1 /* 2 * Copyright 2019 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 * Author: AMD 23 */ 24 25 #include <drm/display/drm_dp_helper.h> 26 #include <drm/display/drm_dsc_helper.h> 27 #include "dc_hw_types.h" 28 #include "dsc.h" 29 #include "dc.h" 30 #include "rc_calc.h" 31 #include "fixed31_32.h" 32 33 /* This module's internal functions */ 34 35 /* default DSC policy target bitrate limit is 16bpp */ 36 static uint32_t dsc_policy_max_target_bpp_limit = 16; 37 38 /* default DSC policy enables DSC only when needed */ 39 static bool dsc_policy_enable_dsc_when_not_needed; 40 41 static bool dsc_policy_disable_dsc_stream_overhead; 42 43 #ifndef MAX 44 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y)) 45 #endif 46 #ifndef MIN 47 #define MIN(X, Y) ((X) < (Y) ? (X) : (Y)) 48 #endif 49 50 uint32_t dc_bandwidth_in_kbps_from_timing( 51 const struct dc_crtc_timing *timing) 52 { 53 uint32_t bits_per_channel = 0; 54 uint32_t kbps; 55 56 if (timing->flags.DSC) 57 return dc_dsc_stream_bandwidth_in_kbps(timing, 58 timing->dsc_cfg.bits_per_pixel, 59 timing->dsc_cfg.num_slices_h, 60 timing->dsc_cfg.is_dp); 61 62 switch (timing->display_color_depth) { 63 case COLOR_DEPTH_666: 64 bits_per_channel = 6; 65 break; 66 case COLOR_DEPTH_888: 67 bits_per_channel = 8; 68 break; 69 case COLOR_DEPTH_101010: 70 bits_per_channel = 10; 71 break; 72 case COLOR_DEPTH_121212: 73 bits_per_channel = 12; 74 break; 75 case COLOR_DEPTH_141414: 76 bits_per_channel = 14; 77 break; 78 case COLOR_DEPTH_161616: 79 bits_per_channel = 16; 80 break; 81 default: 82 ASSERT(bits_per_channel != 0); 83 bits_per_channel = 8; 84 break; 85 } 86 87 kbps = timing->pix_clk_100hz / 10; 88 kbps *= bits_per_channel; 89 90 if (timing->flags.Y_ONLY != 1) { 91 /*Only YOnly make reduce bandwidth by 1/3 compares to RGB*/ 92 kbps *= 3; 93 if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) 94 kbps /= 2; 95 else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) 96 kbps = kbps * 2 / 3; 97 } 98 99 return kbps; 100 } 101 102 103 /* Forward Declerations */ 104 static bool decide_dsc_bandwidth_range( 105 const uint32_t min_bpp_x16, 106 const uint32_t max_bpp_x16, 107 const uint32_t num_slices_h, 108 const struct dsc_enc_caps *dsc_caps, 109 const struct dc_crtc_timing *timing, 110 struct dc_dsc_bw_range *range); 111 112 static uint32_t compute_bpp_x16_from_target_bandwidth( 113 const uint32_t bandwidth_in_kbps, 114 const struct dc_crtc_timing *timing, 115 const uint32_t num_slices_h, 116 const uint32_t bpp_increment_div, 117 const bool is_dp); 118 119 static void get_dsc_enc_caps( 120 const struct display_stream_compressor *dsc, 121 struct dsc_enc_caps *dsc_enc_caps, 122 int pixel_clock_100Hz); 123 124 static bool intersect_dsc_caps( 125 const struct dsc_dec_dpcd_caps *dsc_sink_caps, 126 const struct dsc_enc_caps *dsc_enc_caps, 127 enum dc_pixel_encoding pixel_encoding, 128 struct dsc_enc_caps *dsc_common_caps); 129 130 static bool setup_dsc_config( 131 const struct dsc_dec_dpcd_caps *dsc_sink_caps, 132 const struct dsc_enc_caps *dsc_enc_caps, 133 int target_bandwidth_kbps, 134 const struct dc_crtc_timing *timing, 135 const struct dc_dsc_config_options *options, 136 struct dc_dsc_config *dsc_cfg); 137 138 static bool dsc_buff_block_size_from_dpcd(int dpcd_buff_block_size, int *buff_block_size) 139 { 140 141 switch (dpcd_buff_block_size) { 142 case DP_DSC_RC_BUF_BLK_SIZE_1: 143 *buff_block_size = 1024; 144 break; 145 case DP_DSC_RC_BUF_BLK_SIZE_4: 146 *buff_block_size = 4 * 1024; 147 break; 148 case DP_DSC_RC_BUF_BLK_SIZE_16: 149 *buff_block_size = 16 * 1024; 150 break; 151 case DP_DSC_RC_BUF_BLK_SIZE_64: 152 *buff_block_size = 64 * 1024; 153 break; 154 default: { 155 dm_error("%s: DPCD DSC buffer size not recognized.\n", __func__); 156 return false; 157 } 158 } 159 160 return true; 161 } 162 163 164 static bool dsc_line_buff_depth_from_dpcd(int dpcd_line_buff_bit_depth, int *line_buff_bit_depth) 165 { 166 if (0 <= dpcd_line_buff_bit_depth && dpcd_line_buff_bit_depth <= 7) 167 *line_buff_bit_depth = dpcd_line_buff_bit_depth + 9; 168 else if (dpcd_line_buff_bit_depth == 8) 169 *line_buff_bit_depth = 8; 170 else { 171 dm_error("%s: DPCD DSC buffer depth not recognized.