1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
6 #define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
8 #include <drm/drm_print.h>
13 #define DP_TEST_REQUEST_MASK 0x7F
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,
25 enum audio_pattern_type {
26 AUDIO_TEST_PATTERN_OPERATOR_DEFINED = 0x00,
27 AUDIO_TEST_PATTERN_SAWTOOTH = 0x01,
30 struct dp_link_request {
36 struct dp_link_private {
39 struct drm_device *drm_dev;
40 struct drm_dp_aux *aux;
41 struct dp_link dp_link;
43 struct dp_link_request request;
44 struct mutex psm_mutex;
45 u8 link_status[DP_LINK_STATUS_SIZE];
48 static int dp_aux_link_power_up(struct drm_dp_aux *aux,
49 struct dp_link_info *link)
55 if (link->revision < 0x11)
58 len = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
62 value &= ~DP_SET_POWER_MASK;
63 value |= DP_SET_POWER_D0;
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);
76 static int dp_aux_link_power_down(struct drm_dp_aux *aux,
77 struct dp_link_info *link)
82 if (link->revision < 0x11)
85 err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
89 value &= ~DP_SET_POWER_MASK;
90 value |= DP_SET_POWER_D3;
92 err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
99 static int dp_link_get_period(struct dp_link_private *link, int const addr)
103 u32 const max_audio_period = 0xA;
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);
112 /* Period - Bits 3:0 */
114 if ((int)data > max_audio_period) {
115 DRM_ERROR("invalid test_audio_period_ch_1 = 0x%x\n", data);
125 static int dp_link_parse_audio_channel_period(struct dp_link_private *link)
128 struct dp_link_test_audio *req = &link->dp_link.test_audio;
130 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH1);
134 req->test_audio_period_ch_1 = ret;
135 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_1 = 0x%x\n", ret);
137 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH2);
141 req->test_audio_period_ch_2 = ret;
142 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_2 = 0x%x\n", ret);
144 /* TEST_AUDIO_PERIOD_CH_3 (Byte 0x275) */
145 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH3);
149 req->test_audio_period_ch_3 = ret;
150 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_3 = 0x%x\n", ret);
152 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH4);
156 req->test_audio_period_ch_4 = ret;
157 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_4 = 0x%x\n", ret);
159 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH5);
163 req->test_audio_period_ch_5 = ret;
164 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_5 = 0x%x\n", ret);
166 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH6);
170 req->test_audio_period_ch_6 = ret;
171 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_6 = 0x%x\n", ret);
173 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH7);
177 req->test_audio_period_ch_7 = ret;
178 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_7 = 0x%x\n", ret);
180 ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH8);
184 req->test_audio_period_ch_8 = ret;
185 drm_dbg_dp(link->drm_dev, "test_audio_period_ch_8 = 0x%x\n", ret);
190 static int dp_link_parse_audio_pattern_type(struct dp_link_private *link)
195 int const max_audio_pattern_type = 0x1;
197 rlen = drm_dp_dpcd_readb(link->aux,
198 DP_TEST_AUDIO_PATTERN_TYPE, &data);
200 DRM_ERROR("failed to read link audio mode. rlen=%zd\n", rlen);
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);
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);
217 static int dp_link_parse_audio_mode(struct dp_link_private *link)
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;
227 rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_AUDIO_MODE, &data);
229 DRM_ERROR("failed to read link audio mode. rlen=%zd\n", rlen);
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);
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);
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);
260 static int dp_link_parse_audio_pattern_params(struct dp_link_private *link)
264 ret = dp_link_parse_audio_mode(link);
268 ret = dp_link_parse_audio_pattern_type(link);
272 ret = dp_link_parse_audio_channel_period(link);
278 static bool dp_link_is_video_pattern_valid(u32 pattern)
281 case DP_NO_TEST_PATTERN:
283 case DP_BLACK_AND_WHITE_VERTICAL_LINES:
284 case DP_COLOR_SQUARE:
292 * dp_link_is_bit_depth_valid() - validates the bit depth requested
293 * @tbd: bit depth requested by the sink
295 * Returns true if the requested bit depth is supported.
