1/*
2 * Copyright © 2016 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 *
24 */
25
26#include <drm/display/drm_dp_dual_mode_helper.h>
27#include <drm/display/drm_hdmi_helper.h>
28#include <drm/drm_atomic_helper.h>
29#include <drm/drm_edid.h>
30
31#include "i915_reg.h"
32#include "intel_de.h"
33#include "intel_display_types.h"
34#include "intel_dp.h"
35#include "intel_lspcon.h"
36#include "intel_hdmi.h"
37
38/* LSPCON OUI Vendor ID(signatures) */
39#define LSPCON_VENDOR_PARADE_OUI 0x001CF8
40#define LSPCON_VENDOR_MCA_OUI 0x0060AD
41
42#define DPCD_MCA_LSPCON_HDR_STATUS 0x70003
43#define DPCD_PARADE_LSPCON_HDR_STATUS 0x00511
44
45/* AUX addresses to write MCA AVI IF */
46#define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0
47#define LSPCON_MCA_AVI_IF_CTRL 0x5DF
48#define LSPCON_MCA_AVI_IF_KICKOFF (1 << 0)
49#define LSPCON_MCA_AVI_IF_HANDLED (1 << 1)
50
51/* AUX addresses to write Parade AVI IF */
52#define LSPCON_PARADE_AVI_IF_WRITE_OFFSET 0x516
53#define LSPCON_PARADE_AVI_IF_CTRL 0x51E
54#define LSPCON_PARADE_AVI_IF_KICKOFF (1 << 7)
55#define LSPCON_PARADE_AVI_IF_DATA_SIZE 32
56
57static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
58{
59 struct intel_digital_port *dig_port =
60 container_of(lspcon, struct intel_digital_port, lspcon);
61
62 return &dig_port->dp;
63}
64
65static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
66{
67 switch (mode) {
68 case DRM_LSPCON_MODE_PCON:
69 return "PCON";
70 case DRM_LSPCON_MODE_LS:
71 return "LS";
72 case DRM_LSPCON_MODE_INVALID:
73 return "INVALID";
74 default:
75 MISSING_CASE(mode);
76 return "INVALID";
77 }
78}
79
80static bool lspcon_detect_vendor(struct intel_lspcon *lspcon)
81{
82 struct intel_dp *dp = lspcon_to_intel_dp(lspcon);
83 struct drm_i915_private *i915 = dp_to_i915(dp);
84 struct drm_dp_dpcd_ident *ident;
85 u32 vendor_oui;
86
87 if (drm_dp_read_desc(aux: &dp->aux, desc: &dp->desc, is_branch: drm_dp_is_branch(dpcd: dp->dpcd))) {
88 drm_err(&i915->drm, "Can't read description\n");
89 return false;
90 }
91
92 ident = &dp->desc.ident;
93 vendor_oui = (ident->oui[0] << 16) | (ident->oui[1] << 8) |
94 ident->oui[2];
95
96 switch (vendor_oui) {
97 case LSPCON_VENDOR_MCA_OUI:
98 lspcon->vendor = LSPCON_VENDOR_MCA;
99 drm_dbg_kms(&i915->drm, "Vendor: Mega Chips\n");
100 break;
101
102 case LSPCON_VENDOR_PARADE_OUI:
103 lspcon->vendor = LSPCON_VENDOR_PARADE;
104 drm_dbg_kms(&i915->drm, "Vendor: Parade Tech\n");
105 break;
106
107 default:
108 drm_err(&i915->drm, "Invalid/Unknown vendor OUI\n");
109 return false;
110 }
111
112 return true;
113}
114
115static u32 get_hdr_status_reg(struct intel_lspcon *lspcon)
116{
117 if (lspcon->vendor == LSPCON_VENDOR_MCA)
118 return DPCD_MCA_LSPCON_HDR_STATUS;
119 else
120 return DPCD_PARADE_LSPCON_HDR_STATUS;
121}
122
123void lspcon_detect_hdr_capability(struct intel_lspcon *lspcon)
124{
125 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
126 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
127 u8 hdr_caps;
128 int ret;
129
130 ret = drm_dp_dpcd_read(aux: &intel_dp->aux, offset: get_hdr_status_reg(lspcon),
131 buffer: &hdr_caps, size: 1);
132
133 if (ret < 0) {
134 drm_dbg_kms(&i915->drm, "HDR capability detection failed\n");
135 lspcon->hdr_supported = false;
136 } else if (hdr_caps & 0x1) {
137 drm_dbg_kms(&i915->drm, "LSPCON capable of HDR\n");
138 lspcon->hdr_supported = true;
139 }
140}
141
142static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
143{
144 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
145 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
146 enum drm_lspcon_mode current_mode;
147 struct i2c_adapter *ddc = &intel_dp->aux.ddc;
148
149 if (drm_lspcon_get_mode(dev: intel_dp->aux.drm_dev, adapter: ddc, current_mode: &current_mode)) {
150 drm_dbg_kms(&i915->drm, "Error reading LSPCON mode\n");
151 return DRM_LSPCON_MODE_INVALID;
152 }
153 return current_mode;
154}
155
156static int lspcon_get_mode_settle_timeout(struct intel_lspcon *lspcon)
157{
158 /*
159 * On some CometLake-based device designs the Parade PS175 takes more
160 * than 400ms to settle in PCON mode. 100 reboot trials on one device
161 * resulted in a median settle time of 440ms and a maximum of 444ms.
