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 38static 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 56static 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 defined(CONFIG_DRM_AMD_DC_FP) 129 if (timing->flags.DSC && !timing->dsc_cfg.is_frl) 130 /* DP input has DSC, HDMI FRL output doesn't have DSC, remove DSC from output timing */ 131 outputTiming.flags.DSC = 0; 132#endif 133 if (dc_bandwidth_in_kbps_from_timing(&outputTiming, DC_LINK_ENCODING_HDMI_FRL) > 134 dongle_caps->dp_hdmi_frl_max_link_bw_in_kbps) 135 return false; 136 } else { // DP to HDMI TMDS converter 137 if (get_tmds_output_pixel_clock_100hz(timing) > (dongle_caps->dp_hdmi_max_pixel_clk_in_khz * 10)) 138 return false; 139 } 140 } 141 142 if (dpcd_caps->channel_coding_cap.bits.DP_128b_132b_SUPPORTED == 0 && 143 dpcd_caps->dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_PASSTHROUGH_SUPPORT == 0 && 144 dongle_caps->dfp_cap_ext.supported) { 145 146 if (dongle_caps->dfp_cap_ext.max_pixel_rate_in_mps < (timing->pix_clk_100hz / 10000)) 147 return false; 148 149 if (dongle_caps->dfp_cap_ext.max_video_h_active_width < timing->h_addressable) 150 return false; 151 152 if (dongle_caps->dfp_cap_ext.max_video_v_active_height < timing->v_addressable) 153 return false; 154 155 if (timing->pixel_encoding == PIXEL_ENCODING_RGB) { 156 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 157 return false; 158 if (timing->display_color_depth == COLOR_DEPTH_666 && 159 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_6bpc) 160 return false; 161 else if (timing->display_color_depth == COLOR_DEPTH_888 && 162 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_8bpc) 163 return false; 164 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 165 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_10bpc) 166 return false; 167 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 168 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_12bpc) 169 return false; 170 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 171 !dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_16bpc) 172 return false; 173 } else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR444) { 174 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 175 return false; 176 if (timing->display_color_depth == COLOR_DEPTH_888 && 177 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_8bpc) 178 return false; 179 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 180 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_10bpc) 181 return false; 182 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 183 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_12bpc) 184 return false; 185 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 186 !dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_16bpc) 187 return false; 188 } else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) { 189 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 190 return false; 191 if (timing->display_color_depth == COLOR_DEPTH_888 && 192 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_8bpc) 193 return false; 194 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 195 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_10bpc) 196 return false; 197 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 198 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_12bpc) 199 return false; 200 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 201 !dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_16bpc) 202 return false; 203 } else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) { 204 if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb) 205 return false; 206 if (timing->display_color_depth == COLOR_DEPTH_888 && 207 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_8bpc) 208 return false; 209 else if (timing->display_color_depth == COLOR_DEPTH_101010 && 210 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_10bpc) 211 return false; 212 else if (timing->display_color_depth == COLOR_DEPTH_121212 && 213 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_12bpc) 214 return false; 215 else if (timing->display_color_depth == COLOR_DEPTH_161616 && 216 !dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_16bpc) 217 return false; 218 } 219 } 220 221 return true; 222} 223 224uint32_t dp_link_bandwidth_kbps( 225 const struct dc_link *link, 226 const struct dc_link_settings *link_settings) 227{ 228 uint32_t total_data_bw_efficiency_x10000 = 0; 229 uint32_t link_rate_per_lane_kbps = 0; 230 231 switch (link_dp_get_encoding_format(link_settings)) { 232 case DP_8b_10b_ENCODING: 233 /* For 8b/10b encoding: 234 * link rate is defined in the unit of LINK_RATE_REF_FREQ_IN_KHZ per DP byte per lane. 235 * data bandwidth efficiency is 80% with additional 3% overhead if FEC is supported. 236 */ 237 link_rate_per_lane_kbps = link_settings->link_rate * LINK_RATE_REF_FREQ_IN_KHZ * BITS_PER_DP_BYTE; 238 total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_8b_10b_x10000; 239 if (dp_should_enable_fec(link)) { 240 total_data_bw_efficiency_x10000 /= 100; 241 total_data_bw_efficiency_x10000 *= DATA_EFFICIENCY_8b_10b_FEC_EFFICIENCY_x100; 242 } 243 break; 244 case DP_128b_132b_ENCODING: 245 /* For 128b/132b encoding: 246 * link rate is defined in the unit of 10mbps per lane. 247 * total data bandwidth efficiency is always 96.71%. 