\n", __func__); 172 return false; 173 } 174 175 return true; 176 } 177 178 179 static bool dsc_throughput_from_dpcd(int dpcd_throughput, int *throughput) 180 { 181 switch (dpcd_throughput) { 182 case DP_DSC_THROUGHPUT_MODE_0_UNSUPPORTED: 183 *throughput = 0; 184 break; 185 case DP_DSC_THROUGHPUT_MODE_0_170: 186 *throughput = 170; 187 break; 188 case DP_DSC_THROUGHPUT_MODE_0_340: 189 *throughput = 340; 190 break; 191 case DP_DSC_THROUGHPUT_MODE_0_400: 192 *throughput = 400; 193 break; 194 case DP_DSC_THROUGHPUT_MODE_0_450: 195 *throughput = 450; 196 break; 197 case DP_DSC_THROUGHPUT_MODE_0_500: 198 *throughput = 500; 199 break; 200 case DP_DSC_THROUGHPUT_MODE_0_550: 201 *throughput = 550; 202 break; 203 case DP_DSC_THROUGHPUT_MODE_0_600: 204 *throughput = 600; 205 break; 206 case DP_DSC_THROUGHPUT_MODE_0_650: 207 *throughput = 650; 208 break; 209 case DP_DSC_THROUGHPUT_MODE_0_700: 210 *throughput = 700; 211 break; 212 case DP_DSC_THROUGHPUT_MODE_0_750: 213 *throughput = 750; 214 break; 215 case DP_DSC_THROUGHPUT_MODE_0_800: 216 *throughput = 800; 217 break; 218 case DP_DSC_THROUGHPUT_MODE_0_850: 219 *throughput = 850; 220 break; 221 case DP_DSC_THROUGHPUT_MODE_0_900: 222 *throughput = 900; 223 break; 224 case DP_DSC_THROUGHPUT_MODE_0_950: 225 *throughput = 950; 226 break; 227 case DP_DSC_THROUGHPUT_MODE_0_1000: 228 *throughput = 1000; 229 break; 230 default: { 231 dm_error("%s: DPCD DSC throughput mode not recognized.\n", __func__); 232 return false; 233 } 234 } 235 236 return true; 237 } 238 239 240 static bool dsc_bpp_increment_div_from_dpcd(uint8_t bpp_increment_dpcd, uint32_t *bpp_increment_div) 241 { 242 // Mask bpp increment dpcd field to avoid reading other fields 243 bpp_increment_dpcd &= 0x7; 244 245 switch (bpp_increment_dpcd) { 246 case 0: 247 *bpp_increment_div = 16; 248 break; 249 case 1: 250 *bpp_increment_div = 8; 251 break; 252 case 2: 253 *bpp_increment_div = 4; 254 break; 255 case 3: 256 *bpp_increment_div = 2; 257 break; 258 case 4: 259 *bpp_increment_div = 1; 260 break; 261 default: { 262 dm_error("%s: DPCD DSC bits-per-pixel increment not recognized.\n", __func__); 263 return false; 264 } 265 } 266 267 return true; 268 } 269 270 271 272 bool dc_dsc_parse_dsc_dpcd(const struct dc *dc, 273 const uint8_t *dpcd_dsc_basic_data, 274 const uint8_t *dpcd_dsc_branch_decoder_caps, 275 struct dsc_dec_dpcd_caps *dsc_sink_caps) 276 { 277 if (!dpcd_dsc_basic_data) 278 return false; 279 280 dsc_sink_caps->is_dsc_supported = 281 (dpcd_dsc_basic_data[DP_DSC_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED) != 0; 282 if (!dsc_sink_caps->is_dsc_supported) 283 return false; 284 285 dsc_sink_caps->dsc_version = dpcd_dsc_basic_data[DP_DSC_REV - DP_DSC_SUPPORT]; 286 287 { 288 int buff_block_size; 289 int buff_size; 290 291 if (!dsc_buff_block_size_from_dpcd(dpcd_dsc_basic_data[DP_DSC_RC_BUF_BLK_SIZE - DP_DSC_SUPPORT], 292 &buff_block_size)) 293 return false; 294 295 buff_size = dpcd_dsc_basic_data[DP_DSC_RC_BUF_SIZE - DP_DSC_SUPPORT] + 1; 296 dsc_sink_caps->rc_buffer_size = buff_size * buff_block_size; 297 } 298 299 dsc_sink_caps->slice_caps1.raw = dpcd_dsc_basic_data[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT]; 300 if (!dsc_line_buff_depth_from_dpcd(dpcd_dsc_basic_data[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT], 301 &dsc_sink_caps->lb_bit_depth)) 302 return false; 303 304 dsc_sink_caps->is_block_pred_supported = 305 (dpcd_dsc_basic_data[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] & 306 DP_DSC_BLK_PREDICTION_IS_SUPPORTED) != 0; 307 308 dsc_sink_caps->edp_max_bits_per_pixel = 309 dpcd_dsc_basic_data[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] | 310 dpcd_dsc_basic_data[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] << 8; 311 312 dsc_sink_caps->color_formats.raw = dpcd_dsc_basic_data[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT]; 313 dsc_sink_caps->color_depth.raw = dpcd_dsc_basic_data[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT]; 314 315 { 316 int dpcd_throughput = dpcd_dsc_basic_data[DP_DSC_PEAK_THROUGHPUT - DP_DSC_SUPPORT]; 317 318 if (!dsc_throughput_from_dpcd(dpcd_throughput & DP_DSC_THROUGHPUT_MODE_0_MASK, 319 &dsc_sink_caps->throughput_mode_0_mps)) 320 return false; 321 322 dpcd_throughput = (dpcd_throughput & DP_DSC_THROUGHPUT_MODE_1_MASK) >> DP_DSC_THROUGHPUT_MODE_1_SHIFT; 323 if (!dsc_throughput_from_dpcd(dpcd_throughput, &dsc_sink_caps->throughput_mode_1_mps)) 324 return false; 325 } 326 327 dsc_sink_caps->max_slice_width = dpcd_dsc_basic_data[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] * 320; 328 dsc_sink_caps->slice_caps2.raw = dpcd_dsc_basic_data[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT]; 329 330 if (!dsc_bpp_increment_div_from_dpcd(dpcd_dsc_basic_data[DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT], 331 &dsc_sink_caps->bpp_increment_div)) 332 return false; 333 334 if (dc->debug.dsc_bpp_increment_div) { 335 /* dsc_bpp_increment_div should onl be 1, 2, 4, 8 or 16, but rather than rejecting invalid values, 336 * we'll accept all and get it into range. This also makes the above check against 0 redundant, 337 * but that one stresses out the override will be only used if it's not 0. 