]> Git Repo - linux.git/blob - drivers/gpu/drm/msm/dp/dp_link.c
Merge tag 'input-for-v6.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor...
[linux.git] / drivers / gpu / drm / msm / dp / dp_link.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
4  */
5
6 #define pr_fmt(fmt)     "[drm-dp] %s: " fmt, __func__
7
8 #include <drm/drm_print.h>
9
10 #include "dp_link.h"
11 #include "dp_panel.h"
12
13 #define DP_TEST_REQUEST_MASK            0x7F
14
15 enum audio_sample_rate {
16         AUDIO_SAMPLE_RATE_32_KHZ        = 0x00,
17         AUDIO_SAMPLE_RATE_44_1_KHZ      = 0x01,
18         AUDIO_SAMPLE_RATE_48_KHZ        = 0x02,
19         AUDIO_SAMPLE_RATE_88_2_KHZ      = 0x03,
20         AUDIO_SAMPLE_RATE_96_KHZ        = 0x04,
21         AUDIO_SAMPLE_RATE_176_4_KHZ     = 0x05,
22         AUDIO_SAMPLE_RATE_192_KHZ       = 0x06,
23 };
24
25 enum audio_pattern_type {
26         AUDIO_TEST_PATTERN_OPERATOR_DEFINED     = 0x00,
27         AUDIO_TEST_PATTERN_SAWTOOTH             = 0x01,
28 };
29
30 struct dp_link_request {
31         u32 test_requested;
32         u32 test_link_rate;
33         u32 test_lane_count;
34 };
35
36 struct dp_link_private {
37         u32 prev_sink_count;
38         struct device *dev;
39         struct drm_device *drm_dev;
40         struct drm_dp_aux *aux;
41         struct dp_link dp_link;
42
43         struct dp_link_request request;
44         struct mutex psm_mutex;
45         u8 link_status[DP_LINK_STATUS_SIZE];
46 };
47
48 static int dp_aux_link_power_up(struct drm_dp_aux *aux,
49                                         struct dp_link_info *link)
50 {
51         u8 value;
52         ssize_t len;
53         int i;
54
55         if (link->revision < 0x11)
56                 return 0;
57
58         len = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
59         if (len < 0)
60                 return len;
61
62         value &= ~DP_SET_POWER_MASK;
63         value |= DP_SET_POWER_D0;
64
65         /* retry for 1ms to give the sink time to wake up */
66         for (i = 0; i < 3; i++) {
67                 len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
68                 usleep_range(1000, 2000);
69                 if (len == 1)
70                         break;
71         }
72
73         return 0;
74 }
75
76 static int dp_aux_link_power_down(struct drm_dp_aux *aux,
77                                         struct dp_link_info *link)
78 {
79         u8 value;
80         int err;
81
82         if (link->revision < 0x11)
83                 return 0;
84
85         err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
86         if (err < 0)
87                 return err;
88
89         value &= ~DP_SET_POWER_MASK;
90         value |= DP_SET_POWER_D3;
91
92         err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
93         if (err < 0)
94                 return err;
95
96         return 0;
97 }
98
99 static int dp_link_get_period(struct dp_link_private *link, int const addr)
100 {
101         int ret = 0;
102         u8 data;
103         u32 const max_audio_period = 0xA;
104
105         /* TEST_AUDIO_PERIOD_CH_XX */
106         if (drm_dp_dpcd_readb(link->aux, addr, &data) < 0) {
107                 DRM_ERROR("failed to read test_audio_period (0x%x)\n", addr);
108                 ret = -EINVAL;
109                 goto exit;
110         }
111
112         /* Period - Bits 3:0 */
113         data = data & 0xF;
114         if ((int)data > max_audio_period) {
115                 DRM_ERROR("invalid test_audio_period_ch_1 = 0x%x\n", data);
116                 ret = -EINVAL;
117                 goto exit;
118         }
119
120         ret = data;
121 exit:
122         return ret;
123 }
124
125 static int dp_link_parse_audio_channel_period(struct dp_link_private *link)
126 {
127         int ret = 0;
128         struct dp_link_test_audio *req = &link->dp_link.test_audio;
129
130         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH1);
131         if (ret == -EINVAL)
132                 goto exit;
133
134         req->test_audio_period_ch_1 = ret;
135         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_1 = 0x%x\n", ret);
136
137         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH2);
138         if (ret == -EINVAL)
139                 goto exit;
140
141         req->test_audio_period_ch_2 = ret;
142         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_2 = 0x%x\n", ret);
143
144         /* TEST_AUDIO_PERIOD_CH_3 (Byte 0x275) */
145         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH3);
146         if (ret == -EINVAL)
147                 goto exit;
148
149         req->test_audio_period_ch_3 = ret;
150         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_3 = 0x%x\n", ret);
151
152         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH4);
153         if (ret == -EINVAL)
154                 goto exit;
155
156         req->test_audio_period_ch_4 = ret;
157         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_4 = 0x%x\n", ret);
158
159         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH5);
160         if (ret == -EINVAL)
161                 goto exit;
162
163         req->test_audio_period_ch_5 = ret;
164         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_5 = 0x%x\n", ret);
165
166         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH6);
167         if (ret == -EINVAL)
168                 goto exit;
169
170         req->test_audio_period_ch_6 = ret;
171         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_6 = 0x%x\n", ret);
172
173         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH7);
174         if (ret == -EINVAL)
175                 goto exit;
176
177         req->test_audio_period_ch_7 = ret;
178         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_7 = 0x%x\n", ret);
179
180         ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH8);
181         if (ret == -EINVAL)
182                 goto exit;
183
184         req->test_audio_period_ch_8 = ret;
185         drm_dbg_dp(link->drm_dev, "test_audio_period_ch_8 = 0x%x\n", ret);
186 exit:
187         return ret;
188 }
189
