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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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29 | #include |
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30 | #include |
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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 | |||
36 | #include |
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37 | |||
38 | u64 get_jiffies_64(void) |
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39 | { |
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40 | return jiffies; |
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41 | } |
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42 | /** |
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43 | * DOC: dp mst helper |
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44 | * |
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45 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport |
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46 | * protocol. The helpers contain a topology manager and bandwidth manager. |
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47 | * The helpers encapsulate the sending and received of sideband msgs. |
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48 | */ |
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49 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
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50 | char *buf); |
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51 | static int test_calc_pbn_mode(void); |
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52 | |||
53 | static void drm_dp_put_port(struct drm_dp_mst_port *port); |
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54 | |||
55 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
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56 | int id, |
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57 | struct drm_dp_payload *payload); |
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58 | |||
59 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
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60 | struct drm_dp_mst_port *port, |
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61 | int offset, int size, u8 *bytes); |
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62 | |||
63 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
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64 | struct drm_dp_mst_branch *mstb); |
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65 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
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66 | struct drm_dp_mst_branch *mstb, |
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67 | struct drm_dp_mst_port *port); |
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68 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
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69 | u8 *guid); |
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70 | |||
71 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); |
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72 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); |
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73 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); |
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74 | /* sideband msg handling */ |
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75 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) |
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76 | { |
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77 | u8 bitmask = 0x80; |
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78 | u8 bitshift = 7; |
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79 | u8 array_index = 0; |
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80 | int number_of_bits = num_nibbles * 4; |
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81 | u8 remainder = 0; |
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82 | |||
83 | while (number_of_bits != 0) { |
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84 | number_of_bits--; |
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85 | remainder <<= 1; |
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86 | remainder |= (data[array_index] & bitmask) >> bitshift; |
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87 | bitmask >>= 1; |
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88 | bitshift--; |
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89 | if (bitmask == 0) { |
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90 | bitmask = 0x80; |
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91 | bitshift = 7; |
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92 | array_index++; |
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93 | } |
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94 | if ((remainder & 0x10) == 0x10) |
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95 | remainder ^= 0x13; |
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96 | } |
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97 | |||
98 | number_of_bits = 4; |
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99 | while (number_of_bits != 0) { |
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100 | number_of_bits--; |
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101 | remainder <<= 1; |
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102 | if ((remainder & 0x10) != 0) |
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103 | remainder ^= 0x13; |
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104 | } |
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105 | |||
106 | return remainder; |
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107 | } |
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108 | |||
109 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) |
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110 | { |
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111 | u8 bitmask = 0x80; |
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112 | u8 bitshift = 7; |
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113 | u8 array_index = 0; |
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114 | int number_of_bits = number_of_bytes * 8; |
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115 | u16 remainder = 0; |
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116 | |||
117 | while (number_of_bits != 0) { |
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118 | number_of_bits--; |
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119 | remainder <<= 1; |
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120 | remainder |= (data[array_index] & bitmask) >> bitshift; |
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121 | bitmask >>= 1; |
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122 | bitshift--; |
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123 | if (bitmask == 0) { |
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124 | bitmask = 0x80; |
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125 | bitshift = 7; |
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126 | array_index++; |
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127 | } |
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128 | if ((remainder & 0x100) == 0x100) |
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129 | remainder ^= 0xd5; |
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130 | } |
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131 | |||
132 | number_of_bits = 8; |
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133 | while (number_of_bits != 0) { |
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134 | number_of_bits--; |
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135 | remainder <<= 1; |
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136 | if ((remainder & 0x100) != 0) |
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137 | remainder ^= 0xd5; |
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138 | } |
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139 | |||
140 | return remainder & 0xff; |
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141 | } |
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142 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) |
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143 | { |
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144 | u8 size = 3; |
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145 | size += (hdr->lct / 2); |
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146 | return size; |
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147 | } |
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148 | |||
149 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
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150 | u8 *buf, int *len) |
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151 | { |
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152 | int idx = 0; |
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153 | int i; |
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154 | u8 crc4; |
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155 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); |
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156 | for (i = 0; i < (hdr->lct / 2); i++) |
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157 | buf[idx++] = hdr->rad[i]; |
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158 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | |
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159 | (hdr->msg_len & 0x3f); |
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160 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); |
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161 | |||
162 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); |
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163 | buf[idx - 1] |= (crc4 & 0xf); |
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164 | |||
165 | *len = idx; |
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166 | } |
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167 | |||
168 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
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169 | u8 *buf, int buflen, u8 *hdrlen) |
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170 | { |
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171 | u8 crc4; |
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172 | u8 len; |
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173 | int i; |
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174 | u8 idx; |
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175 | if (buf[0] == 0) |
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176 | return false; |
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177 | len = 3; |
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178 | len += ((buf[0] & 0xf0) >> 4) / 2; |
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179 | if (len > buflen) |
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180 | return false; |
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181 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); |
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182 | |||
183 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { |
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184 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); |
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185 | return false; |
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186 | } |
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187 | |||
188 | hdr->lct = (buf[0] & 0xf0) >> 4; |
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189 | hdr->lcr = (buf[0] & 0xf); |
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190 | idx = 1; |
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191 | for (i = 0; i < (hdr->lct / 2); i++) |
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192 | hdr->rad[i] = buf[idx++]; |
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193 | hdr->broadcast = (buf[idx] >> 7) & 0x1; |
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194 | hdr->path_msg = (buf[idx] >> 6) & 0x1; |
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195 | hdr->msg_len = buf[idx] & 0x3f; |
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196 | idx++; |
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197 | hdr->somt = (buf[idx] >> 7) & 0x1; |
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198 | hdr->eomt = (buf[idx] >> 6) & 0x1; |
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199 | hdr->seqno = (buf[idx] >> 4) & 0x1; |
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200 | idx++; |
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201 | *hdrlen = idx; |
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202 | return true; |
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203 | } |
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204 | |||
205 | static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, |
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206 | struct drm_dp_sideband_msg_tx *raw) |
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207 | { |
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208 | int idx = 0; |
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209 | int i; |
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210 | u8 *buf = raw->msg; |
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211 | buf[idx++] = req->req_type & 0x7f; |
