | return connector_status_disconnected; |
||
2240 | |||
2241 | if (!port->ddps) |
||
2242 | goto out; |
||
2243 | |||
2244 | switch (port->pdt) { |
||
2245 | case DP_PEER_DEVICE_NONE: |
||
2246 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
2247 | break; |
||
2248 | |||
2249 | case DP_PEER_DEVICE_SST_SINK: |
||
2250 | status = connector_status_connected; |
||
5271 | serge | 2251 | /* for logical ports - cache the EDID */ |
2252 | if (port->port_num >= 8 && !port->cached_edid) { |
||
2253 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); |
||
2254 | } |
||
5060 | serge | 2255 | break; |
2256 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
2257 | if (port->ldps) |
||
2258 | status = connector_status_connected; |
||
2259 | break; |
||
2260 | } |
||
2261 | out: |
||
2262 | drm_dp_put_port(port); |
||
2263 | return status; |
||
2264 | } |
||
2265 | EXPORT_SYMBOL(drm_dp_mst_detect_port); |
||
2266 | |||
2267 | /** |
||
2268 | * drm_dp_mst_get_edid() - get EDID for an MST port |
||
2269 | * @connector: toplevel connector to get EDID for |
||
2270 | * @mgr: manager for this port |
||
2271 | * @port: unverified pointer to a port. |
||
2272 | * |
||
2273 | * This returns an EDID for the port connected to a connector, |
||
2274 | * It validates the pointer still exists so the caller doesn't require a |
||
2275 | * reference. |
||
2276 | */ |
||
2277 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2278 | { |
||
2279 | struct edid *edid = NULL; |
||
2280 | |||
2281 | /* we need to search for the port in the mgr in case its gone */ |
||
2282 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2283 | if (!port) |
||
2284 | return NULL; |
||
2285 | |||
5271 | serge | 2286 | if (port->cached_edid) |
2287 | edid = drm_edid_duplicate(port->cached_edid); |
||
6084 | serge | 2288 | else { |
2289 | edid = drm_get_edid(connector, &port->aux.ddc); |
||
2290 | drm_mode_connector_set_tile_property(connector); |
||
2291 | } |
||
5060 | serge | 2292 | drm_dp_put_port(port); |
2293 | return edid; |
||
2294 | } |
||
2295 | EXPORT_SYMBOL(drm_dp_mst_get_edid); |
||
2296 | |||
2297 | /** |
||
2298 | * drm_dp_find_vcpi_slots() - find slots for this PBN value |
||
2299 | * @mgr: manager to use |
||
2300 | * @pbn: payload bandwidth to convert into slots. |
||
2301 | */ |
||
2302 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, |
||
2303 | int pbn) |
||
2304 | { |
||
2305 | int num_slots; |
||
2306 | |||
2307 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
||
2308 | |||
2309 | if (num_slots > mgr->avail_slots) |
||
2310 | return -ENOSPC; |
||
2311 | return num_slots; |
||
2312 | } |
||
2313 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); |
||
2314 | |||
2315 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
||
2316 | struct drm_dp_vcpi *vcpi, int pbn) |
||
2317 | { |
||
2318 | int num_slots; |
||
2319 | int ret; |
||
2320 | |||
2321 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
||
2322 | |||
2323 | if (num_slots > mgr->avail_slots) |
||
2324 | return -ENOSPC; |
||
2325 | |||
2326 | vcpi->pbn = pbn; |
||
2327 | vcpi->aligned_pbn = num_slots * mgr->pbn_div; |
||
2328 | vcpi->num_slots = num_slots; |
||
2329 | |||
2330 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); |
||
2331 | if (ret < 0) |
||
2332 | return ret; |
||
2333 | return 0; |
||
2334 | } |
||
2335 | |||
2336 | /** |
||
2337 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel |
||
2338 | * @mgr: manager for this port |
||
2339 | * @port: port to allocate a virtual channel for. |
||
2340 | * @pbn: payload bandwidth number to request |
||
2341 | * @slots: returned number of slots for this PBN. |
||
2342 | */ |
||
2343 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) |
||
2344 | { |
||
2345 | int ret; |
||
2346 | |||
2347 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2348 | if (!port) |
||
2349 | return false; |
||
2350 | |||
2351 | if (port->vcpi.vcpi > 0) { |
||
2352 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); |
||