338 */ 339 if (dc->debug.dsc_bpp_increment_div >= 1) 340 dsc_sink_caps->bpp_increment_div = 1; 341 if (dc->debug.dsc_bpp_increment_div >= 2) 342 dsc_sink_caps->bpp_increment_div = 2; 343 if (dc->debug.dsc_bpp_increment_div >= 4) 344 dsc_sink_caps->bpp_increment_div = 4; 345 if (dc->debug.dsc_bpp_increment_div >= 8) 346 dsc_sink_caps->bpp_increment_div = 8; 347 if (dc->debug.dsc_bpp_increment_div >= 16) 348 dsc_sink_caps->bpp_increment_div = 16; 349 } 350 351 /* Extended caps */ 352 if (dpcd_dsc_branch_decoder_caps == NULL) { // branch decoder DPCD DSC data can be null for non branch device 353 dsc_sink_caps->branch_overall_throughput_0_mps = 0; 354 dsc_sink_caps->branch_overall_throughput_1_mps = 0; 355 dsc_sink_caps->branch_max_line_width = 0; 356 return true; 357 } 358 359 dsc_sink_caps->branch_overall_throughput_0_mps = 360 dpcd_dsc_branch_decoder_caps[DP_DSC_BRANCH_OVERALL_THROUGHPUT_0 - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0]; 361 if (dsc_sink_caps->branch_overall_throughput_0_mps == 0) 362 dsc_sink_caps->branch_overall_throughput_0_mps = 0; 363 else if (dsc_sink_caps->branch_overall_throughput_0_mps == 1) 364 dsc_sink_caps->branch_overall_throughput_0_mps = 680; 365 else { 366 dsc_sink_caps->branch_overall_throughput_0_mps *= 50; 367 dsc_sink_caps->branch_overall_throughput_0_mps += 600; 368 } 369 370 dsc_sink_caps->branch_overall_throughput_1_mps = 371 dpcd_dsc_branch_decoder_caps[DP_DSC_BRANCH_OVERALL_THROUGHPUT_1 - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0]; 372 if (dsc_sink_caps->branch_overall_throughput_1_mps == 0) 373 dsc_sink_caps->branch_overall_throughput_1_mps = 0; 374 else if (dsc_sink_caps->branch_overall_throughput_1_mps == 1) 375 dsc_sink_caps->branch_overall_throughput_1_mps = 680; 376 else { 377 dsc_sink_caps->branch_overall_throughput_1_mps *= 50; 378 dsc_sink_caps->branch_overall_throughput_1_mps += 600; 379 } 380 381 dsc_sink_caps->branch_max_line_width = 382 dpcd_dsc_branch_decoder_caps[DP_DSC_BRANCH_MAX_LINE_WIDTH - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0] * 320; 383 ASSERT(dsc_sink_caps->branch_max_line_width == 0 || dsc_sink_caps->branch_max_line_width >= 5120); 384 385 dsc_sink_caps->is_dp = true; 386 return true; 387 } 388 389 390 /* If DSC is possbile, get DSC bandwidth range based on [min_bpp, max_bpp] target bitrate range and 391 * timing's pixel clock and uncompressed bandwidth. 392 * If DSC is not possible, leave '*range' untouched. 393 */ 394 bool dc_dsc_compute_bandwidth_range( 395 const struct display_stream_compressor *dsc, 396 uint32_t dsc_min_slice_height_override, 397 uint32_t min_bpp_x16, 398 uint32_t max_bpp_x16, 399 const struct dsc_dec_dpcd_caps *dsc_sink_caps, 400 const struct dc_crtc_timing *timing, 401 struct dc_dsc_bw_range *range) 402 { 403 bool is_dsc_possible = false; 404 struct dsc_enc_caps dsc_enc_caps; 405 struct dsc_enc_caps dsc_common_caps; 406 struct dc_dsc_config config; 407 struct dc_dsc_config_options options = {0}; 408 409 options.dsc_min_slice_height_override = dsc_min_slice_height_override; 410 options.max_target_bpp_limit_override_x16 = max_bpp_x16; 411 options.slice_height_granularity = 1; 412 413 get_dsc_enc_caps(dsc, &dsc_enc_caps, timing->pix_clk_100hz); 414 415 is_dsc_possible = intersect_dsc_caps(dsc_sink_caps, &dsc_enc_caps, 416 timing->pixel_encoding, &dsc_common_caps); 417 418 if (is_dsc_possible) 419 is_dsc_possible = setup_dsc_config(dsc_sink_caps, &dsc_enc_caps, 0, timing, 420 &options, &config); 421 422 if (is_dsc_possible) 423 is_dsc_possible = decide_dsc_bandwidth_range(min_bpp_x16, max_bpp_x16, 424 config.num_slices_h, &dsc_common_caps, timing, range); 425 426 return is_dsc_possible; 427 } 428 429 static void get_dsc_enc_caps( 430 const struct display_stream_compressor *dsc, 431 struct dsc_enc_caps *dsc_enc_caps, 432 int pixel_clock_100Hz) 433 { 434 // This is a static HW query, so we can use any DSC 435 436 memset(dsc_enc_caps, 0, sizeof(struct dsc_enc_caps)); 437 if (dsc) { 438 if (!dsc->ctx->dc->debug.disable_dsc) 439 dsc->funcs->dsc_get_enc_caps(dsc_enc_caps, pixel_clock_100Hz); 440 if (dsc->ctx->dc->debug.native422_support) 441 dsc_enc_caps->color_formats.bits.YCBCR_NATIVE_422 = 1; 442 } 443 } 444 445 /* Returns 'false' if no intersection was found for at least one capability. 446 * It also implicitly validates some sink caps against invalid value of zero. 447 */ 448 static bool intersect_dsc_caps( 449 const struct dsc_dec_dpcd_caps *dsc_sink_caps, 450 const struct dsc_enc_caps *dsc_enc_caps, 451 enum dc_pixel_encoding pixel_encoding, 452 struct dsc_enc_caps *dsc_common_caps) 453 { 454 int32_t max_slices; 455 int32_t total_sink_throughput; 456 457 memset(dsc_common_caps, 0, sizeof(struct dsc_enc_caps)); 458 459 dsc_common_caps->dsc_version = min(dsc_sink_caps->dsc_version, dsc_enc_caps->dsc_version); 460 if (!dsc_common_caps->dsc_version) 461 return false; 462 463 dsc_common_caps->slice_caps.bits.NUM_SLICES_1 = 464 dsc_sink_caps->slice_caps1.bits.NUM_SLICES_1 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_1; 465 dsc_common_caps->slice_caps.bits.NUM_SLICES_2 = 466 dsc_sink_caps->slice_caps1.bits.NUM_SLICES_2 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_2; 467 