162 * Even after increasing the timeout to 500ms, 2% of devices still had
163 * this error. So this sets the timeout to 800ms.
164 */
165 return lspcon->vendor == LSPCON_VENDOR_PARADE ? 800 : 400;
166}
167
168static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
169 enum drm_lspcon_mode mode)
170{
171 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
172 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
173 enum drm_lspcon_mode current_mode;
174
175 current_mode = lspcon_get_current_mode(lspcon);
176 if (current_mode == mode)
177 goto out;
178
179 drm_dbg_kms(&i915->drm, "Waiting for LSPCON mode %s to settle\n",
180 lspcon_mode_name(mode));
181
182 wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode,
183 lspcon_get_mode_settle_timeout(lspcon));
184 if (current_mode != mode)
185 drm_err(&i915->drm, "LSPCON mode hasn't settled\n");
186
187out:
188 drm_dbg_kms(&i915->drm, "Current LSPCON mode %s\n",
189 lspcon_mode_name(current_mode));
190
191 return current_mode;
192}
193
194static int lspcon_change_mode(struct intel_lspcon *lspcon,
195 enum drm_lspcon_mode mode)
196{
197 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
198 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
199 int err;
200 enum drm_lspcon_mode current_mode;
201 struct i2c_adapter *ddc = &intel_dp->aux.ddc;
202
203 err = drm_lspcon_get_mode(dev: intel_dp->aux.drm_dev, adapter: ddc, current_mode: &current_mode);
204 if (err) {
205 drm_err(&i915->drm, "Error reading LSPCON mode\n");
206 return err;
207 }
208
209 if (current_mode == mode) {
210 drm_dbg_kms(&i915->drm, "Current mode = desired LSPCON mode\n");
211 return 0;
212 }
213
214 err = drm_lspcon_set_mode(dev: intel_dp->aux.drm_dev, adapter: ddc, reqd_mode: mode);
215 if (err < 0) {
216 drm_err(&i915->drm, "LSPCON mode change failed\n");
217 return err;
218 }
219
220 lspcon->mode = mode;
221 drm_dbg_kms(&i915->drm, "LSPCON mode changed done\n");
222 return 0;
223}
224
225static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon)
226{
227 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
228 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
229 u8 rev;
230
231 if (drm_dp_dpcd_readb(aux: &lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
232 valuep: &rev) != 1) {
233 drm_dbg_kms(&i915->drm, "Native AUX CH down\n");
234 return false;
235 }
236
237 drm_dbg_kms(&i915->drm, "Native AUX CH up, DPCD version: %d.%d\n",
238 rev >> 4, rev & 0xf);
239
240 return true;
241}
242
243static bool lspcon_probe(struct intel_lspcon *lspcon)
244{
245 int retry;
246 enum drm_dp_dual_mode_type adaptor_type;
247 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
248 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
249 struct i2c_adapter *ddc = &intel_dp->aux.ddc;
250 enum drm_lspcon_mode expected_mode;
251
252 expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
253 DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;
254
255 /* Lets probe the adaptor and check its type */
256 for (retry = 0; retry < 6; retry++) {
257 if (retry)
258 usleep_range(min: 500, max: 1000);
259
260 adaptor_type = drm_dp_dual_mode_detect(dev: intel_dp->aux.drm_dev, adapter: ddc);
261 if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON)
262 break;
263 }
264
265 if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
266 drm_dbg_kms(&i915->drm, "No LSPCON detected, found %s\n",
267 drm_dp_get_dual_mode_type_name(adaptor_type));
268 return false;
269 }
270
271 /* Yay ... got a LSPCON device */
272 drm_dbg_kms(&i915->drm, "LSPCON detected\n");
273 lspcon->mode = lspcon_wait_mode(lspcon, mode: expected_mode);
274
275 /*
276 * In the SW state machine, lets Put LSPCON in PCON mode only.
