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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2020-2021 Intel Corporation
4 */
5
6#include "i915_drv.h"
7#include "i915_reg.h"
8#include "i915_trace.h"
9#include "intel_bios.h"
10#include "intel_de.h"
11#include "intel_display_types.h"
12#include "intel_dp.h"
13#include "intel_dp_aux.h"
14#include "intel_dp_aux_regs.h"
15#include "intel_pps.h"
16#include "intel_quirks.h"
17#include "intel_tc.h"
18
19#define AUX_CH_NAME_BUFSIZE 6
20
21static const char *aux_ch_name(struct intel_display *display,
22 char *buf, int size, enum aux_ch aux_ch)
23{
24 if (DISPLAY_VER(display) >= 13 && aux_ch >= AUX_CH_D_XELPD)
25 snprintf(buf, size, "%c", 'A' + aux_ch - AUX_CH_D_XELPD + AUX_CH_D);
26 else if (DISPLAY_VER(display) >= 12 && aux_ch >= AUX_CH_USBC1)
27 snprintf(buf, size, "USBC%c", '1' + aux_ch - AUX_CH_USBC1);
28 else
29 snprintf(buf, size, "%c", 'A' + aux_ch);
30
31 return buf;
32}
33
34u32 intel_dp_aux_pack(const u8 *src, int src_bytes)
35{
36 int i;
37 u32 v = 0;
38
39 if (src_bytes > 4)
40 src_bytes = 4;
41 for (i = 0; i < src_bytes; i++)
42 v |= ((u32)src[i]) << ((3 - i) * 8);
43 return v;
44}
45
46static void intel_dp_aux_unpack(u32 src, u8 *dst, int dst_bytes)
47{
48 int i;
49
50 if (dst_bytes > 4)
51 dst_bytes = 4;
52 for (i = 0; i < dst_bytes; i++)
53 dst[i] = src >> ((3 - i) * 8);
54}
55
56static u32
57intel_dp_aux_wait_done(struct intel_dp *intel_dp)
58{
59 struct intel_display *display = to_intel_display(intel_dp);
60 i915_reg_t ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
61 const unsigned int timeout_ms = 10;
62 u32 status;
63 int ret;
64
65 ret = intel_de_wait_custom(display, ch_ctl, DP_AUX_CH_CTL_SEND_BUSY,
66 0,
67 2, timeout_ms, &status);
68
69 if (ret == -ETIMEDOUT)
70 drm_err(display->drm,
71 "%s: did not complete or timeout within %ums (status 0x%08x)\n",
72 intel_dp->aux.name, timeout_ms, status);
73
74 return status;
75}
76
77static u32 g4x_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
78{
79 struct intel_display *display = to_intel_display(intel_dp);
80
81 if (index)
82 return 0;
83
84 /*
85 * The clock divider is based off the hrawclk, and would like to run at
86 * 2MHz. So, take the hrawclk value and divide by 2000 and use that
87 */
88 return DIV_ROUND_CLOSEST(DISPLAY_RUNTIME_INFO(display)->rawclk_freq, 2000);
89}
90
91static u32 ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
92{
93 struct intel_display *display = to_intel_display(intel_dp);
94 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
95 u32 freq;
96
97 if (index)
98 return 0;
99
100 /*
101 * The clock divider is based off the cdclk or PCH rawclk, and would
102 * like to run at 2MHz. So, take the cdclk or PCH rawclk value and
103 * divide by 2000 and use that
104 */
105 if (dig_port->aux_ch == AUX_CH_A)
106 freq = display->cdclk.hw.cdclk;
107 else
108 freq = DISPLAY_RUNTIME_INFO(display)->rawclk_freq;
109 return DIV_ROUND_CLOSEST(freq, 2000);
110}
111
112static u32 hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
113{
114 struct intel_display *display = to_intel_display(intel_dp);
115 struct drm_i915_private *i915 = to_i915(display->drm);
116 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
117
118 if (dig_port->aux_ch != AUX_CH_A && HAS_PCH_LPT_H(i915)) {
119 /* Workaround for non-ULT HSW */
120 switch (index) {
121 case 0: return 63;
122 case 1: return 72;
123 default: return 0;
124 }
125 }
126
127 return ilk_get_aux_clock_divider(intel_dp, index);
128}
129
130static u32 skl_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
131{
132 /*
133 * SKL doesn't need us to program the AUX clock divider (Hardware will
134 * derive the clock from CDCLK automatically). We still implement the
135 * get_aux_clock_divider vfunc to plug-in into the existing code.