190 static int dp_link_parse_audio_pattern_type(struct dp_link_private *link)
191 {
192         int ret = 0;
193         u8 data;
194         ssize_t rlen;
195         int const max_audio_pattern_type = 0x1;
196
197         rlen = drm_dp_dpcd_readb(link->aux,
198                                 DP_TEST_AUDIO_PATTERN_TYPE, &data);
199         if (rlen < 0) {
200                 DRM_ERROR("failed to read link audio mode. rlen=%zd\n", rlen);
201                 return rlen;
202         }
203
204         /* Audio Pattern Type - Bits 7:0 */
205         if ((int)data > max_audio_pattern_type) {
206                 DRM_ERROR("invalid audio pattern type = 0x%x\n", data);
207                 ret = -EINVAL;
208                 goto exit;
209         }
210
211         link->dp_link.test_audio.test_audio_pattern_type = data;
212         drm_dbg_dp(link->drm_dev, "audio pattern type = 0x%x\n", data);
213 exit:
214         return ret;
215 }
216
217 static int dp_link_parse_audio_mode(struct dp_link_private *link)
218 {
219         int ret = 0;
220         u8 data;
221         ssize_t rlen;
222         int const max_audio_sampling_rate = 0x6;
223         int const max_audio_channel_count = 0x8;
224         int sampling_rate = 0x0;
225         int channel_count = 0x0;
226
227         rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_AUDIO_MODE, &data);
228         if (rlen < 0) {
229                 DRM_ERROR("failed to read link audio mode. rlen=%zd\n", rlen);
230                 return rlen;
231         }
232
233         /* Sampling Rate - Bits 3:0 */
234         sampling_rate = data & 0xF;
235         if (sampling_rate > max_audio_sampling_rate) {
236                 DRM_ERROR("sampling rate (0x%x) greater than max (0x%x)\n",
237                                 sampling_rate, max_audio_sampling_rate);
238                 ret = -EINVAL;
239                 goto exit;
240         }
241
242         /* Channel Count - Bits 7:4 */
243         channel_count = ((data & 0xF0) >> 4) + 1;
244         if (channel_count > max_audio_channel_count) {
245                 DRM_ERROR("channel_count (0x%x) greater than max (0x%x)\n",
246                                 channel_count, max_audio_channel_count);
247                 ret = -EINVAL;
248                 goto exit;
249         }
250
251         link->dp_link.test_audio.test_audio_sampling_rate = sampling_rate;
252         link->dp_link.test_audio.test_audio_channel_count = channel_count;
253         drm_dbg_dp(link->drm_dev,
254                         "sampling_rate = 0x%x, channel_count = 0x%x\n",
255                         sampling_rate, channel_count);
256 exit:
257         return ret;
258 }
259
260 static int dp_link_parse_audio_pattern_params(struct dp_link_private *link)
261 {
262         int ret = 0;
263
264         ret = dp_link_parse_audio_mode(link);
265         if (ret)
266                 goto exit;
267
268         ret = dp_link_parse_audio_pattern_type(link);
269         if (ret)
270                 goto exit;
271
272         ret = dp_link_parse_audio_channel_period(link);
273
274 exit:
275         return ret;
276 }
277
278 static bool dp_link_is_video_pattern_valid(u32 pattern)
279 {
280         switch (pattern) {
281         case DP_NO_TEST_PATTERN:
282         case DP_COLOR_RAMP:
283         case DP_BLACK_AND_WHITE_VERTICAL_LINES:
284         case DP_COLOR_SQUARE:
285                 return true;
286         default:
287                 return false;
288         }
289 }
290
291 /**
292  * dp_link_is_bit_depth_valid() - validates the bit depth requested
293  * @tbd: bit depth requested by the sink
294  *
295  * Returns true if the requested bit depth is supported.
296  */
297 static bool dp_link_is_bit_depth_valid(u32 tbd)
298 {
299         /* DP_TEST_VIDEO_PATTERN_NONE is treated as invalid */
300         switch (tbd) {
301         case DP_TEST_BIT_DEPTH_6:
302         case DP_TEST_BIT_DEPTH_8:
303         case DP_TEST_BIT_DEPTH_10:
304                 return true;
305         default:
306                 return false;
307         }
308 }
309
310 static int dp_link_parse_timing_params1(struct dp_link_private *link,
311                                         int addr, int len, u32 *val)
312 {
313         u8 bp[2];
314         int rlen;
315
316         if (len != 2)
317                 return -EINVAL;
318
319         /* Read the requested video link pattern (Byte 0x221). */
320         rlen = drm_dp_dpcd_read(link->aux, addr, bp, len);
321         if (rlen < len) {
322                 DRM_ERROR("failed to read 0x%x\n", addr);
323                 return -EINVAL;
324         }
325
326         *val = bp[1] | (bp[0] << 8);
327
328         return 0;
329 }
330
331 static int dp_link_parse_timing_params2(struct dp_link_private *link,
332                                         int addr, int len,
333                                         u32 *val1, u32 *val2)
334 {
335         u8 bp[2];
336         int rlen;
337
338         if (len != 2)
339                 return -EINVAL;
340
341         /* Read the requested video link pattern (Byte 0x221). */
342         rlen = drm_dp_dpcd_read(link->aux, addr, bp, len);
343         if (rlen < len) {
344                 DRM_ERROR("failed to read 0x%x\n", addr);
345                 return -EINVAL;
346         }
347
348         *val1 = (bp[0] & BIT(7)) >> 7;
349         *val2 = bp[1] | ((bp[0] & 0x7F) << 8);
350
351         return 0;
352 }
353
354 static int dp_link_parse_timing_params3(struct dp_link_private *link,
355                                         int addr, u32 *val)
356 {
357         u8 bp;
358         u32 len = 1;
359         int rlen;
360
361         rlen = drm_dp_dpcd_read(link->aux, addr, &bp, len);
362         if (rlen < 1) {
363                 DRM_ERROR("failed to read 0x%x\n", addr);
364                 return -EINVAL;
365         }
366         *val = bp;
367
368         return 0;
369 }
370
371 /**
372  * dp_link_parse_video_pattern_params() - parses video pattern parameters from DPCD
373  * @link: Display Port Driver data
374  *
375  * Returns 0 if it successfully parses the video link pattern and the link
376  * bit depth requested by the sink and, and if the values parsed are valid.