297 static bool dp_link_is_bit_depth_valid(u32 tbd)
299 /* DP_TEST_VIDEO_PATTERN_NONE is treated as invalid */
301 case DP_TEST_BIT_DEPTH_6:
302 case DP_TEST_BIT_DEPTH_8:
303 case DP_TEST_BIT_DEPTH_10:
310 static int dp_link_parse_timing_params1(struct dp_link_private *link,
311 int addr, int len, u32 *val)
319 /* Read the requested video link pattern (Byte 0x221). */
320 rlen = drm_dp_dpcd_read(link->aux, addr, bp, len);
322 DRM_ERROR("failed to read 0x%x\n", addr);
326 *val = bp[1] | (bp[0] << 8);
331 static int dp_link_parse_timing_params2(struct dp_link_private *link,
333 u32 *val1, u32 *val2)
341 /* Read the requested video link pattern (Byte 0x221). */
342 rlen = drm_dp_dpcd_read(link->aux, addr, bp, len);
344 DRM_ERROR("failed to read 0x%x\n", addr);
348 *val1 = (bp[0] & BIT(7)) >> 7;
349 *val2 = bp[1] | ((bp[0] & 0x7F) << 8);
354 static int dp_link_parse_timing_params3(struct dp_link_private *link,
361 rlen = drm_dp_dpcd_read(link->aux, addr, &bp, len);
363 DRM_ERROR("failed to read 0x%x\n", addr);
372 * dp_link_parse_video_pattern_params() - parses video pattern parameters from DPCD
373 * @link: Display Port Driver data
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.
378 static int dp_link_parse_video_pattern_params(struct dp_link_private *link)
384 rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_PATTERN, &bp);
386 DRM_ERROR("failed to read link video pattern. rlen=%zd\n",
391 if (!dp_link_is_video_pattern_valid(bp)) {
392 DRM_ERROR("invalid link video pattern = 0x%x\n", bp);
397 link->dp_link.test_video.test_video_pattern = bp;
399 /* Read the requested color bit depth and dynamic range (Byte 0x232) */
400 rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_MISC0, &bp);
402 DRM_ERROR("failed to read link bit depth. rlen=%zd\n", rlen);
407 link->dp_link.test_video.test_dyn_range =
408 (bp & DP_TEST_DYNAMIC_RANGE_CEA);
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);
418 link->dp_link.test_video.test_bit_depth = bp;
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);
424 DRM_ERROR("failed to parse test_htotal(DP_TEST_H_TOTAL_HI)\n");
428 ret = dp_link_parse_timing_params1(link, DP_TEST_V_TOTAL_HI, 2,
429 &link->dp_link.test_video.test_v_total);
431 DRM_ERROR("failed to parse test_v_total(DP_TEST_V_TOTAL_HI)\n");
435 ret = dp_link_parse_timing_params1(link, DP_TEST_H_START_HI, 2,
436 &link->dp_link.test_video.test_h_start);
438 DRM_ERROR("failed to parse test_h_start(DP_TEST_H_START_HI)\n");
442 ret = dp_link_parse_timing_params1(link, DP_TEST_V_START_HI, 2,
443 &link->dp_link.test_video.test_v_start);
445 DRM_ERROR("failed to parse test_v_start(DP_TEST_V_START_HI)\n");
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);
453 DRM_ERROR("failed to parse (DP_TEST_HSYNC_HI)\n");
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);
461 DRM_ERROR("failed to parse (DP_TEST_VSYNC_HI)\n");
465 ret = dp_link_parse_timing_params1(link, DP_TEST_H_WIDTH_HI, 2,
466 &link->dp_link.test_video.test_h_width);
468 DRM_ERROR("failed to parse test_h_width(DP_TEST_H_WIDTH_HI)\n");
472 ret = dp_link_parse_timing_params1(link, DP_TEST_V_HEIGHT_HI, 2,
473 &link->dp_link.test_video.test_v_height);
475 DRM_ERROR("failed to parse test_v_height\n");
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;
483 DRM_ERROR("failed to parse test_rr_d (DP_TEST_MISC1)\n");
487 ret = dp_link_parse_timing_params3(link, DP_TEST_REFRESH_RATE_NUMERATOR,
488 &link->dp_link.test_video.test_rr_n);
490 DRM_ERROR("failed to parse test_rr_n\n");
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);
528 * dp_link_parse_link_training_params() - parses link training parameters from
530 * @link: Display Port Driver data
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.
