1 /* $NetBSD: amdgpu_dc_dsc.c,v 1.3 2021/12/19 10:59:02 riastradh Exp $ */
2
3 /*
4 * Copyright 2019 Advanced Micro Devices, Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Author: AMD
25 */
26
27 #include <sys/cdefs.h>
28 __KERNEL_RCSID(0, "$NetBSD: amdgpu_dc_dsc.c,v 1.3 2021/12/19 10:59:02 riastradh Exp $");
29
30 #include "dc_hw_types.h"
31 #include "dsc.h"
32 #include <drm/drm_dp_helper.h>
33 #include "dc.h"
34
35 /* This module's internal functions */
36
37 /* default DSC policy target bitrate limit is 16bpp */
38 static uint32_t dsc_policy_max_target_bpp_limit = 16;
39
dc_dsc_bandwidth_in_kbps_from_timing(const struct dc_crtc_timing * timing)40 static uint32_t dc_dsc_bandwidth_in_kbps_from_timing(
41 const struct dc_crtc_timing *timing)
42 {
43 uint32_t bits_per_channel = 0;
44 uint32_t kbps;
45
46 if (timing->flags.DSC) {
47 kbps = (timing->pix_clk_100hz * timing->dsc_cfg.bits_per_pixel);
48 kbps = kbps / 160 + ((kbps % 160) ? 1 : 0);
49 return kbps;
50 }
51
52 switch (timing->display_color_depth) {
53 case COLOR_DEPTH_666:
54 bits_per_channel = 6;
55 break;
56 case COLOR_DEPTH_888:
57 bits_per_channel = 8;
58 break;
59 case COLOR_DEPTH_101010:
60 bits_per_channel = 10;
61 break;
62 case COLOR_DEPTH_121212:
63 bits_per_channel = 12;
64 break;
65 case COLOR_DEPTH_141414:
66 bits_per_channel = 14;
67 break;
68 case COLOR_DEPTH_161616:
69 bits_per_channel = 16;
70 break;
71 default:
72 break;
73 }
74
75 ASSERT(bits_per_channel != 0);
76
77 kbps = timing->pix_clk_100hz / 10;
78 kbps *= bits_per_channel;
79
80 if (timing->flags.Y_ONLY != 1) {
81 /*Only YOnly make reduce bandwidth by 1/3 compares to RGB*/
82 kbps *= 3;
83 if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
84 kbps /= 2;
85 else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422)
86 kbps = kbps * 2 / 3;
87 }
88
89 return kbps;
90
91 }
92
dsc_buff_block_size_from_dpcd(int dpcd_buff_block_size,int * buff_block_size)93 static bool dsc_buff_block_size_from_dpcd(int dpcd_buff_block_size, int *buff_block_size)
94 {
95
96 switch (dpcd_buff_block_size) {
97 case DP_DSC_RC_BUF_BLK_SIZE_1:
98 *buff_block_size = 1024;
99 break;
100 case DP_DSC_RC_BUF_BLK_SIZE_4:
101 *buff_block_size = 4 * 1024;
102 break;
103 case DP_DSC_RC_BUF_BLK_SIZE_16:
104 *buff_block_size = 16 * 1024;
105 break;
106 case DP_DSC_RC_BUF_BLK_SIZE_64:
107 *buff_block_size = 64 * 1024;
108 break;
109 default: {
110 dm_error("%s: DPCD DSC buffer size not recognized.\n", __func__);
111 return false;
112 }
113 }
114
115 return true;
116 }
117
118
dsc_line_buff_depth_from_dpcd(int dpcd_line_buff_bit_depth,int * line_buff_bit_depth)119 static bool dsc_line_buff_depth_from_dpcd(int dpcd_line_buff_bit_depth, int *line_buff_bit_depth)
120 {
121 if (0 <= dpcd_line_buff_bit_depth && dpcd_line_buff_bit_depth <= 7)
122 *line_buff_bit_depth = dpcd_line_buff_bit_depth + 9;
123 else if (dpcd_line_buff_bit_depth == 8)
124 *line_buff_bit_depth = 8;
125 else {
126 dm_error("%s: DPCD DSC buffer depth not recognized.\n", __func__);
127 return false;
128 }
129
130 return true;
131 }
132
133
dsc_throughput_from_dpcd(int dpcd_throughput,int * throughput)134 static bool dsc_throughput_from_dpcd(int dpcd_throughput, int *throughput)
135 {
136 switch (dpcd_throughput) {
137 case DP_DSC_THROUGHPUT_MODE_0_UPSUPPORTED:
138 *throughput = 0;
139 break;
140 case DP_DSC_THROUGHPUT_MODE_0_170:
141 *throughput = 170;
142 break;
143 case DP_DSC_THROUGHPUT_MODE_0_340:
144 *throughput = 340;
145 break;
146 case DP_DSC_THROUGHPUT_MODE_0_400:
147 *throughput = 400;
148 break;
149 case DP_DSC_THROUGHPUT_MODE_0_450:
150 *throughput = 450;
151 break;
152 case DP_DSC_THROUGHPUT_MODE_0_500:
153 *throughput = 500;
154 break;
155 case DP_DSC_THROUGHPUT_MODE_0_550:
156 *throughput = 550;
157 break;
158 case DP_DSC_THROUGHPUT_MODE_0_600:
159 *throughput = 600;
160 break;
161 case DP_DSC_THROUGHPUT_MODE_0_650:
162 *throughput = 650;
163 break;
164 case DP_DSC_THROUGHPUT_MODE_0_700:
165 *throughput = 700;
166 break;
167 case DP_DSC_THROUGHPUT_MODE_0_750:
168 *throughput = 750;
169 break;
170 case DP_DSC_THROUGHPUT_MODE_0_800:
171 *throughput = 800;
172 break;
173 case DP_DSC_THROUGHPUT_MODE_0_850:
174 *throughput = 850;
175 break;
176 case DP_DSC_THROUGHPUT_MODE_0_900:
177 *throughput = 900;
178 break;
179 case DP_DSC_THROUGHPUT_MODE_0_950:
180 *throughput = 950;
181 break;
182 case DP_DSC_THROUGHPUT_MODE_0_1000:
183 *throughput = 1000;
184 break;
185 default: {
186 dm_error("%s: DPCD DSC throughput mode not recognized.\n", __func__);
187 return false;
188 }
189 }
190
191 return true;
192 }
193
194
dsc_bpp_increment_div_from_dpcd(int bpp_increment_dpcd,uint32_t * bpp_increment_div)195 static bool dsc_bpp_increment_div_from_dpcd(int bpp_increment_dpcd, uint32_t *bpp_increment_div)
196 {
197
198 switch (bpp_increment_dpcd) {
199 case 0:
200 *bpp_increment_div = 16;
201 break;
202 case 1:
203 *bpp_increment_div = 8;
204 break;
205 case 2:
206 *bpp_increment_div = 4;
207 break;
208 case 3:
209 *bpp_increment_div = 2;
210 break;
211 case 4:
212 *bpp_increment_div = 1;
213 break;
214 default: {
215 dm_error("%s: DPCD DSC bits-per-pixel increment not recognized.\n", __func__);
216 return false;
217 }
218 }
219
220 return true;
221 }
222
get_dsc_enc_caps(const struct display_stream_compressor * dsc,struct dsc_enc_caps * dsc_enc_caps,int pixel_clock_100Hz)223 static void get_dsc_enc_caps(
224 const struct display_stream_compressor *dsc,
225 struct dsc_enc_caps *dsc_enc_caps,
226 int pixel_clock_100Hz)
227 {
228 // This is a static HW query, so we can use any DSC
229
230 memset(dsc_enc_caps, 0, sizeof(struct dsc_enc_caps));
231 if (dsc) {
232 if (!dsc->ctx->dc->debug.disable_dsc)
233 dsc->funcs->dsc_get_enc_caps(dsc_enc_caps, pixel_clock_100Hz);
234 if (dsc->ctx->dc->debug.native422_support)
235 dsc_enc_caps->color_formats.bits.YCBCR_NATIVE_422 = 1;
236 }
237 }
238
239 /* Returns 'false' if no intersection was found for at least one capablity.
240 * It also implicitly validates some sink caps against invalid value of zero.
241 */
intersect_dsc_caps(const struct dsc_dec_dpcd_caps * dsc_sink_caps,const struct dsc_enc_caps * dsc_enc_caps,enum dc_pixel_encoding pixel_encoding,struct dsc_enc_caps * dsc_common_caps)242 static bool intersect_dsc_caps(
243 const struct dsc_dec_dpcd_caps *dsc_sink_caps,
244 const struct dsc_enc_caps *dsc_enc_caps,
245 enum dc_pixel_encoding pixel_encoding,
246 struct dsc_enc_caps *dsc_common_caps)
247 {
248 int32_t max_slices;
249 int32_t total_sink_throughput;
250
251 memset(dsc_common_caps, 0, sizeof(struct dsc_enc_caps));
252
253 dsc_common_caps->dsc_version = min(dsc_sink_caps->dsc_version, dsc_enc_caps->dsc_version);
254 if (!dsc_common_caps->dsc_version)
255 return false;
256
257 dsc_common_caps->slice_caps.bits.NUM_SLICES_1 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_1 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_1;
258 dsc_common_caps->slice_caps.bits.NUM_SLICES_2 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_2 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_2;
259 dsc_common_caps->slice_caps.bits.NUM_SLICES_4 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_4 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_4;
260 dsc_common_caps->slice_caps.bits.NUM_SLICES_8 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_8 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_8;
261 if (!dsc_common_caps->slice_caps.raw)
262 return false;
263
264 dsc_common_caps->lb_bit_depth = min(dsc_sink_caps->lb_bit_depth, dsc_enc_caps->lb_bit_depth);
265 if (!dsc_common_caps->lb_bit_depth)
266 return false;
267
268 dsc_common_caps->is_block_pred_supported = dsc_sink_caps->is_block_pred_supported && dsc_enc_caps->is_block_pred_supported;
269
270 dsc_common_caps->color_formats.raw = dsc_sink_caps->color_formats.raw & dsc_enc_caps->color_formats.raw;
271 if (!dsc_common_caps->color_formats.raw)
272 return false;
273
274 dsc_common_caps->color_depth.raw = dsc_sink_caps->color_depth.raw & dsc_enc_caps->color_depth.raw;
275 if (!dsc_common_caps->color_depth.raw)