377  */
378 static int dp_link_parse_video_pattern_params(struct dp_link_private *link)
379 {
380         int ret = 0;
381         ssize_t rlen;
382         u8 bp;
383
384         rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_PATTERN, &bp);
385         if (rlen < 0) {
386                 DRM_ERROR("failed to read link video pattern. rlen=%zd\n",
387                         rlen);
388                 return rlen;
389         }
390
391         if (!dp_link_is_video_pattern_valid(bp)) {
392                 DRM_ERROR("invalid link video pattern = 0x%x\n", bp);
393                 ret = -EINVAL;
394                 return ret;
395         }
396
397         link->dp_link.test_video.test_video_pattern = bp;
398
399         /* Read the requested color bit depth and dynamic range (Byte 0x232) */
400         rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_MISC0, &bp);
401         if (rlen < 0) {
402                 DRM_ERROR("failed to read link bit depth. rlen=%zd\n", rlen);
403                 return rlen;
404         }
405
406         /* Dynamic Range */
407         link->dp_link.test_video.test_dyn_range =
408                         (bp & DP_TEST_DYNAMIC_RANGE_CEA);
409
410         /* Color bit depth */
411         bp &= DP_TEST_BIT_DEPTH_MASK;
412         if (!dp_link_is_bit_depth_valid(bp)) {
413                 DRM_ERROR("invalid link bit depth = 0x%x\n", bp);
414                 ret = -EINVAL;
415                 return ret;
416         }
417
418         link->dp_link.test_video.test_bit_depth = bp;
419
420         /* resolution timing params */
421         ret = dp_link_parse_timing_params1(link, DP_TEST_H_TOTAL_HI, 2,
422                         &link->dp_link.test_video.test_h_total);
423         if (ret) {
424                 DRM_ERROR("failed to parse test_htotal(DP_TEST_H_TOTAL_HI)\n");
425                 return ret;
426         }
427
428         ret = dp_link_parse_timing_params1(link, DP_TEST_V_TOTAL_HI, 2,
429                         &link->dp_link.test_video.test_v_total);
430         if (ret) {
431                 DRM_ERROR("failed to parse test_v_total(DP_TEST_V_TOTAL_HI)\n");
432                 return ret;
433         }
434
435         ret = dp_link_parse_timing_params1(link, DP_TEST_H_START_HI, 2,
436                         &link->dp_link.test_video.test_h_start);
437         if (ret) {
438                 DRM_ERROR("failed to parse test_h_start(DP_TEST_H_START_HI)\n");
439                 return ret;
440         }
441
442         ret = dp_link_parse_timing_params1(link, DP_TEST_V_START_HI, 2,
443                         &link->dp_link.test_video.test_v_start);
444         if (ret) {
445                 DRM_ERROR("failed to parse test_v_start(DP_TEST_V_START_HI)\n");
446                 return ret;
447         }
448
449         ret = dp_link_parse_timing_params2(link, DP_TEST_HSYNC_HI, 2,
450                         &link->dp_link.test_video.test_hsync_pol,
451                         &link->dp_link.test_video.test_hsync_width);
452         if (ret) {
453                 DRM_ERROR("failed to parse (DP_TEST_HSYNC_HI)\n");
454                 return ret;
455         }
456
457         ret = dp_link_parse_timing_params2(link, DP_TEST_VSYNC_HI, 2,
458                         &link->dp_link.test_video.test_vsync_pol,
459                         &link->dp_link.test_video.test_vsync_width);
460         if (ret) {
461                 DRM_ERROR("failed to parse (DP_TEST_VSYNC_HI)\n");
462                 return ret;
463         }
464
465         ret = dp_link_parse_timing_params1(link, DP_TEST_H_WIDTH_HI, 2,
466                         &link->dp_link.test_video.test_h_width);
467         if (ret) {
468                 DRM_ERROR("failed to parse test_h_width(DP_TEST_H_WIDTH_HI)\n");
469                 return ret;
470         }
471
472         ret = dp_link_parse_timing_params1(link, DP_TEST_V_HEIGHT_HI, 2,
473                         &link->dp_link.test_video.test_v_height);
474         if (ret) {
475                 DRM_ERROR("failed to parse test_v_height\n");
476                 return ret;
477         }
478
479         ret = dp_link_parse_timing_params3(link, DP_TEST_MISC1,
480                 &link->dp_link.test_video.test_rr_d);
481         link->dp_link.test_video.test_rr_d &= DP_TEST_REFRESH_DENOMINATOR;
482         if (ret) {
483                 DRM_ERROR("failed to parse test_rr_d (DP_TEST_MISC1)\n");
484                 return ret;
485         }
486
487         ret = dp_link_parse_timing_params3(link, DP_TEST_REFRESH_RATE_NUMERATOR,
488                 &link->dp_link.test_video.test_rr_n);
489         if (ret) {
490                 DRM_ERROR("failed to parse test_rr_n\n");
491                 return ret;
492         }
493
494         drm_dbg_dp(link->drm_dev,
495                 "link video pattern = 0x%x\n"
496                 "link dynamic range = 0x%x\n"
497                 "link bit depth = 0x%x\n"
498                 "TEST_H_TOTAL = %d, TEST_V_TOTAL = %d\n"
499                 "TEST_H_START = %d, TEST_V_START = %d\n"
500                 "TEST_HSYNC_POL = %d\n"
501                 "TEST_HSYNC_WIDTH = %d\n"
502                 "TEST_VSYNC_POL = %d\n"
503                 "TEST_VSYNC_WIDTH = %d\n"
504                 "TEST_H_WIDTH = %d\n"