535 static int dp_link_parse_link_training_params(struct dp_link_private *link)
540 rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_LINK_RATE, &bp);
542 DRM_ERROR("failed to read link rate. rlen=%zd\n", rlen);
546 if (!is_link_rate_valid(bp)) {
547 DRM_ERROR("invalid link rate = 0x%x\n", bp);
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);
555 rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_LANE_COUNT, &bp);
557 DRM_ERROR("failed to read lane count. rlen=%zd\n", rlen);
560 bp &= DP_MAX_LANE_COUNT_MASK;
562 if (!is_lane_count_valid(bp)) {
563 DRM_ERROR("invalid lane count = 0x%x\n", bp);
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);
574 * dp_link_parse_phy_test_params() - parses the phy link parameters
575 * @link: Display Port Driver data
577 * Parses the DPCD (Byte 0x248) for the DP PHY link pattern that is being
580 static int dp_link_parse_phy_test_params(struct dp_link_private *link)
585 rlen = drm_dp_dpcd_readb(link->aux, DP_PHY_TEST_PATTERN,
588 DRM_ERROR("failed to read phy link pattern. rlen=%zd\n", rlen);
592 link->dp_link.phy_params.phy_test_pattern_sel = data & 0x07;
594 drm_dbg_dp(link->drm_dev, "phy_test_pattern_sel = 0x%x\n", 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:
611 * dp_link_is_video_audio_test_requested() - checks for audio/video link request
612 * @link: link requested by the sink
614 * Returns true if the requested link is a permitted audio/video link.
616 static bool dp_link_is_video_audio_test_requested(u32 link)
618 u8 video_audio_test = (DP_TEST_LINK_VIDEO_PATTERN |
619 DP_TEST_LINK_AUDIO_PATTERN |
620 DP_TEST_LINK_AUDIO_DISABLED_VIDEO);
622 return ((link & video_audio_test) &&
623 !(link & ~video_audio_test));
627 * dp_link_parse_request() - parses link request parameters from sink
628 * @link: Display Port Driver data
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).
633 static int dp_link_parse_request(struct dp_link_private *link)
640 * Read the device service IRQ vector (Byte 0x201) to determine
641 * whether an automated link has been requested by the sink.
643 rlen = drm_dp_dpcd_readb(link->aux,
644 DP_DEVICE_SERVICE_IRQ_VECTOR, &data);
646 DRM_ERROR("aux read failed. rlen=%zd\n", rlen);
650 drm_dbg_dp(link->drm_dev, "device service irq vector = 0x%x\n", data);
652 if (!(data & DP_AUTOMATED_TEST_REQUEST)) {
653 drm_dbg_dp(link->drm_dev, "no test requested\n");
658 * Read the link request byte (Byte 0x218) to determine what type
659 * of automated link has been requested by the sink.
661 rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_REQUEST, &data);
663 DRM_ERROR("aux read failed. rlen=%zd\n", rlen);
667 if (!data || (data == DP_TEST_LINK_FAUX_PATTERN)) {
668 drm_dbg_dp(link->drm_dev, "link 0x%x not supported\n", data);
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);
678 ret = dp_link_parse_link_training_params(link);
683 if (link->request.test_requested == DP_TEST_LINK_TRAINING) {
684 ret = dp_link_parse_link_training_params(link);
689 if (dp_link_is_video_audio_test_requested(
690 link->request.test_requested)) {
691 ret = dp_link_parse_video_pattern_params(link);
695 ret = dp_link_parse_audio_pattern_params(link);
699 * Send a DP_TEST_ACK if all link parameters are valid, otherwise send
703 link->dp_link.test_response = DP_TEST_NAK;
705 if (link->request.test_requested != DP_TEST_LINK_EDID_READ)
706 link->dp_link.test_response = DP_TEST_ACK;
708 link->dp_link.test_response =
709 DP_TEST_EDID_CHECKSUM_WRITE;
716 * dp_link_parse_sink_count() - parses the sink count
717 * @dp_link: pointer to link module data
719 * Parses the DPCD to check if there is an update to the sink count
720 * (Byte 0x200), and whether all the sink devices connected have Content
721 * Protection enabled.