248 */ 249 link_rate_per_lane_kbps = link_settings->link_rate * 10000; 250 total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_128b_132b_x10000; 251 break; 252 default: 253 break; 254 } 255 256 /* overall effective link bandwidth = link rate per lane * lane count * total data bandwidth efficiency */ 257 return link_rate_per_lane_kbps * link_settings->lane_count / 10000 * total_data_bw_efficiency_x10000; 258} 259 260static bool dp_validate_mode_timing( 261 struct dc_link *link, 262 const struct dc_crtc_timing *timing) 263{ 264 uint32_t req_bw; 265 uint32_t max_bw; 266 267 const struct dc_link_settings *link_setting; 268 269 /* According to spec, VSC SDP should be used if pixel format is YCbCr420 */ 270 if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420 && 271 !link->dpcd_caps.dprx_feature.bits.VSC_SDP_COLORIMETRY_SUPPORTED && 272 dal_graphics_object_id_get_connector_id(link->link_id) != CONNECTOR_ID_VIRTUAL) 273 return false; 274 275 /*always DP fail safe mode*/ 276 if ((timing->pix_clk_100hz / 10) == (uint32_t) 25175 && 277 timing->h_addressable == (uint32_t) 640 && 278 timing->v_addressable == (uint32_t) 480) 279 return true; 280 281 link_setting = dp_get_verified_link_cap(link); 282 283 /* TODO: DYNAMIC_VALIDATION needs to be implemented */ 284 /*if (flags.DYNAMIC_VALIDATION == 1 && 285 link->verified_link_cap.lane_count != LANE_COUNT_UNKNOWN) 286 link_setting = &link->verified_link_cap; 287 */ 288 289 req_bw = dc_bandwidth_in_kbps_from_timing(timing, dc_link_get_highest_encoding_format(link)); 290 max_bw = dp_link_bandwidth_kbps(link, link_setting); 291 292 if (req_bw <= max_bw) { 293 /* remember the biggest mode here, during 294 * initial link training (to get 295 * verified_link_cap), LS sends event about 296 * cannot train at reported cap to upper 297 * layer and upper layer will re-enumerate modes. 298 * this is not necessary if the lower 299 * verified_link_cap is enough to drive 300 * all the modes */ 301 302 /* TODO: DYNAMIC_VALIDATION needs to be implemented */ 303 /* if (flags.DYNAMIC_VALIDATION == 1) 304 dpsst->max_req_bw_for_verified_linkcap = dal_max( 305 dpsst->max_req_bw_for_verified_linkcap, req_bw); */ 306 return true; 307 } else 308 return false; 309} 310 311enum dc_status link_validate_mode_timing( 312 const struct dc_stream_state *stream, 313 struct dc_link *link, 314 const struct dc_crtc_timing *timing) 315{ 316 uint32_t max_pix_clk = stream->link->dongle_max_pix_clk * 10; 317 struct dpcd_caps *dpcd_caps = &link->dpcd_caps; 318 319 /* A hack to avoid failing any modes for EDID override feature on 320 * topology change such as lower quality cable for DP or different dongle 321 */ 322 if (link->remote_sinks[0] && link->remote_sinks[0]->sink_signal == SIGNAL_TYPE_VIRTUAL) 323 return DC_OK; 324 325 /* Passive Dongle */ 326 if (max_pix_clk != 0 && get_tmds_output_pixel_clock_100hz(timing) > max_pix_clk) 327 return DC_EXCEED_DONGLE_CAP; 328 329 /* Active Dongle*/ 330 if (!dp_active_dongle_validate_timing(timing, dpcd_caps)) 331 return DC_EXCEED_DONGLE_CAP; 332 333 switch (stream->signal) { 334 case SIGNAL_TYPE_EDP: 335 case SIGNAL_TYPE_DISPLAY_PORT: 336 if (!dp_validate_mode_timing( 337 link, 338 timing)) 339 return DC_NO_DP_LINK_BANDWIDTH; 340 break; 341 342 default: 343 break; 344 } 345 346 return DC_OK; 347} 348 349/* 350 * This function calculates the bandwidth required for the stream timing 351 * and aggregates the stream bandwidth for the respective dpia link 352 * 353 * @stream: pointer to the dc_stream_state struct instance 354 * @num_streams: number of streams to be validated 355 * 356 * return: true if validation is succeeded 357 */ 358bool link_validate_dpia_bandwidth(const struct dc_stream_state *stream, const unsigned int num_streams) 359{ 360 int bw_needed[MAX_DPIA_NUM] = {0}; 361 struct dc_link *dpia_link[MAX_DPIA_NUM] = {0}; 362 int num_dpias = 0; 363 364 for (unsigned int i = 0; i < num_streams; ++i) { 365 if (stream[i].signal == SIGNAL_TYPE_DISPLAY_PORT) { 366 /* new dpia sst stream, check whether it exceeds max dpia */ 367 if (num_dpias >= MAX_DPIA_NUM) 368 return false; 369 370 dpia_link[num_dpias] = stream[i].link; 371 bw_needed[num_dpias] = dc_bandwidth_in_kbps_from_timing(&stream[i].timing, 372 dc_link_get_highest_encoding_format(dpia_link[num_dpias])); 373 num_dpias++; 374 } else if (stream[i].signal == SIGNAL_TYPE_DISPLAY_PORT_MST) { 375 uint8_t j = 0; 376 /* check whether its a known dpia link */ 377 for (; j < num_dpias; ++j) { 378 if (dpia_link[j] == stream[i].link) 379 break; 380 } 381 382 if (j == num_dpias) { 383 /* new dpia mst stream, check whether it exceeds max dpia */ 384 if (num_dpias >= MAX_DPIA_NUM) 385 return false; 386 else { 387 dpia_link[j] = stream[i].link; 388 num_dpias++; 389 } 390 } 391 392 bw_needed[j] += dc_bandwidth_in_kbps_from_timing(&stream[i].timing, 393 dc_link_get_highest_encoding_format(dpia_link[j])); 394 } 395 } 396 397 /* Include dp overheads */ 398 for (uint8_t i = 0; i < num_dpias; ++i) { 399 int dp_overhead = 0; 400 401 dp_overhead = link_dp_dpia_get_dp_overhead_in_dp_tunneling(dpia_link[i]); 402 bw_needed[i] += dp_overhead; 403 } 404 405 return dpia_validate_usb4_bw(dpia_link, bw_needed, num_dpias); 406} 407