505                 "TEST_V_HEIGHT = %d\n"
506                 "TEST_REFRESH_DENOMINATOR = %d\n"
507                  "TEST_REFRESH_NUMERATOR = %d\n",
508                 link->dp_link.test_video.test_video_pattern,
509                 link->dp_link.test_video.test_dyn_range,
510                 link->dp_link.test_video.test_bit_depth,
511                 link->dp_link.test_video.test_h_total,
512                 link->dp_link.test_video.test_v_total,
513                 link->dp_link.test_video.test_h_start,
514                 link->dp_link.test_video.test_v_start,
515                 link->dp_link.test_video.test_hsync_pol,
516                 link->dp_link.test_video.test_hsync_width,
517                 link->dp_link.test_video.test_vsync_pol,
518                 link->dp_link.test_video.test_vsync_width,
519                 link->dp_link.test_video.test_h_width,
520                 link->dp_link.test_video.test_v_height,
521                 link->dp_link.test_video.test_rr_d,
522                 link->dp_link.test_video.test_rr_n);
523
524         return ret;
525 }
526
527 /**
528  * dp_link_parse_link_training_params() - parses link training parameters from
529  * DPCD
530  * @link: Display Port Driver data
531  *
532  * Returns 0 if it successfully parses the link rate (Byte 0x219) and lane
533  * count (Byte 0x220), and if these values parse are valid.
534  */
535 static int dp_link_parse_link_training_params(struct dp_link_private *link)
536 {
537         u8 bp;
538         ssize_t rlen;
539
540         rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_LINK_RATE,  &bp);
541         if (rlen < 0) {
542                 DRM_ERROR("failed to read link rate. rlen=%zd\n", rlen);
543                 return rlen;
544         }
545
546         if (!is_link_rate_valid(bp)) {
547                 DRM_ERROR("invalid link rate = 0x%x\n", bp);
548                 return -EINVAL;
549         }
550
551         link->request.test_link_rate = bp;
552         drm_dbg_dp(link->drm_dev, "link rate = 0x%x\n",
553                                 link->request.test_link_rate);
554
555         rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_LANE_COUNT, &bp);
556         if (rlen < 0) {
557                 DRM_ERROR("failed to read lane count. rlen=%zd\n", rlen);
558                 return rlen;
559         }
560         bp &= DP_MAX_LANE_COUNT_MASK;
561
562         if (!is_lane_count_valid(bp)) {
563                 DRM_ERROR("invalid lane count = 0x%x\n", bp);
564                 return -EINVAL;
565         }
566
567         link->request.test_lane_count = bp;
568         drm_dbg_dp(link->drm_dev, "lane count = 0x%x\n",
569                                 link->request.test_lane_count);
570         return 0;
571 }
572
573 /**
574  * dp_link_parse_phy_test_params() - parses the phy link parameters
575  * @link: Display Port Driver data
576  *
577  * Parses the DPCD (Byte 0x248) for the DP PHY link pattern that is being
578  * requested.
579  */
580 static int dp_link_parse_phy_test_params(struct dp_link_private *link)
581 {
582         u8 data;
583         ssize_t rlen;
584
585         rlen = drm_dp_dpcd_readb(link->aux, DP_PHY_TEST_PATTERN,
586                                         &data);
587         if (rlen < 0) {
588                 DRM_ERROR("failed to read phy link pattern. rlen=%zd\n", rlen);
589                 return rlen;
590         }
591
592         link->dp_link.phy_params.phy_test_pattern_sel = data & 0x07;
593
594         drm_dbg_dp(link->drm_dev, "phy_test_pattern_sel = 0x%x\n", data);
595
596         switch (data) {
597         case DP_PHY_TEST_PATTERN_SEL_MASK:
598         case DP_PHY_TEST_PATTERN_NONE:
599         case DP_PHY_TEST_PATTERN_D10_2:
600         case DP_PHY_TEST_PATTERN_ERROR_COUNT:
601         case DP_PHY_TEST_PATTERN_PRBS7:
602         case DP_PHY_TEST_PATTERN_80BIT_CUSTOM:
603         case DP_PHY_TEST_PATTERN_CP2520:
604                 return 0;
605         default:
606                 return -EINVAL;
607         }
608 }
609
610 /**
611  * dp_link_is_video_audio_test_requested() - checks for audio/video link request
612  * @link: link requested by the sink
613  *
614  * Returns true if the requested link is a permitted audio/video link.
615  */
616 static bool dp_link_is_video_audio_test_requested(u32 link)
617 {
618         u8 video_audio_test = (DP_TEST_LINK_VIDEO_PATTERN |
619                                 DP_TEST_LINK_AUDIO_PATTERN |
620                                 DP_TEST_LINK_AUDIO_DISABLED_VIDEO);
621
622         return ((link & video_audio_test) &&
623                 !(link & ~video_audio_test));
624 }
625
626 /**
627  * dp_link_parse_request() - parses link request parameters from sink
628  * @link: Display Port Driver data
629  *
630  * Parses the DPCD to check if an automated link is requested (Byte 0x201),
631  * and what type of link automation is being requested (Byte 0x218).
632  */
633 static int dp_link_parse_request(struct dp_link_private *link)
634 {
635         int ret = 0;
636         u8 data;
637         ssize_t rlen;
638
639         /**
640          * Read the device service IRQ vector (Byte 0x201) to determine
641          * whether an automated link has been requested by the sink.