136 */
137 return index ? 0 : 1;
138}
139
140static int intel_dp_aux_sync_len(void)
141{
142 int precharge = 16; /* 10-16 */
143 int preamble = 16;
144
145 return precharge + preamble;
146}
147
148int intel_dp_aux_fw_sync_len(struct intel_dp *intel_dp)
149{
150 int precharge = 10; /* 10-16 */
151 int preamble = 8;
152
153 /*
154 * We faced some glitches on Dell Precision 5490 MTL laptop with panel:
155 * "Manufacturer: AUO, Model: 63898" when using HW default 18. Using 20
156 * is fixing these problems with the panel. It is still within range
157 * mentioned in eDP specification. Increasing Fast Wake sync length is
158 * causing problems with other panels: increase length as a quirk for
159 * this specific laptop.
160 */
161 if (intel_has_dpcd_quirk(intel_dp, QUIRK_FW_SYNC_LEN))
162 precharge += 2;
163
164 return precharge + preamble;
165}
166
167static int g4x_dp_aux_precharge_len(void)
168{
169 int precharge_min = 10;
170 int preamble = 16;
171
172 /* HW wants the length of the extra precharge in 2us units */
173 return (intel_dp_aux_sync_len() -
174 precharge_min - preamble) / 2;
175}
176
177static u32 g4x_get_aux_send_ctl(struct intel_dp *intel_dp,
178 int send_bytes,
179 u32 aux_clock_divider)
180{
181 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
182 struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
183 u32 timeout;
184
185 /* Max timeout value on G4x-BDW: 1.6ms */
186 if (IS_BROADWELL(i915))
187 timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
188 else
189 timeout = DP_AUX_CH_CTL_TIME_OUT_400us;
190
191 return DP_AUX_CH_CTL_SEND_BUSY |
192 DP_AUX_CH_CTL_DONE |
193 DP_AUX_CH_CTL_INTERRUPT |
194 DP_AUX_CH_CTL_TIME_OUT_ERROR |
195 timeout |
196 DP_AUX_CH_CTL_RECEIVE_ERROR |
197 DP_AUX_CH_CTL_MESSAGE_SIZE(send_bytes) |
198 DP_AUX_CH_CTL_PRECHARGE_2US(g4x_dp_aux_precharge_len()) |
199 DP_AUX_CH_CTL_BIT_CLOCK_2X(aux_clock_divider);
200}
201
202static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp,
203 int send_bytes,
204 u32 unused)
205{
206 struct intel_display *display = to_intel_display(intel_dp);
207 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
208 u32 ret;
209
210 /*
211 * Max timeout values:
212 * SKL-GLK: 1.6ms
213 * ICL+: 4ms
214 */
215 ret = DP_AUX_CH_CTL_SEND_BUSY |
216 DP_AUX_CH_CTL_DONE |
217 DP_AUX_CH_CTL_INTERRUPT |
218 DP_AUX_CH_CTL_TIME_OUT_ERROR |
219 DP_AUX_CH_CTL_TIME_OUT_MAX |
220 DP_AUX_CH_CTL_RECEIVE_ERROR |
221 DP_AUX_CH_CTL_MESSAGE_SIZE(send_bytes) |
222 DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(intel_dp_aux_fw_sync_len(intel_dp)) |
223 DP_AUX_CH_CTL_SYNC_PULSE_SKL(intel_dp_aux_sync_len());
224
225 if (intel_tc_port_in_tbt_alt_mode(dig_port))
226 ret |= DP_AUX_CH_CTL_TBT_IO;
227
228 /*
229 * Power request bit is already set during aux power well enable.
230 * Preserve the bit across aux transactions.
231 */
232 if (DISPLAY_VER(display) >= 14)
233 ret |= XELPDP_DP_AUX_CH_CTL_POWER_REQUEST;
234
235 return ret;
236}
237
238static int
239intel_dp_aux_xfer(struct intel_dp *intel_dp,
240 const u8 *send, int send_bytes,
241 u8 *recv, int recv_size,
242 u32 aux_send_ctl_flags)
243{
244 struct intel_display *display = to_intel_display(intel_dp);
245 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
246 struct intel_encoder *encoder = &dig_port->base;
247 struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
248 i915_reg_t ch_ctl, ch_data[5];
249 u32 aux_clock_divider;
250 enum intel_display_power_domain aux_domain;
251 intel_wakeref_t aux_wakeref;
252 intel_wakeref_t pps_wakeref;
253 int i, ret, recv_bytes;
254 int try, clock = 0;
255 u32 status;
256 bool vdd;
257
258 ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
259 for (i = 0; i < ARRAY_SIZE(ch_data); i++)
260 ch_data[i] = intel_dp->aux_ch_data_reg(intel_dp, i);
261
262 intel_digital_port_lock(encoder);
263 /*
264 * Abort transfers on a disconnected port as required by
265 * DP 1.4a link CTS 4.2.1.5, also avoiding the long AUX
266 * timeouts that would otherwise happen.