dsc_common_caps->slice_caps.bits.NUM_SLICES_4 = 468 dsc_sink_caps->slice_caps1.bits.NUM_SLICES_4 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_4; 469 dsc_common_caps->slice_caps.bits.NUM_SLICES_8 = 470 dsc_sink_caps->slice_caps1.bits.NUM_SLICES_8 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_8; 471 if (!dsc_common_caps->slice_caps.raw) 472 return false; 473 474 dsc_common_caps->lb_bit_depth = min(dsc_sink_caps->lb_bit_depth, dsc_enc_caps->lb_bit_depth); 475 if (!dsc_common_caps->lb_bit_depth) 476 return false; 477 478 dsc_common_caps->is_block_pred_supported = 479 dsc_sink_caps->is_block_pred_supported && dsc_enc_caps->is_block_pred_supported; 480 481 dsc_common_caps->color_formats.raw = dsc_sink_caps->color_formats.raw & dsc_enc_caps->color_formats.raw; 482 if (!dsc_common_caps->color_formats.raw) 483 return false; 484 485 dsc_common_caps->color_depth.raw = dsc_sink_caps->color_depth.raw & dsc_enc_caps->color_depth.raw; 486 if (!dsc_common_caps->color_depth.raw) 487 return false; 488 489 max_slices = 0; 490 if (dsc_common_caps->slice_caps.bits.NUM_SLICES_1) 491 max_slices = 1; 492 493 if (dsc_common_caps->slice_caps.bits.NUM_SLICES_2) 494 max_slices = 2; 495 496 if (dsc_common_caps->slice_caps.bits.NUM_SLICES_4) 497 max_slices = 4; 498 499 total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_0_mps; 500 if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420) 501 total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_1_mps; 502 503 dsc_common_caps->max_total_throughput_mps = min(total_sink_throughput, dsc_enc_caps->max_total_throughput_mps); 504 505 dsc_common_caps->max_slice_width = min(dsc_sink_caps->max_slice_width, dsc_enc_caps->max_slice_width); 506 if (!dsc_common_caps->max_slice_width) 507 return false; 508 509 dsc_common_caps->bpp_increment_div = min(dsc_sink_caps->bpp_increment_div, dsc_enc_caps->bpp_increment_div); 510 511 // TODO DSC: Remove this workaround for N422 and 420 once it's fixed, or move it to get_dsc_encoder_caps() 512 if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420) 513 dsc_common_caps->bpp_increment_div = min(dsc_common_caps->bpp_increment_div, (uint32_t)8); 514 515 dsc_common_caps->edp_sink_max_bits_per_pixel = dsc_sink_caps->edp_max_bits_per_pixel; 516 dsc_common_caps->is_dp = dsc_sink_caps->is_dp; 517 return true; 518 } 519 520 static inline uint32_t dsc_div_by_10_round_up(uint32_t value) 521 { 522 return (value + 9) / 10; 523 } 524 525 static uint32_t compute_bpp_x16_from_target_bandwidth( 526 const uint32_t bandwidth_in_kbps, 527 const struct dc_crtc_timing *timing, 528 const uint32_t num_slices_h, 529 const uint32_t bpp_increment_div, 530 const bool is_dp) 531 { 532 uint32_t overhead_in_kbps; 533 struct fixed31_32 effective_bandwidth_in_kbps; 534 struct fixed31_32 bpp_x16; 535 536 overhead_in_kbps = dc_dsc_stream_bandwidth_overhead_in_kbps( 537 timing, num_slices_h, is_dp); 538 effective_bandwidth_in_kbps = dc_fixpt_from_int(bandwidth_in_kbps); 539 effective_bandwidth_in_kbps = dc_fixpt_sub_int(effective_bandwidth_in_kbps, 540 overhead_in_kbps); 541 bpp_x16 = dc_fixpt_mul_int(effective_bandwidth_in_kbps, 10); 542 bpp_x16 = dc_fixpt_div_int(bpp_x16, timing->pix_clk_100hz); 543 bpp_x16 = dc_fixpt_from_int(dc_fixpt_floor(dc_fixpt_mul_int(bpp_x16, bpp_increment_div))); 544 bpp_x16 = dc_fixpt_div_int(bpp_x16, bpp_increment_div); 545 bpp_x16 = dc_fixpt_mul_int(bpp_x16, 16); 546 return dc_fixpt_floor(bpp_x16); 547 } 548 549 /* Decide DSC bandwidth range based on signal, timing, specs specific and input min and max 550 * requirements. 551 * The range output includes decided min/max target bpp, the respective bandwidth requirements 552 * and native timing bandwidth requirement when DSC is not used. 553 */ 554 static bool decide_dsc_bandwidth_range( 555 const uint32_t min_bpp_x16, 556 const uint32_t max_bpp_x16, 557 const uint32_t num_slices_h, 558 const struct dsc_enc_caps *dsc_caps, 559 const struct dc_crtc_timing *timing, 560 struct dc_dsc_bw_range *range) 561 { 562 uint32_t preferred_bpp_x16 = timing->dsc_fixed_bits_per_pixel_x16; 563 564 memset(range, 0, sizeof(*range)); 565 566 /* apply signal, timing, specs and explicitly specified DSC range requirements */ 567 if (preferred_bpp_x16) { 568 if (preferred_bpp_x16 <= max_bpp_x16 && 569 preferred_bpp_x16 >= min_bpp_x16) { 570 range->max_target_bpp_x16 = preferred_bpp_x16; 571 range->min_target_bpp_x16 = preferred_bpp_x16; 572 } 573 } 574 /* TODO - make this value generic to all signal types */ 575 else if (dsc_caps->edp_sink_max_bits_per_pixel) { 576 /* apply max bpp limitation from edp sink */ 577 range->max_target_bpp_x16 = MIN(dsc_caps->edp_sink_max_bits_per_pixel, 578 max_bpp_x16); 579 range->min_target_bpp_x16 = min_bpp_x16; 580 } 581 else { 582 range->max_target_bpp_x16 = max_bpp_x16; 583 range->min_target_bpp_x16 = min_bpp_x16; 584 } 585 586 /* populate output structure */ 587 if (range->max_target_bpp_x16 >= range->min_target_bpp_x16 && range->min_target_bpp_x16 > 0) { 588 /* native stream bandwidth */ 589 range->stream_kbps = dc_bandwidth_in_kbps_from_timing(timing); 590 591 /* max dsc target bpp */ 592 range->max_kbps = dc_dsc_stream_bandwidth_in_kbps(timing, 593 range->max_target_bpp_x16, num_slices_h, dsc_caps->is_dp); 594 595 /* min dsc target bpp */ 596 range->min_kbps = dc_dsc_stream_bandwidth_in_kbps(timing, 597 range->min_target_bpp_x16, num_slices_h, dsc_caps->is_dp); 598 } 599 600 return range->max_kbps >= range->min_kbps && range->min_kbps > 0; 601 } 602 603 /* Decides if DSC should be used and calculates target bpp if it should, applying DSC policy. 