723 static int dp_link_parse_sink_count(struct dp_link *dp_link)
728 struct dp_link_private *link = container_of(dp_link,
729 struct dp_link_private, dp_link);
731 rlen = drm_dp_dpcd_readb(link->aux, DP_SINK_COUNT,
732 &link->dp_link.sink_count);
734 DRM_ERROR("sink count read failed. rlen=%zd\n", rlen);
738 cp_ready = link->dp_link.sink_count & DP_SINK_CP_READY;
740 link->dp_link.sink_count =
741 DP_GET_SINK_COUNT(link->dp_link.sink_count);
743 drm_dbg_dp(link->drm_dev, "sink_count = 0x%x, cp_ready = 0x%x\n",
744 link->dp_link.sink_count, cp_ready);
748 static int dp_link_parse_sink_status_field(struct dp_link_private *link)
752 link->prev_sink_count = link->dp_link.sink_count;
753 len = dp_link_parse_sink_count(&link->dp_link);
755 DRM_ERROR("DP parse sink count failed\n");
759 len = drm_dp_dpcd_read_link_status(link->aux,
761 if (len < DP_LINK_STATUS_SIZE) {
762 DRM_ERROR("DP link status read failed\n");
766 return dp_link_parse_request(link);
770 * dp_link_process_link_training_request() - processes new training requests
771 * @link: Display Port link data
773 * This function will handle new link training requests that are initiated by
774 * the sink. In particular, it will update the requested lane count and link
775 * rate, and then trigger the link retraining procedure.
777 * The function will return 0 if a link training request has been processed,
778 * otherwise it will return -EINVAL.
780 static int dp_link_process_link_training_request(struct dp_link_private *link)
782 if (link->request.test_requested != DP_TEST_LINK_TRAINING)
785 drm_dbg_dp(link->drm_dev,
786 "Test:0x%x link rate = 0x%x, lane count = 0x%x\n",
787 DP_TEST_LINK_TRAINING,
788 link->request.test_link_rate,
789 link->request.test_lane_count);
791 link->dp_link.link_params.num_lanes = link->request.test_lane_count;
792 link->dp_link.link_params.rate =
793 drm_dp_bw_code_to_link_rate(link->request.test_link_rate);
798 bool dp_link_send_test_response(struct dp_link *dp_link)
800 struct dp_link_private *link = NULL;
804 DRM_ERROR("invalid input\n");
808 link = container_of(dp_link, struct dp_link_private, dp_link);
810 ret = drm_dp_dpcd_writeb(link->aux, DP_TEST_RESPONSE,
811 dp_link->test_response);
816 int dp_link_psm_config(struct dp_link *dp_link,
817 struct dp_link_info *link_info, bool enable)
819 struct dp_link_private *link = NULL;
823 DRM_ERROR("invalid params\n");
827 link = container_of(dp_link, struct dp_link_private, dp_link);
829 mutex_lock(&link->psm_mutex);
831 ret = dp_aux_link_power_down(link->aux, link_info);
833 ret = dp_aux_link_power_up(link->aux, link_info);
836 DRM_ERROR("Failed to %s low power mode\n", enable ?
839 dp_link->psm_enabled = enable;
841 mutex_unlock(&link->psm_mutex);
845 bool dp_link_send_edid_checksum(struct dp_link *dp_link, u8 checksum)
847 struct dp_link_private *link = NULL;
851 DRM_ERROR("invalid input\n");
855 link = container_of(dp_link, struct dp_link_private, dp_link);
857 ret = drm_dp_dpcd_writeb(link->aux, DP_TEST_EDID_CHECKSUM,
862 static void dp_link_parse_vx_px(struct dp_link_private *link)
864 drm_dbg_dp(link->drm_dev, "vx: 0=%d, 1=%d, 2=%d, 3=%d\n",
865 drm_dp_get_adjust_request_voltage(link->link_status, 0),
866 drm_dp_get_adjust_request_voltage(link->link_status, 1),
867 drm_dp_get_adjust_request_voltage(link->link_status, 2),
868 drm_dp_get_adjust_request_voltage(link->link_status, 3));
870 drm_dbg_dp(link->drm_dev, "px: 0=%d, 1=%d, 2=%d, 3=%d\n",
871 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 0),
872 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 1),
873 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 2),
874 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 3));
877 * Update the voltage and pre-emphasis levels as per DPCD request
880 drm_dbg_dp(link->drm_dev,
881 "Current: v_level = 0x%x, p_level = 0x%x\n",
882 link->dp_link.phy_params.v_level,
883 link->dp_link.phy_params.p_level);
884 link->dp_link.phy_params.v_level =
885 drm_dp_get_adjust_request_voltage(link->link_status, 0);
886 link->dp_link.phy_params.p_level =
887 drm_dp_get_adjust_request_pre_emphasis(link->link_status, 0);
889 link->dp_link.phy_params.p_level >>= DP_TRAIN_PRE_EMPHASIS_SHIFT;
891 drm_dbg_dp(link->drm_dev,
892 "Requested: v_level = 0x%x, p_level = 0x%x\n",
893 link->dp_link.phy_params.v_level,
894 link->dp_link.phy_params.p_level);
898 * dp_link_process_phy_test_pattern_request() - process new phy link requests
899 * @link: Display Port Driver data
901 * This function will handle new phy link pattern requests that are initiated
902 * by the sink. The function will return 0 if a phy link pattern has been
903 * processed, otherwise it will return -EINVAL.