2353 | if (pbn == port->vcpi.pbn) { |
||
2354 | *slots = port->vcpi.num_slots; |
||
2355 | return true; |
||
2356 | } |
||
2357 | } |
||
2358 | |||
2359 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); |
||
2360 | if (ret) { |
||
2361 | DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); |
||
2362 | goto out; |
||
2363 | } |
||
2364 | DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); |
||
2365 | *slots = port->vcpi.num_slots; |
||
2366 | |||
2367 | drm_dp_put_port(port); |
||
2368 | return true; |
||
2369 | out: |
||
2370 | return false; |
||
2371 | } |
||
2372 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); |
||
2373 | |||
6084 | serge | 2374 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
2375 | { |
||
2376 | int slots = 0; |
||
2377 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2378 | if (!port) |
||
2379 | return slots; |
||
2380 | |||
2381 | slots = port->vcpi.num_slots; |
||
2382 | drm_dp_put_port(port); |
||
2383 | return slots; |
||
2384 | } |
||
2385 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); |
||
2386 | |||
5060 | serge | 2387 | /** |
2388 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI |
||
2389 | * @mgr: manager for this port |
||
2390 | * @port: unverified pointer to a port. |
||
2391 | * |
||
2392 | * This just resets the number of slots for the ports VCPI for later programming. |
||
2393 | */ |
||
2394 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2395 | { |
||
2396 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2397 | if (!port) |
||
2398 | return; |
||
2399 | port->vcpi.num_slots = 0; |
||
2400 | drm_dp_put_port(port); |
||
2401 | } |
||
2402 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); |
||
2403 | |||
2404 | /** |
||
2405 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI |
||
2406 | * @mgr: manager for this port |
||
2407 | * @port: unverified port to deallocate vcpi for |
||
2408 | */ |
||
2409 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2410 | { |
||
2411 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2412 | if (!port) |
||
2413 | return; |
||
2414 | |||
2415 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); |
||
2416 | port->vcpi.num_slots = 0; |
||
2417 | port->vcpi.pbn = 0; |
||
2418 | port->vcpi.aligned_pbn = 0; |
||
2419 | port->vcpi.vcpi = 0; |
||
2420 | drm_dp_put_port(port); |
||
2421 | } |
||
2422 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); |
||
2423 | |||
2424 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
||
2425 | int id, struct drm_dp_payload *payload) |
||
2426 | { |
||
2427 | u8 payload_alloc[3], status; |
||
2428 | int ret; |
||
2429 | int retries = 0; |
||
2430 | |||
2431 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, |
||
2432 | DP_PAYLOAD_TABLE_UPDATED); |
||
2433 | |||
2434 | payload_alloc[0] = id; |
||
2435 | payload_alloc[1] = payload->start_slot; |
||
2436 | payload_alloc[2] = payload->num_slots; |
||
2437 | |||
2438 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); |
||
2439 | if (ret != 3) { |
||
2440 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); |
||
2441 | goto fail; |
||
2442 | } |
||
2443 | |||
2444 | retry: |
||
2445 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
||
2446 | if (ret < 0) { |
||
2447 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
||
2448 | goto fail; |
||
2449 | } |
||
2450 | |||
2451 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { |
||
2452 | retries++; |
||
2453 | if (retries < 20) { |
||
2454 | usleep_range(10000, 20000); |
||
2455 | goto retry; |
||
2456 | } |
||
2457 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); |
||
2458 | ret = -EINVAL; |
||
2459 | goto fail; |
||
2460 | } |
||
2461 | ret = 0; |
||
2462 | fail: |
||
2463 | return ret; |
||
2464 | } |
||
2465 | |||
2466 | |||
2467 | /** |
||
2468 | * drm_dp_check_act_status() - Check ACT handled status. |
||
2469 | * @mgr: manager to use |
||
2470 | * |
||
2471 | * Check the payload status bits in the DPCD for ACT handled completion. |