642          */
643         rlen = drm_dp_dpcd_readb(link->aux,
644                                 DP_DEVICE_SERVICE_IRQ_VECTOR, &data);
645         if (rlen < 0) {
646                 DRM_ERROR("aux read failed. rlen=%zd\n", rlen);
647                 return rlen;
648         }
649
650         drm_dbg_dp(link->drm_dev, "device service irq vector = 0x%x\n", data);
651
652         if (!(data & DP_AUTOMATED_TEST_REQUEST)) {
653                 drm_dbg_dp(link->drm_dev, "no test requested\n");
654                 return 0;
655         }
656
657         /**
658          * Read the link request byte (Byte 0x218) to determine what type
659          * of automated link has been requested by the sink.
660          */
661         rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_REQUEST, &data);
662         if (rlen < 0) {
663                 DRM_ERROR("aux read failed. rlen=%zd\n", rlen);
664                 return rlen;
665         }
666
667         if (!data || (data == DP_TEST_LINK_FAUX_PATTERN)) {
668                 drm_dbg_dp(link->drm_dev, "link 0x%x not supported\n", data);
669                 goto end;
670         }
671
672         drm_dbg_dp(link->drm_dev, "Test:(0x%x) requested\n", data);
673         link->request.test_requested = data;
674         if (link->request.test_requested == DP_TEST_LINK_PHY_TEST_PATTERN) {
675                 ret = dp_link_parse_phy_test_params(link);
676                 if (ret)
677                         goto end;
678                 ret = dp_link_parse_link_training_params(link);
679                 if (ret)
680                         goto end;
681         }
682
683         if (link->request.test_requested == DP_TEST_LINK_TRAINING) {
684                 ret = dp_link_parse_link_training_params(link);
685                 if (ret)
686                         goto end;
687         }
688
689         if (dp_link_is_video_audio_test_requested(
690                         link->request.test_requested)) {
691                 ret = dp_link_parse_video_pattern_params(link);
692                 if (ret)
693                         goto end;
694
695                 ret = dp_link_parse_audio_pattern_params(link);
696         }
697 end:
698         /*
699          * Send a DP_TEST_ACK if all link parameters are valid, otherwise send
700          * a DP_TEST_NAK.
701          */
702         if (ret) {
703                 link->dp_link.test_response = DP_TEST_NAK;
704         } else {
705                 if (link->request.test_requested != DP_TEST_LINK_EDID_READ)
706                         link->dp_link.test_response = DP_TEST_ACK;
707                 else
708                         link->dp_link.test_response =
709                                 DP_TEST_EDID_CHECKSUM_WRITE;
710         }
711
712         return ret;
713 }
714
715 static int dp_link_parse_sink_status_field(struct dp_link_private *link)
716 {
717         int len;
718
719         link->prev_sink_count = link->dp_link.sink_count;
720         len = drm_dp_read_sink_count(link->aux);
721         if (len < 0) {
722                 DRM_ERROR("DP parse sink count failed\n");
723                 return len;
724         }
725         link->dp_link.sink_count = len;
726
727         len = drm_dp_dpcd_read_link_status(link->aux,
728                 link->link_status);
729         if (len < DP_LINK_STATUS_SIZE) {
730                 DRM_ERROR("DP link status read failed\n");
731                 return len;
732         }
733
734         return dp_link_parse_request(link);
735 }
736
737 /**
738  * dp_link_process_link_training_request() - processes new training requests
739  * @link: Display Port link data
740  *
741  * This function will handle new link training requests that are initiated by
742  * the sink. In particular, it will update the requested lane count and link
743  * rate, and then trigger the link retraining procedure.
744  *
745  * The function will return 0 if a link training request has been processed,
746  * otherwise it will return -EINVAL.
747  */
748 static int dp_link_process_link_training_request(struct dp_link_private *link)
749 {
750         if (link->request.test_requested != DP_TEST_LINK_TRAINING)
751                 return -EINVAL;
752
753         drm_dbg_dp(link->drm_dev,
754                         "Test:0x%x link rate = 0x%x, lane count = 0x%x\n",
755                         DP_TEST_LINK_TRAINING,
756                         link->request.test_link_rate,
757                         link->request.test_lane_count);
758
759         link->dp_link.link_params.num_lanes = link->request.test_lane_count;
760         link->dp_link.link_params.rate =
761                 drm_dp_bw_code_to_link_rate(link->request.test_link_rate);
762
763         return 0;
764 }
765
766 bool dp_link_send_test_response(struct dp_link *dp_link)
767 {
768         struct dp_link_private *link = NULL;
769         int ret = 0;
770
771         if (!dp_link) {
772                 DRM_ERROR("invalid input\n");
773                 return false;
774         }
775
776         link = container_of(dp_link, struct dp_link_private, dp_link);
777
778         ret = drm_dp_dpcd_writeb(link->aux, DP_TEST_RESPONSE,
779                         dp_link->test_response);
780
781         return ret == 1;
782 }
783
784 int dp_link_psm_config(struct dp_link *dp_link,
785                               struct dp_link_info *link_info, bool enable)
786 {
787         struct dp_link_private *link = NULL;
788         int ret = 0;
789
790         if (!dp_link) {
791                 DRM_ERROR("invalid params\n");
792                 return -EINVAL;
793         }
794
795         link = container_of(dp_link, struct dp_link_private, dp_link);
796
797         mutex_lock(&link->psm_mutex);
798         if (enable)
799                 ret = dp_aux_link_power_down(link->aux, link_info);
800         else
801                 ret = dp_aux_link_power_up(link->aux, link_info);
802
803         if (ret)