905 static int dp_link_process_phy_test_pattern_request(
906 struct dp_link_private *link)
908 if (!(link->request.test_requested & DP_TEST_LINK_PHY_TEST_PATTERN)) {
909 drm_dbg_dp(link->drm_dev, "no phy test\n");
913 if (!is_link_rate_valid(link->request.test_link_rate) ||
914 !is_lane_count_valid(link->request.test_lane_count)) {
915 DRM_ERROR("Invalid: link rate = 0x%x,lane count = 0x%x\n",
916 link->request.test_link_rate,
917 link->request.test_lane_count);
921 drm_dbg_dp(link->drm_dev,
922 "Current: rate = 0x%x, lane count = 0x%x\n",
923 link->dp_link.link_params.rate,
924 link->dp_link.link_params.num_lanes);
926 drm_dbg_dp(link->drm_dev,
927 "Requested: rate = 0x%x, lane count = 0x%x\n",
928 link->request.test_link_rate,
929 link->request.test_lane_count);
931 link->dp_link.link_params.num_lanes = link->request.test_lane_count;
932 link->dp_link.link_params.rate =
933 drm_dp_bw_code_to_link_rate(link->request.test_link_rate);
935 dp_link_parse_vx_px(link);
940 static bool dp_link_read_psr_error_status(struct dp_link_private *link)
944 drm_dp_dpcd_read(link->aux, DP_PSR_ERROR_STATUS, &status, 1);
946 if (status & DP_PSR_LINK_CRC_ERROR)
947 DRM_ERROR("PSR LINK CRC ERROR\n");
948 else if (status & DP_PSR_RFB_STORAGE_ERROR)
949 DRM_ERROR("PSR RFB STORAGE ERROR\n");
950 else if (status & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
951 DRM_ERROR("PSR VSC SDP UNCORRECTABLE ERROR\n");
958 static bool dp_link_psr_capability_changed(struct dp_link_private *link)
962 drm_dp_dpcd_read(link->aux, DP_PSR_ESI, &status, 1);
964 if (status & DP_PSR_CAPS_CHANGE) {
965 drm_dbg_dp(link->drm_dev, "PSR Capability Change\n");
972 static u8 get_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
974 return link_status[r - DP_LANE0_1_STATUS];
978 * dp_link_process_link_status_update() - processes link status updates
979 * @link: Display Port link module data
981 * This function will check for changes in the link status, e.g. clock
982 * recovery done on all lanes, and trigger link training if there is a
983 * failure/error on the link.
985 * The function will return 0 if the a link status update has been processed,
986 * otherwise it will return -EINVAL.
988 static int dp_link_process_link_status_update(struct dp_link_private *link)
990 bool channel_eq_done = drm_dp_channel_eq_ok(link->link_status,
991 link->dp_link.link_params.num_lanes);
993 bool clock_recovery_done = drm_dp_clock_recovery_ok(link->link_status,
994 link->dp_link.link_params.num_lanes);
996 drm_dbg_dp(link->drm_dev,
997 "channel_eq_done = %d, clock_recovery_done = %d\n",
998 channel_eq_done, clock_recovery_done);
1000 if (channel_eq_done && clock_recovery_done)
1007 * dp_link_process_ds_port_status_change() - process port status changes
1008 * @link: Display Port Driver data
1010 * This function will handle downstream port updates that are initiated by
1011 * the sink. If the downstream port status has changed, the EDID is read via
1014 * The function will return 0 if a downstream port update has been
1015 * processed, otherwise it will return -EINVAL.