277 * In this way, it will work with both HDMI 1.4 sinks as well as HDMI
278 * 2.0 sinks.
279 */
280 if (lspcon->mode != DRM_LSPCON_MODE_PCON) {
281 if (lspcon_change_mode(lspcon, mode: DRM_LSPCON_MODE_PCON) < 0) {
282 drm_err(&i915->drm, "LSPCON mode change to PCON failed\n");
283 return false;
284 }
285 }
286 return true;
287}
288
289static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
290{
291 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
292 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
293 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
294 unsigned long start = jiffies;
295
296 while (1) {
297 if (intel_digital_port_connected(encoder: &dig_port->base)) {
298 drm_dbg_kms(&i915->drm, "LSPCON recovering in PCON mode after %u ms\n",
299 jiffies_to_msecs(jiffies - start));
300 return;
301 }
302
303 if (time_after(jiffies, start + msecs_to_jiffies(1000)))
304 break;
305
306 usleep_range(min: 10000, max: 15000);
307 }
308
309 drm_dbg_kms(&i915->drm, "LSPCON DP descriptor mismatch after resume\n");
310}
311
312static bool lspcon_parade_fw_ready(struct drm_dp_aux *aux)
313{
314 u8 avi_if_ctrl;
315 u8 retry;
316 ssize_t ret;
317
318 /* Check if LSPCON FW is ready for data */
319 for (retry = 0; retry < 5; retry++) {
320 if (retry)
321 usleep_range(min: 200, max: 300);
322
323 ret = drm_dp_dpcd_read(aux, LSPCON_PARADE_AVI_IF_CTRL,
324 buffer: &avi_if_ctrl, size: 1);
325 if (ret < 0) {
326 drm_err(aux->drm_dev, "Failed to read AVI IF control\n");
327 return false;
328 }
329
330 if ((avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF) == 0)
331 return true;
332 }
333
334 drm_err(aux->drm_dev, "Parade FW not ready to accept AVI IF\n");
335 return false;
336}
337
338static bool _lspcon_parade_write_infoframe_blocks(struct drm_dp_aux *aux,
339 u8 *avi_buf)
340{
341 u8 avi_if_ctrl;
342 u8 block_count = 0;
343 u8 *data;
344 u16 reg;
345 ssize_t ret;
346
347 while (block_count < 4) {
348 if (!lspcon_parade_fw_ready(aux)) {
349 drm_dbg_kms(aux->drm_dev, "LSPCON FW not ready, block %d\n",
350 block_count);
351 return false;
352 }
353
354 reg = LSPCON_PARADE_AVI_IF_WRITE_OFFSET;
355 data = avi_buf + block_count * 8;
356 ret = drm_dp_dpcd_write(aux, offset: reg, buffer: data, size: 8);
357 if (ret < 0) {
358 drm_err(aux->drm_dev, "Failed to write AVI IF block %d\n",
359 block_count);
360 return false;
361 }
362
363 /*
364 * Once a block of data is written, we have to inform the FW
365 * about this by writing into avi infoframe control register:
366 * - set the kickoff bit[7] to 1
367 * - write the block no. to bits[1:0]
368 */
369 reg = LSPCON_PARADE_AVI_IF_CTRL;
370 avi_if_ctrl = LSPCON_PARADE_AVI_IF_KICKOFF | block_count;
371 ret = drm_dp_dpcd_write(aux, offset: reg, buffer: &avi_if_ctrl, size: 1);
372 if (ret < 0) {
373 drm_err(aux->drm_dev, "Failed to update (0x%x), block %d\n",
374 reg, block_count);
375 return false;
376 }
377
378 block_count++;
379 }
380
381 drm_dbg_kms(aux->drm_dev, "Wrote AVI IF blocks successfully\n");
382 return true;
383}
384
385static bool _lspcon_write_avi_infoframe_parade(struct drm_dp_aux *aux,
386 const u8 *frame,
387 ssize_t len)
388{
389 u8 avi_if[LSPCON_PARADE_AVI_IF_DATA_SIZE] = {1, };
390
391 /*
392 * Parade's frames contains 32 bytes of data, divided
393 * into 4 frames:
394 * Token byte (first byte of first frame, must be non-zero)
395 * HB0 to HB2 from AVI IF (3 bytes header)