804                 DRM_ERROR("Failed to %s low power mode\n", enable ?
805                                                         "enter" : "exit");
806         else
807                 dp_link->psm_enabled = enable;
808
809         mutex_unlock(&link->psm_mutex);
810         return ret;
811 }
812
813 bool dp_link_send_edid_checksum(struct dp_link *dp_link, u8 checksum)
814 {
815         struct dp_link_private *link = NULL;
816         int ret = 0;
817
818         if (!dp_link) {
819                 DRM_ERROR("invalid input\n");
820                 return false;
821         }
822
823         link = container_of(dp_link, struct dp_link_private, dp_link);
824
825         ret = drm_dp_dpcd_writeb(link->aux, DP_TEST_EDID_CHECKSUM,
826                                                 checksum);
827         return ret == 1;
828 }
829
830 static void dp_link_parse_vx_px(struct dp_link_private *link)
831 {
832         drm_dbg_dp(link->drm_dev, "vx: 0=%d, 1=%d, 2=%d, 3=%d\n",
833                 drm_dp_get_adjust_request_voltage(link->link_status, 0),
834                 drm_dp_get_adjust_request_voltage(link->link_status, 1),
835                 drm_dp_get_adjust_request_voltage(link->link_status, 2),
836                 drm_dp_get_adjust_request_voltage(link->link_status, 3));
837
838         drm_dbg_dp(link->drm_dev, "px: 0=%d, 1=%d, 2=%d, 3=%d\n",
839                 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 0),
840                 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 1),
841                 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 2),
842                 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 3));
843
844         /**
845          * Update the voltage and pre-emphasis levels as per DPCD request
846          * vector.
847          */
848         drm_dbg_dp(link->drm_dev,
849                          "Current: v_level = 0x%x, p_level = 0x%x\n",
850                         link->dp_link.phy_params.v_level,
851                         link->dp_link.phy_params.p_level);
852         link->dp_link.phy_params.v_level =
853                 drm_dp_get_adjust_request_voltage(link->link_status, 0);
854         link->dp_link.phy_params.p_level =
855                 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 0);
856
857         link->dp_link.phy_params.p_level >>= DP_TRAIN_PRE_EMPHASIS_SHIFT;
858
859         drm_dbg_dp(link->drm_dev,
860                         "Requested: v_level = 0x%x, p_level = 0x%x\n",
861                         link->dp_link.phy_params.v_level,
862                         link->dp_link.phy_params.p_level);
863 }
864
865 /**
866  * dp_link_process_phy_test_pattern_request() - process new phy link requests
867  * @link: Display Port Driver data
868  *
869  * This function will handle new phy link pattern requests that are initiated
870  * by the sink. The function will return 0 if a phy link pattern has been
871  * processed, otherwise it will return -EINVAL.
872  */
873 static int dp_link_process_phy_test_pattern_request(
874                 struct dp_link_private *link)
875 {
876         if (!(link->request.test_requested & DP_TEST_LINK_PHY_TEST_PATTERN)) {
877                 drm_dbg_dp(link->drm_dev, "no phy test\n");
878                 return -EINVAL;
879         }
880
881         if (!is_link_rate_valid(link->request.test_link_rate) ||
882                 !is_lane_count_valid(link->request.test_lane_count)) {
883                 DRM_ERROR("Invalid: link rate = 0x%x,lane count = 0x%x\n",
884                                 link->request.test_link_rate,
885                                 link->request.test_lane_count);
886                 return -EINVAL;
887         }
888
889         drm_dbg_dp(link->drm_dev,
890                         "Current: rate = 0x%x, lane count = 0x%x\n",
891                         link->dp_link.link_params.rate,
892                         link->dp_link.link_params.num_lanes);
893
894         drm_dbg_dp(link->drm_dev,
895                         "Requested: rate = 0x%x, lane count = 0x%x\n",
896                         link->request.test_link_rate,
897                         link->request.test_lane_count);
898
899         link->dp_link.link_params.num_lanes = link->request.test_lane_count;
900         link->dp_link.link_params.rate =
901                 drm_dp_bw_code_to_link_rate(link->request.test_link_rate);
902
903         dp_link_parse_vx_px(link);
904
905         return 0;
906 }
907
908 static bool dp_link_read_psr_error_status(struct dp_link_private *link)
909 {
910         u8 status;
911
912         drm_dp_dpcd_read(link->aux, DP_PSR_ERROR_STATUS, &status, 1);
913
914         if (status & DP_PSR_LINK_CRC_ERROR)
915                 DRM_ERROR("PSR LINK CRC ERROR\n");
916         else if (status & DP_PSR_RFB_STORAGE_ERROR)
917                 DRM_ERROR("PSR RFB STORAGE ERROR\n");
918         else if (status & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
919                 DRM_ERROR("PSR VSC SDP UNCORRECTABLE ERROR\n");
920         else
921                 return false;
922
923         return true;
924 }
925
926 static bool dp_link_psr_capability_changed(struct dp_link_private *link)
927 {
928         u8 status;
929
930         drm_dp_dpcd_read(link->aux, DP_PSR_ESI, &status, 1);
931
932         if (status & DP_PSR_CAPS_CHANGE) {
933                 drm_dbg_dp(link->drm_dev, "PSR Capability Change\n");
934                 return true;
935         }
936
937         return false;
938 }
939
940 static u8 get_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
941 {
942         return link_status[r - DP_LANE0_1_STATUS];
943 }
944
945 /**
946  * dp_link_process_link_status_update() - processes link status updates
947  * @link: Display Port link module data
948  *
949  * This function will check for changes in the link status, e.g. clock
950  * recovery done on all lanes, and trigger link training if there is a
951  * failure/error on the link.
952  *
953  * The function will return 0 if the a link status update has been processed,
954  * otherwise it will return -EINVAL.