276 return false;
277
278 max_slices = 0;
279 if (dsc_common_caps->slice_caps.bits.NUM_SLICES_1)
280 max_slices = 1;
281
282 if (dsc_common_caps->slice_caps.bits.NUM_SLICES_2)
283 max_slices = 2;
284
285 if (dsc_common_caps->slice_caps.bits.NUM_SLICES_4)
286 max_slices = 4;
287
288 total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_0_mps;
289 if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420)
290 total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_1_mps;
291
292 dsc_common_caps->max_total_throughput_mps = min(total_sink_throughput, dsc_enc_caps->max_total_throughput_mps);
293
294 dsc_common_caps->max_slice_width = min(dsc_sink_caps->max_slice_width, dsc_enc_caps->max_slice_width);
295 if (!dsc_common_caps->max_slice_width)
296 return false;
297
298 dsc_common_caps->bpp_increment_div = min(dsc_sink_caps->bpp_increment_div, dsc_enc_caps->bpp_increment_div);
299
300 // TODO DSC: Remove this workaround for N422 and 420 once it's fixed, or move it to get_dsc_encoder_caps()
301 if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420)
302 dsc_common_caps->bpp_increment_div = min(dsc_common_caps->bpp_increment_div, (uint32_t)8);
303
304 return true;
305 }
306
dsc_div_by_10_round_up(uint32_t value)307 static inline uint32_t dsc_div_by_10_round_up(uint32_t value)
308 {
309 return (value + 9) / 10;
310 }
311
calc_dsc_bpp_x16(uint32_t stream_bandwidth_kbps,uint32_t pix_clk_100hz,uint32_t bpp_increment_div)312 static inline uint32_t calc_dsc_bpp_x16(uint32_t stream_bandwidth_kbps, uint32_t pix_clk_100hz, uint32_t bpp_increment_div)
313 {
314 #ifdef __NetBSD__
315 panic("what is your float doing in my kernel");
316 #else
317 uint32_t dsc_target_bpp_x16;
318 float f_dsc_target_bpp;
319 float f_stream_bandwidth_100bps = stream_bandwidth_kbps * 10.0f;
320 uint32_t precision = bpp_increment_div; // bpp_increment_div is actually precision
321
322 f_dsc_target_bpp = f_stream_bandwidth_100bps / pix_clk_100hz;
323
324 // Round down to the nearest precision stop to bring it into DSC spec range
325 dsc_target_bpp_x16 = (uint32_t)(f_dsc_target_bpp * precision);
326 dsc_target_bpp_x16 = (dsc_target_bpp_x16 * 16) / precision;
327
328 return dsc_target_bpp_x16;
329 #endif
330 }
331
332 /* Get DSC bandwidth range based on [min_bpp, max_bpp] target bitrate range, and timing's pixel clock
333 * and uncompressed bandwidth.
334 */
get_dsc_bandwidth_range(const uint32_t min_bpp,const uint32_t max_bpp,const struct dsc_enc_caps * dsc_caps,const struct dc_crtc_timing * timing,struct dc_dsc_bw_range * range)335 static void get_dsc_bandwidth_range(
336 const uint32_t min_bpp,
337 const uint32_t max_bpp,
338 const struct dsc_enc_caps *dsc_caps,
339 const struct dc_crtc_timing *timing,
340 struct dc_dsc_bw_range *range)
341 {
342 /* native stream bandwidth */
343 range->stream_kbps = dc_dsc_bandwidth_in_kbps_from_timing(timing);
344
345 /* max dsc target bpp */
346 range->max_kbps = dsc_div_by_10_round_up(max_bpp * timing->pix_clk_100hz);
347 range->max_target_bpp_x16 = max_bpp * 16;
348 if (range->max_kbps > range->stream_kbps) {
349 /* max dsc target bpp is capped to native bandwidth */
350 range->max_kbps = range->stream_kbps;
351 range->max_target_bpp_x16 = calc_dsc_bpp_x16(range->stream_kbps, timing->pix_clk_100hz, dsc_caps->bpp_increment_div);
352 }
353
354 /* min dsc target bpp */
355 range->min_kbps = dsc_div_by_10_round_up(min_bpp * timing->pix_clk_100hz);
356 range->min_target_bpp_x16 = min_bpp * 16;
357 if (range->min_kbps > range->max_kbps) {
358 /* min dsc target bpp is capped to max dsc bandwidth*/
359 range->min_kbps = range->max_kbps;
360 range->min_target_bpp_x16 = range->max_target_bpp_x16;
361 }
362 }
363
364
365 /* Decides if DSC should be used and calculates target bpp if it should, applying DSC policy.
366 *
367 * Returns:
368 * - 'true' if DSC was required by policy and was successfully applied
369 * - 'false' if DSC was not necessary (e.g. if uncompressed stream fits 'target_bandwidth_kbps'),
370 * or if it couldn't be applied based on DSC policy.