604 * 605 * Returns: 606 * - 'true' if target bpp is decided 607 * - 'false' if target bpp cannot be decided (e.g. cannot fit even with min DSC bpp), 608 */ 609 static bool decide_dsc_target_bpp_x16( 610 const struct dc_dsc_policy *policy, 611 const struct dsc_enc_caps *dsc_common_caps, 612 const int target_bandwidth_kbps, 613 const struct dc_crtc_timing *timing, 614 const int num_slices_h, 615 int *target_bpp_x16) 616 { 617 struct dc_dsc_bw_range range; 618 619 *target_bpp_x16 = 0; 620 621 if (decide_dsc_bandwidth_range(policy->min_target_bpp * 16, policy->max_target_bpp * 16, 622 num_slices_h, dsc_common_caps, timing, &range)) { 623 if (target_bandwidth_kbps >= range.stream_kbps) { 624 if (policy->enable_dsc_when_not_needed) 625 /* enable max bpp even dsc is not needed */ 626 *target_bpp_x16 = range.max_target_bpp_x16; 627 } else if (target_bandwidth_kbps >= range.max_kbps) { 628 /* use max target bpp allowed */ 629 *target_bpp_x16 = range.max_target_bpp_x16; 630 } else if (target_bandwidth_kbps >= range.min_kbps) { 631 /* use target bpp that can take entire target bandwidth */ 632 *target_bpp_x16 = compute_bpp_x16_from_target_bandwidth( 633 target_bandwidth_kbps, timing, num_slices_h, 634 dsc_common_caps->bpp_increment_div, 635 dsc_common_caps->is_dp); 636 } 637 } 638 639 return *target_bpp_x16 != 0; 640 } 641 642 #define MIN_AVAILABLE_SLICES_SIZE 6 643 644 static int get_available_dsc_slices(union dsc_enc_slice_caps slice_caps, int *available_slices) 645 { 646 int idx = 0; 647 648 memset(available_slices, -1, MIN_AVAILABLE_SLICES_SIZE); 649 650 if (slice_caps.bits.NUM_SLICES_1) 651 available_slices[idx++] = 1; 652 653 if (slice_caps.bits.NUM_SLICES_2) 654 available_slices[idx++] = 2; 655 656 if (slice_caps.bits.NUM_SLICES_4) 657 available_slices[idx++] = 4; 658 659 if (slice_caps.bits.NUM_SLICES_8) 660 available_slices[idx++] = 8; 661 662 return idx; 663 } 664 665 666 static int get_max_dsc_slices(union dsc_enc_slice_caps slice_caps) 667 { 668 int max_slices = 0; 669 int available_slices[MIN_AVAILABLE_SLICES_SIZE]; 670 int end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); 671 672 if (end_idx > 0) 673 max_slices = available_slices[end_idx - 1]; 674 675 return max_slices; 676 } 677 678 679 // Increment slice number in available slice numbers stops if possible, or just increment if not 680 static int inc_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices) 681 { 682 // Get next bigger num slices available in common caps 683 int available_slices[MIN_AVAILABLE_SLICES_SIZE]; 684 int end_idx; 685 int i; 686 int new_num_slices = num_slices; 687 688 end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); 689 if (end_idx == 0) { 690 // No available slices found 691 new_num_slices++; 692 return new_num_slices; 693 } 694 695 // Numbers of slices found - get the next bigger number 696 for (i = 0; i < end_idx; i++) { 697 if (new_num_slices < available_slices[i]) { 698 new_num_slices = available_slices[i]; 699 break; 700 } 701 } 702 703 if (new_num_slices == num_slices) // No biger number of slices found 704 new_num_slices++; 705 706 return new_num_slices; 707 } 708 709 710 // Decrement slice number in available slice numbers stops if possible, or just decrement if not. Stop at zero. 711 static int dec_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices) 712 { 713 // Get next bigger num slices available in common caps 714 int available_slices[MIN_AVAILABLE_SLICES_SIZE]; 715 int end_idx; 716 int i; 717 int new_num_slices = num_slices; 718 719 end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); 720 if (end_idx == 0 && new_num_slices > 0) { 721 // No numbers of slices found 722 new_num_slices++; 723 return new_num_slices; 724 } 725 726 // Numbers of slices found - get the next smaller number 727 for (i = end_idx - 1; i >= 0; i--) { 728 if (new_num_slices > available_slices[i]) { 729 new_num_slices = available_slices[i]; 730 break; 731 } 732 } 733 734 if (new_num_slices == num_slices) { 735 // No smaller number of slices found 736 new_num_slices--; 737 if (new_num_slices < 0) 738 new_num_slices = 0; 739 } 740 741 return new_num_slices; 742 } 743 744 745 // Choose next bigger number of slices if the requested number of slices is not available 746 static int fit_num_slices_up(union dsc_enc_slice_caps slice_caps, int num_slices) 747 { 748 // Get next bigger num slices available in common caps 749 int available_slices[MIN_AVAILABLE_SLICES_SIZE]; 750 int end_idx; 751 int i; 752 int new_num_slices = num_slices; 753 754 end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); 755 if (end_idx == 0) { 756 // No available slices found 757 new_num_slices++; 758 return new_num_slices; 759 } 760 761 // Numbers of slices found - get the equal or next bigger number 762 for (i = 0; i < end_idx; i++) { 763 if (new_num_slices <= available_slices[i]) { 764 new_num_slices = available_slices[i]; 765 break; 766 } 767 } 768 769 return new_num_slices; 770 } 771 772 773 /* Attempts to set DSC configuration for the stream, applying DSC policy. 774 * Returns 'true' if successful or 'false' if not. 775 * 776 * Parameters: 777 * 778 * dsc_sink_caps - DSC sink decoder capabilities (from DPCD) 779 * 780 * dsc_enc_caps - DSC encoder capabilities 781 * 782 * target_bandwidth_kbps - Target bandwidth to fit the stream into. 783 * If 0, do not calculate target bpp. 784 * 785 * timing - The stream timing to fit into 'target_bandwidth_kbps' or apply 786 * maximum compression to, if 'target_badwidth == 0' 787 * 788 * dsc_cfg - DSC configuration to use if it was possible to come up with 789 * one for the given inputs. 790 * The target bitrate after DSC can be calculated by multiplying 791 * dsc_cfg.bits_per_pixel (in U6.4 format) by pixel rate, e.g. 792 * 793 * dsc_stream_bitrate_kbps = (int)ceil(timing->pix_clk_khz * dsc_cfg.bits_per_pixel / 16.0); 794 */ 795 static bool setup_dsc_config( 796 const struct dsc_dec_dpcd_caps *dsc_sink_caps, 797 const struct dsc_enc_caps *dsc_enc_caps, 798 int target_bandwidth_kbps, 799 const struct dc_crtc_timing *timing, 800 const struct dc_dsc_config_options *options, 801 struct dc_dsc_config *dsc_cfg) 802 { 803 struct dsc_enc_caps dsc_common_caps; 804 int max_slices_h; 805 int min_slices_h; 806 int num_slices_h; 807 int pic_width; 808 int slice_width; 809 int target_bpp; 810 int sink_per_slice_throughput_mps; 811 int branch_max_throughput_mps = 0; 812 bool is_dsc_possible = false; 813 int pic_height; 814 int slice_height; 815 struct dc_dsc_policy policy; 816 817 memset(dsc_cfg, 0, sizeof(struct dc_dsc_config)); 818 819 dc_dsc_get_policy_for_timing(timing, options->max_target_bpp_limit_override_x16, &policy); 820 pic_width = timing->h_addressable + timing->h_border_left + timing->h_border_right; 821 pic_height = timing->v_addressable + timing->v_border_top + timing->v_border_bottom; 822 823 if (!dsc_sink_caps->is_dsc_supported) 824 goto done; 825 826 if (dsc_sink_caps->branch_max_line_width && dsc_sink_caps->branch_max_line_width < pic_width) 827 goto done; 828 829 // Intersect decoder with encoder DSC caps and validate DSC settings 830 is_dsc_possible = intersect_dsc_caps(dsc_sink_caps, dsc_enc_caps, timing->pixel_encoding, &dsc_common_caps); 831 if (!is_dsc_possible) 832 goto done; 833 834 sink_per_slice_throughput_mps = 0; 835 836 // Validate available DSC settings against the mode timing 837 838 // Validate color format (and pick up the throughput values) 839 dsc_cfg->ycbcr422_simple = false; 840 switch (timing->pixel_encoding) { 841 case PIXEL_ENCODING_RGB: 842 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.RGB; 843 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps; 844 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_0_mps; 845 break; 846 case PIXEL_ENCODING_YCBCR444: 847 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_444; 848 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps; 849 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_0_mps; 850 break; 851 case PIXEL_ENCODING_YCBCR422: 852 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_422; 853 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_1_mps; 854 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_1_mps; 855 if (!is_dsc_possible) { 856 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_SIMPLE_422; 857 dsc_cfg->ycbcr422_simple = is_dsc_possible; 858 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps; 859 } 860 break; 861 case PIXEL_ENCODING_YCBCR420: 862 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_420; 863 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_1_mps; 864 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_1_mps; 865 break; 866 default: 867 is_dsc_possible = false; 868 } 869 870 // Validate branch's maximum throughput 871 if (branch_max_throughput_mps && dsc_div_by_10_round_up(timing->pix_clk_100hz) > branch_max_throughput_mps * 1000) 872 is_dsc_possible = false; 873 874 if (!is_dsc_possible) 875 goto done; 876 877 // Color depth 878 switch (timing->display_color_depth) { 879 case