1 /* 2 * Copyright 2023 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: AMD 23 * 24 */ 25 26 /* FILE POLICY AND INTENDED USAGE: 27 * This file owns timing validation against various link limitations. (ex. 28 * link bandwidth, receiver capability or our hardware capability) It also 29 * provides helper functions exposing bandwidth formulas used in validation. 30 */ 31 #include "link_validation.h" 32 #include "protocols/link_dp_capability.h" 33 #include "protocols/link_dp_dpia_bw.h" 34 #include "resource.h" 35 36 #define DC_LOGGER_INIT(logger) 37 38 static uint32_t get_tmds_output_pixel_clock_100hz(const struct dc_crtc_timing *timing) 39 { 40 41 uint32_t pxl_clk = timing->pix_clk_100hz; 42 43 if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) 44 pxl_clk /= 2; 45 else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) 46 pxl_clk = pxl_clk * 2 / 3; 47 48 if (timing->display_color_depth == COLOR_DEPTH_101010) 49 pxl_clk = pxl_clk * 10 / 8; 50 else if (timing->display_color_depth == COLOR_DEPTH_121212) 51 pxl_clk = pxl_clk * 12 / 8; 52 53 return pxl_clk; 54 } 55 56 static bool dp_active_dongle_validate_timing( 57 const struct dc_crtc_timing *timing, 58 const struct dpcd_caps *dpcd_caps) 59 { 60 const struct dc_dongle_caps *dongle_caps = &dpcd_caps->dongle_caps; 61 62 switch (dpcd_caps->dongle_type) { 63 case DISPLAY_DONGLE_DP_VGA_CONVERTER: 64 case DISPLAY_DONGLE_DP_DVI_CONVERTER: 65 case DISPLAY_DONGLE_DP_DVI_DONGLE: 66 if (timing->pixel_encoding == PIXEL_ENCODING_RGB) 67 return true; 68 else 69 return false; 70 default: 71 break; 72 } 73 74 if (dpcd_caps->dongle_type == DISPLAY_DONGLE_DP_HDMI_CONVERTER && 75 dongle_caps->extendedCapValid == true) { 76 /* Check Pixel Encoding */ 77 switch (timing->pixel_encoding) { 78 case PIXEL_ENCODING_RGB: 79 case PIXEL_ENCODING_YCBCR444: 80 break; 81 case PIXEL_ENCODING_YCBCR422: 82 if (!dongle_caps->is_dp_hdmi_ycbcr422_pass_through) 83 return false; 84 break; 85 case PIXEL_ENCODING_YCBCR420: 86 if (!dongle_caps->is_dp_hdmi_ycbcr420_pass_through) 87 return false; 88 break; 89 default: 90 /* Invalid Pixel Encoding*/ 91 return false; 92 } 93 94 switch (timing->display_color_depth) { 95 case COLOR_DEPTH_666: 96 case COLOR_DEPTH_888: 97 /*888 and 666 should always be supported*/ 98 break; 99 case COLOR_DEPTH_101010: 100 if (dongle_caps->dp_hdmi_max_bpc < 10) 101 return false; 102 break; 103 case COLOR_DEPTH_121212: 104 if (dongle_caps->dp_hdmi_max_bpc < 12) 105 return false; 106 break; 107 case COLOR_DEPTH_141414: 108 case COLOR_DEPTH_161616: 109 default: 110 /* These color depths are currently not supported */ 111 return false; 112 } 113 114 /* Check 3D format */ 115 switch (timing->timing_3d_format) { 116 case TIMING_3D_FORMAT_NONE: 117 case TIMING_3D_FORMAT_FRAME_ALTERNATE: 118 /*Only frame alternate 3D is supported on active dongle*/ 119 break; 120 default: 121 /*other 3D formats are not supported due to bad infoframe translation */ 122 return false; 123 } 124 125 if (dongle_caps->dp_hdmi_frl_max_link_bw_in_kbps > 0) { // DP to HDMI FRL converter 126 struct dc_crtc_timing outputTiming = *timing; 127 128 if (timing->flags.DSC && !timing->dsc_cfg.is_frl) 129 /* DP input has DSC, HDMI FRL output doesn't have DSC, remove DSC from output timing */ 130 outputTiming.flags.DSC = 0; 131 if (dc_bandwidth_in_kbps_from_timing(&outputTiming, DC_LINK_ENCODING_HDMI_FRL) > 132 dongle_caps->dp_hdmi_frl_max_link_bw_in_kbps) 133 return false; 134 } else { // DP to HDMI TMDS converter 135 if (get_tmds_output_pixel_clock_100hz(timing) > (dongle_caps->dp_hdmi_max_pixel_clk_in_khz * 10)) 136 return false; 137 } 138 } 139 140 if (dpcd_caps->channel_coding_cap.bits.DP_128b_132b_SUPPORTED == 0 && 141 dpcd_caps->dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_PASSTHROUGH_SUPPORT == 0 && 142 dongle_caps->dfp_cap_ext.supported) { 143 144 if (dongle_caps->dfp_cap_ext.max_pixel_rate_in_mps < (timing->pix_clk_100hz / 10000)) 145 return false; 146 147 if (dongle_caps->dfp_cap_ext.max_video_h_active_width < timing->h_addressable) 148 return false; 149 150 if (dongle_caps->dfp_cap_ext.max_video_v_active_height < timing->v_addressable) 151 return false; 152 153 if (timing->pixel_encoding == PIXEL_ENCODING_RGB) { 154 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 155 return false; 156 if (timing->display_color_depth == COLOR_DEPTH_666 && 157 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_6bpc) 158 return false; 159 else if (timing->display_color_depth == COLOR_DEPTH_888 && 160 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_8bpc) 161 return false; 162 