371 */
decide_dsc_target_bpp_x16(const struct dc_dsc_policy * policy,const struct dsc_enc_caps * dsc_common_caps,const int target_bandwidth_kbps,const struct dc_crtc_timing * timing,int * target_bpp_x16)372 static bool decide_dsc_target_bpp_x16(
373 const struct dc_dsc_policy *policy,
374 const struct dsc_enc_caps *dsc_common_caps,
375 const int target_bandwidth_kbps,
376 const struct dc_crtc_timing *timing,
377 int *target_bpp_x16)
378 {
379 bool should_use_dsc = false;
380 struct dc_dsc_bw_range range;
381
382 memset(&range, 0, sizeof(range));
383
384 get_dsc_bandwidth_range(policy->min_target_bpp, policy->max_target_bpp,
385 dsc_common_caps, timing, &range);
386 if (target_bandwidth_kbps >= range.stream_kbps) {
387 /* enough bandwidth without dsc */
388 *target_bpp_x16 = 0;
389 should_use_dsc = false;
390 } else if (target_bandwidth_kbps >= range.max_kbps) {
391 /* use max target bpp allowed */
392 *target_bpp_x16 = range.max_target_bpp_x16;
393 should_use_dsc = true;
394 } else if (target_bandwidth_kbps >= range.min_kbps) {
395 /* use target bpp that can take entire target bandwidth */
396 *target_bpp_x16 = calc_dsc_bpp_x16(target_bandwidth_kbps, timing->pix_clk_100hz, dsc_common_caps->bpp_increment_div);
397 should_use_dsc = true;
398 } else {
399 /* not enough bandwidth to fulfill minimum requirement */
400 *target_bpp_x16 = 0;
401 should_use_dsc = false;
402 }
403
404 return should_use_dsc;
405 }
406
407 #define MIN_AVAILABLE_SLICES_SIZE 4
408
get_available_dsc_slices(union dsc_enc_slice_caps slice_caps,int * available_slices)409 static int get_available_dsc_slices(union dsc_enc_slice_caps slice_caps, int *available_slices)
410 {
411 int idx = 0;
412
413 memset(available_slices, -1, MIN_AVAILABLE_SLICES_SIZE);
414
415 if (slice_caps.bits.NUM_SLICES_1)
416 available_slices[idx++] = 1;
417
418 if (slice_caps.bits.NUM_SLICES_2)
419 available_slices[idx++] = 2;
420
421 if (slice_caps.bits.NUM_SLICES_4)
422 available_slices[idx++] = 4;
423
424 if (slice_caps.bits.NUM_SLICES_8)
425 available_slices[idx++] = 8;
426
427 return idx;
428 }
429
430
get_max_dsc_slices(union dsc_enc_slice_caps slice_caps)431 static int get_max_dsc_slices(union dsc_enc_slice_caps slice_caps)
432 {
433 int max_slices = 0;
434 int available_slices[MIN_AVAILABLE_SLICES_SIZE];
435 int end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
436
437 if (end_idx > 0)
438 max_slices = available_slices[end_idx - 1];
439
440 return max_slices;
441 }
442
443
444 // Increment sice number in available sice numbers stops if possible, or just increment if not
inc_num_slices(union dsc_enc_slice_caps slice_caps,int num_slices)445 static int inc_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices)
446 {
447 // Get next bigger num slices available in common caps
448 int available_slices[MIN_AVAILABLE_SLICES_SIZE];
449 int end_idx;
450 int i;
451 int new_num_slices = num_slices;
452
453 end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
454 if (end_idx == 0) {
455 // No available slices found
456 new_num_slices++;
457 return new_num_slices;
458 }
459
460 // Numbers of slices found - get the next bigger number
461 for (i = 0; i < end_idx; i++) {
462 if (new_num_slices < available_slices[i]) {
463 new_num_slices = available_slices[i];
464 break;
465 }
466 }
467
468 if (new_num_slices == num_slices) // No biger number of slices found
469 new_num_slices++;
470
471 return new_num_slices;
472 }
473
474
475 // Decrement sice number in available sice numbers stops if possible, or just decrement if not. Stop at zero.
dec_num_slices(union dsc_enc_slice_caps slice_caps,int num_slices)476 static int dec_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices)
477 {
478 // Get next bigger num slices available in common caps
479 int available_slices[MIN_AVAILABLE_SLICES_SIZE];
480 int end_idx;
481 int i;
482 int new_num_slices = num_slices;
483
484 end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
485 if (end_idx == 0 && new_num_slices > 0) {
486 // No numbers of slices found
487 new_num_slices++;
488 return new_num_slices;
489 }
490
491 // Numbers of slices found - get the next smaller number
492 for (i = end_idx - 1; i >= 0; i--) {
493 if (new_num_slices > available_slices[i]) {
494 new_num_slices = available_slices[i];
495 break;
496 }
497 }
498
499 if (new_num_slices == num_slices) {
500 // No smaller number of slices found
501 new_num_slices--;
502 if (new_num_slices < 0)
503 new_num_slices = 0;
504 }
505
506 return new_num_slices;
507 }
508
509
510 // Choose next bigger number of slices if the requested number of slices is not available
fit_num_slices_up(union dsc_enc_slice_caps slice_caps,int num_slices)511 static int fit_num_slices_up(union dsc_enc_slice_caps slice_caps, int num_slices)
512 {
513 // Get next bigger num slices available in common caps
514 int available_slices[MIN_AVAILABLE_SLICES_SIZE];
515 int end_idx;
516 int i;
517 int new_num_slices = num_slices;
518
519 end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
520 if (end_idx == 0) {
521 // No available slices found
522 new_num_slices++;
523 return new_num_slices;
524 }
525
526 // Numbers of slices found - get the equal or next bigger number
527 for (i = 0; i < end_idx; i++) {
528 if (new_num_slices <= available_slices[i]) {
529 new_num_slices = available_slices[i];
530 break;
531 }
532 }
533
534 return new_num_slices;
535 }
536
537
538 /* Attempts to set DSC configuration for the stream, applying DSC policy.