COLOR_DEPTH_888: 880 is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_8_BPC; 881 break; 882 case COLOR_DEPTH_101010: 883 is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_10_BPC; 884 break; 885 case COLOR_DEPTH_121212: 886 is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_12_BPC; 887 break; 888 default: 889 is_dsc_possible = false; 890 } 891 892 if (!is_dsc_possible) 893 goto done; 894 895 // Slice width (i.e. number of slices per line) 896 max_slices_h = get_max_dsc_slices(dsc_common_caps.slice_caps); 897 898 while (max_slices_h > 0) { 899 if (pic_width % max_slices_h == 0) 900 break; 901 902 max_slices_h = dec_num_slices(dsc_common_caps.slice_caps, max_slices_h); 903 } 904 905 is_dsc_possible = (dsc_common_caps.max_slice_width > 0); 906 if (!is_dsc_possible) 907 goto done; 908 909 min_slices_h = pic_width / dsc_common_caps.max_slice_width; 910 if (pic_width % dsc_common_caps.max_slice_width) 911 min_slices_h++; 912 913 min_slices_h = fit_num_slices_up(dsc_common_caps.slice_caps, min_slices_h); 914 915 while (min_slices_h <= max_slices_h) { 916 int pix_clk_per_slice_khz = dsc_div_by_10_round_up(timing->pix_clk_100hz) / min_slices_h; 917 if (pix_clk_per_slice_khz <= sink_per_slice_throughput_mps * 1000) 918 break; 919 920 min_slices_h = inc_num_slices(dsc_common_caps.slice_caps, min_slices_h); 921 } 922 923 is_dsc_possible = (min_slices_h <= max_slices_h); 924 925 if (pic_width % min_slices_h != 0) 926 min_slices_h = 0; // DSC TODO: Maybe try increasing the number of slices first? 927 928 if (min_slices_h == 0 && max_slices_h == 0) 929 is_dsc_possible = false; 930 931 if (!is_dsc_possible) 932 goto done; 933 934 if (policy.use_min_slices_h) { 935 if (min_slices_h > 0) 936 num_slices_h = min_slices_h; 937 else if (max_slices_h > 0) { // Fall back to max slices if min slices is not working out 938 if (policy.max_slices_h) 939 num_slices_h = min(policy.max_slices_h, max_slices_h); 940 else 941 num_slices_h = max_slices_h; 942 } else 943 is_dsc_possible = false; 944 } else { 945 if (max_slices_h > 0) { 946 if (policy.max_slices_h) 947 num_slices_h = min(policy.max_slices_h, max_slices_h); 948 else 949 num_slices_h = max_slices_h; 950 } else if (min_slices_h > 0) // Fall back to min slices if max slices is not possible 951 num_slices_h = min_slices_h; 952 else 953 is_dsc_possible = false; 954 } 955 956 if (!is_dsc_possible) 957 goto done; 958 959 dsc_cfg->num_slices_h = num_slices_h; 960 slice_width = pic_width / num_slices_h; 961 962 is_dsc_possible = slice_width <= dsc_common_caps.max_slice_width; 963 if (!is_dsc_possible) 964 goto done; 965 966 // Slice height (i.e. number of slices per column): start with policy and pick the first one that height is divisible by. 967 // For 4:2:0 make sure the slice height is divisible by 2 as well. 968 if (options->dsc_min_slice_height_override == 0) 969 slice_height = min(policy.min_slice_height, pic_height); 970 else 971 slice_height = min((int)(options->dsc_min_slice_height_override), pic_height); 972 973 while (slice_height < pic_height && (pic_height % slice_height != 0 || 974 slice_height % options->slice_height_granularity != 0 || 975 (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420 && slice_height % 2 != 0))) 976 slice_height++; 977 978 if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) // For the case when pic_height < dsc_policy.min_sice_height 979 is_dsc_possible = (slice_height % 2 == 0); 980 981 if (!is_dsc_possible) 982 goto done; 983 984 dsc_cfg->num_slices_v = pic_height/slice_height; 985 986 if (target_bandwidth_kbps > 0) { 987 is_dsc_possible = decide_dsc_target_bpp_x16( 988 &policy, 989 &dsc_common_caps, 990 target_bandwidth_kbps, 991 timing, 992 num_slices_h, 993 &target_bpp); 994 dsc_cfg->bits_per_pixel = target_bpp; 995 } 996 if (!is_dsc_possible) 997 goto done; 998 999 // Final decission: can we do DSC or not? 1000 if (is_dsc_possible) { 1001 // Fill out the rest of DSC settings 1002 dsc_cfg->block_pred_enable = dsc_common_caps.is_block_pred_supported; 1003 dsc_cfg->linebuf_depth = dsc_common_caps.lb_bit_depth; 1004 dsc_cfg->version_minor = (dsc_common_caps.dsc_version & 0xf0) >> 4; 1005 dsc_cfg->is_dp = dsc_sink_caps->is_dp; 1006 } 1007 1008 done: 1009 if (!is_dsc_possible) 1010 memset(dsc_cfg, 0, sizeof(struct dc_dsc_config)); 1011 1012 return is_dsc_possible; 1013 } 1014 1015 bool dc_dsc_compute_config( 1016 const struct display_stream_compressor *dsc, 1017 const struct dsc_dec_dpcd_caps *dsc_sink_caps, 1018 const struct dc_dsc_config_options *options, 1019 uint32_t target_bandwidth_kbps, 1020 const struct dc_crtc_timing *timing, 1021 struct dc_dsc_config *dsc_cfg) 1022 { 1023 bool is_dsc_possible = false; 1024 struct dsc_enc_caps dsc_enc_caps; 1025 1026 get_dsc_enc_caps(dsc, &dsc_enc_caps, timing->pix_clk_100hz); 1027 is_dsc_possible = setup_dsc_config(dsc_sink_caps, 1028 &dsc_enc_caps, 