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212 | |||
213 | switch (req->req_type) { |
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214 | case DP_ENUM_PATH_RESOURCES: |
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215 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
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216 | idx++; |
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217 | break; |
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218 | case DP_ALLOCATE_PAYLOAD: |
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219 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | |
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220 | (req->u.allocate_payload.number_sdp_streams & 0xf); |
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221 | idx++; |
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222 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); |
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223 | idx++; |
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224 | buf[idx] = (req->u.allocate_payload.pbn >> 8); |
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225 | idx++; |
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226 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); |
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227 | idx++; |
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228 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { |
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229 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | |
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230 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); |
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231 | idx++; |
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232 | } |
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233 | if (req->u.allocate_payload.number_sdp_streams & 1) { |
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234 | i = req->u.allocate_payload.number_sdp_streams - 1; |
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235 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; |
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236 | idx++; |
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237 | } |
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238 | break; |
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239 | case DP_QUERY_PAYLOAD: |
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240 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; |
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241 | idx++; |
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242 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); |
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243 | idx++; |
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244 | break; |
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245 | case DP_REMOTE_DPCD_READ: |
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246 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; |
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247 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; |
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248 | idx++; |
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249 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; |
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250 | idx++; |
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251 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); |
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252 | idx++; |
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253 | buf[idx] = (req->u.dpcd_read.num_bytes); |
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254 | idx++; |
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255 | break; |
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256 | |||
257 | case DP_REMOTE_DPCD_WRITE: |
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258 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; |
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259 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; |
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260 | idx++; |
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261 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; |
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262 | idx++; |
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263 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); |
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264 | idx++; |
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265 | buf[idx] = (req->u.dpcd_write.num_bytes); |
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266 | idx++; |
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267 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); |
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268 | idx += req->u.dpcd_write.num_bytes; |
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269 | break; |
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270 | case DP_REMOTE_I2C_READ: |
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271 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; |
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272 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); |
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273 | idx++; |
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274 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { |
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275 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; |
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276 | idx++; |
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277 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; |
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278 | idx++; |
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279 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); |
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280 | idx += req->u.i2c_read.transactions[i].num_bytes; |
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281 | |||
282 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; |
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283 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); |
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284 | idx++; |
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285 | } |
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286 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; |
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287 | idx++; |
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288 | buf[idx] = (req->u.i2c_read.num_bytes_read); |
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289 | idx++; |
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290 | break; |
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291 | |||
292 | case DP_REMOTE_I2C_WRITE: |
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293 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; |
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294 | idx++; |
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295 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; |
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296 | idx++; |
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297 | buf[idx] = (req->u.i2c_write.num_bytes); |
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298 | idx++; |
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299 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); |
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300 | idx += req->u.i2c_write.num_bytes; |
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301 | break; |
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302 | } |
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303 | raw->cur_len = idx; |
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304 | } |
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305 | |||
306 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) |
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307 | { |
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308 | u8 crc4; |
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309 | crc4 = drm_dp_msg_data_crc4(msg, len); |
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310 | msg[len] = crc4; |
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311 | } |
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312 | |||
313 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, |
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314 | struct drm_dp_sideband_msg_tx *raw) |
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315 | { |
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316 | int idx = 0; |
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317 | u8 *buf = raw->msg; |
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318 | |||
319 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); |
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320 | |||
321 | raw->cur_len = idx; |
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322 | } |
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323 | |||
324 | /* this adds a chunk of msg to the builder to get the final msg */ |
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325 | static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, |
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326 | u8 *replybuf, u8 replybuflen, bool hdr) |
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327 | { |
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328 | int ret; |
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329 | u8 crc4; |
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330 | |||
331 | if (hdr) { |
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332 | u8 hdrlen; |
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333 | struct drm_dp_sideband_msg_hdr recv_hdr; |
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334 | ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); |
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335 | if (ret == false) { |
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336 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); |
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337 | return false; |
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338 | } |
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339 | |||
340 | /* get length contained in this portion */ |
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341 | msg->curchunk_len = recv_hdr.msg_len; |
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342 | msg->curchunk_hdrlen = hdrlen; |
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343 | |||
344 | /* we have already gotten an somt - don't bother parsing */ |
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345 | if (recv_hdr.somt && msg->have_somt) |
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346 | return false; |
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347 | |||
348 | if (recv_hdr.somt) { |
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349 | memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); |
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350 | msg->have_somt = true; |
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351 | } |
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352 | if (recv_hdr.eomt) |
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353 | msg->have_eomt = true; |
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354 | |||
355 | /* copy the bytes for the remainder of this header chunk */ |
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356 | msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); |
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357 | memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); |
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358 | } else { |
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359 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); |
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360 | msg->curchunk_idx += replybuflen; |
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361 | } |
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362 | |||
363 | if (msg->curchunk_idx >= msg->curchunk_len) { |
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364 | /* do CRC */ |
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365 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); |
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366 | /* copy chunk into bigger msg */ |
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367 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); |
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368 | msg->curlen += msg->curchunk_len - 1; |
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369 | } |
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370 | return true; |
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371 | } |
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372 | |||
373 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, |
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374 | struct drm_dp_sideband_msg_reply_body *repmsg) |
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375 | { |
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376 | int idx = 1; |
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377 | int i; |
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378 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); |
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379 | idx += 16; |