539 * Returns 'true' if successful or 'false' if not.
540 *
541 * Parameters:
542 *
543 * dsc_sink_caps - DSC sink decoder capabilities (from DPCD)
544 *
545 * dsc_enc_caps - DSC encoder capabilities
546 *
547 * target_bandwidth_kbps - Target bandwidth to fit the stream into.
548 * If 0, do not calculate target bpp.
549 *
550 * timing - The stream timing to fit into 'target_bandwidth_kbps' or apply
551 * maximum compression to, if 'target_badwidth == 0'
552 *
553 * dsc_cfg - DSC configuration to use if it was possible to come up with
554 * one for the given inputs.
555 * The target bitrate after DSC can be calculated by multiplying
556 * dsc_cfg.bits_per_pixel (in U6.4 format) by pixel rate, e.g.
557 *
558 * dsc_stream_bitrate_kbps = (int)ceil(timing->pix_clk_khz * dsc_cfg.bits_per_pixel / 16.0);
559 */
setup_dsc_config(const struct dsc_dec_dpcd_caps * dsc_sink_caps,const struct dsc_enc_caps * dsc_enc_caps,int target_bandwidth_kbps,const struct dc_crtc_timing * timing,int min_slice_height_override,struct dc_dsc_config * dsc_cfg)560 static bool setup_dsc_config(
561 const struct dsc_dec_dpcd_caps *dsc_sink_caps,
562 const struct dsc_enc_caps *dsc_enc_caps,
563 int target_bandwidth_kbps,
564 const struct dc_crtc_timing *timing,
565 int min_slice_height_override,
566 struct dc_dsc_config *dsc_cfg)
567 {
568 struct dsc_enc_caps dsc_common_caps;
569 int max_slices_h;
570 int min_slices_h;
571 int num_slices_h;
572 int pic_width;
573 int slice_width;
574 int target_bpp;
575 int sink_per_slice_throughput_mps;
576 int branch_max_throughput_mps = 0;
577 bool is_dsc_possible = false;
578 int pic_height;
579 int slice_height;
580 struct dc_dsc_policy policy;
581
582 memset(dsc_cfg, 0, sizeof(struct dc_dsc_config));
583
584 dc_dsc_get_policy_for_timing(timing, &policy);
585 pic_width = timing->h_addressable + timing->h_border_left + timing->h_border_right;
586 pic_height = timing->v_addressable + timing->v_border_top + timing->v_border_bottom;
587
588 if (!dsc_sink_caps->is_dsc_supported)
589 goto done;
590
591 if (dsc_sink_caps->branch_max_line_width && dsc_sink_caps->branch_max_line_width < pic_width)
592 goto done;
593
594 // Intersect decoder with encoder DSC caps and validate DSC settings
595 is_dsc_possible = intersect_dsc_caps(dsc_sink_caps, dsc_enc_caps, timing->pixel_encoding, &dsc_common_caps);
596 if (!is_dsc_possible)
597 goto done;
598
599 if (target_bandwidth_kbps > 0) {
600 is_dsc_possible = decide_dsc_target_bpp_x16(
601 &policy,
602 &dsc_common_caps,
603 target_bandwidth_kbps,
604 timing,
605 &target_bpp);
606 dsc_cfg->bits_per_pixel = target_bpp;
607 }
608 if (!is_dsc_possible)
609 goto done;
610
611 sink_per_slice_throughput_mps = 0;
612
613 // Validate available DSC settings against the mode timing
614
615 // Validate color format (and pick up the throughput values)
616 dsc_cfg->ycbcr422_simple = false;
617 switch (timing->pixel_encoding) {
618 case PIXEL_ENCODING_RGB:
619 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.RGB;
620 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps;
621 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_0_mps;
622 break;
623 case PIXEL_ENCODING_YCBCR444:
624 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_444;
625 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps;
626 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_0_mps;
627 break;
628 case PIXEL_ENCODING_YCBCR422:
629 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_422;
630 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_1_mps;
631 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_1_mps;
632 if (!is_dsc_possible) {
633 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_SIMPLE_422;
634 dsc_cfg->ycbcr422_simple = is_dsc_possible;
635 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps;
636 }
637 break;
638 case PIXEL_ENCODING_YCBCR420:
639 is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_420;
640 sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_1_mps;
641 branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_1_mps;
642 break;
643 default:
644 is_dsc_possible = false;
645 }
646
647 // Validate branch's maximum throughput
648 if (branch_max_throughput_mps && dsc_div_by_10_round_up(timing->pix_clk_100hz) > branch_max_throughput_mps * 1000)
649 is_dsc_possible = false;
650
651 if (!is_dsc_possible)
652 goto done;
653
654 // Color depth
655 switch (timing->display_color_depth) {
656 case COLOR_DEPTH_888:
657 is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_8_BPC;
658 break;
659 case COLOR_DEPTH_101010:
660 is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_10_BPC;
661 break;
662 case COLOR_DEPTH_121212:
663 is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_12_BPC;
664 break;
665 default:
666 is_dsc_possible = false;
667 }
668
669 if (!is_dsc_possible)
670 goto done;
671
672 // Slice width (i.e. number of slices per line)
673 max_slices_h = get_max_dsc_slices(dsc_common_caps.slice_caps);
674
675 while (max_slices_h > 0) {
676 if (pic_width % max_slices_h == 0)
677 break;
678
679 max_slices_h = dec_num_slices(dsc_common_caps.slice_caps, max_slices_h);
680 }
681
682 is_dsc_possible = (dsc_common_caps.max_slice_width > 0);
683 if (!is_dsc_possible)
684 goto done;
685
686 min_slices_h = pic_width / dsc_common_caps.max_slice_width;
687 if (pic_width % dsc_common_caps.max_slice_width)
688 min_slices_h++;
689
690 min_slices_h = fit_num_slices_up(dsc_common_caps.slice_caps, min_slices_h);
691
692 while (min_slices_h <= max_slices_h) {
693 int pix_clk_per_slice_khz = dsc_div_by_10_round_up(timing->pix_clk_100hz) / min_slices_h;
694 if (pix_clk_per_slice_khz <= sink_per_slice_throughput_mps * 1000)
695 break;
696
697 min_slices_h = inc_num_slices(dsc_common_caps.slice_caps, min_slices_h);
698 }
699
700 if (pic_width % min_slices_h != 0)
701 min_slices_h = 0; // DSC TODO: Maybe try increasing the number of slices first?