396 * PB0 to PB27 from AVI IF (28 bytes data)
397 * So it should look like this
398 * first block: | <token> <HB0-HB2> <DB0-DB3> |
399 * next 3 blocks: |<DB4-DB11>|<DB12-DB19>|<DB20-DB28>|
400 */
401
402 if (len > LSPCON_PARADE_AVI_IF_DATA_SIZE - 1) {
403 drm_err(aux->drm_dev, "Invalid length of infoframes\n");
404 return false;
405 }
406
407 memcpy(&avi_if[1], frame, len);
408
409 if (!_lspcon_parade_write_infoframe_blocks(aux, avi_buf: avi_if)) {
410 drm_dbg_kms(aux->drm_dev, "Failed to write infoframe blocks\n");
411 return false;
412 }
413
414 return true;
415}
416
417static bool _lspcon_write_avi_infoframe_mca(struct drm_dp_aux *aux,
418 const u8 *buffer, ssize_t len)
419{
420 int ret;
421 u32 val = 0;
422 u32 retry;
423 u16 reg;
424 const u8 *data = buffer;
425
426 reg = LSPCON_MCA_AVI_IF_WRITE_OFFSET;
427 while (val < len) {
428 /* DPCD write for AVI IF can fail on a slow FW day, so retry */
429 for (retry = 0; retry < 5; retry++) {
430 ret = drm_dp_dpcd_write(aux, offset: reg, buffer: (void *)data, size: 1);
431 if (ret == 1) {
432 break;
433 } else if (retry < 4) {
434 mdelay(50);
435 continue;
436 } else {
437 drm_err(aux->drm_dev, "DPCD write failed at:0x%x\n", reg);
438 return false;
439 }
440 }
441 val++; reg++; data++;
442 }
443
444 val = 0;
445 reg = LSPCON_MCA_AVI_IF_CTRL;
446 ret = drm_dp_dpcd_read(aux, offset: reg, buffer: &val, size: 1);
447 if (ret < 0) {
448 drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
449 return false;
450 }
451
452 /* Indicate LSPCON chip about infoframe, clear bit 1 and set bit 0 */
453 val &= ~LSPCON_MCA_AVI_IF_HANDLED;
454 val |= LSPCON_MCA_AVI_IF_KICKOFF;
455
456 ret = drm_dp_dpcd_write(aux, offset: reg, buffer: &val, size: 1);
457 if (ret < 0) {
458 drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
459 return false;
460 }
461
462 val = 0;
463 ret = drm_dp_dpcd_read(aux, offset: reg, buffer: &val, size: 1);
464 if (ret < 0) {
465 drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
466 return false;
467 }
468
469 if (val == LSPCON_MCA_AVI_IF_HANDLED)
470 drm_dbg_kms(aux->drm_dev, "AVI IF handled by FW\n");
471
472 return true;
473}
474
475void lspcon_write_infoframe(struct intel_encoder *encoder,
476 const struct intel_crtc_state *crtc_state,
477 unsigned int type,
478 const void *frame, ssize_t len)
479{
480 bool ret = true;
481 struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
482 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
483 struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
484
485 switch (type) {
486 case HDMI_INFOFRAME_TYPE_AVI:
487 if (lspcon->vendor == LSPCON_VENDOR_MCA)
488 ret = _lspcon_write_avi_infoframe_mca(aux: &intel_dp->aux,
489 buffer: frame, len);
490 else
491 ret = _lspcon_write_avi_infoframe_parade(aux: &intel_dp->aux,
492 frame, len);
493 break;
494 case HDMI_PACKET_TYPE_GAMUT_METADATA:
495 drm_dbg_kms(&i915->drm, "Update HDR metadata for lspcon\n");
496 /* It uses the legacy hsw implementation for the same */
497 hsw_write_infoframe(encoder, crtc_state, type, frame, len);
498 break;
499 default:
500 return;
501 }
502
503 if (!ret) {
504 drm_err(&i915->drm, "Failed to write infoframes\n");
505 return;
506 }
507}
508
509void lspcon_read_infoframe(struct intel_encoder *encoder,
510 const struct intel_crtc_state *crtc_state,
511 unsigned int type,
512 void *frame, ssize_t len)
513{
514 /* FIXME implement for AVI Infoframe as well */
515 if (type == HDMI_PACKET_TYPE_GAMUT_METADATA)