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 163 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_10bpc) 164 return false; 165 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 166 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_12bpc) 167 return false; 168 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 169 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_16bpc) 170 return false; 171 } else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR444) { 172 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 173 return false; 174 if (timing->display_color_depth == COLOR_DEPTH_888 && 175 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_8bpc) 176 return false; 177 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 178 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_10bpc) 179 return false; 180 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 181 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_12bpc) 182 return false; 183 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 184 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_16bpc) 185 return false; 186 } else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) { 187 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 188 return false; 189 if (timing->display_color_depth == COLOR_DEPTH_888 && 190 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_8bpc) 191 return false; 192 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 193 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_10bpc) 194 return false; 195 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 196 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_12bpc) 197 return false; 198 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 199 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_16bpc) 200 return false; 201 } else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) { 202 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 203 return false; 204 if (timing->display_color_depth == COLOR_DEPTH_888 && 205 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_8bpc) 206 return false; 207 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 208 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_10bpc) 209 return false; 210 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 211 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_12bpc) 212 return false; 213 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 214 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_16bpc) 215 return false; 216 } 217 } 218 219 return true; 220 } 221 222 uint32_t dp_link_bandwidth_kbps( 223 const struct dc_link *link, 224 const struct dc_link_settings *link_settings) 225 { 226 uint32_t total_data_bw_efficiency_x10000 = 0; 227 uint32_t link_rate_per_lane_kbps = 0; 228 229 switch (link_dp_get_encoding_format(link_settings)) { 230 case DP_8b_10b_ENCODING: 231 /* For 8b/10b encoding: 232 * link rate is defined in the unit of LINK_RATE_REF_FREQ_IN_KHZ per DP byte per lane. 233 * data bandwidth efficiency is 80% with additional 3% overhead if FEC is supported. 234 */ 235 link_rate_per_lane_kbps = link_settings->link_rate * LINK_RATE_REF_FREQ_IN_KHZ * BITS_PER_DP_BYTE; 236 total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_8b_10b_x10000; 237 if (dp_should_enable_fec(link)) { 238 total_data_bw_efficiency_x10000 /= 100; 239 total_data_bw_efficiency_x10000 *= DATA_EFFICIENCY_8b_10b_FEC_EFFICIENCY_x100; 240 } 241 break; 242 case DP_128b_132b_ENCODING: 243 /* For 128b/132b encoding: 244 * link rate is defined in the unit of 10mbps per lane. 245 * total data bandwidth efficiency is always 96.71%. 246 */ 247 link_rate_per_lane_kbps = link_settings->link_rate * 10000; 248 total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_128b_132b_x10000; 249 break; 250 default: 251 break; 252 } 253 254 /* overall effective link bandwidth = link rate per lane * lane count * total data bandwidth efficiency */ 255 return link_rate_per_lane_kbps * link_settings->lane_count / 10000 * total_data_bw_efficiency_x10000; 256 } 257 258 static bool dp_validate_mode_timing( 259 struct dc_link *link, 260 const struct dc_crtc_timing *timing) 261 { 262 uint32_t req_bw; 263 uint32_t max_bw; 264 265 const struct dc_link_settings *link_setting; 266 267 /* According to spec, VSC SDP should be used if pixel format is YCbCr420 */ 268 if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420 && 269 !link->dpcd_caps.dprx_feature.bits.VSC_SDP_COLORIMETRY_SUPPORTED && 270 dal_graphics_object_id_get_connector_id(link->link_id) != CONNECTOR_ID_VIRTUAL) 271 return false; 272 