955  */
956 static int dp_link_process_link_status_update(struct dp_link_private *link)
957 {
958         bool channel_eq_done = drm_dp_channel_eq_ok(link->link_status,
959                         link->dp_link.link_params.num_lanes);
960
961         bool clock_recovery_done = drm_dp_clock_recovery_ok(link->link_status,
962                         link->dp_link.link_params.num_lanes);
963
964         drm_dbg_dp(link->drm_dev,
965                        "channel_eq_done = %d, clock_recovery_done = %d\n",
966                         channel_eq_done, clock_recovery_done);
967
968         if (channel_eq_done && clock_recovery_done)
969                 return -EINVAL;
970
971         return 0;
972 }
973
974 /**
975  * dp_link_process_ds_port_status_change() - process port status changes
976  * @link: Display Port Driver data
977  *
978  * This function will handle downstream port updates that are initiated by
979  * the sink. If the downstream port status has changed, the EDID is read via
980  * AUX.
981  *
982  * The function will return 0 if a downstream port update has been
983  * processed, otherwise it will return -EINVAL.
984  */
985 static int dp_link_process_ds_port_status_change(struct dp_link_private *link)
986 {
987         if (get_link_status(link->link_status, DP_LANE_ALIGN_STATUS_UPDATED) &
988                                         DP_DOWNSTREAM_PORT_STATUS_CHANGED)
989                 goto reset;
990
991         if (link->prev_sink_count == link->dp_link.sink_count)
992                 return -EINVAL;
993
994 reset:
995         /* reset prev_sink_count */
996         link->prev_sink_count = link->dp_link.sink_count;
997
998         return 0;
999 }
1000
1001 static bool dp_link_is_video_pattern_requested(struct dp_link_private *link)
1002 {
1003         return (link->request.test_requested & DP_TEST_LINK_VIDEO_PATTERN)
1004                 && !(link->request.test_requested &
1005                 DP_TEST_LINK_AUDIO_DISABLED_VIDEO);
1006 }
1007
1008 static bool dp_link_is_audio_pattern_requested(struct dp_link_private *link)
1009 {
1010         return (link->request.test_requested & DP_TEST_LINK_AUDIO_PATTERN);
1011 }
1012
1013 static void dp_link_reset_data(struct dp_link_private *link)
1014 {
1015         link->request = (const struct dp_link_request){ 0 };
1016         link->dp_link.test_video = (const struct dp_link_test_video){ 0 };
1017         link->dp_link.test_video.test_bit_depth = DP_TEST_BIT_DEPTH_UNKNOWN;
1018         link->dp_link.test_audio = (const struct dp_link_test_audio){ 0 };
1019         link->dp_link.phy_params.phy_test_pattern_sel = 0;
1020         link->dp_link.sink_request = 0;
1021         link->dp_link.test_response = 0;
1022 }
1023
1024 /**
1025  * dp_link_process_request() - handle HPD IRQ transition to HIGH
1026  * @dp_link: pointer to link module data
1027  *
1028  * This function will handle the HPD IRQ state transitions from LOW to HIGH
1029  * (including cases when there are back to back HPD IRQ HIGH) indicating
1030  * the start of a new link training request or sink status update.
1031  */
1032 int dp_link_process_request(struct dp_link *dp_link)
1033 {
1034         int ret = 0;
1035         struct dp_link_private *link;
1036
1037         if (!dp_link) {
1038                 DRM_ERROR("invalid input\n");
1039                 return -EINVAL;
1040         }
1041
1042         link = container_of(dp_link, struct dp_link_private, dp_link);
1043
1044         dp_link_reset_data(link);
1045
1046         ret = dp_link_parse_sink_status_field(link);
1047         if (ret)
1048                 return ret;
1049
1050         if (link->request.test_requested == DP_TEST_LINK_EDID_READ) {
1051                 dp_link->sink_request |= DP_TEST_LINK_EDID_READ;
1052         } else if (!dp_link_process_ds_port_status_change(link)) {
1053                 dp_link->sink_request |= DS_PORT_STATUS_CHANGED;
1054         } else if (!dp_link_process_link_training_request(link)) {
1055                 dp_link->sink_request |= DP_TEST_LINK_TRAINING;
1056         } else if (!dp_link_process_phy_test_pattern_request(link)) {
1057                 dp_link->sink_request |= DP_TEST_LINK_PHY_TEST_PATTERN;
1058         } else if (dp_link_read_psr_error_status(link)) {
1059                 DRM_ERROR("PSR IRQ_HPD received\n");
1060         } else if (dp_link_psr_capability_changed(link)) {
1061                 drm_dbg_dp(link->drm_dev, "PSR Capability changed\n");
1062         } else {
1063                 ret = dp_link_process_link_status_update(link);
1064                 if (!ret) {
1065                         dp_link->sink_request |= DP_LINK_STATUS_UPDATED;
1066                 } else {
1067                         if (dp_link_is_video_pattern_requested(link)) {
1068                                 ret = 0;
1069                                 dp_link->sink_request |= DP_TEST_LINK_VIDEO_PATTERN;
1070                         }
1071                         if (dp_link_is_audio_pattern_requested(link)) {
1072                                 dp_link->sink_request |= DP_TEST_LINK_AUDIO_PATTERN;
1073                                 ret = -EINVAL;
1074                         }
1075                 }
1076         }
1077
1078         drm_dbg_dp(link->drm_dev, "sink request=%#x\n",
1079                                 dp_link->sink_request);
1080         return ret;
1081 }
1082
1083 int dp_link_get_colorimetry_config(struct dp_link *dp_link)
1084 {
1085         u32 cc;
1086         struct dp_link_private *link;