516 hsw_read_infoframe(encoder, crtc_state, type,
517 frame, len);
518}
519
520void lspcon_set_infoframes(struct intel_encoder *encoder,
521 bool enable,
522 const struct intel_crtc_state *crtc_state,
523 const struct drm_connector_state *conn_state)
524{
525 ssize_t ret;
526 union hdmi_infoframe frame;
527 u8 buf[VIDEO_DIP_DATA_SIZE];
528 struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
529 struct intel_lspcon *lspcon = &dig_port->lspcon;
530 struct drm_i915_private *i915 = to_i915(dev: encoder->base.dev);
531 const struct drm_display_mode *adjusted_mode =
532 &crtc_state->hw.adjusted_mode;
533
534 if (!lspcon->active) {
535 drm_err(&i915->drm, "Writing infoframes while LSPCON disabled ?\n");
536 return;
537 }
538
539 /* FIXME precompute infoframes */
540
541 ret = drm_hdmi_avi_infoframe_from_display_mode(frame: &frame.avi,
542 connector: conn_state->connector,
543 mode: adjusted_mode);
544 if (ret < 0) {
545 drm_err(&i915->drm, "couldn't fill AVI infoframe\n");
546 return;
547 }
548
549 /*
550 * Currently there is no interface defined to
551 * check user preference between RGB/YCBCR444
552 * or YCBCR420. So the only possible case for
553 * YCBCR444 usage is driving YCBCR420 output
554 * with LSPCON, when pipe is configured for
555 * YCBCR444 output and LSPCON takes care of
556 * downsampling it.
557 */
558 if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
559 frame.avi.colorspace = HDMI_COLORSPACE_YUV420;
560 else
561 frame.avi.colorspace = HDMI_COLORSPACE_RGB;
562
563 /* Set the Colorspace as per the HDMI spec */
564 drm_hdmi_avi_infoframe_colorimetry(frame: &frame.avi, conn_state);
565
566 /* nonsense combination */
567 drm_WARN_ON(encoder->base.dev, crtc_state->limited_color_range &&
568 crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB);
569
570 if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_RGB) {
571 drm_hdmi_avi_infoframe_quant_range(frame: &frame.avi,
572 connector: conn_state->connector,
573 mode: adjusted_mode,
574 rgb_quant_range: crtc_state->limited_color_range ?
575 HDMI_QUANTIZATION_RANGE_LIMITED :
576 HDMI_QUANTIZATION_RANGE_FULL);
577 } else {
578 frame.avi.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
579 frame.avi.ycc_quantization_range = HDMI_YCC_QUANTIZATION_RANGE_LIMITED;
580 }
581
582 drm_hdmi_avi_infoframe_content_type(frame: &frame.avi, conn_state);
583
584 ret = hdmi_infoframe_pack(frame: &frame, buffer: buf, size: sizeof(buf));
585 if (ret < 0) {
586 drm_err(&i915->drm, "Failed to pack AVI IF\n");
587 return;
588 }
589
590 dig_port->write_infoframe(encoder, crtc_state, HDMI_INFOFRAME_TYPE_AVI,
591 buf, ret);
592}
593
594static bool _lspcon_read_avi_infoframe_enabled_mca(struct drm_dp_aux *aux)
595{
596 int ret;
597 u32 val = 0;
598 u16 reg = LSPCON_MCA_AVI_IF_CTRL;
599
600 ret = drm_dp_dpcd_read(aux, offset: reg, buffer: &val, size: 1);
601 if (ret < 0) {
602 drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
603 return false;
604 }
605
606 return val & LSPCON_MCA_AVI_IF_KICKOFF;
607}
608
609static bool _lspcon_read_avi_infoframe_enabled_parade(struct drm_dp_aux *aux)
610{
611 int ret;
612 u32 val = 0;
613 u16 reg = LSPCON_PARADE_AVI_IF_CTRL;
614
615 ret = drm_dp_dpcd_read(aux, offset: reg, buffer: &val, size: 1);
616 if (ret < 0) {
617 drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
618 return false;
619 }
620
621 return val & LSPCON_PARADE_AVI_IF_KICKOFF;
622}