1017 static int dp_link_process_ds_port_status_change(struct dp_link_private *link)
1019 if (get_link_status(link->link_status, DP_LANE_ALIGN_STATUS_UPDATED) &
1020 DP_DOWNSTREAM_PORT_STATUS_CHANGED)
1023 if (link->prev_sink_count == link->dp_link.sink_count)
1027 /* reset prev_sink_count */
1028 link->prev_sink_count = link->dp_link.sink_count;
1033 static bool dp_link_is_video_pattern_requested(struct dp_link_private *link)
1035 return (link->request.test_requested & DP_TEST_LINK_VIDEO_PATTERN)
1036 && !(link->request.test_requested &
1037 DP_TEST_LINK_AUDIO_DISABLED_VIDEO);
1040 static bool dp_link_is_audio_pattern_requested(struct dp_link_private *link)
1042 return (link->request.test_requested & DP_TEST_LINK_AUDIO_PATTERN);
1045 static void dp_link_reset_data(struct dp_link_private *link)
1047 link->request = (const struct dp_link_request){ 0 };
1048 link->dp_link.test_video = (const struct dp_link_test_video){ 0 };
1049 link->dp_link.test_video.test_bit_depth = DP_TEST_BIT_DEPTH_UNKNOWN;
1050 link->dp_link.test_audio = (const struct dp_link_test_audio){ 0 };
1051 link->dp_link.phy_params.phy_test_pattern_sel = 0;
1052 link->dp_link.sink_request = 0;
1053 link->dp_link.test_response = 0;
1057 * dp_link_process_request() - handle HPD IRQ transition to HIGH
1058 * @dp_link: pointer to link module data
1060 * This function will handle the HPD IRQ state transitions from LOW to HIGH
1061 * (including cases when there are back to back HPD IRQ HIGH) indicating
1062 * the start of a new link training request or sink status update.
1064 int dp_link_process_request(struct dp_link *dp_link)
1067 struct dp_link_private *link;
1070 DRM_ERROR("invalid input\n");
1074 link = container_of(dp_link, struct dp_link_private, dp_link);
1076 dp_link_reset_data(link);
1078 ret = dp_link_parse_sink_status_field(link);
1082 if (link->request.test_requested == DP_TEST_LINK_EDID_READ) {
1083 dp_link->sink_request |= DP_TEST_LINK_EDID_READ;
1084 } else if (!dp_link_process_ds_port_status_change(link)) {
1085 dp_link->sink_request |= DS_PORT_STATUS_CHANGED;
1086 } else if (!dp_link_process_link_training_request(link)) {
1087 dp_link->sink_request |= DP_TEST_LINK_TRAINING;
1088 } else if (!dp_link_process_phy_test_pattern_request(link)) {
1089 dp_link->sink_request |= DP_TEST_LINK_PHY_TEST_PATTERN;
1090 } else if (dp_link_read_psr_error_status(link)) {
1091 DRM_ERROR("PSR IRQ_HPD received\n");
1092 } else if (dp_link_psr_capability_changed(link)) {
1093 drm_dbg_dp(link->drm_dev, "PSR Capability changed");
1095 ret = dp_link_process_link_status_update(link);
1097 dp_link->sink_request |= DP_LINK_STATUS_UPDATED;
1099 if (dp_link_is_video_pattern_requested(link)) {
1101 dp_link->sink_request |= DP_TEST_LINK_VIDEO_PATTERN;
1103 if (dp_link_is_audio_pattern_requested(link)) {
1104 dp_link->sink_request |= DP_TEST_LINK_AUDIO_PATTERN;
1110 drm_dbg_dp(link->drm_dev, "sink request=%#x",
1111 dp_link->sink_request);
1115 int dp_link_get_colorimetry_config(struct dp_link *dp_link)
1118 struct dp_link_private *link;
1121 DRM_ERROR("invalid input\n");
1125 link = container_of(dp_link, struct dp_link_private, dp_link);
1128 * Unless a video pattern CTS test is ongoing, use RGB_VESA
1129 * Only RGB_VESA and RGB_CEA supported for now
1131 if (dp_link_is_video_pattern_requested(link))
1132 cc = link->dp_link.test_video.test_dyn_range;
1134 cc = DP_TEST_DYNAMIC_RANGE_VESA;
1139 int dp_link_adjust_levels(struct dp_link *dp_link, u8 *link_status)
1142 int v_max = 0, p_max = 0;
1143 struct dp_link_private *link;
1146 DRM_ERROR("invalid input\n");
1150 link = container_of(dp_link, struct dp_link_private, dp_link);
1152 /* use the max level across lanes */
1153 for (i = 0; i < dp_link->link_params.num_lanes; i++) {
1154 u8 data_v = drm_dp_get_adjust_request_voltage(link_status, i);
1155 u8 data_p = drm_dp_get_adjust_request_pre_emphasis(link_status,
1157 drm_dbg_dp(link->drm_dev,
1158 "lane=%d req_vol_swing=%d req_pre_emphasis=%d\n",
1166 dp_link->phy_params.v_level = v_max >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
1167 dp_link->phy_params.p_level = p_max >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
1170 * Adjust the voltage swing and pre-emphasis level combination to within
1171 * the allowable range.