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380 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; |
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381 | idx++; |
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382 | if (idx > raw->curlen) |
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383 | goto fail_len; |
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384 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { |
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385 | if (raw->msg[idx] & 0x80) |
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386 | repmsg->u.link_addr.ports[i].input_port = 1; |
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387 | |||
388 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; |
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389 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); |
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390 | |||
391 | idx++; |
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392 | if (idx > raw->curlen) |
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393 | goto fail_len; |
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394 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; |
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395 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; |
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396 | if (repmsg->u.link_addr.ports[i].input_port == 0) |
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397 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
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398 | idx++; |
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399 | if (idx > raw->curlen) |
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400 | goto fail_len; |
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401 | if (repmsg->u.link_addr.ports[i].input_port == 0) { |
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402 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); |
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403 | idx++; |
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404 | if (idx > raw->curlen) |
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405 | goto fail_len; |
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406 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); |
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407 | idx += 16; |
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408 | if (idx > raw->curlen) |
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409 | goto fail_len; |
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410 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; |
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411 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); |
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412 | idx++; |
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413 | |||
414 | } |
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415 | if (idx > raw->curlen) |
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416 | goto fail_len; |
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417 | } |
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418 | |||
419 | return true; |
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420 | fail_len: |
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421 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
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422 | return false; |
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423 | } |
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424 | |||
425 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, |
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426 | struct drm_dp_sideband_msg_reply_body *repmsg) |
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427 | { |
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428 | int idx = 1; |
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429 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; |
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430 | idx++; |
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431 | if (idx > raw->curlen) |
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432 | goto fail_len; |
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433 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; |
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434 | if (idx > raw->curlen) |
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435 | goto fail_len; |
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436 | |||
437 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); |
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438 | return true; |
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439 | fail_len: |
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440 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
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441 | return false; |
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442 | } |
||
443 | |||
444 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, |
||
445 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
446 | { |
||
447 | int idx = 1; |
||
448 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; |
||
449 | idx++; |
||
450 | if (idx > raw->curlen) |
||
451 | goto fail_len; |
||
452 | return true; |
||
453 | fail_len: |
||
454 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); |
||
455 | return false; |
||
456 | } |
||
457 | |||
458 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, |
||
459 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
460 | { |
||
461 | int idx = 1; |
||
462 | |||
463 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); |
||
464 | idx++; |
||
465 | if (idx > raw->curlen) |
||
466 | goto fail_len; |
||
467 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; |
||
468 | idx++; |
||
469 | /* TODO check */ |
||
470 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); |
||
471 | return true; |
||
472 | fail_len: |
||
473 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); |
||
474 | return false; |
||
475 | } |
||
476 | |||
477 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, |
||
478 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
479 | { |
||
480 | int idx = 1; |
||
481 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; |
||
482 | idx++; |
||
483 | if (idx > raw->curlen) |
||
484 | goto fail_len; |
||
485 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
||
486 | idx += 2; |
||
487 | if (idx > raw->curlen) |
||
488 | goto fail_len; |
||
489 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
||
490 | idx += 2; |
||
491 | if (idx > raw->curlen) |
||
492 | goto fail_len; |
||
493 | return true; |
||
494 | fail_len: |
||
495 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); |
||
496 | return false; |
||
497 | } |
||
498 | |||
499 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
||
500 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
501 | { |
||
502 | int idx = 1; |
||
503 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
||
504 | idx++; |
||
505 | if (idx > raw->curlen) |
||
506 | goto fail_len; |
||
507 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; |
||
508 | idx++; |
||
509 | if (idx > raw->curlen) |
||
510 | goto fail_len; |
||
511 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
||
512 | idx += 2; |
||
513 | if (idx > raw->curlen) |
||
514 | goto fail_len; |
||
515 | return true; |
||
516 | fail_len: |
||
517 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); |
||
518 | return false; |
||
519 | } |
||
520 | |||
521 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
||
522 | struct drm_dp_sideband_msg_reply_body *repmsg) |
||
523 | { |
||
524 | int idx = 1; |
||
525 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
||
526 | idx++; |
||
527 | if (idx > raw->curlen) |
||
528 | goto fail_len; |
||
529 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
||
530 | idx += 2; |
||
531 | if (idx > raw->curlen) |
||
532 | goto fail_len; |
||
533 | return true; |
||
534 | fail_len: |
||
535 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); |
||
536 | return false; |
||
537 | } |
||
538 | |||
539 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
||
540 | struct drm_dp_sideband_msg_reply_body *msg) |
||
541 | { |
||
542 | memset(msg, 0, sizeof(*msg)); |
||
543 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; |
||
544 | msg->req_type = (raw->msg[0] & 0x7f); |
||
545 | |||
546 | if (msg->reply_type) { |
||
547 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); |
||
548 | msg->u.nak.reason = raw->msg[17]; |
||
549 | msg->u.nak.nak_data = raw->msg[18]; |
||
550 | return false; |
||
551 | } |
||
552 | |||
553 | switch (msg->req_type) { |
||
554 | case DP_LINK_ADDRESS: |
||
555 | return drm_dp_sideband_parse_link_address(raw, msg); |
||
556 | case DP_QUERY_PAYLOAD: |
||
557 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); |
||
558 | case DP_REMOTE_DPCD_READ: |
||
559 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); |
||
560 | case DP_REMOTE_DPCD_WRITE: |
||
561 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); |
||
562 | case DP_REMOTE_I2C_READ: |
||
563 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); |
||
564 | case DP_ENUM_PATH_RESOURCES: |
||
565 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); |
||
566 | case DP_ALLOCATE_PAYLOAD: |
||
567 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); |
||
568 | default: |
||
569 | DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); |
||
570 | return false; |
||
571 | } |
||
572 | } |
||
573 | |||
574 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, |
||
575 | struct drm_dp_sideband_msg_req_body *msg) |
||
576 | { |
||
577 | int idx = 1; |
||
578 | |||
579 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
||
580 | idx++; |
||
581 | if (idx > raw->curlen) |
||
582 | goto fail_len; |
||
583 | |||
584 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); |
||
585 | idx += 16; |
||
586 | if (idx > raw->curlen) |
||
587 | goto fail_len; |
||
588 | |||
589 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; |
||
590 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
||
591 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; |
||
592 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; |
||
593 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); |
||
594 | idx++; |
||
595 | return true; |
||
596 | fail_len: |
||
597 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); |
||
598 | return false; |
||
599 | } |
||
600 | |||
601 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, |
||
602 | struct drm_dp_sideband_msg_req_body *msg) |
||
603 | { |
||
604 | int idx = 1; |
||
605 | |||
606 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
||
607 | idx++; |
||
608 | if (idx > raw->curlen) |
||
609 | goto fail_len; |
||
610 | |||
611 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); |
||
612 | idx += 16; |
||
613 | if (idx > raw->curlen) |
||
614 | goto fail_len; |
||
615 | |||
616 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
||
617 | idx++; |
||
618 | return true; |
||
619 | fail_len: |
||
620 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); |
||
621 | return false; |
||
622 | } |
||
623 | |||
624 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, |
||
625 | struct drm_dp_sideband_msg_req_body *msg) |
||
626 | { |
||
627 | memset(msg, 0, sizeof(*msg)); |
||
628 | msg->req_type = (raw->msg[0] & 0x7f); |
||
629 | |||
630 | switch (msg->req_type) { |
||
631 | case DP_CONNECTION_STATUS_NOTIFY: |
||
632 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); |
||
633 | case DP_RESOURCE_STATUS_NOTIFY: |
||
634 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); |
||
635 | default: |
||
636 | DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); |
||
637 | return false; |
||
638 | } |
||
639 | } |
||
640 | |||
641 | static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) |
||
642 | { |
||
643 | struct drm_dp_sideband_msg_req_body req; |
||
644 | |||
645 | req.req_type = DP_REMOTE_DPCD_WRITE; |
||
646 | req.u.dpcd_write.port_number = port_num; |
||
647 | req.u.dpcd_write.dpcd_address = offset; |
||
648 | req.u.dpcd_write.num_bytes = num_bytes; |
||
649 | req.u.dpcd_write.bytes = bytes; |
||
650 | drm_dp_encode_sideband_req(&req, msg); |
||
651 | |||
652 | return 0; |
||
653 | } |
||
654 | |||
655 | static int build_link_address(struct drm_dp_sideband_msg_tx *msg) |
||
656 | { |
||
657 | struct drm_dp_sideband_msg_req_body req; |
||
658 | |||
659 | req.req_type = DP_LINK_ADDRESS; |
||
660 | drm_dp_encode_sideband_req(&req, msg); |
||
661 | return 0; |
||
662 | } |
||
663 | |||
664 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) |
||
665 | { |
||
666 | struct drm_dp_sideband_msg_req_body req; |
||
667 | |||
668 | req.req_type = DP_ENUM_PATH_RESOURCES; |
||
669 | req.u.port_num.port_number = port_num; |
||
670 | drm_dp_encode_sideband_req(&req, msg); |
||
671 | msg->path_msg = true; |
||
672 | return 0; |
||
673 | } |
||
674 | |||
675 | static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, |
||
676 | u8 vcpi, uint16_t pbn) |
||
677 | { |
||
678 | struct drm_dp_sideband_msg_req_body req; |
||
679 | memset(&req, 0, sizeof(req)); |
||
680 | req.req_type = DP_ALLOCATE_PAYLOAD; |
||
681 | req.u.allocate_payload.port_number = port_num; |
||
682 | req.u.allocate_payload.vcpi = vcpi; |
||
683 | req.u.allocate_payload.pbn = pbn; |
||
684 | drm_dp_encode_sideband_req(&req, msg); |
||
685 | msg->path_msg = true; |
||
686 | return 0; |
||
687 | } |
||
688 | |||
689 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