1087
1088         if (!dp_link) {
1089                 DRM_ERROR("invalid input\n");
1090                 return -EINVAL;
1091         }
1092
1093         link = container_of(dp_link, struct dp_link_private, dp_link);
1094
1095         /*
1096          * Unless a video pattern CTS test is ongoing, use RGB_VESA
1097          * Only RGB_VESA and RGB_CEA supported for now
1098          */
1099         if (dp_link_is_video_pattern_requested(link))
1100                 cc = link->dp_link.test_video.test_dyn_range;
1101         else
1102                 cc = DP_TEST_DYNAMIC_RANGE_VESA;
1103
1104         return cc;
1105 }
1106
1107 int dp_link_adjust_levels(struct dp_link *dp_link, u8 *link_status)
1108 {
1109         int i;
1110         int v_max = 0, p_max = 0;
1111         struct dp_link_private *link;
1112
1113         if (!dp_link) {
1114                 DRM_ERROR("invalid input\n");
1115                 return -EINVAL;
1116         }
1117
1118         link = container_of(dp_link, struct dp_link_private, dp_link);
1119
1120         /* use the max level across lanes */
1121         for (i = 0; i < dp_link->link_params.num_lanes; i++) {
1122                 u8 data_v = drm_dp_get_adjust_request_voltage(link_status, i);
1123                 u8 data_p = drm_dp_get_adjust_request_pre_emphasis(link_status,
1124                                                                          i);
1125                 drm_dbg_dp(link->drm_dev,
1126                                 "lane=%d req_vol_swing=%d req_pre_emphasis=%d\n",
1127                                 i, data_v, data_p);
1128                 if (v_max < data_v)
1129                         v_max = data_v;
1130                 if (p_max < data_p)
1131                         p_max = data_p;
1132         }
1133
1134         dp_link->phy_params.v_level = v_max >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
1135         dp_link->phy_params.p_level = p_max >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
1136
1137         /**
1138          * Adjust the voltage swing and pre-emphasis level combination to within
1139          * the allowable range.
1140          */
1141         if (dp_link->phy_params.v_level > DP_TRAIN_VOLTAGE_SWING_MAX) {
1142                 drm_dbg_dp(link->drm_dev,
1143                         "Requested vSwingLevel=%d, change to %d\n",
1144                         dp_link->phy_params.v_level,
1145                         DP_TRAIN_VOLTAGE_SWING_MAX);
1146                 dp_link->phy_params.v_level = DP_TRAIN_VOLTAGE_SWING_MAX;
1147         }
1148
1149         if (dp_link->phy_params.p_level > DP_TRAIN_PRE_EMPHASIS_MAX) {
1150                 drm_dbg_dp(link->drm_dev,
1151                         "Requested preEmphasisLevel=%d, change to %d\n",
1152                         dp_link->phy_params.p_level,
1153                         DP_TRAIN_PRE_EMPHASIS_MAX);
1154                 dp_link->phy_params.p_level = DP_TRAIN_PRE_EMPHASIS_MAX;
1155         }
1156
1157         if ((dp_link->phy_params.p_level > DP_TRAIN_PRE_EMPHASIS_LVL_1)
1158                 && (dp_link->phy_params.v_level ==
1159                         DP_TRAIN_VOLTAGE_SWING_LVL_2)) {
1160                 drm_dbg_dp(link->drm_dev,
1161                         "Requested preEmphasisLevel=%d, change to %d\n",
1162                         dp_link->phy_params.p_level,
1163                         DP_TRAIN_PRE_EMPHASIS_LVL_1);
1164                 dp_link->phy_params.p_level = DP_TRAIN_PRE_EMPHASIS_LVL_1;
1165         }
1166
1167         drm_dbg_dp(link->drm_dev, "adjusted: v_level=%d, p_level=%d\n",
1168                 dp_link->phy_params.v_level, dp_link->phy_params.p_level);
1169
1170         return 0;
1171 }
1172
1173 void dp_link_reset_phy_params_vx_px(struct dp_link *dp_link)
1174 {
1175         dp_link->phy_params.v_level = 0;
1176         dp_link->phy_params.p_level = 0;
1177 }
1178
1179 u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp)
1180 {
1181         u32 tbd;
1182
1183         /*
1184          * Few simplistic rules and assumptions made here:
1185          *    1. Test bit depth is bit depth per color component
1186          *    2. Assume 3 color components
1187          */
1188         switch (bpp) {
1189         case 18:
1190                 tbd = DP_TEST_BIT_DEPTH_6;
1191                 break;
1192         case 24:
1193                 tbd = DP_TEST_BIT_DEPTH_8;
1194                 break;
1195         case 30:
1196                 tbd = DP_TEST_BIT_DEPTH_10;
1197                 break;
1198         default:
1199                 tbd = DP_TEST_BIT_DEPTH_UNKNOWN;
1200                 break;
1201         }
1202
1203         if (tbd != DP_TEST_BIT_DEPTH_UNKNOWN)
1204                 tbd = (tbd >> DP_TEST_BIT_DEPTH_SHIFT);
1205
1206         return tbd;
1207 }
1208
1209 struct dp_link *dp_link_get(struct device *dev, struct drm_dp_aux *aux)
1210 {
1211         struct dp_link_private *link;
1212         struct dp_link *dp_link;
1213
1214         if (!dev || !aux) {
1215                 DRM_ERROR("invalid input\n");
1216                 return ERR_PTR(-EINVAL);
1217         }
1218
1219         link = devm_kzalloc(dev, sizeof(*link), GFP_KERNEL);
1220         if (!link)
1221                 return ERR_PTR(-ENOMEM);
1222
1223         link->dev   = dev;
1224         link->aux   = aux;
1225
1226         mutex_init(&link->psm_mutex);
1227         dp_link = &link->dp_link;
1228
1229         return dp_link;
1230 }
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