||
2472 | */ |
||
2473 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) |
||
2474 | { |
||
2475 | u8 status; |
||
2476 | int ret; |
||
2477 | int count = 0; |
||
2478 | |||
2479 | do { |
||
2480 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
||
2481 | |||
2482 | if (ret < 0) { |
||
2483 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
||
2484 | goto fail; |
||
2485 | } |
||
2486 | |||
2487 | if (status & DP_PAYLOAD_ACT_HANDLED) |
||
2488 | break; |
||
2489 | count++; |
||
2490 | udelay(100); |
||
2491 | |||
2492 | } while (count < 30); |
||
2493 | |||
2494 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { |
||
2495 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); |
||
2496 | ret = -EINVAL; |
||
2497 | goto fail; |
||
2498 | } |
||
2499 | return 0; |
||
2500 | fail: |
||
2501 | return ret; |
||
2502 | } |
||
2503 | EXPORT_SYMBOL(drm_dp_check_act_status); |
||
2504 | |||
2505 | /** |
||
2506 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. |
||
2507 | * @clock: dot clock for the mode |
||
2508 | * @bpp: bpp for the mode. |
||
2509 | * |
||
2510 | * This uses the formula in the spec to calculate the PBN value for a mode. |
||
2511 | */ |
||
2512 | int drm_dp_calc_pbn_mode(int clock, int bpp) |
||
2513 | { |
||
2514 | fixed20_12 pix_bw; |
||
2515 | fixed20_12 fbpp; |
||
2516 | fixed20_12 result; |
||
2517 | fixed20_12 margin, tmp; |
||
2518 | u32 res; |
||
2519 | |||
2520 | pix_bw.full = dfixed_const(clock); |
||
2521 | fbpp.full = dfixed_const(bpp); |
||
2522 | tmp.full = dfixed_const(8); |
||
2523 | fbpp.full = dfixed_div(fbpp, tmp); |
||
2524 | |||
2525 | result.full = dfixed_mul(pix_bw, fbpp); |
||
2526 | margin.full = dfixed_const(54); |
||
2527 | tmp.full = dfixed_const(64); |
||
2528 | margin.full = dfixed_div(margin, tmp); |
||
2529 | result.full = dfixed_div(result, margin); |
||
2530 | |||
2531 | margin.full = dfixed_const(1006); |
||
2532 | tmp.full = dfixed_const(1000); |
||
2533 | margin.full = dfixed_div(margin, tmp); |
||
2534 | result.full = dfixed_mul(result, margin); |
||
2535 | |||
2536 | result.full = dfixed_div(result, tmp); |
||
2537 | result.full = dfixed_ceil(result); |
||
2538 | res = dfixed_trunc(result); |
||
2539 | return res; |
||
2540 | } |
||
2541 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); |
||
2542 | |||
2543 | static int test_calc_pbn_mode(void) |
||
2544 | { |
||
2545 | int ret; |
||
2546 | ret = drm_dp_calc_pbn_mode(154000, 30); |
||
2547 | if (ret != 689) |
||
2548 | return -EINVAL; |
||
2549 | ret = drm_dp_calc_pbn_mode(234000, 30); |
||
2550 | if (ret != 1047) |
||
2551 | return -EINVAL; |
||
2552 | return 0; |
||
2553 | } |
||
2554 | |||
2555 | /* we want to kick the TX after we've ack the up/down IRQs. */ |
||
2556 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) |
||
2557 | { |
||
2558 | // queue_work(system_long_wq, &mgr->tx_work); |
||
2559 | } |
||
2560 | |||
2561 | static void drm_dp_mst_dump_mstb(struct seq_file *m, |
||
2562 | struct drm_dp_mst_branch *mstb) |
||
2563 | { |
||
2564 | struct drm_dp_mst_port *port; |
||
2565 | int tabs = mstb->lct; |
||
2566 | char prefix[10]; |
||
2567 | int i; |
||
2568 | |||
2569 | for (i = 0; i < tabs; i++) |
||
2570 | prefix[i] = '\t'; |
||
2571 | prefix[i] = '\0'; |
||
2572 | |||
2573 | // seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); |
||
2574 | // list_for_each_entry(port, &mstb->ports, next) { |
||
2575 | // seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); |
||
2576 | // if (port->mstb) |
||
2577 | // drm_dp_mst_dump_mstb(m, port->mstb); |
||
2578 | // } |
||
2579 | } |
||
2580 | |||
2581 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
||
2582 | char *buf) |
||
2583 | { |
||
2584 | int ret; |
||
2585 | int i; |
||
2586 | for (i = 0; i < 4; i++) { |
||
2587 | ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); |
||
2588 | if (ret != 16) |
||
2589 | break; |
||
2590 | } |
||
2591 | if (i == 4) |
||
2592 | return true; |
||
2593 | return false; |
||
2594 | } |
||