273 /*always DP fail safe mode*/ 274 if ((timing->pix_clk_100hz / 10) == (uint32_t) 25175 && 275 timing->h_addressable == (uint32_t) 640 && 276 timing->v_addressable == (uint32_t) 480) 277 return true; 278 279 link_setting = dp_get_verified_link_cap(link); 280 281 /* TODO: DYNAMIC_VALIDATION needs to be implemented */ 282 /*if (flags.DYNAMIC_VALIDATION == 1 && 283 link->verified_link_cap.lane_count != LANE_COUNT_UNKNOWN) 284 link_setting = &link->verified_link_cap; 285 */ 286 287 req_bw = dc_bandwidth_in_kbps_from_timing(timing, dc_link_get_highest_encoding_format(link)); 288 max_bw = dp_link_bandwidth_kbps(link, link_setting); 289 290 bool is_max_uncompressed_pixel_rate_exceeded = link->dpcd_caps.max_uncompressed_pixel_rate_cap.bits.valid && 291 timing->pix_clk_100hz > link->dpcd_caps.max_uncompressed_pixel_rate_cap.bits.max_uncompressed_pixel_rate_cap * 10000; 292 293 if (is_max_uncompressed_pixel_rate_exceeded && !timing->flags.DSC) { 294 return false; 295 } 296 297 if (req_bw <= max_bw) { 298 /* remember the biggest mode here, during 299 * initial link training (to get 300 * verified_link_cap), LS sends event about 301 * cannot train at reported cap to upper 302 * layer and upper layer will re-enumerate modes. 303 * this is not necessary if the lower 304 * verified_link_cap is enough to drive 305 * all the modes */ 306 307 /* TODO: DYNAMIC_VALIDATION needs to be implemented */ 308 /* if (flags.DYNAMIC_VALIDATION == 1) 309 dpsst->max_req_bw_for_verified_linkcap = dal_max( 310 dpsst->max_req_bw_for_verified_linkcap, req_bw); */ 311 return true; 312 } else 313 return false; 314 } 315 316 enum dc_status link_validate_mode_timing( 317 const struct dc_stream_state *stream, 318 struct dc_link *link, 319 const struct dc_crtc_timing *timing) 320 { 321 uint32_t max_pix_clk = stream->link->dongle_max_pix_clk * 10; 322 struct dpcd_caps *dpcd_caps = &link->dpcd_caps; 323 324 /* A hack to avoid failing any modes for EDID override feature on 325 * topology change such as lower quality cable for DP or different dongle 326 */ 327 if (link->remote_sinks[0] && link->remote_sinks[0]->sink_signal == SIGNAL_TYPE_VIRTUAL) 328 return DC_OK; 329 330 /* Passive Dongle */ 331 if (max_pix_clk != 0 && get_tmds_output_pixel_clock_100hz(timing) > max_pix_clk) 332 return DC_EXCEED_DONGLE_CAP; 333 334 /* Active Dongle*/ 335 if (!dp_active_dongle_validate_timing(timing, dpcd_caps)) 336 return DC_EXCEED_DONGLE_CAP; 337 338 switch (stream->signal) { 339 case SIGNAL_TYPE_EDP: 340 case SIGNAL_TYPE_DISPLAY_PORT: 341 if (!dp_validate_mode_timing( 342 link, 343 timing)) 344 return DC_NO_DP_LINK_BANDWIDTH; 345 break; 346 347 default: 348 break; 349 } 350 351 return DC_OK; 352 } 353 354 /* 355 * This function calculates the bandwidth required for the stream timing 356 * and aggregates the stream bandwidth for the respective dpia link 357 * 358 * @stream: pointer to the dc_stream_state struct instance 359 * @num_streams: number of streams to be validated 360 * 361 * return: true if validation is succeeded 362 */ 363 bool link_validate_dpia_bandwidth(const struct dc_stream_state *stream, const unsigned int num_streams) 364 { 365 int bw_needed[MAX_DPIA_NUM] = {0}; 366 struct dc_link *dpia_link[MAX_DPIA_NUM] = {0}; 367 int num_dpias = 0; 368 369 for (unsigned int i = 0; i < num_streams; ++i) { 370 if (stream[i].signal == SIGNAL_TYPE_DISPLAY_PORT) { 371 /* new dpia sst stream, check whether it exceeds max dpia */ 372 if (num_dpias >= MAX_DPIA_NUM) 373 return false; 374 375 dpia_link[num_dpias] = stream[i].link; 376 bw_needed[num_dpias] = dc_bandwidth_in_kbps_from_timing(&stream[i].timing, 377 dc_link_get_highest_encoding_format(dpia_link[num_dpias])); 378 num_dpias++; 379 } else if (stream[i].signal == SIGNAL_TYPE_DISPLAY_PORT_MST) { 380 uint8_t j = 0; 381 /* check whether its a known dpia link */ 382 for (; j < num_dpias; ++j) { 383 if (dpia_link[j] == stream[i].link) 384 break; 385 } 386 387 if (j == num_dpias) { 388 /* new dpia mst stream, check whether it exceeds max dpia */ 389 if (num_dpias >= MAX_DPIA_NUM) 390 return false; 391 else { 392 dpia_link[j] = stream[i].link; 393 num_dpias++; 394 } 395 } 396 397 bw_needed[j] += dc_bandwidth_in_kbps_from_timing(&stream[i].timing, 398 dc_link_get_highest_encoding_format(dpia_link[j])); 399 } 400 } 401 402 /* Include dp overheads */ 403 for (uint8_t i = 0; i < num_dpias; ++i) { 404 int dp_overhead = 0; 405 406 dp_overhead = link_dp_dpia_get_dp_overhead_in_dp_tunneling(dpia_link[i]); 407 bw_needed[i] += dp_overhead; 408 } 409 410 return dpia_validate_usb4_bw(dpia_link, bw_needed, num_dpias); 411 } 412