||
690 | struct drm_dp_vcpi *vcpi) |
||
691 | { |
||
692 | int ret; |
||
693 | |||
694 | mutex_lock(&mgr->payload_lock); |
||
695 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); |
||
696 | if (ret > mgr->max_payloads) { |
||
697 | ret = -EINVAL; |
||
698 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); |
||
699 | goto out_unlock; |
||
700 | } |
||
701 | |||
702 | set_bit(ret, &mgr->payload_mask); |
||
703 | vcpi->vcpi = ret; |
||
704 | mgr->proposed_vcpis[ret - 1] = vcpi; |
||
705 | out_unlock: |
||
706 | mutex_unlock(&mgr->payload_lock); |
||
707 | return ret; |
||
708 | } |
||
709 | |||
710 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
||
711 | int id) |
||
712 | { |
||
713 | if (id == 0) |
||
714 | return; |
||
715 | |||
716 | mutex_lock(&mgr->payload_lock); |
||
717 | DRM_DEBUG_KMS("putting payload %d\n", id); |
||
718 | clear_bit(id, &mgr->payload_mask); |
||
719 | mgr->proposed_vcpis[id - 1] = NULL; |
||
720 | mutex_unlock(&mgr->payload_lock); |
||
721 | } |
||
722 | |||
723 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, |
||
724 | struct drm_dp_sideband_msg_tx *txmsg) |
||
725 | { |
||
726 | bool ret; |
||
727 | mutex_lock(&mgr->qlock); |
||
728 | ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || |
||
729 | txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); |
||
730 | mutex_unlock(&mgr->qlock); |
||
731 | return ret; |
||
732 | } |
||
733 | |||
734 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, |
||
735 | struct drm_dp_sideband_msg_tx *txmsg) |
||
736 | { |
||
737 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
||
738 | int ret; |
||
739 | |||
740 | ret = wait_event_timeout(mgr->tx_waitq, |
||
741 | check_txmsg_state(mgr, txmsg), |
||
742 | (4 * HZ)); |
||
743 | mutex_lock(&mstb->mgr->qlock); |
||
744 | if (ret > 0) { |
||
745 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { |
||
746 | ret = -EIO; |
||
747 | goto out; |
||
748 | } |
||
749 | } else { |
||
750 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); |
||
751 | |||
752 | /* dump some state */ |
||
753 | ret = -EIO; |
||
754 | |||
755 | /* remove from q */ |
||
756 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || |
||
757 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { |
||
758 | list_del(&txmsg->next); |
||
759 | } |
||
760 | |||
761 | if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || |
||
762 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { |
||
763 | mstb->tx_slots[txmsg->seqno] = NULL; |
||
764 | } |
||
765 | } |
||
766 | out: |
||
767 | mutex_unlock(&mgr->qlock); |
||
768 | |||
769 | return ret; |
||
770 | } |
||
771 | |||
772 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) |
||
773 | { |
||
774 | struct drm_dp_mst_branch *mstb; |
||
775 | |||
776 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); |
||
777 | if (!mstb) |
||
778 | return NULL; |
||
779 | |||
780 | mstb->lct = lct; |
||
781 | if (lct > 1) |
||
782 | memcpy(mstb->rad, rad, lct / 2); |
||
783 | INIT_LIST_HEAD(&mstb->ports); |
||
784 | kref_init(&mstb->kref); |
||
785 | return mstb; |
||
786 | } |
||
787 | |||
788 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
||
789 | { |
||
790 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); |
||
791 | struct drm_dp_mst_port *port, *tmp; |
||
792 | bool wake_tx = false; |
||
793 | |||
794 | cancel_work_sync(&mstb->mgr->work); |
||
795 | |||
796 | /* |
||
797 | * destroy all ports - don't need lock |
||
798 | * as there are no more references to the mst branch |
||
799 | * device at this point. |
||
800 | */ |
||
801 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { |
||
802 | list_del(&port->next); |
||
803 | drm_dp_put_port(port); |
||
804 | } |
||
805 | |||
806 | /* drop any tx slots msg */ |
||
807 | mutex_lock(&mstb->mgr->qlock); |
||
808 | if (mstb->tx_slots[0]) { |
||
809 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
810 | mstb->tx_slots[0] = NULL; |
||
811 | wake_tx = true; |
||
812 | } |
||
813 | if (mstb->tx_slots[1]) { |
||
814 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
815 | mstb->tx_slots[1] = NULL; |
||
816 | wake_tx = true; |
||
817 | } |
||
818 | mutex_unlock(&mstb->mgr->qlock); |
||
819 | |||
820 | // if (wake_tx) |
||
821 | // wake_up(&mstb->mgr->tx_waitq); |
||
822 | kfree(mstb); |
||
823 | } |
||
824 | |||
825 | static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) |
||
826 | { |
||
827 | kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); |
||
828 | } |
||
829 | |||
830 | |||
831 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) |
||
832 | { |
||
833 | switch (old_pdt) { |
||
834 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
835 | case DP_PEER_DEVICE_SST_SINK: |
||
836 | /* remove i2c over sideband */ |
||
837 | drm_dp_mst_unregister_i2c_bus(&port->aux); |
||
838 | break; |
||
839 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
840 | drm_dp_put_mst_branch_device(port->mstb); |
||
841 | port->mstb = NULL; |
||
842 | break; |
||
843 | } |
||
844 | } |
||
845 | |||
846 | static void drm_dp_destroy_port(struct kref *kref) |
||
847 | { |
||
848 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); |
||
849 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
||
850 | if (!port->input) { |
||
851 | port->vcpi.num_slots = 0; |
||
852 | if (port->connector) |
||
853 | (*port->mgr->cbs->destroy_connector)(mgr, port->connector); |
||
854 | drm_dp_port_teardown_pdt(port, port->pdt); |
||
855 | |||
856 | if (!port->input && port->vcpi.vcpi > 0) |
||
857 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); |
||
858 | } |
||
859 | kfree(port); |
||
860 | |||
861 | (*mgr->cbs->hotplug)(mgr); |
||
862 | } |
||
863 | |||
864 | static void drm_dp_put_port(struct drm_dp_mst_port *port) |
||
865 | { |
||
866 | kref_put(&port->kref, drm_dp_destroy_port); |
||
867 | } |
||
868 | |||
869 | 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) |
||
870 | { |
||
871 | struct drm_dp_mst_port *port; |
||
872 | struct drm_dp_mst_branch *rmstb; |
||
873 | if (to_find == mstb) { |
||
874 | kref_get(&mstb->kref); |
||
875 | return mstb; |
||
876 | } |
||
877 | list_for_each_entry(port, &mstb->ports, next) { |
||
878 | if (port->mstb) { |
||
879 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); |
||
880 | if (rmstb) |
||
881 | return rmstb; |
||
882 | } |
||
883 | } |
||
884 | return NULL; |
||
885 | } |
||
886 | |||
887 | 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) |
||
888 | { |
||
889 | struct drm_dp_mst_branch *rmstb = NULL; |
||
890 | mutex_lock(&mgr->lock); |
||
891 | if (mgr->mst_primary) |
||
892 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); |
||
893 | mutex_unlock(&mgr->lock); |
||
894 | return rmstb; |
||
895 | } |
||
896 | |||
897 | 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) |
||
898 | { |
||
899 | struct drm_dp_mst_port *port, *mport; |
||
900 | |||
901 | list_for_each_entry(port, &mstb->ports, next) { |
||
902 | if (port == to_find) { |
||
903 | kref_get(&port->kref); |
||
904 | return port; |
||
905 | } |
||
906 | if (port->mstb) { |
||
907 | mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); |
||
908 | if (mport) |
||
909 | return mport; |
||
910 | } |
||
911 | } |
||
912 | return NULL; |
||
913 | } |
||
914 | |||
915 | 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) |
||
916 | { |
||
917 | struct drm_dp_mst_port *rport = NULL; |
||
918 | mutex_lock(&mgr->lock); |
||
919 | if (mgr->mst_primary) |
||
920 | rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); |
||
921 | mutex_unlock(&mgr->lock); |
||
922 | return rport; |
||
923 | } |
||
924 | |||
925 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) |
||
926 | { |
||
927 | struct drm_dp_mst_port *port; |
||
928 | |||
929 | list_for_each_entry(port, &mstb->ports, next) { |
||
930 | if (port->port_num == port_num) { |
||
931 | kref_get(&port->kref); |
||
932 | return port; |
||
933 | } |
||
934 | } |
||
935 | |||
936 | return NULL; |
||
937 | } |
||
938 | |||
939 | /* |
||
940 | * calculate a new RAD for this MST branch device |
||
941 | * if parent has an LCT of 2 then it has 1 nibble of RAD, |
||
942 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, |
||
943 | */ |
||
944 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, |
||
945 | u8 *rad) |
||
946 | { |
||
947 | int lct = port->parent->lct; |
||
948 | int shift = 4; |
||
949 | int idx = lct / 2; |
||
950 | if (lct > 1) { |
||
951 | memcpy(rad, port->parent->rad, idx); |
||
952 | shift = (lct % 2) ? 4 : 0; |
||
953 | } else |
||
954 | rad[0] = 0; |
||
955 | |||
956 | rad[idx] |= port->port_num << shift; |
||
957 | return lct + 1; |
||
958 | } |
||
959 | |||
960 | /* |
||
961 | * return sends link address for new mstb |
||
962 | */ |
||
963 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) |
||
964 | { |
||
965 | int ret; |
||
966 | u8 rad[6], lct; |
||
967 | bool send_link = false; |
||
968 | switch (port->pdt) { |
||
969 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
970 | case DP_PEER_DEVICE_SST_SINK: |
||
971 | /* add i2c over sideband */ |
||
972 | ret = drm_dp_mst_register_i2c_bus(&port->aux); |
||
973 | break; |
||
974 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
975 | lct = drm_dp_calculate_rad(port, rad); |
||
976 | |||
977 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); |
||
978 | port->mstb->mgr = port->mgr; |
||
979 | port->mstb->port_parent = port; |
||
980 | |||
981 | send_link = true; |
||
982 | break; |
||
983 | } |
||
984 | return send_link; |
||
985 | } |
||
986 | |||
987 | static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb, |
||
988 | struct drm_dp_mst_port *port) |
||
989 | { |
||
990 | int ret; |
||
991 | if (port->dpcd_rev >= 0x12) { |
||
992 | port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid); |
||
993 | if (!port->guid_valid) { |
||
994 | ret = drm_dp_send_dpcd_write(mstb->mgr, |
||
995 | port, |
||
996 | DP_GUID, |
||
997 | 16, port->guid); |
||
998 | port->guid_valid = true; |
||
999 | } |
||
1000 | } |
||
1001 | } |
||
1002 | |||
1003 | static void build_mst_prop_path(struct drm_dp_mst_port *port, |
||
1004 | struct drm_dp_mst_branch *mstb, |
||
1005 | char *proppath) |
||
1006 | { |
||
1007 | int i; |
||
1008 | char temp[8]; |
||
1009 | snprintf(proppath, 255, "mst:%d", mstb->mgr->conn_base_id); |
||
1010 | for (i = 0; i < (mstb->lct - 1); i++) { |
||
1011 | int shift = (i % 2) ? 0 : 4; |
||
1012 | int port_num = mstb->rad[i / 2] >> shift; |
||
1013 | snprintf(temp, 8, "-%d", port_num); |
||
1014 | strncat(proppath, temp, 255); |
||
1015 | } |
||
1016 | snprintf(temp, 8, "-%d", port->port_num); |
||
1017 | strncat(proppath, temp, 255); |
||
1018 | } |
||
1019 | |||
1020 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, |
||
1021 | struct device *dev, |
||
1022 | struct drm_dp_link_addr_reply_port *port_msg) |
||
1023 | { |
||
1024 | struct drm_dp_mst_port *port; |
||
1025 | bool ret; |
||
1026 | bool created = false; |
||
1027 | int old_pdt = 0; |
||
1028 | int old_ddps = 0; |
||
1029 | port = drm_dp_get_port(mstb, port_msg->port_number); |
||
1030 | if (!port) { |
||
1031 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
||
1032 | if (!port) |
||
1033 | return; |
||
1034 | kref_init(&port->kref); |
||
1035 | port->parent = mstb; |
||
1036 | port->port_num = port_msg->port_number; |
||
1037 | port->mgr = mstb->mgr; |
||
1038 | port->aux.name = "DPMST"; |
||
1039 | port->aux.dev = dev; |
||
1040 | created = true; |
||
1041 | } else { |
||
1042 | old_pdt = port->pdt; |
||
1043 | old_ddps = port->ddps; |
||
1044 | } |
||
1045 | |||
1046 | port->pdt = port_msg->peer_device_type; |
||
1047 | port->input = port_msg->input_port; |
||
1048 | port->mcs = port_msg->mcs; |
||
1049 | port->ddps = port_msg->ddps; |
||
1050 | port->ldps = port_msg->legacy_device_plug_status; |
||
1051 | port->dpcd_rev = port_msg->dpcd_revision; |
||
1052 | port->num_sdp_streams = port_msg->num_sdp_streams; |
||
1053 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; |
||
1054 | memcpy(port->guid, port_msg->peer_guid, 16); |
||
1055 | |||
1056 | /* manage mstb port lists with mgr lock - take a reference |
||
1057 | for this list */ |
||
1058 | if (created) { |
||
1059 | mutex_lock(&mstb->mgr->lock); |
||
1060 | kref_get(&port->kref); |
||
1061 | list_add(&port->next, &mstb->ports); |
||
1062 | mutex_unlock(&mstb->mgr->lock); |
||
1063 | } |
||
1064 | |||
1065 | if (old_ddps != port->ddps) { |
||
1066 | if (port->ddps) { |
||
1067 | drm_dp_check_port_guid(mstb, port); |
||
1068 | if (!port->input) |
||
1069 | drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); |
||
1070 | } else { |
||
1071 | port->guid_valid = false; |
||
1072 | port->available_pbn = 0; |
||
1073 | } |
||
1074 | } |
||
1075 | |||
1076 | if (old_pdt != port->pdt && !port->input) { |
||
1077 | drm_dp_port_teardown_pdt(port, old_pdt); |
||
1078 | |||
1079 | ret = drm_dp_port_setup_pdt(port); |
||
1080 | if (ret == true) { |
||
1081 | drm_dp_send_link_address(mstb->mgr, port->mstb); |
||
1082 | port->mstb->link_address_sent = true; |
||
1083 | } |
||
1084 | } |
||
1085 | |||
1086 | if (created && !port->input) { |
||
1087 | char proppath[255]; |
||
1088 | build_mst_prop_path(port, mstb, proppath); |
||
1089 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); |
||
1090 | } |
||
1091 | |||
1092 | /* put reference to this port */ |
||
1093 | drm_dp_put_port(port); |
||
1094 | } |
||
1095 | |||
1096 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, |
||
1097 | struct drm_dp_connection_status_notify *conn_stat) |
||
1098 | { |
||
1099 | struct drm_dp_mst_port *port; |
||
1100 | int old_pdt; |
||
1101 | int old_ddps; |
||
1102 | bool dowork = false; |
||
1103 | port = drm_dp_get_port(mstb, conn_stat->port_number); |
||
1104 | if (!port) |
||
1105 | return; |
||
1106 | |||