2595 | |||
2596 | /** |
||
2597 | * drm_dp_mst_dump_topology(): dump topology to seq file. |
||
2598 | * @m: seq_file to dump output to |
||
2599 | * @mgr: manager to dump current topology for. |
||
2600 | * |
||
2601 | * helper to dump MST topology to a seq file for debugfs. |
||
2602 | */ |
||
2603 | void drm_dp_mst_dump_topology(struct seq_file *m, |
||
2604 | struct drm_dp_mst_topology_mgr *mgr) |
||
2605 | { |
||
2606 | int i; |
||
2607 | struct drm_dp_mst_port *port; |
||
2608 | mutex_lock(&mgr->lock); |
||
2609 | if (mgr->mst_primary) |
||
2610 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); |
||
2611 | |||
2612 | /* dump VCPIs */ |
||
2613 | mutex_unlock(&mgr->lock); |
||
2614 | |||
2615 | |||
2616 | |||
2617 | } |
||
2618 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); |
||
2619 | |||
2620 | static void drm_dp_tx_work(struct work_struct *work) |
||
2621 | { |
||
2622 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); |
||
2623 | |||
2624 | mutex_lock(&mgr->qlock); |
||
2625 | if (mgr->tx_down_in_progress) |
||
2626 | process_single_down_tx_qlock(mgr); |
||
2627 | mutex_unlock(&mgr->qlock); |
||
2628 | } |
||
2629 | |||
2630 | /** |
||
2631 | * drm_dp_mst_topology_mgr_init - initialise a topology manager |
||
2632 | * @mgr: manager struct to initialise |
||
2633 | * @dev: device providing this structure - for i2c addition. |
||
2634 | * @aux: DP helper aux channel to talk to this device |
||
2635 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit |
||
2636 | * @max_payloads: maximum number of payloads this GPU can source |
||
2637 | * @conn_base_id: the connector object ID the MST device is connected to. |
||
2638 | * |
||
2639 | * Return 0 for success, or negative error code on failure |
||
2640 | */ |
||
2641 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, |
||
2642 | struct device *dev, struct drm_dp_aux *aux, |
||
2643 | int max_dpcd_transaction_bytes, |
||
2644 | int max_payloads, int conn_base_id) |
||
2645 | { |
||
2646 | mutex_init(&mgr->lock); |
||
2647 | mutex_init(&mgr->qlock); |
||
2648 | mutex_init(&mgr->payload_lock); |
||
6084 | serge | 2649 | mutex_init(&mgr->destroy_connector_lock); |
5060 | serge | 2650 | INIT_LIST_HEAD(&mgr->tx_msg_upq); |
2651 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
||
6084 | serge | 2652 | INIT_LIST_HEAD(&mgr->destroy_connector_list); |
5060 | serge | 2653 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
2654 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); |
||
6088 | serge | 2655 | init_waitqueue_head(&mgr->tx_waitq); |
5060 | serge | 2656 | mgr->dev = dev; |
2657 | mgr->aux = aux; |
||
2658 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; |
||
2659 | mgr->max_payloads = max_payloads; |
||
2660 | mgr->conn_base_id = conn_base_id; |
||
2661 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
||
2662 | if (!mgr->payloads) |
||
2663 | return -ENOMEM; |
||
2664 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); |
||
2665 | if (!mgr->proposed_vcpis) |
||
2666 | return -ENOMEM; |
||
2667 | set_bit(0, &mgr->payload_mask); |
||
2668 | test_calc_pbn_mode(); |
||
2669 | return 0; |
||
2670 | } |
||
2671 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); |
||
2672 | |||
2673 | /** |
||
2674 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. |
||
2675 | * @mgr: manager to destroy |
||
2676 | */ |
||
2677 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) |
||
2678 | { |
||
2679 | mutex_lock(&mgr->payload_lock); |
||
2680 | kfree(mgr->payloads); |
||
2681 | mgr->payloads = NULL; |
||
2682 | kfree(mgr->proposed_vcpis); |
||
2683 | mgr->proposed_vcpis = NULL; |
||
2684 | mutex_unlock(&mgr->payload_lock); |
||
2685 | mgr->dev = NULL; |
||
2686 | mgr->aux = NULL; |
||
2687 | } |
||
2688 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); |
||
2689 | |||
2690 | /* I2C device */ |
||
2691 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, |
||
2692 | int num) |
||
2693 | { |
||
2694 | struct drm_dp_aux *aux = adapter->algo_data; |