1029 target_bandwidth_kbps, 1030 timing, options, dsc_cfg); 1031 return is_dsc_possible; 1032 } 1033 1034 uint32_t dc_dsc_stream_bandwidth_in_kbps(const struct dc_crtc_timing *timing, 1035 uint32_t bpp_x16, uint32_t num_slices_h, bool is_dp) 1036 { 1037 uint32_t overhead_in_kbps; 1038 struct fixed31_32 bpp; 1039 struct fixed31_32 actual_bandwidth_in_kbps; 1040 1041 overhead_in_kbps = dc_dsc_stream_bandwidth_overhead_in_kbps( 1042 timing, num_slices_h, is_dp); 1043 bpp = dc_fixpt_from_fraction(bpp_x16, 16); 1044 actual_bandwidth_in_kbps = dc_fixpt_from_fraction(timing->pix_clk_100hz, 10); 1045 actual_bandwidth_in_kbps = dc_fixpt_mul(actual_bandwidth_in_kbps, bpp); 1046 actual_bandwidth_in_kbps = dc_fixpt_add_int(actual_bandwidth_in_kbps, overhead_in_kbps); 1047 return dc_fixpt_ceil(actual_bandwidth_in_kbps); 1048 } 1049 1050 uint32_t dc_dsc_stream_bandwidth_overhead_in_kbps( 1051 const struct dc_crtc_timing *timing, 1052 const int num_slices_h, 1053 const bool is_dp) 1054 { 1055 struct fixed31_32 max_dsc_overhead; 1056 struct fixed31_32 refresh_rate; 1057 1058 if (dsc_policy_disable_dsc_stream_overhead || !is_dp) 1059 return 0; 1060 1061 /* use target bpp that can take entire target bandwidth */ 1062 refresh_rate = dc_fixpt_from_int(timing->pix_clk_100hz); 1063 refresh_rate = dc_fixpt_div_int(refresh_rate, timing->h_total); 1064 refresh_rate = dc_fixpt_div_int(refresh_rate, timing->v_total); 1065 refresh_rate = dc_fixpt_mul_int(refresh_rate, 100); 1066 1067 max_dsc_overhead = dc_fixpt_from_int(num_slices_h); 1068 max_dsc_overhead = dc_fixpt_mul_int(max_dsc_overhead, timing->v_total); 1069 max_dsc_overhead = dc_fixpt_mul_int(max_dsc_overhead, 256); 1070 max_dsc_overhead = dc_fixpt_div_int(max_dsc_overhead, 1000); 1071 max_dsc_overhead = dc_fixpt_mul(max_dsc_overhead, refresh_rate); 1072 1073 return dc_fixpt_ceil(max_dsc_overhead); 1074 } 1075 1076 void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing, 1077 uint32_t max_target_bpp_limit_override_x16, 1078 struct dc_dsc_policy *policy) 1079 { 1080 uint32_t bpc = 0; 1081 1082 policy->min_target_bpp = 0; 1083 policy->max_target_bpp = 0; 1084 1085 /* DSC Policy: Use minimum number of slices that fits the pixel clock */ 1086 policy->use_min_slices_h = true; 1087 1088 /* DSC Policy: Use max available slices 1089 * (in our case 4 for or 8, depending on the mode) 1090 */ 1091 policy->max_slices_h = 0; 1092 1093 /* DSC Policy: Use slice height recommended 1094 * by VESA DSC Spreadsheet user guide 1095 */ 1096 policy->min_slice_height = 108; 1097 1098 /* DSC Policy: follow DP specs with an internal upper limit to 16 bpp 1099 * for better interoperability 1100 */ 1101 switch (timing->display_color_depth) { 1102 case COLOR_DEPTH_888: 1103 bpc = 8; 1104 break; 1105 case COLOR_DEPTH_101010: 1106 bpc = 10; 1107 break; 1108 case COLOR_DEPTH_121212: 1109 bpc = 12; 1110 break; 1111 default: 1112 return; 1113 } 1114 switch (timing->pixel_encoding) { 1115 case PIXEL_ENCODING_RGB: 1116 case PIXEL_ENCODING_YCBCR444: 1117 case PIXEL_ENCODING_YCBCR422: /* assume no YCbCr422 native support */ 1118 /* DP specs limits to 8 */ 1119 policy->min_target_bpp = 8; 1120 /* DP specs limits to 3 x bpc */ 1121 policy->max_target_bpp = 3 * bpc; 1122 break; 1123 case PIXEL_ENCODING_YCBCR420: 1124 /* DP specs limits to 6 */ 1125 policy->min_target_bpp = 6; 1126 /* DP specs limits to 1.5 x bpc assume bpc is an even number */ 1127 policy->max_target_bpp = bpc * 3 / 2; 1128 break; 1129 default: 1130 return; 1131 } 1132 1133 /* internal upper limit, default 16 bpp */ 1134 if (policy->max_target_bpp > dsc_policy_max_target_bpp_limit) 1135 policy->max_target_bpp = dsc_policy_max_target_bpp_limit; 1136 1137 /* apply override */ 1138 if (max_target_bpp_limit_override_x16 && policy->max_target_bpp > max_target_bpp_limit_override_x16 / 16) 1139 policy->max_target_bpp = max_target_bpp_limit_override_x16 / 16; 1140 1141 /* enable DSC when not needed, default false */ 1142 if (dsc_policy_enable_dsc_when_not_needed) 1143 policy->enable_dsc_when_not_needed = dsc_policy_enable_dsc_when_not_needed; 1144 else 1145 policy->enable_dsc_when_not_needed = false; 1146 } 1147 1148 void dc_dsc_policy_set_max_target_bpp_limit(uint32_t limit) 1149 { 1150 dsc_policy_max_target_bpp_limit = limit; 1151 } 1152 1153 void dc_dsc_policy_set_enable_dsc_when_not_needed(bool enable) 1154 { 1155 dsc_policy_enable_dsc_when_not_needed = enable; 1156 } 1157 1158 void dc_dsc_policy_set_disable_dsc_stream_overhead(bool disable) 1159 { 1160 dsc_policy_disable_dsc_stream_overhead = disable; 1161 } 1162 1163 void dc_dsc_get_default_config_option(const struct dc *dc, struct dc_dsc_config_options *options) 1164 { 1165 options->dsc_min_slice_height_override = dc->debug.dsc_min_slice_height_override; 1166 options->max_target_bpp_limit_override_x16 = 0; 1167 options->slice_height_granularity = 1; 1168 } 1169