702
703 is_dsc_possible = (min_slices_h <= max_slices_h);
704 if (!is_dsc_possible)
705 goto done;
706
707 if (policy.use_min_slices_h) {
708 if (min_slices_h > 0)
709 num_slices_h = min_slices_h;
710 else if (max_slices_h > 0) { // Fall back to max slices if min slices is not working out
711 if (policy.max_slices_h)
712 num_slices_h = min(policy.max_slices_h, max_slices_h);
713 else
714 num_slices_h = max_slices_h;
715 } else
716 is_dsc_possible = false;
717 } else {
718 if (max_slices_h > 0) {
719 if (policy.max_slices_h)
720 num_slices_h = min(policy.max_slices_h, max_slices_h);
721 else
722 num_slices_h = max_slices_h;
723 } else if (min_slices_h > 0) // Fall back to min slices if max slices is not possible
724 num_slices_h = min_slices_h;
725 else
726 is_dsc_possible = false;
727 }
728
729 if (!is_dsc_possible)
730 goto done;
731
732 dsc_cfg->num_slices_h = num_slices_h;
733 slice_width = pic_width / num_slices_h;
734
735 is_dsc_possible = slice_width <= dsc_common_caps.max_slice_width;
736 if (!is_dsc_possible)
737 goto done;
738
739 // Slice height (i.e. number of slices per column): start with policy and pick the first one that height is divisible by.
740 // For 4:2:0 make sure the slice height is divisible by 2 as well.
741 if (min_slice_height_override == 0)
742 slice_height = min(policy.min_slice_height, pic_height);
743 else
744 slice_height = min(min_slice_height_override, pic_height);
745
746 while (slice_height < pic_height && (pic_height % slice_height != 0 ||
747 (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420 && slice_height % 2 != 0)))
748 slice_height++;
749
750 if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) // For the case when pic_height < dsc_policy.min_sice_height
751 is_dsc_possible = (slice_height % 2 == 0);
752
753 if (!is_dsc_possible)
754 goto done;
755
756 dsc_cfg->num_slices_v = pic_height/slice_height;
757
758 // Final decission: can we do DSC or not?
759 if (is_dsc_possible) {
760 // Fill out the rest of DSC settings
761 dsc_cfg->block_pred_enable = dsc_common_caps.is_block_pred_supported;
762 dsc_cfg->linebuf_depth = dsc_common_caps.lb_bit_depth;
763 dsc_cfg->version_minor = (dsc_common_caps.dsc_version & 0xf0) >> 4;
764 }
765
766 done:
767 if (!is_dsc_possible)
768 memset(dsc_cfg, 0, sizeof(struct dc_dsc_config));
769
770 return is_dsc_possible;
771 }
772
dc_dsc_parse_dsc_dpcd(const struct dc * dc,const uint8_t * dpcd_dsc_basic_data,const uint8_t * dpcd_dsc_ext_data,struct dsc_dec_dpcd_caps * dsc_sink_caps)773 bool dc_dsc_parse_dsc_dpcd(const struct dc *dc, const uint8_t *dpcd_dsc_basic_data, const uint8_t *dpcd_dsc_ext_data, struct dsc_dec_dpcd_caps *dsc_sink_caps)
774 {
775 if (!dpcd_dsc_basic_data)
776 return false;
777
778 dsc_sink_caps->is_dsc_supported = (dpcd_dsc_basic_data[DP_DSC_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED) != 0;
779 if (!dsc_sink_caps->is_dsc_supported)
780 return false;
781
782 dsc_sink_caps->dsc_version = dpcd_dsc_basic_data[DP_DSC_REV - DP_DSC_SUPPORT];
783
784 {
785 int buff_block_size;
786 int buff_size;
787
788 if (!dsc_buff_block_size_from_dpcd(dpcd_dsc_basic_data[DP_DSC_RC_BUF_BLK_SIZE - DP_DSC_SUPPORT], &buff_block_size))
789 return false;
790
791 buff_size = dpcd_dsc_basic_data[DP_DSC_RC_BUF_SIZE - DP_DSC_SUPPORT] + 1;
792 dsc_sink_caps->rc_buffer_size = buff_size * buff_block_size;
793 }
794
795 dsc_sink_caps->slice_caps1.raw = dpcd_dsc_basic_data[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
796 if (!dsc_line_buff_depth_from_dpcd(dpcd_dsc_basic_data[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT], &dsc_sink_caps->lb_bit_depth))
797 return false;
798
799 dsc_sink_caps->is_block_pred_supported =
800 (dpcd_dsc_basic_data[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_BLK_PREDICTION_IS_SUPPORTED) != 0;
801
802 dsc_sink_caps->edp_max_bits_per_pixel =