||
2695 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); |
||
2696 | struct drm_dp_mst_branch *mstb; |
||
2697 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
||
2698 | unsigned int i; |
||
2699 | bool reading = false; |
||
2700 | struct drm_dp_sideband_msg_req_body msg; |
||
2701 | struct drm_dp_sideband_msg_tx *txmsg = NULL; |
||
2702 | int ret; |
||
2703 | |||
2704 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
2705 | if (!mstb) |
||
2706 | return -EREMOTEIO; |
||
2707 | |||
2708 | /* construct i2c msg */ |
||
2709 | /* see if last msg is a read */ |
||
2710 | if (msgs[num - 1].flags & I2C_M_RD) |
||
2711 | reading = true; |
||
2712 | |||
6084 | serge | 2713 | if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { |
5060 | serge | 2714 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
2715 | ret = -EIO; |
||
2716 | goto out; |
||
2717 | } |
||
2718 | |||
6084 | serge | 2719 | memset(&msg, 0, sizeof(msg)); |
5060 | serge | 2720 | msg.req_type = DP_REMOTE_I2C_READ; |
2721 | msg.u.i2c_read.num_transactions = num - 1; |
||
2722 | msg.u.i2c_read.port_number = port->port_num; |
||
2723 | for (i = 0; i < num - 1; i++) { |
||
2724 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; |
||
2725 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; |
||
2726 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; |
||
2727 | } |
||
2728 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; |
||
2729 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; |
||
2730 | |||
2731 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
2732 | if (!txmsg) { |
||
2733 | ret = -ENOMEM; |
||
2734 | goto out; |
||
2735 | } |
||
2736 | |||
2737 | txmsg->dst = mstb; |
||
2738 | drm_dp_encode_sideband_req(&msg, txmsg); |
||
2739 | |||
2740 | drm_dp_queue_down_tx(mgr, txmsg); |
||
2741 | |||
2742 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
2743 | if (ret > 0) { |
||
2744 | |||
2745 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ |
||
2746 | ret = -EREMOTEIO; |
||
2747 | goto out; |
||
2748 | } |
||
2749 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { |
||
2750 | ret = -EIO; |
||
2751 | goto out; |
||
2752 | } |
||
2753 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); |
||
2754 | ret = num; |
||
2755 | } |
||
2756 | out: |
||
2757 | kfree(txmsg); |
||
2758 | drm_dp_put_mst_branch_device(mstb); |
||
2759 | return ret; |
||
2760 | } |
||
2761 | |||
2762 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) |
||
2763 | { |
||
2764 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | |
||
2765 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | |
||
2766 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | |
||
2767 | I2C_FUNC_10BIT_ADDR; |
||
2768 | } |
||
2769 | |||
2770 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { |
||
2771 | .functionality = drm_dp_mst_i2c_functionality, |
||
2772 | .master_xfer = drm_dp_mst_i2c_xfer, |
||
2773 | }; |
||
2774 | |||
2775 | /** |
||
2776 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX |
||
2777 | * @aux: DisplayPort AUX channel |
||
2778 | * |
||
2779 | * Returns 0 on success or a negative error code on failure. |
||
2780 | */ |
||
2781 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) |
||
2782 | { |
||
2783 | aux->ddc.algo = &drm_dp_mst_i2c_algo; |
||
2784 | aux->ddc.algo_data = aux; |
||
2785 | aux->ddc.retries = 3; |
||
2786 | |||
2787 | aux->ddc.class = I2C_CLASS_DDC; |
||
2788 | aux->ddc.owner = THIS_MODULE; |
||
2789 | aux->ddc.dev.parent = aux->dev; |
||
2790 | |||
2791 | return i2c_add_adapter(&aux->ddc); |
||
2792 | } |
||
2793 | |||
2794 | /** |
||
2795 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter |
||
2796 | * @aux: DisplayPort AUX channel |
||
2797 | */ |
||
2798 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) |
||
2799 | { |
||
2800 | i2c_del_adapter(&aux->ddc); |
||
2801 | }>>>>>>>>>>>>>>>>>>>>>>><>>><>><>><>><>><>>><>><>><>>><>><>><>><>><>><>>><>><>>><>><>><>><>><>>><>=><=>=><=>=><=>=><=> |