1107 | old_ddps = port->ddps; |
||
1108 | old_pdt = port->pdt; |
||
1109 | port->pdt = conn_stat->peer_device_type; |
||
1110 | port->mcs = conn_stat->message_capability_status; |
||
1111 | port->ldps = conn_stat->legacy_device_plug_status; |
||
1112 | port->ddps = conn_stat->displayport_device_plug_status; |
||
1113 | |||
1114 | if (old_ddps != port->ddps) { |
||
1115 | if (port->ddps) { |
||
1116 | drm_dp_check_port_guid(mstb, port); |
||
1117 | dowork = true; |
||
1118 | } else { |
||
1119 | port->guid_valid = false; |
||
1120 | port->available_pbn = 0; |
||
1121 | } |
||
1122 | } |
||
1123 | if (old_pdt != port->pdt && !port->input) { |
||
1124 | drm_dp_port_teardown_pdt(port, old_pdt); |
||
1125 | |||
1126 | if (drm_dp_port_setup_pdt(port)) |
||
1127 | dowork = true; |
||
1128 | } |
||
1129 | |||
1130 | drm_dp_put_port(port); |
||
1131 | // if (dowork) |
||
1132 | // queue_work(system_long_wq, &mstb->mgr->work); |
||
1133 | |||
1134 | } |
||
1135 | |||
1136 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, |
||
1137 | u8 lct, u8 *rad) |
||
1138 | { |
||
1139 | struct drm_dp_mst_branch *mstb; |
||
1140 | struct drm_dp_mst_port *port; |
||
1141 | int i; |
||
1142 | /* find the port by iterating down */ |
||
1143 | mstb = mgr->mst_primary; |
||
1144 | |||
1145 | for (i = 0; i < lct - 1; i++) { |
||
1146 | int shift = (i % 2) ? 0 : 4; |
||
1147 | int port_num = rad[i / 2] >> shift; |
||
1148 | |||
1149 | list_for_each_entry(port, &mstb->ports, next) { |
||
1150 | if (port->port_num == port_num) { |
||
1151 | if (!port->mstb) { |
||
1152 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
||
1153 | return NULL; |
||
1154 | } |
||
1155 | |||
1156 | mstb = port->mstb; |
||
1157 | break; |
||
1158 | } |
||
1159 | } |
||
1160 | } |
||
1161 | kref_get(&mstb->kref); |
||
1162 | return mstb; |
||
1163 | } |
||
1164 | |||
1165 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
||
1166 | struct drm_dp_mst_branch *mstb) |
||
1167 | { |
||
1168 | struct drm_dp_mst_port *port; |
||
1169 | |||
1170 | if (!mstb->link_address_sent) { |
||
1171 | drm_dp_send_link_address(mgr, mstb); |
||
1172 | mstb->link_address_sent = true; |
||
1173 | } |
||
1174 | list_for_each_entry(port, &mstb->ports, next) { |
||
1175 | if (port->input) |
||
1176 | continue; |
||
1177 | |||
1178 | if (!port->ddps) |
||
1179 | continue; |
||
1180 | |||
1181 | if (!port->available_pbn) |
||
1182 | drm_dp_send_enum_path_resources(mgr, mstb, port); |
||
1183 | |||
1184 | if (port->mstb) |
||
1185 | drm_dp_check_and_send_link_address(mgr, port->mstb); |
||
1186 | } |
||
1187 | } |
||
1188 | |||
1189 | static void drm_dp_mst_link_probe_work(struct work_struct *work) |
||
1190 | { |
||
1191 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); |
||
1192 | |||
1193 | drm_dp_check_and_send_link_address(mgr, mgr->mst_primary); |
||
1194 | |||
1195 | } |
||
1196 | |||
1197 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
||
1198 | u8 *guid) |
||
1199 | { |
||
1200 | static u8 zero_guid[16]; |
||
1201 | |||
1202 | if (!memcmp(guid, zero_guid, 16)) { |
||
1203 | u64 salt = get_jiffies_64(); |
||
1204 | memcpy(&guid[0], &salt, sizeof(u64)); |
||
1205 | memcpy(&guid[8], &salt, sizeof(u64)); |
||
1206 | return false; |
||
1207 | } |
||
1208 | return true; |
||
1209 | } |
||
1210 | |||
1211 | #if 0 |
||
1212 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) |
||
1213 | { |
||
1214 | struct drm_dp_sideband_msg_req_body req; |
||
1215 | |||
1216 | req.req_type = DP_REMOTE_DPCD_READ; |
||
1217 | req.u.dpcd_read.port_number = port_num; |
||
1218 | req.u.dpcd_read.dpcd_address = offset; |
||
1219 | req.u.dpcd_read.num_bytes = num_bytes; |
||
1220 | drm_dp_encode_sideband_req(&req, msg); |
||
1221 | |||
1222 | return 0; |
||
1223 | } |
||
1224 | #endif |
||
1225 | |||
1226 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, |
||
1227 | bool up, u8 *msg, int len) |
||
1228 | { |
||
1229 | int ret; |
||
1230 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; |
||
1231 | int tosend, total, offset; |
||
1232 | int retries = 0; |
||
1233 | |||
1234 | retry: |
||
1235 | total = len; |
||
1236 | offset = 0; |
||
1237 | do { |
||
1238 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); |
||
1239 | |||
1240 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, |
||
1241 | &msg[offset], |
||
1242 | tosend); |
||
1243 | if (ret != tosend) { |
||
1244 | if (ret == -EIO && retries < 5) { |
||
1245 | retries++; |
||
1246 | goto retry; |
||
1247 | } |
||
1248 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); |
||
1249 | WARN(1, "fail\n"); |
||
1250 | |||
1251 | return -EIO; |
||
1252 | } |
||
1253 | offset += tosend; |
||
1254 | total -= tosend; |
||
1255 | } while (total > 0); |
||
1256 | return 0; |
||
1257 | } |
||
1258 | |||
1259 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, |
||
1260 | struct drm_dp_sideband_msg_tx *txmsg) |
||
1261 | { |
||
1262 | struct drm_dp_mst_branch *mstb = txmsg->dst; |
||
1263 | |||
1264 | /* both msg slots are full */ |
||
1265 | if (txmsg->seqno == -1) { |
||
1266 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { |
||
1267 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); |
||
1268 | return -EAGAIN; |
||
1269 | } |
||
1270 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { |
||
1271 | txmsg->seqno = mstb->last_seqno; |
||
1272 | mstb->last_seqno ^= 1; |
||
1273 | } else if (mstb->tx_slots[0] == NULL) |
||
1274 | txmsg->seqno = 0; |
||
1275 | else |
||
1276 | txmsg->seqno = 1; |
||
1277 | mstb->tx_slots[txmsg->seqno] = txmsg; |
||
1278 | } |
||
1279 | hdr->broadcast = 0; |
||
1280 | hdr->path_msg = txmsg->path_msg; |
||
1281 | hdr->lct = mstb->lct; |
||
1282 | hdr->lcr = mstb->lct - 1; |
||
1283 | if (mstb->lct > 1) |
||
1284 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); |
||
1285 | hdr->seqno = txmsg->seqno; |
||
1286 | return 0; |
||
1287 | } |
||
1288 | /* |
||
1289 | * process a single block of the next message in the sideband queue |
||
1290 | */ |
||
1291 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
||
1292 | struct drm_dp_sideband_msg_tx *txmsg, |
||
1293 | bool up) |
||
1294 | { |
||
1295 | u8 chunk[48]; |
||
1296 | struct drm_dp_sideband_msg_hdr hdr; |
||
1297 | int len, space, idx, tosend; |
||
1298 | int ret; |
||
1299 | |||
1300 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
||
1301 | |||
1302 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
||
1303 | txmsg->seqno = -1; |
||
1304 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; |
||
1305 | } |
||
1306 | |||
1307 | /* make hdr from dst mst - for replies use seqno |
||
1308 | otherwise assign one */ |
||
1309 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
||
1310 | if (ret < 0) |
||
1311 | return ret; |
||
1312 | |||
1313 | /* amount left to send in this message */ |
||
1314 | len = txmsg->cur_len - txmsg->cur_offset; |
||
1315 | |||
1316 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ |
||
1317 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); |
||
1318 | |||
1319 | tosend = min(len, space); |
||
1320 | if (len == txmsg->cur_len) |
||
1321 | hdr.somt = 1; |
||
1322 | if (space >= len) |
||
1323 | hdr.eomt = 1; |
||
1324 | |||
1325 | |||
1326 | hdr.msg_len = tosend + 1; |
||
1327 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); |
||
1328 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); |
||
1329 | /* add crc at end */ |
||
1330 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); |
||
1331 | idx += tosend + 1; |
||
1332 | |||
1333 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); |
||
1334 | if (ret) { |
||
1335 | DRM_DEBUG_KMS("sideband msg failed to send\n"); |
||
1336 | return ret; |
||
1337 | } |
||
1338 | |||
1339 | txmsg->cur_offset += tosend; |
||
1340 | if (txmsg->cur_offset == txmsg->cur_len) { |
||
1341 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; |
||
1342 | return 1; |
||
1343 | } |
||
1344 | return 0; |
||
1345 | } |
||
1346 | |||
1347 | /* must be called holding qlock */ |
||
1348 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
||
1349 | { |
||
1350 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1351 | int ret; |
||
1352 | |||
1353 | /* construct a chunk from the first msg in the tx_msg queue */ |
||
1354 | if (list_empty(&mgr->tx_msg_downq)) { |
||
1355 | mgr->tx_down_in_progress = false; |
||
1356 | return; |
||
1357 | } |
||
1358 | mgr->tx_down_in_progress = true; |
||
1359 | |||
1360 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); |
||
1361 | ret = process_single_tx_qlock(mgr, txmsg, false); |
||
1362 | if (ret == 1) { |
||
1363 | /* txmsg is sent it should be in the slots now */ |
||
1364 | list_del(&txmsg->next); |
||
1365 | } else if (ret) { |
||
1366 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
||
1367 | list_del(&txmsg->next); |
||
1368 | if (txmsg->seqno != -1) |
||
1369 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
||
1370 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
||
1371 | // wake_up(&mgr->tx_waitq); |
||
1372 | } |
||
1373 | if (list_empty(&mgr->tx_msg_downq)) { |
||
1374 | mgr->tx_down_in_progress = false; |
||
1375 | return; |
||
1376 | } |
||
1377 | } |
||
1378 | |||
1379 | /* called holding qlock */ |
||
1380 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
||
1381 | { |
||
1382 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1383 | int ret; |
||
1384 | |||
1385 | /* construct a chunk from the first msg in the tx_msg queue */ |
||
1386 | if (list_empty(&mgr->tx_msg_upq)) { |
||
1387 | mgr->tx_up_in_progress = false; |
||
1388 | return; |
||
1389 | } |
||
1390 | |||
1391 | txmsg = list_first_entry(&mgr->tx_msg_upq, struct drm_dp_sideband_msg_tx, next); |
||
1392 | ret = process_single_tx_qlock(mgr, txmsg, true); |
||
1393 | if (ret == 1) { |
||
1394 | /* up txmsgs aren't put in slots - so free after we send it */ |
||
1395 | list_del(&txmsg->next); |
||
1396 | kfree(txmsg); |
||
1397 | } else if (ret) |
||
1398 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
||
1399 | mgr->tx_up_in_progress = true; |
||
1400 | } |
||
1401 | |||
1402 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
||
1403 | struct drm_dp_sideband_msg_tx *txmsg) |
||
1404 | { |
||
1405 | mutex_lock(&mgr->qlock); |
||
1406 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); |
||
1407 | if (!mgr->tx_down_in_progress) |
||
1408 | process_single_down_tx_qlock(mgr); |
||
1409 | mutex_unlock(&mgr->qlock); |
||
1410 | } |
||
1411 | |||
1412 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
||
1413 | struct drm_dp_mst_branch *mstb) |
||
1414 | { |
||
1415 | int len; |
||
1416 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1417 | int ret; |
||
1418 | |||
1419 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1420 | if (!txmsg) |
||
1421 | return -ENOMEM; |
||
1422 | |||
1423 | txmsg->dst = mstb; |
||
1424 | len = build_link_address(txmsg); |
||
1425 | |||
1426 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1427 | |||
1428 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1429 | if (ret > 0) { |
||
1430 | int i; |
||
1431 | |||
1432 | if (txmsg->reply.reply_type == 1) |
||
1433 | DRM_DEBUG_KMS("link address nak received\n"); |
||
1434 | else { |
||
1435 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); |
||
1436 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
||
1437 | 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, |
||
1438 | txmsg->reply.u.link_addr.ports[i].input_port, |
||
1439 | txmsg->reply.u.link_addr.ports[i].peer_device_type, |
||
1440 | txmsg->reply.u.link_addr.ports[i].port_number, |
||
1441 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, |
||
1442 | txmsg->reply.u.link_addr.ports[i].mcs, |
||
1443 | txmsg->reply.u.link_addr.ports[i].ddps, |
||
1444 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, |
||
1445 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, |
||
1446 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); |
||
1447 | } |
||
1448 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
||
1449 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); |
||
1450 | } |
||
1451 | (*mgr->cbs->hotplug)(mgr); |
||
1452 | } |
||
1453 | } else |
||
1454 | DRM_DEBUG_KMS("link address failed %d\n", ret); |
||
1455 | |||
1456 | kfree(txmsg); |
||
1457 | return 0; |
||
1458 | } |
||
1459 | |||
1460 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
||
1461 | struct drm_dp_mst_branch *mstb, |
||
1462 | struct drm_dp_mst_port *port) |
||
1463 | { |
||
1464 | int len; |
||
1465 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1466 | int ret; |
||
1467 | |||
1468 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1469 | if (!txmsg) |
||
1470 | return -ENOMEM; |
||
1471 | |||
1472 | txmsg->dst = mstb; |
||
1473 | len = build_enum_path_resources(txmsg, port->port_num); |
||
1474 | |||
1475 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1476 | |||
1477 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1478 | if (ret > 0) { |
||
1479 | if (txmsg->reply.reply_type == 1) |
||
1480 | DRM_DEBUG_KMS("enum path resources nak received\n"); |
||
1481 | else { |
||
1482 | if (port->port_num != txmsg->reply.u.path_resources.port_number) |
||
1483 | DRM_ERROR("got incorrect port in response\n"); |
||
1484 | 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, |
||
1485 | txmsg->reply.u.path_resources.avail_payload_bw_number); |
||
1486 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; |
||
1487 | } |
||
1488 | } |
||
1489 | |||
1490 | kfree(txmsg); |
||
1491 | return 0; |
||
1492 | } |
||
1493 | |||
1494 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
||
1495 | struct drm_dp_mst_port *port, |
||
1496 | int id, |
||
1497 | int pbn) |
||
1498 | { |
||
1499 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1500 | struct drm_dp_mst_branch *mstb; |