623
624u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
625 const struct intel_crtc_state *pipe_config)
626{
627 struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
628 struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
629 struct drm_i915_private *dev_priv = to_i915(dev: encoder->base.dev);
630 bool infoframes_enabled;
631 u32 val = 0;
632 u32 mask, tmp;
633
634 if (lspcon->vendor == LSPCON_VENDOR_MCA)
635 infoframes_enabled = _lspcon_read_avi_infoframe_enabled_mca(aux: &intel_dp->aux);
636 else
637 infoframes_enabled = _lspcon_read_avi_infoframe_enabled_parade(aux: &intel_dp->aux);
638
639 if (infoframes_enabled)
640 val |= intel_hdmi_infoframe_enable(type: HDMI_INFOFRAME_TYPE_AVI);
641
642 if (lspcon->hdr_supported) {
643 tmp = intel_de_read(i915: dev_priv,
644 HSW_TVIDEO_DIP_CTL(pipe_config->cpu_transcoder));
645 mask = VIDEO_DIP_ENABLE_GMP_HSW;
646
647 if (tmp & mask)
648 val |= intel_hdmi_infoframe_enable(type: HDMI_PACKET_TYPE_GAMUT_METADATA);
649 }
650
651 return val;
652}
653
654void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
655{
656 lspcon_wait_mode(lspcon, mode: DRM_LSPCON_MODE_PCON);
657}
658
659bool lspcon_init(struct intel_digital_port *dig_port)
660{
661 struct intel_dp *intel_dp = &dig_port->dp;
662 struct intel_lspcon *lspcon = &dig_port->lspcon;
663 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
664 struct drm_connector *connector = &intel_dp->attached_connector->base;
665
666 lspcon->active = false;
667 lspcon->mode = DRM_LSPCON_MODE_INVALID;
668
669 if (!lspcon_probe(lspcon)) {
670 drm_err(&i915->drm, "Failed to probe lspcon\n");
671 return false;
672 }
673
674 if (drm_dp_read_dpcd_caps(aux: &intel_dp->aux, dpcd: intel_dp->dpcd) != 0) {
675 drm_err(&i915->drm, "LSPCON DPCD read failed\n");
676 return false;
677 }
678
679 if (!lspcon_detect_vendor(lspcon)) {
680 drm_err(&i915->drm, "LSPCON vendor detection failed\n");
681 return false;
682 }
683
684 connector->ycbcr_420_allowed = true;
685 lspcon->active = true;
686 drm_dbg_kms(&i915->drm, "Success: LSPCON init\n");
687 return true;
688}
689
690u32 intel_lspcon_infoframes_enabled(struct intel_encoder *encoder,
691 const struct intel_crtc_state *pipe_config)
692{
693 struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
694
695 return dig_port->infoframes_enabled(encoder, pipe_config);
696}
697
698void lspcon_resume(struct intel_digital_port *dig_port)
699{
700 struct intel_lspcon *lspcon = &dig_port->lspcon;
701 struct drm_device *dev = dig_port->base.base.dev;
702 struct drm_i915_private *i915 = to_i915(dev);
703 enum drm_lspcon_mode expected_mode;
704
705 if (!intel_bios_encoder_is_lspcon(devdata: dig_port->base.devdata))
706 return;
707
708 if (!lspcon->active) {
709 if (!lspcon_init(dig_port)) {
710 drm_err(&i915->drm, "LSPCON init failed on port %c\n",
711 port_name(dig_port->base.port));
712 return;
713 }
714 }
715
716 if (lspcon_wake_native_aux_ch(lspcon)) {
717 expected_mode = DRM_LSPCON_MODE_PCON;
718 lspcon_resume_in_pcon_wa(lspcon);
719 } else {
720 expected_mode = DRM_LSPCON_MODE_LS;
721 }
722
723 if (lspcon_wait_mode(lspcon, mode: expected_mode) == DRM_LSPCON_MODE_PCON)
724 return;
725
726 if (lspcon_change_mode(lspcon, mode: DRM_LSPCON_MODE_PCON))
727 drm_err(&i915->drm, "LSPCON resume failed\n");
728 else
729 drm_dbg_kms(&i915->drm, "LSPCON resume success\n");
730}
731

source code of linux/drivers/gpu/drm/i915/display/intel_lspcon.c