803 dpcd_dsc_basic_data[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
804 dpcd_dsc_basic_data[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] << 8;
805
806 dsc_sink_caps->color_formats.raw = dpcd_dsc_basic_data[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT];
807 dsc_sink_caps->color_depth.raw = dpcd_dsc_basic_data[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
808
809 {
810 int dpcd_throughput = dpcd_dsc_basic_data[DP_DSC_PEAK_THROUGHPUT - DP_DSC_SUPPORT];
811
812 if (!dsc_throughput_from_dpcd(dpcd_throughput & DP_DSC_THROUGHPUT_MODE_0_MASK, &dsc_sink_caps->throughput_mode_0_mps))
813 return false;
814
815 dpcd_throughput = (dpcd_throughput & DP_DSC_THROUGHPUT_MODE_1_MASK) >> DP_DSC_THROUGHPUT_MODE_1_SHIFT;
816 if (!dsc_throughput_from_dpcd(dpcd_throughput, &dsc_sink_caps->throughput_mode_1_mps))
817 return false;
818 }
819
820 dsc_sink_caps->max_slice_width = dpcd_dsc_basic_data[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] * 320;
821 dsc_sink_caps->slice_caps2.raw = dpcd_dsc_basic_data[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
822
823 if (!dsc_bpp_increment_div_from_dpcd(dpcd_dsc_basic_data[DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT], &dsc_sink_caps->bpp_increment_div))
824 return false;
825
826 if (dc->debug.dsc_bpp_increment_div) {
827 /* dsc_bpp_increment_div should onl be 1, 2, 4, 8 or 16, but rather than rejecting invalid values,
828 * we'll accept all and get it into range. This also makes the above check against 0 redundant,
829 * but that one stresses out the override will be only used if it's not 0.
830 */
831 if (dc->debug.dsc_bpp_increment_div >= 1)
832 dsc_sink_caps->bpp_increment_div = 1;
833 if (dc->debug.dsc_bpp_increment_div >= 2)
834 dsc_sink_caps->bpp_increment_div = 2;
835 if (dc->debug.dsc_bpp_increment_div >= 4)
836 dsc_sink_caps->bpp_increment_div = 4;
837 if (dc->debug.dsc_bpp_increment_div >= 8)
838 dsc_sink_caps->bpp_increment_div = 8;
839 if (dc->debug.dsc_bpp_increment_div >= 16)
840 dsc_sink_caps->bpp_increment_div = 16;
841 }
842
843 /* Extended caps */
844 if (dpcd_dsc_ext_data == NULL) { // Extended DPCD DSC data can be null, e.g. because it doesn't apply to SST
845 dsc_sink_caps->branch_overall_throughput_0_mps = 0;
846 dsc_sink_caps->branch_overall_throughput_1_mps = 0;
847 dsc_sink_caps->branch_max_line_width = 0;
848 return true;
849 }
850
851 dsc_sink_caps->branch_overall_throughput_0_mps = dpcd_dsc_ext_data[DP_DSC_BRANCH_OVERALL_THROUGHPUT_0 - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0];
852 if (dsc_sink_caps->branch_overall_throughput_0_mps == 0)
853 dsc_sink_caps->branch_overall_throughput_0_mps = 0;
854 else if (dsc_sink_caps->branch_overall_throughput_0_mps == 1)
855 dsc_sink_caps->branch_overall_throughput_0_mps = 680;
856 else {
857 dsc_sink_caps->branch_overall_throughput_0_mps *= 50;
858 dsc_sink_caps->branch_overall_throughput_0_mps += 600;
859 }
860
861 dsc_sink_caps->branch_overall_throughput_1_mps = dpcd_dsc_ext_data[DP_DSC_BRANCH_OVERALL_THROUGHPUT_1 - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0];
862 if (dsc_sink_caps->branch_overall_throughput_1_mps == 0)
863 dsc_sink_caps->branch_overall_throughput_1_mps = 0;
864 else if (dsc_sink_caps->branch_overall_throughput_1_mps == 1)
865 dsc_sink_caps->branch_overall_throughput_1_mps = 680;
866 else {
867 dsc_sink_caps->branch_overall_throughput_1_mps *= 50;
868 dsc_sink_caps->branch_overall_throughput_1_mps += 600;
869 }
870
871 dsc_sink_caps->branch_max_line_width = dpcd_dsc_ext_data[DP_DSC_BRANCH_MAX_LINE_WIDTH - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0] * 320;
872 ASSERT(dsc_sink_caps->branch_max_line_width == 0 || dsc_sink_caps->branch_max_line_width >= 5120);
873
874 return true;
875 }
876
877
878 /* If DSC is possbile, get DSC bandwidth range based on [min_bpp, max_bpp] target bitrate range and
879 * timing's pixel clock and uncompressed bandwidth.