||
1501 | int len, ret; |
||
1502 | |||
1503 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
1504 | if (!mstb) |
||
1505 | return -EINVAL; |
||
1506 | |||
1507 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1508 | if (!txmsg) { |
||
1509 | ret = -ENOMEM; |
||
1510 | goto fail_put; |
||
1511 | } |
||
1512 | |||
1513 | txmsg->dst = mstb; |
||
1514 | len = build_allocate_payload(txmsg, port->port_num, |
||
1515 | id, |
||
1516 | pbn); |
||
1517 | |||
1518 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1519 | |||
1520 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1521 | if (ret > 0) { |
||
1522 | if (txmsg->reply.reply_type == 1) { |
||
1523 | ret = -EINVAL; |
||
1524 | } else |
||
1525 | ret = 0; |
||
1526 | } |
||
1527 | kfree(txmsg); |
||
1528 | fail_put: |
||
1529 | drm_dp_put_mst_branch_device(mstb); |
||
1530 | return ret; |
||
1531 | } |
||
1532 | |||
1533 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
||
1534 | int id, |
||
1535 | struct drm_dp_payload *payload) |
||
1536 | { |
||
1537 | int ret; |
||
1538 | |||
1539 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); |
||
1540 | if (ret < 0) { |
||
1541 | payload->payload_state = 0; |
||
1542 | return ret; |
||
1543 | } |
||
1544 | payload->payload_state = DP_PAYLOAD_LOCAL; |
||
1545 | return 0; |
||
1546 | } |
||
1547 | |||
1548 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
||
1549 | struct drm_dp_mst_port *port, |
||
1550 | int id, |
||
1551 | struct drm_dp_payload *payload) |
||
1552 | { |
||
1553 | int ret; |
||
1554 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); |
||
1555 | if (ret < 0) |
||
1556 | return ret; |
||
1557 | payload->payload_state = DP_PAYLOAD_REMOTE; |
||
1558 | return ret; |
||
1559 | } |
||
1560 | |||
1561 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
||
1562 | struct drm_dp_mst_port *port, |
||
1563 | int id, |
||
1564 | struct drm_dp_payload *payload) |
||
1565 | { |
||
1566 | DRM_DEBUG_KMS("\n"); |
||
1567 | /* its okay for these to fail */ |
||
1568 | if (port) { |
||
1569 | drm_dp_payload_send_msg(mgr, port, id, 0); |
||
1570 | } |
||
1571 | |||
1572 | drm_dp_dpcd_write_payload(mgr, id, payload); |
||
1573 | payload->payload_state = 0; |
||
1574 | return 0; |
||
1575 | } |
||
1576 | |||
1577 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
||
1578 | int id, |
||
1579 | struct drm_dp_payload *payload) |
||
1580 | { |
||
1581 | payload->payload_state = 0; |
||
1582 | return 0; |
||
1583 | } |
||
1584 | |||
1585 | /** |
||
1586 | * drm_dp_update_payload_part1() - Execute payload update part 1 |
||
1587 | * @mgr: manager to use. |
||
1588 | * |
||
1589 | * This iterates over all proposed virtual channels, and tries to |
||
1590 | * allocate space in the link for them. For 0->slots transitions, |
||
1591 | * this step just writes the VCPI to the MST device. For slots->0 |
||
1592 | * transitions, this writes the updated VCPIs and removes the |
||
1593 | * remote VC payloads. |
||
1594 | * |
||
1595 | * after calling this the driver should generate ACT and payload |
||
1596 | * packets. |
||
1597 | */ |
||
1598 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) |
||
1599 | { |
||
1600 | int i; |
||
1601 | int cur_slots = 1; |
||
1602 | struct drm_dp_payload req_payload; |
||
1603 | struct drm_dp_mst_port *port; |
||
1604 | |||
1605 | mutex_lock(&mgr->payload_lock); |
||
1606 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1607 | /* solve the current payloads - compare to the hw ones |
||
1608 | - update the hw view */ |
||
1609 | req_payload.start_slot = cur_slots; |
||
1610 | if (mgr->proposed_vcpis[i]) { |
||
1611 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
||
1612 | req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; |
||
1613 | } else { |
||
1614 | port = NULL; |
||
1615 | req_payload.num_slots = 0; |
||
1616 | } |
||
1617 | /* work out what is required to happen with this payload */ |
||
1618 | if (mgr->payloads[i].start_slot != req_payload.start_slot || |
||
1619 | mgr->payloads[i].num_slots != req_payload.num_slots) { |
||
1620 | |||
1621 | /* need to push an update for this payload */ |
||
1622 | if (req_payload.num_slots) { |
||
1623 | drm_dp_create_payload_step1(mgr, i + 1, &req_payload); |
||
1624 | mgr->payloads[i].num_slots = req_payload.num_slots; |
||
1625 | } else if (mgr->payloads[i].num_slots) { |
||
1626 | mgr->payloads[i].num_slots = 0; |
||
1627 | drm_dp_destroy_payload_step1(mgr, port, i + 1, &mgr->payloads[i]); |
||
1628 | req_payload.payload_state = mgr->payloads[i].payload_state; |
||
1629 | } else |
||
1630 | req_payload.payload_state = 0; |
||
1631 | |||
1632 | mgr->payloads[i].start_slot = req_payload.start_slot; |
||
1633 | mgr->payloads[i].payload_state = req_payload.payload_state; |
||
1634 | } |
||
1635 | cur_slots += req_payload.num_slots; |
||
1636 | } |
||
1637 | mutex_unlock(&mgr->payload_lock); |
||
1638 | |||
1639 | return 0; |
||
1640 | } |
||
1641 | EXPORT_SYMBOL(drm_dp_update_payload_part1); |
||
1642 | |||
1643 | /** |
||
1644 | * drm_dp_update_payload_part2() - Execute payload update part 2 |
||
1645 | * @mgr: manager to use. |
||
1646 | * |
||
1647 | * This iterates over all proposed virtual channels, and tries to |
||
1648 | * allocate space in the link for them. For 0->slots transitions, |
||
1649 | * this step writes the remote VC payload commands. For slots->0 |
||
1650 | * this just resets some internal state. |
||
1651 | */ |
||
1652 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) |
||
1653 | { |
||
1654 | struct drm_dp_mst_port *port; |
||
1655 | int i; |
||
1656 | int ret = 0; |
||
1657 | mutex_lock(&mgr->payload_lock); |
||
1658 | for (i = 0; i < mgr->max_payloads; i++) { |
||
1659 | |||
1660 | if (!mgr->proposed_vcpis[i]) |
||
1661 | continue; |
||
1662 | |||
1663 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
||
1664 | |||
1665 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); |
||
1666 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { |
||
1667 | ret = drm_dp_create_payload_step2(mgr, port, i + 1, &mgr->payloads[i]); |
||
1668 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
||
1669 | ret = drm_dp_destroy_payload_step2(mgr, i + 1, &mgr->payloads[i]); |
||
1670 | } |
||
1671 | if (ret) { |
||
1672 | mutex_unlock(&mgr->payload_lock); |
||
1673 | return ret; |
||
1674 | } |
||
1675 | } |
||
1676 | mutex_unlock(&mgr->payload_lock); |
||
1677 | return 0; |
||
1678 | } |
||
1679 | EXPORT_SYMBOL(drm_dp_update_payload_part2); |
||
1680 | |||
1681 | #if 0 /* unused as of yet */ |
||
1682 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
||
1683 | struct drm_dp_mst_port *port, |
||
1684 | int offset, int size) |
||
1685 | { |
||
1686 | int len; |
||
1687 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1688 | |||
1689 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1690 | if (!txmsg) |
||
1691 | return -ENOMEM; |
||
1692 | |||
1693 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); |
||
1694 | txmsg->dst = port->parent; |
||
1695 | |||
1696 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1697 | |||
1698 | return 0; |
||
1699 | } |
||
1700 | #endif |
||
1701 | |||
1702 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
||
1703 | struct drm_dp_mst_port *port, |
||
1704 | int offset, int size, u8 *bytes) |
||
1705 | { |
||
1706 | int len; |
||
1707 | int ret; |
||
1708 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1709 | struct drm_dp_mst_branch *mstb; |
||
1710 | |||
1711 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
1712 | if (!mstb) |
||
1713 | return -EINVAL; |
||
1714 | |||
1715 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1716 | if (!txmsg) { |
||
1717 | ret = -ENOMEM; |
||
1718 | goto fail_put; |
||
1719 | } |
||
1720 | |||
1721 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
||
1722 | txmsg->dst = mstb; |
||
1723 | |||
1724 | drm_dp_queue_down_tx(mgr, txmsg); |
||
1725 | |||
1726 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
1727 | if (ret > 0) { |
||
1728 | if (txmsg->reply.reply_type == 1) { |
||
1729 | ret = -EINVAL; |
||
1730 | } else |
||
1731 | ret = 0; |
||
1732 | } |
||
1733 | kfree(txmsg); |
||
1734 | fail_put: |
||
1735 | drm_dp_put_mst_branch_device(mstb); |
||
1736 | return ret; |
||
1737 | } |
||
1738 | |||
1739 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) |
||
1740 | { |
||
1741 | struct drm_dp_sideband_msg_reply_body reply; |
||
1742 | |||
1743 | reply.reply_type = 1; |
||
1744 | reply.req_type = req_type; |
||
1745 | drm_dp_encode_sideband_reply(&reply, msg); |
||
1746 | return 0; |
||
1747 | } |
||
1748 | |||
1749 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, |
||
1750 | struct drm_dp_mst_branch *mstb, |
||
1751 | int req_type, int seqno, bool broadcast) |
||
1752 | { |
||
1753 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1754 | |||
1755 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
1756 | if (!txmsg) |
||
1757 | return -ENOMEM; |
||
1758 | |||
1759 | txmsg->dst = mstb; |
||
1760 | txmsg->seqno = seqno; |
||
1761 | drm_dp_encode_up_ack_reply(txmsg, req_type); |
||
1762 | |||
1763 | mutex_lock(&mgr->qlock); |
||
1764 | list_add_tail(&txmsg->next, &mgr->tx_msg_upq); |
||
1765 | if (!mgr->tx_up_in_progress) { |
||
1766 | process_single_up_tx_qlock(mgr); |
||
1767 | } |
||
1768 | mutex_unlock(&mgr->qlock); |
||
1769 | return 0; |
||
1770 | } |
||
1771 | |||
1772 | static int drm_dp_get_vc_payload_bw(int dp_link_bw, int dp_link_count) |
||
1773 | { |
||
1774 | switch (dp_link_bw) { |
||
1775 | case DP_LINK_BW_1_62: |
||
1776 | return 3 * dp_link_count; |
||
1777 | case DP_LINK_BW_2_7: |
||
1778 | return 5 * dp_link_count; |
||
1779 | case DP_LINK_BW_5_4: |
||
1780 | return 10 * dp_link_count; |
||
1781 | } |
||
1782 | return 0; |
||
1783 | } |
||
1784 | |||
1785 | /** |
||
1786 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager |
||
1787 | * @mgr: manager to set state for |
||
1788 | * @mst_state: true to enable MST on this connector - false to disable. |
||
1789 | * |
||
1790 | * This is called by the driver when it detects an MST capable device plugged |
||
1791 | * into a DP MST capable port, or when a DP MST capable device is unplugged. |
||
1792 | */ |
||
1793 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) |
||
1794 | { |
||
1795 | int ret = 0; |
||
1796 | struct drm_dp_mst_branch *mstb = NULL; |
||
1797 | |||
1798 | mutex_lock(&mgr->lock); |
||
1799 | if (mst_state == mgr->mst_state) |
||
1800 | goto out_unlock; |
||
1801 | |||
1802 | mgr->mst_state = mst_state; |
||
1803 | /* set the device into MST mode */ |
||
1804 | if (mst_state) { |
||
1805 | WARN_ON(mgr->mst_primary); |
||
1806 | |||
1807 | /* get dpcd info */ |
||
1808 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
||
1809 | if (ret != DP_RECEIVER_CAP_SIZE) { |
||
1810 | DRM_DEBUG_KMS("failed to read DPCD\n"); |
||
1811 | goto out_unlock; |
||
1812 | } |
||
1813 | |||
1814 | mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr->dpcd[1], mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK); |
||
1815 | mgr->total_pbn = 2560; |
||
1816 | mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); |
||
1817 | mgr->avail_slots = mgr->total_slots; |
||
1818 | |||
1819 | /* add initial branch device at LCT 1 */ |
||
1820 | mstb = drm_dp_add_mst_branch_device(1, NULL); |
||
1821 | if (mstb == NULL) { |
||
1822 | ret = -ENOMEM; |
||
1823 | goto out_unlock; |
||
1824 | } |
||
1825 | mstb->mgr = mgr; |
||
1826 | |||
1827 | /* give this the main reference */ |
||
1828 | mgr->mst_primary = mstb; |
||
1829 | kref_get(&mgr->mst_primary->kref); |
||
1830 | |||
1831 | { |
||
1832 | struct drm_dp_payload reset_pay; |
||
1833 | reset_pay.start_slot = 0; |
||
1834 | reset_pay.num_slots = 0x3f; |
||
1835 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); |
||
1836 | } |
||
1837 | |||
1838 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
1839 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
||
1840 | if (ret < 0) { |
||
1841 | goto out_unlock; |
||
1842 | } |
||
1843 | |||
1844 | |||
1845 | /* sort out guid */ |
||
1846 | ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16); |
||
1847 | if (ret != 16) { |
||
1848 | DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret); |
||
1849 | goto out_unlock; |
||
1850 | } |
||
1851 | |||
1852 | mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid); |
||
1853 | if (!mgr->guid_valid) { |
||
1854 | ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16); |
||
1855 | mgr->guid_valid = true; |
||
1856 | } |
||
1857 | |||
1858 | // queue_work(system_long_wq, &mgr->work); |
||
1859 | |||
1860 | ret = 0; |
||
1861 | } else { |
||
1862 | /* disable MST on the device */ |
||
1863 | mstb = mgr->mst_primary; |
||
1864 | mgr->mst_primary = NULL; |
||
1865 | /* this can fail if the device is gone */ |
||
1866 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); |
||
1867 | ret = 0; |
||
1868 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); |
||
1869 | mgr->payload_mask = 0; |
||
1870 | set_bit(0, &mgr->payload_mask); |
||
1871 | } |
||
1872 | |||
1873 | out_unlock: |
||
1874 | mutex_unlock(&mgr->lock); |
||
1875 | if (mstb) |
||
1876 | drm_dp_put_mst_branch_device(mstb); |
||
1877 | return ret; |
||
1878 | |||
1879 | } |
||
1880 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); |
||
1881 | |||
1882 | /** |
||
1883 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager |
||
1884 | * @mgr: manager to suspend |
||
1885 | * |
||
1886 | * This function tells the MST device that we can't handle UP messages |
||
1887 | * anymore. This should stop it from sending any since we are suspended. |
||
1888 | */ |
||
1889 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) |
||
1890 | { |
||
1891 | mutex_lock(&mgr->lock); |
||