1173 if (dp_link->phy_params.v_level > DP_TRAIN_VOLTAGE_SWING_MAX) {
1174 drm_dbg_dp(link->drm_dev,
1175 "Requested vSwingLevel=%d, change to %d\n",
1176 dp_link->phy_params.v_level,
1177 DP_TRAIN_VOLTAGE_SWING_MAX);
1178 dp_link->phy_params.v_level = DP_TRAIN_VOLTAGE_SWING_MAX;
1181 if (dp_link->phy_params.p_level > DP_TRAIN_PRE_EMPHASIS_MAX) {
1182 drm_dbg_dp(link->drm_dev,
1183 "Requested preEmphasisLevel=%d, change to %d\n",
1184 dp_link->phy_params.p_level,
1185 DP_TRAIN_PRE_EMPHASIS_MAX);
1186 dp_link->phy_params.p_level = DP_TRAIN_PRE_EMPHASIS_MAX;
1189 if ((dp_link->phy_params.p_level > DP_TRAIN_PRE_EMPHASIS_LVL_1)
1190 && (dp_link->phy_params.v_level ==
1191 DP_TRAIN_VOLTAGE_SWING_LVL_2)) {
1192 drm_dbg_dp(link->drm_dev,
1193 "Requested preEmphasisLevel=%d, change to %d\n",
1194 dp_link->phy_params.p_level,
1195 DP_TRAIN_PRE_EMPHASIS_LVL_1);
1196 dp_link->phy_params.p_level = DP_TRAIN_PRE_EMPHASIS_LVL_1;
1199 drm_dbg_dp(link->drm_dev, "adjusted: v_level=%d, p_level=%d\n",
1200 dp_link->phy_params.v_level, dp_link->phy_params.p_level);
1205 void dp_link_reset_phy_params_vx_px(struct dp_link *dp_link)
1207 dp_link->phy_params.v_level = 0;
1208 dp_link->phy_params.p_level = 0;
1211 u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp)
1216 * Few simplistic rules and assumptions made here:
1217 * 1. Test bit depth is bit depth per color component
1218 * 2. Assume 3 color components
1222 tbd = DP_TEST_BIT_DEPTH_6;
1225 tbd = DP_TEST_BIT_DEPTH_8;
1228 tbd = DP_TEST_BIT_DEPTH_10;
1231 tbd = DP_TEST_BIT_DEPTH_UNKNOWN;
1235 if (tbd != DP_TEST_BIT_DEPTH_UNKNOWN)
1236 tbd = (tbd >> DP_TEST_BIT_DEPTH_SHIFT);
1241 struct dp_link *dp_link_get(struct device *dev, struct drm_dp_aux *aux)
1243 struct dp_link_private *link;
1244 struct dp_link *dp_link;
1247 DRM_ERROR("invalid input\n");
1248 return ERR_PTR(-EINVAL);
1251 link = devm_kzalloc(dev, sizeof(*link), GFP_KERNEL);
1253 return ERR_PTR(-ENOMEM);
1258 mutex_init(&link->psm_mutex);
1259 dp_link = &link->dp_link;