880 * If DSC is not possible, leave '*range' untouched.
881 */
dc_dsc_compute_bandwidth_range(const struct display_stream_compressor * dsc,const uint32_t dsc_min_slice_height_override,const uint32_t min_bpp,const uint32_t max_bpp,const struct dsc_dec_dpcd_caps * dsc_sink_caps,const struct dc_crtc_timing * timing,struct dc_dsc_bw_range * range)882 bool dc_dsc_compute_bandwidth_range(
883 const struct display_stream_compressor *dsc,
884 const uint32_t dsc_min_slice_height_override,
885 const uint32_t min_bpp,
886 const uint32_t max_bpp,
887 const struct dsc_dec_dpcd_caps *dsc_sink_caps,
888 const struct dc_crtc_timing *timing,
889 struct dc_dsc_bw_range *range)
890 {
891 bool is_dsc_possible = false;
892 struct dsc_enc_caps dsc_enc_caps;
893 struct dsc_enc_caps dsc_common_caps;
894 struct dc_dsc_config config;
895
896 get_dsc_enc_caps(dsc, &dsc_enc_caps, timing->pix_clk_100hz);
897
898 is_dsc_possible = intersect_dsc_caps(dsc_sink_caps, &dsc_enc_caps,
899 timing->pixel_encoding, &dsc_common_caps);
900
901 if (is_dsc_possible)
902 is_dsc_possible = setup_dsc_config(dsc_sink_caps, &dsc_enc_caps, 0, timing,
903 dsc_min_slice_height_override, &config);
904
905 if (is_dsc_possible)
906 get_dsc_bandwidth_range(min_bpp, max_bpp, &dsc_common_caps, timing, range);
907
908 return is_dsc_possible;
909 }
910
dc_dsc_compute_config(const struct display_stream_compressor * dsc,const struct dsc_dec_dpcd_caps * dsc_sink_caps,const uint32_t dsc_min_slice_height_override,uint32_t target_bandwidth_kbps,const struct dc_crtc_timing * timing,struct dc_dsc_config * dsc_cfg)911 bool dc_dsc_compute_config(
912 const struct display_stream_compressor *dsc,
913 const struct dsc_dec_dpcd_caps *dsc_sink_caps,
914 const uint32_t dsc_min_slice_height_override,
915 uint32_t target_bandwidth_kbps,
916 const struct dc_crtc_timing *timing,
917 struct dc_dsc_config *dsc_cfg)
918 {
919 bool is_dsc_possible = false;
920 struct dsc_enc_caps dsc_enc_caps;
921
922 get_dsc_enc_caps(dsc, &dsc_enc_caps, timing->pix_clk_100hz);
923 is_dsc_possible = setup_dsc_config(dsc_sink_caps,
924 &dsc_enc_caps,
925 target_bandwidth_kbps,
926 timing, dsc_min_slice_height_override, dsc_cfg);
927 return is_dsc_possible;
928 }
929
dc_dsc_get_policy_for_timing(const struct dc_crtc_timing * timing,struct dc_dsc_policy * policy)930 void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing, struct dc_dsc_policy *policy)
931 {
932 uint32_t bpc = 0;
933
934 policy->min_target_bpp = 0;
935 policy->max_target_bpp = 0;
936
937 /* DSC Policy: Use minimum number of slices that fits the pixel clock */
938 policy->use_min_slices_h = true;
939
940 /* DSC Policy: Use max available slices
941 * (in our case 4 for or 8, depending on the mode)
942 */
943 policy->max_slices_h = 0;
944
945 /* DSC Policy: Use slice height recommended
946 * by VESA DSC Spreadsheet user guide
947 */
948 policy->min_slice_height = 108;
949
950 /* DSC Policy: follow DP specs with an internal upper limit to 16 bpp
951 * for better interoperability
952 */
953 switch (timing->display_color_depth) {
954 case COLOR_DEPTH_888:
955 bpc = 8;
956 break;
957 case COLOR_DEPTH_101010:
958 bpc = 10;
959 break;
960 case COLOR_DEPTH_121212:
961 bpc = 12;
962 break;
963 default:
964 return;
965 }
966 switch (timing->pixel_encoding) {
967 case PIXEL_ENCODING_RGB:
968 case PIXEL_ENCODING_YCBCR444:
969 case PIXEL_ENCODING_YCBCR422: /* assume no YCbCr422 native support */
970 /* DP specs limits to 8 */
971 policy->min_target_bpp = 8;
972 /* DP specs limits to 3 x bpc */
973 policy->max_target_bpp = 3 * bpc;
974 break;
975 case PIXEL_ENCODING_YCBCR420:
976 /* DP specs limits to 6 */
977 policy->min_target_bpp = 6;
978 /* DP specs limits to 1.5 x bpc assume bpc is an even number */
979 policy->max_target_bpp = bpc * 3 / 2;
980 break;
981 default:
982 return;
983 }
984 /* internal upper limit, default 16 bpp */
985 if (policy->max_target_bpp > dsc_policy_max_target_bpp_limit)
986 policy->max_target_bpp = dsc_policy_max_target_bpp_limit;
987 }
988
dc_dsc_policy_set_max_target_bpp_limit(uint32_t limit)989 void dc_dsc_policy_set_max_target_bpp_limit(uint32_t limit)
990 {
991 dsc_policy_max_target_bpp_limit = limit;
992 }
993