1892 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
1893 | DP_MST_EN | DP_UPSTREAM_IS_SRC); |
||
1894 | mutex_unlock(&mgr->lock); |
||
1895 | } |
||
1896 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); |
||
1897 | |||
1898 | /** |
||
1899 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager |
||
1900 | * @mgr: manager to resume |
||
1901 | * |
||
1902 | * This will fetch DPCD and see if the device is still there, |
||
1903 | * if it is, it will rewrite the MSTM control bits, and return. |
||
1904 | * |
||
1905 | * if the device fails this returns -1, and the driver should do |
||
1906 | * a full MST reprobe, in case we were undocked. |
||
1907 | */ |
||
1908 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) |
||
1909 | { |
||
1910 | int ret = 0; |
||
1911 | |||
1912 | mutex_lock(&mgr->lock); |
||
1913 | |||
1914 | if (mgr->mst_primary) { |
||
1915 | int sret; |
||
1916 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
||
1917 | if (sret != DP_RECEIVER_CAP_SIZE) { |
||
1918 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
||
1919 | ret = -1; |
||
1920 | goto out_unlock; |
||
1921 | } |
||
1922 | |||
1923 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
||
1924 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
||
1925 | if (ret < 0) { |
||
1926 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); |
||
1927 | ret = -1; |
||
1928 | goto out_unlock; |
||
1929 | } |
||
1930 | ret = 0; |
||
1931 | } else |
||
1932 | ret = -1; |
||
1933 | |||
1934 | out_unlock: |
||
1935 | mutex_unlock(&mgr->lock); |
||
1936 | return ret; |
||
1937 | } |
||
1938 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); |
||
1939 | |||
1940 | static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) |
||
1941 | { |
||
1942 | int len; |
||
1943 | u8 replyblock[32]; |
||
1944 | int replylen, origlen, curreply; |
||
1945 | int ret; |
||
1946 | struct drm_dp_sideband_msg_rx *msg; |
||
1947 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; |
||
1948 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; |
||
1949 | |||
1950 | len = min(mgr->max_dpcd_transaction_bytes, 16); |
||
1951 | ret = drm_dp_dpcd_read(mgr->aux, basereg, |
||
1952 | replyblock, len); |
||
1953 | if (ret != len) { |
||
1954 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); |
||
1955 | return; |
||
1956 | } |
||
1957 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); |
||
1958 | if (!ret) { |
||
1959 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); |
||
1960 | return; |
||
1961 | } |
||
1962 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; |
||
1963 | |||
1964 | origlen = replylen; |
||
1965 | replylen -= len; |
||
1966 | curreply = len; |
||
1967 | while (replylen > 0) { |
||
1968 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); |
||
1969 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, |
||
1970 | replyblock, len); |
||
1971 | if (ret != len) { |
||
1972 | DRM_DEBUG_KMS("failed to read a chunk\n"); |
||
1973 | } |
||
1974 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); |
||
1975 | if (ret == false) |
||
1976 | DRM_DEBUG_KMS("failed to build sideband msg\n"); |
||
1977 | curreply += len; |
||
1978 | replylen -= len; |
||
1979 | } |
||
1980 | } |
||
1981 | |||
1982 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) |
||
1983 | { |
||
1984 | int ret = 0; |
||
1985 | |||
1986 | drm_dp_get_one_sb_msg(mgr, false); |
||
1987 | |||
1988 | if (mgr->down_rep_recv.have_eomt) { |
||
1989 | struct drm_dp_sideband_msg_tx *txmsg; |
||
1990 | struct drm_dp_mst_branch *mstb; |
||
1991 | int slot = -1; |
||
1992 | mstb = drm_dp_get_mst_branch_device(mgr, |
||
1993 | mgr->down_rep_recv.initial_hdr.lct, |
||
1994 | mgr->down_rep_recv.initial_hdr.rad); |
||
1995 | |||
1996 | if (!mstb) { |
||
1997 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); |
||
1998 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
1999 | return 0; |
||
2000 | } |
||
2001 | |||
2002 | /* find the message */ |
||
2003 | slot = mgr->down_rep_recv.initial_hdr.seqno; |
||
2004 | mutex_lock(&mgr->qlock); |
||
2005 | txmsg = mstb->tx_slots[slot]; |
||
2006 | /* remove from slots */ |
||
2007 | mutex_unlock(&mgr->qlock); |
||
2008 | |||
2009 | if (!txmsg) { |
||
2010 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", |
||
2011 | mstb, |
||
2012 | mgr->down_rep_recv.initial_hdr.seqno, |
||
2013 | mgr->down_rep_recv.initial_hdr.lct, |
||
2014 | mgr->down_rep_recv.initial_hdr.rad[0], |
||
2015 | mgr->down_rep_recv.msg[0]); |
||
2016 | drm_dp_put_mst_branch_device(mstb); |
||
2017 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2018 | return 0; |
||
2019 | } |
||
2020 | |||
2021 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); |
||
2022 | if (txmsg->reply.reply_type == 1) { |
||
2023 | 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); |
||
2024 | } |
||
2025 | |||
2026 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2027 | drm_dp_put_mst_branch_device(mstb); |
||
2028 | |||
2029 | mutex_lock(&mgr->qlock); |
||
2030 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; |
||
2031 | mstb->tx_slots[slot] = NULL; |
||
2032 | mutex_unlock(&mgr->qlock); |
||
2033 | |||
2034 | // wake_up(&mgr->tx_waitq); |
||
2035 | } |
||
2036 | return ret; |
||
2037 | } |
||
2038 | |||
2039 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
||
2040 | { |
||
2041 | int ret = 0; |
||
2042 | drm_dp_get_one_sb_msg(mgr, true); |
||
2043 | |||
2044 | if (mgr->up_req_recv.have_eomt) { |
||
2045 | struct drm_dp_sideband_msg_req_body msg; |
||
2046 | struct drm_dp_mst_branch *mstb; |
||
2047 | bool seqno; |
||
2048 | mstb = drm_dp_get_mst_branch_device(mgr, |
||
2049 | mgr->up_req_recv.initial_hdr.lct, |
||
2050 | mgr->up_req_recv.initial_hdr.rad); |
||
2051 | if (!mstb) { |
||
2052 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
||
2053 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2054 | return 0; |
||
2055 | } |
||
2056 | |||
2057 | seqno = mgr->up_req_recv.initial_hdr.seqno; |
||
2058 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); |
||
2059 | |||
2060 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { |
||
2061 | drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); |
||
2062 | drm_dp_update_port(mstb, &msg.u.conn_stat); |
||
2063 | 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); |
||
2064 | (*mgr->cbs->hotplug)(mgr); |
||
2065 | |||
2066 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
||
2067 | drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); |
||
2068 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); |
||
2069 | } |
||
2070 | |||
2071 | drm_dp_put_mst_branch_device(mstb); |
||
2072 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
||
2073 | } |
||
2074 | return ret; |
||
2075 | } |
||
2076 | |||
2077 | /** |
||
2078 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify |
||
2079 | * @mgr: manager to notify irq for. |
||
2080 | * @esi: 4 bytes from SINK_COUNT_ESI |
||
2081 | * |
||
2082 | * This should be called from the driver when it detects a short IRQ, |
||
2083 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The |
||
2084 | * topology manager will process the sideband messages received as a result |
||
2085 | * of this. |
||
2086 | */ |
||
2087 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) |
||
2088 | { |
||
2089 | int ret = 0; |
||
2090 | int sc; |
||
2091 | *handled = false; |
||
2092 | sc = esi[0] & 0x3f; |
||
2093 | |||
2094 | if (sc != mgr->sink_count) { |
||
2095 | mgr->sink_count = sc; |
||
2096 | *handled = true; |
||
2097 | } |
||
2098 | |||
2099 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { |
||
2100 | ret = drm_dp_mst_handle_down_rep(mgr); |
||
2101 | *handled = true; |
||
2102 | } |
||
2103 | |||
2104 | if (esi[1] & DP_UP_REQ_MSG_RDY) { |
||
2105 | ret |= drm_dp_mst_handle_up_req(mgr); |
||
2106 | *handled = true; |
||
2107 | } |
||
2108 | |||
2109 | drm_dp_mst_kick_tx(mgr); |
||
2110 | return ret; |
||
2111 | } |
||
2112 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); |
||
2113 | |||
2114 | /** |
||
2115 | * drm_dp_mst_detect_port() - get connection status for an MST port |
||
2116 | * @mgr: manager for this port |
||
2117 | * @port: unverified pointer to a port |
||
2118 | * |
||
2119 | * This returns the current connection state for a port. It validates the |
||
2120 | * port pointer still exists so the caller doesn't require a reference |
||
2121 | */ |
||
2122 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2123 | { |
||
2124 | enum drm_connector_status status = connector_status_disconnected; |
||
2125 | |||
2126 | /* we need to search for the port in the mgr in case its gone */ |
||
2127 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2128 | if (!port) |
||
2129 | return connector_status_disconnected; |
||
2130 | |||
2131 | if (!port->ddps) |
||
2132 | goto out; |
||
2133 | |||
2134 | switch (port->pdt) { |
||
2135 | case DP_PEER_DEVICE_NONE: |
||
2136 | case DP_PEER_DEVICE_MST_BRANCHING: |
||
2137 | break; |
||
2138 | |||
2139 | case DP_PEER_DEVICE_SST_SINK: |
||
2140 | status = connector_status_connected; |
||
2141 | break; |
||
2142 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
||
2143 | if (port->ldps) |
||
2144 | status = connector_status_connected; |
||
2145 | break; |
||
2146 | } |
||
2147 | out: |
||
2148 | drm_dp_put_port(port); |
||
2149 | return status; |
||
2150 | } |
||
2151 | EXPORT_SYMBOL(drm_dp_mst_detect_port); |
||
2152 | |||
2153 | /** |
||
2154 | * drm_dp_mst_get_edid() - get EDID for an MST port |
||
2155 | * @connector: toplevel connector to get EDID for |
||
2156 | * @mgr: manager for this port |
||
2157 | * @port: unverified pointer to a port. |
||
2158 | * |
||
2159 | * This returns an EDID for the port connected to a connector, |
||
2160 | * It validates the pointer still exists so the caller doesn't require a |
||
2161 | * reference. |
||
2162 | */ |
||
2163 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2164 | { |
||
2165 | struct edid *edid = NULL; |
||
2166 | |||
2167 | /* we need to search for the port in the mgr in case its gone */ |
||
2168 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2169 | if (!port) |
||
2170 | return NULL; |
||
2171 | |||
2172 | edid = drm_get_edid(connector, &port->aux.ddc); |
||
2173 | drm_dp_put_port(port); |
||
2174 | return edid; |
||
2175 | } |
||
2176 | EXPORT_SYMBOL(drm_dp_mst_get_edid); |
||
2177 | |||
2178 | /** |
||
2179 | * drm_dp_find_vcpi_slots() - find slots for this PBN value |
||
2180 | * @mgr: manager to use |
||
2181 | * @pbn: payload bandwidth to convert into slots. |
||
2182 | */ |
||
2183 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, |
||
2184 | int pbn) |
||
2185 | { |
||
2186 | int num_slots; |
||
2187 | |||
2188 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
||
2189 | |||
2190 | if (num_slots > mgr->avail_slots) |
||
2191 | return -ENOSPC; |
||
2192 | return num_slots; |
||
2193 | } |
||
2194 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); |
||
2195 | |||
2196 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
||
2197 | struct drm_dp_vcpi *vcpi, int pbn) |
||
2198 | { |
||
2199 | int num_slots; |
||
2200 | int ret; |
||
2201 | |||
2202 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
||
2203 | |||
2204 | if (num_slots > mgr->avail_slots) |
||
2205 | return -ENOSPC; |
||
2206 | |||
2207 | vcpi->pbn = pbn; |
||
2208 | vcpi->aligned_pbn = num_slots * mgr->pbn_div; |
||
2209 | vcpi->num_slots = num_slots; |
||
2210 | |||
2211 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); |
||
2212 | if (ret < 0) |
||
2213 | return ret; |
||
2214 | return 0; |
||
2215 | } |
||
2216 | |||
2217 | /** |
||
2218 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel |
||
2219 | * @mgr: manager for this port |
||
2220 | * @port: port to allocate a virtual channel for. |
||
2221 | * @pbn: payload bandwidth number to request |
||
2222 | * @slots: returned number of slots for this PBN. |
||
2223 | */ |
||
2224 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) |
||
2225 | { |
||
2226 | int ret; |
||
2227 | |||
2228 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2229 | if (!port) |
||
2230 | return false; |
||
2231 | |||
2232 | if (port->vcpi.vcpi > 0) { |
||
2233 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); |
||
2234 | if (pbn == port->vcpi.pbn) { |
||
2235 | *slots = port->vcpi.num_slots; |
||
2236 | return true; |
||
2237 | } |
||
2238 | } |
||
2239 | |||
2240 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); |
||
2241 | if (ret) { |
||
2242 | DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); |
||
2243 | goto out; |
||
2244 | } |
||
2245 | DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); |
||
2246 | *slots = port->vcpi.num_slots; |
||
2247 | |||
2248 | drm_dp_put_port(port); |
||
2249 | return true; |
||
2250 | out: |
||
2251 | return false; |
||
2252 | } |
||
2253 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); |
||
2254 | |||
2255 | /** |
||
2256 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI |
||
2257 | * @mgr: manager for this port |
||
2258 | * @port: unverified pointer to a port. |
||
2259 | * |
||
2260 | * This just resets the number of slots for the ports VCPI for later programming. |
||
2261 | */ |
||
2262 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2263 | { |
||
2264 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2265 | if (!port) |
||
2266 | return; |
||
2267 | port->vcpi.num_slots = 0; |
||
2268 | drm_dp_put_port(port); |
||
2269 | } |
||
2270 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); |
||
2271 | |||
2272 | /** |
||
2273 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI |
||
2274 | * @mgr: manager for this port |
||
2275 | * @port: unverified port to deallocate vcpi for |
||
2276 | */ |
||
2277 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
||
2278 | { |
||
2279 | port = drm_dp_get_validated_port_ref(mgr, port); |
||
2280 | if (!port) |
||
2281 | return; |
||
2282 | |||
2283 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); |
||
2284 | port->vcpi.num_slots = 0; |
||
2285 | port->vcpi.pbn = 0; |
||
2286 | port->vcpi.aligned_pbn = 0; |
||
2287 | port->vcpi.vcpi = 0; |
||
2288 | drm_dp_put_port(port); |
||
2289 | } |
||
2290 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); |
||
2291 | |||
2292 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
||
2293 | int id, struct drm_dp_payload *payload) |
||
2294 | { |
||
2295 | u8 payload_alloc[3], status; |
||
2296 | int ret; |
||
2297 | int retries = 0; |
||
2298 | |||
2299 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, |
||
2300 | DP_PAYLOAD_TABLE_UPDATED); |
||
2301 | |||
2302 | payload_alloc[0] = id; |
||
2303 | payload_alloc[1] = payload->start_slot; |
||
2304 | payload_alloc[2] = payload->num_slots; |
||
2305 | |||
2306 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); |
||
2307 | if (ret != 3) { |
||
2308 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); |
||
2309 | goto fail; |
||
2310 | } |
||
2311 | |||
2312 | retry: |
||
2313 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
||
2314 | if (ret < 0) { |
||
2315 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
||
2316 | goto fail; |
||
2317 | } |
||
2318 | |||
2319 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { |
||
2320 | retries++; |
||
2321 | if (retries < 20) { |
||
2322 | usleep_range(10000, 20000); |
||
2323 | goto retry; |
||
2324 | } |
||
2325 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); |
||
2326 | ret = -EINVAL; |
||
2327 | goto fail; |
||
2328 | } |
||
2329 | ret = 0; |
||
2330 | fail: |
||
2331 | return ret; |
||
2332 | } |
||
2333 | |||
2334 | |||
2335 | /** |
||
2336 | * drm_dp_check_act_status() - Check ACT handled status. |
||
2337 | * @mgr: manager to use |
||
2338 | * |
||
2339 | * Check the payload status bits in the DPCD for ACT handled completion. |
||
2340 | */ |
||
2341 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) |
||
2342 | { |
||
2343 | u8 status; |
||
2344 | int ret; |
||
2345 | int count = 0; |
||
2346 | |||
2347 | do { |
||
2348 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
||
2349 | |||
2350 | if (ret < 0) { |
||
2351 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
||
2352 | goto fail; |
||
2353 | } |
||
2354 | |||
2355 | if (status & DP_PAYLOAD_ACT_HANDLED) |
||
2356 | break; |
||
2357 | count++; |
||
2358 | udelay(100); |
||
2359 | |||
2360 | } while (count < 30); |
||
2361 | |||
2362 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { |
||
2363 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); |
||
2364 | ret = -EINVAL; |
||
2365 | goto fail; |
||
2366 | } |
||
2367 | return 0; |
||
2368 | fail: |
||
2369 | return ret; |
||
2370 | } |
||
2371 | EXPORT_SYMBOL(drm_dp_check_act_status); |
||
2372 | |||
2373 | /** |
||
2374 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. |
||
2375 | * @clock: dot clock for the mode |
||
2376 | * @bpp: bpp for the mode. |
||
2377 | * |
||
2378 | * This uses the formula in the spec to calculate the PBN value for a mode. |
||
2379 | */ |
||
2380 | int drm_dp_calc_pbn_mode(int clock, int bpp) |
||
2381 | { |
||
2382 | fixed20_12 pix_bw; |
||
2383 | fixed20_12 fbpp; |
||
2384 | fixed20_12 result; |
||
2385 | fixed20_12 margin, tmp; |
||
2386 | u32 res; |
||
2387 | |||
2388 | pix_bw.full = dfixed_const(clock); |
||
2389 | fbpp.full = dfixed_const(bpp); |
||
2390 | tmp.full = dfixed_const(8); |
||
2391 | fbpp.full = dfixed_div(fbpp, tmp); |
||
2392 | |||
2393 | result.full = dfixed_mul(pix_bw, fbpp); |
||
2394 | margin.full = dfixed_const(54); |
||
2395 | tmp.full = dfixed_const(64); |
||
2396 | margin.full = dfixed_div(margin, tmp); |
||
2397 | result.full = dfixed_div(result, margin); |
||
2398 | |||
2399 | margin.full = dfixed_const(1006); |
||
2400 | tmp.full = dfixed_const(1000); |
||
2401 | margin.full = dfixed_div(margin, tmp); |
||
2402 | result.full = dfixed_mul(result, margin); |
||
2403 | |||
2404 | result.full = dfixed_div(result, tmp); |
||
2405 | result.full = dfixed_ceil(result); |
||
2406 | res = dfixed_trunc(result); |
||
2407 | return res; |
||
2408 | } |
||
2409 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); |
||
2410 | |||
2411 | static int test_calc_pbn_mode(void) |
||
2412 | { |
||
2413 | int ret; |
||
2414 | ret = drm_dp_calc_pbn_mode(154000, 30); |
||
2415 | if (ret != 689) |
||
2416 | return -EINVAL; |
||
2417 | ret = drm_dp_calc_pbn_mode(234000, 30); |
||
2418 | if (ret != 1047) |
||
2419 | return -EINVAL; |
||
2420 | return 0; |
||
2421 | } |
||
2422 | |||
2423 | /* we want to kick the TX after we've ack the up/down IRQs. */ |
||
2424 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) |
||
2425 | { |
||
2426 | // queue_work(system_long_wq, &mgr->tx_work); |
||
2427 | } |
||
2428 | |||
2429 | static void drm_dp_mst_dump_mstb(struct seq_file *m, |
||
2430 | struct drm_dp_mst_branch *mstb) |
||
2431 | { |
||
2432 | struct drm_dp_mst_port *port; |
||
2433 | int tabs = mstb->lct; |
||
2434 | char prefix[10]; |
||
2435 | int i; |
||
2436 | |||
2437 | for (i = 0; i < tabs; i++) |
||
2438 | prefix[i] = '\t'; |
||
2439 | prefix[i] = '\0'; |
||
2440 | |||
2441 | // seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); |
||
2442 | // list_for_each_entry(port, &mstb->ports, next) { |
||
2443 | // seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); |
||
2444 | // if (port->mstb) |
||
2445 | // drm_dp_mst_dump_mstb(m, port->mstb); |
||
2446 | // } |
||
2447 | } |
||
2448 | |||
2449 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
||
2450 | char *buf) |
||
2451 | { |
||
2452 | int ret; |
||
2453 | int i; |
||
2454 | for (i = 0; i < 4; i++) { |
||
2455 | ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); |
||
2456 | if (ret != 16) |
||
2457 | break; |
||
2458 | } |
||
2459 | if (i == 4) |
||
2460 | return true; |
||
2461 | return false; |
||
2462 | } |
||
2463 | |||
2464 | /** |
||
2465 | * drm_dp_mst_dump_topology(): dump topology to seq file. |
||
2466 | * @m: seq_file to dump output to |
||
2467 | * @mgr: manager to dump current topology for. |
||
2468 | * |
||
2469 | * helper to dump MST topology to a seq file for debugfs. |
||
2470 | */ |
||
2471 | void drm_dp_mst_dump_topology(struct seq_file *m, |
||
2472 | struct drm_dp_mst_topology_mgr *mgr) |
||
2473 | { |
||
2474 | int i; |
||
2475 | struct drm_dp_mst_port *port; |
||
2476 | mutex_lock(&mgr->lock); |
||
2477 | if (mgr->mst_primary) |
||
2478 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); |
||
2479 | |||
2480 | /* dump VCPIs */ |
||
2481 | mutex_unlock(&mgr->lock); |
||
2482 | |||
2483 | |||
2484 | |||
2485 | } |
||
2486 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); |
||
2487 | |||
2488 | static void drm_dp_tx_work(struct work_struct *work) |
||
2489 | { |
||
2490 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); |
||
2491 | |||
2492 | mutex_lock(&mgr->qlock); |
||
2493 | if (mgr->tx_down_in_progress) |
||
2494 | process_single_down_tx_qlock(mgr); |
||
2495 | mutex_unlock(&mgr->qlock); |
||
2496 | } |
||
2497 | |||
2498 | /** |
||
2499 | * drm_dp_mst_topology_mgr_init - initialise a topology manager |
||
2500 | * @mgr: manager struct to initialise |
||
2501 | * @dev: device providing this structure - for i2c addition. |
||
2502 | * @aux: DP helper aux channel to talk to this device |
||
2503 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit |
||
2504 | * @max_payloads: maximum number of payloads this GPU can source |
||
2505 | * @conn_base_id: the connector object ID the MST device is connected to. |
||
2506 | * |
||
2507 | * Return 0 for success, or negative error code on failure |
||
2508 | */ |
||
2509 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, |
||
2510 | struct device *dev, struct drm_dp_aux *aux, |
||
2511 | int max_dpcd_transaction_bytes, |
||
2512 | int max_payloads, int conn_base_id) |
||
2513 | { |
||
2514 | mutex_init(&mgr->lock); |
||
2515 | mutex_init(&mgr->qlock); |
||
2516 | mutex_init(&mgr->payload_lock); |
||
2517 | INIT_LIST_HEAD(&mgr->tx_msg_upq); |
||
2518 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
||
2519 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
||
2520 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); |
||
2521 | // init_waitqueue_head(&mgr->tx_waitq); |
||
2522 | mgr->dev = dev; |
||
2523 | mgr->aux = aux; |
||
2524 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; |
||
2525 | mgr->max_payloads = max_payloads; |
||
2526 | mgr->conn_base_id = conn_base_id; |
||
2527 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
||
2528 | if (!mgr->payloads) |
||
2529 | return -ENOMEM; |
||
2530 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); |
||
2531 | if (!mgr->proposed_vcpis) |
||
2532 | return -ENOMEM; |
||
2533 | set_bit(0, &mgr->payload_mask); |
||
2534 | test_calc_pbn_mode(); |
||
2535 | return 0; |
||
2536 | } |
||
2537 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); |
||
2538 | |||
2539 | /** |
||
2540 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. |
||
2541 | * @mgr: manager to destroy |
||
2542 | */ |
||
2543 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) |
||
2544 | { |
||
2545 | mutex_lock(&mgr->payload_lock); |
||
2546 | kfree(mgr->payloads); |
||
2547 | mgr->payloads = NULL; |
||
2548 | kfree(mgr->proposed_vcpis); |
||
2549 | mgr->proposed_vcpis = NULL; |
||
2550 | mutex_unlock(&mgr->payload_lock); |
||
2551 | mgr->dev = NULL; |
||
2552 | mgr->aux = NULL; |
||
2553 | } |
||
2554 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); |
||
2555 | |||
2556 | /* I2C device */ |
||
2557 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, |
||
2558 | int num) |
||
2559 | { |
||
2560 | struct drm_dp_aux *aux = adapter->algo_data; |
||
2561 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); |
||
2562 | struct drm_dp_mst_branch *mstb; |
||
2563 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
||
2564 | unsigned int i; |
||
2565 | bool reading = false; |
||
2566 | struct drm_dp_sideband_msg_req_body msg; |
||
2567 | struct drm_dp_sideband_msg_tx *txmsg = NULL; |
||
2568 | int ret; |
||
2569 | |||
2570 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
||
2571 | if (!mstb) |
||
2572 | return -EREMOTEIO; |
||
2573 | |||
2574 | /* construct i2c msg */ |
||
2575 | /* see if last msg is a read */ |
||
2576 | if (msgs[num - 1].flags & I2C_M_RD) |
||
2577 | reading = true; |
||
2578 | |||
2579 | if (!reading) { |
||
2580 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
||
2581 | ret = -EIO; |
||
2582 | goto out; |
||
2583 | } |
||
2584 | |||
2585 | msg.req_type = DP_REMOTE_I2C_READ; |
||
2586 | msg.u.i2c_read.num_transactions = num - 1; |
||
2587 | msg.u.i2c_read.port_number = port->port_num; |
||
2588 | for (i = 0; i < num - 1; i++) { |
||
2589 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; |
||
2590 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; |
||
2591 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; |
||
2592 | } |
||
2593 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; |
||
2594 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; |
||
2595 | |||
2596 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
||
2597 | if (!txmsg) { |
||
2598 | ret = -ENOMEM; |
||
2599 | goto out; |
||
2600 | } |
||
2601 | |||
2602 | txmsg->dst = mstb; |
||
2603 | drm_dp_encode_sideband_req(&msg, txmsg); |
||
2604 | |||
2605 | drm_dp_queue_down_tx(mgr, txmsg); |
||
2606 | |||
2607 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
||
2608 | if (ret > 0) { |
||
2609 | |||
2610 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ |
||
2611 | ret = -EREMOTEIO; |
||
2612 | goto out; |
||
2613 | } |
||
2614 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { |
||
2615 | ret = -EIO; |
||
2616 | goto out; |
||
2617 | } |
||
2618 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); |
||
2619 | ret = num; |
||
2620 | } |
||
2621 | out: |
||
2622 | kfree(txmsg); |
||
2623 | drm_dp_put_mst_branch_device(mstb); |
||
2624 | return ret; |
||
2625 | } |
||
2626 | |||
2627 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) |
||
2628 | { |
||
2629 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | |
||
2630 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | |
||
2631 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | |
||
2632 | I2C_FUNC_10BIT_ADDR; |
||
2633 | } |
||
2634 | |||
2635 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { |
||
2636 | .functionality = drm_dp_mst_i2c_functionality, |
||
2637 | .master_xfer = drm_dp_mst_i2c_xfer, |
||
2638 | }; |
||
2639 | |||
2640 | /** |
||
2641 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX |
||
2642 | * @aux: DisplayPort AUX channel |
||
2643 | * |
||
2644 | * Returns 0 on success or a negative error code on failure. |
||
2645 | */ |
||
2646 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) |
||
2647 | { |
||
2648 | aux->ddc.algo = &drm_dp_mst_i2c_algo; |
||
2649 | aux->ddc.algo_data = aux; |
||
2650 | aux->ddc.retries = 3; |
||
2651 | |||
2652 | aux->ddc.class = I2C_CLASS_DDC; |
||
2653 | aux->ddc.owner = THIS_MODULE; |
||
2654 | aux->ddc.dev.parent = aux->dev; |
||
2655 | |||
2656 | return i2c_add_adapter(&aux->ddc); |
||
2657 | } |
||
2658 | |||
2659 | /** |
||
2660 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter |
||
2661 | * @aux: DisplayPort AUX channel |
||
2662 | */ |
||
2663 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) |
||
2664 | { |
||
2665 | i2c_del_adapter(&aux->ddc); |
||
2666 | }>>>>>>>>>>>>>>>>>>>>><>><>><>><>><>><>>><>><>><>>><>><>><>><>><>><>>><>><>>><>><>><>><>><>>><>=><=>=><=>=><=>=><=> |