267 */
268 if (!intel_dp_is_edp(intel_dp) &&
269 !intel_digital_port_connected_locked(&dig_port->base)) {
270 ret = -ENXIO;
271 goto out_unlock;
272 }
273
274 aux_domain = intel_aux_power_domain(dig_port);
275
276 aux_wakeref = intel_display_power_get(i915, aux_domain);
277 pps_wakeref = intel_pps_lock(intel_dp);
278
279 /*
280 * We will be called with VDD already enabled for dpcd/edid/oui reads.
281 * In such cases we want to leave VDD enabled and it's up to upper layers
282 * to turn it off. But for eg. i2c-dev access we need to turn it on/off
283 * ourselves.
284 */
285 vdd = intel_pps_vdd_on_unlocked(intel_dp);
286
287 /*
288 * dp aux is extremely sensitive to irq latency, hence request the
289 * lowest possible wakeup latency and so prevent the cpu from going into
290 * deep sleep states.
291 */
292 cpu_latency_qos_update_request(&intel_dp->pm_qos, 0);
293
294 intel_pps_check_power_unlocked(intel_dp);
295
296 /*
297 * FIXME PSR should be disabled here to prevent
298 * it using the same AUX CH simultaneously
299 */
300
301 /* Try to wait for any previous AUX channel activity */
302 for (try = 0; try < 3; try++) {
303 status = intel_de_read_notrace(display, ch_ctl);
304 if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
305 break;
306 msleep(1);
307 }
308 /* just trace the final value */
309 trace_i915_reg_rw(false, ch_ctl, status, sizeof(status), true);
310
311 if (try == 3) {
312 const u32 status = intel_de_read(display, ch_ctl);
313
314 if (status != intel_dp->aux_busy_last_status) {
315 drm_WARN(display->drm, 1,
316 "%s: not started (status 0x%08x)\n",
317 intel_dp->aux.name, status);
318 intel_dp->aux_busy_last_status = status;
319 }
320
321 ret = -EBUSY;
322 goto out;
323 }
324
325 /* Only 5 data registers! */
326 if (drm_WARN_ON(display->drm, send_bytes > 20 || recv_size > 20)) {
327 ret = -E2BIG;
328 goto out;
329 }
330
331 while ((aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, clock++))) {
332 u32 send_ctl = intel_dp->get_aux_send_ctl(intel_dp,
333 send_bytes,
334 aux_clock_divider);
335
336 send_ctl |= aux_send_ctl_flags;
337
338 /* Must try at least 3 times according to DP spec */
339 for (try = 0; try < 5; try++) {
340 /* Load the send data into the aux channel data registers */
341 for (i = 0; i < send_bytes; i += 4)
342 intel_de_write(display, ch_data[i >> 2],
343 intel_dp_aux_pack(send + i,
344 send_bytes - i));
345
346 /* Send the command and wait for it to complete */
347 intel_de_write(display, ch_ctl, send_ctl);
348
349 status = intel_dp_aux_wait_done(intel_dp);
350
351 /* Clear done status and any errors */
352 intel_de_write(display, ch_ctl,
353 status | DP_AUX_CH_CTL_DONE |
354 DP_AUX_CH_CTL_TIME_OUT_ERROR |
355 DP_AUX_CH_CTL_RECEIVE_ERROR);
356
357 /*
358 * DP CTS 1.2 Core Rev 1.1, 4.2.1.1 & 4.2.1.2
359 * 400us delay required for errors and timeouts
360 * Timeout errors from the HW already meet this
361 * requirement so skip to next iteration
362 */
363 if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR)
364 continue;
365
366 if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
367 usleep_range(400, 500);
368 continue;
369 }
370 if (status & DP_AUX_CH_CTL_DONE)
371 goto done;
372 }
373 }
374
375 if ((status & DP_AUX_CH_CTL_DONE) == 0) {
376 drm_err(display->drm, "%s: not done (status 0x%08x)\n",
377 intel_dp->aux.name, status);
378 ret = -EBUSY;
379 goto out;
380 }
381
382done:
383 /*
384 * Check for timeout or receive error. Timeouts occur when the sink is
385 * not connected.
386 */
387 if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
388 drm_err(display->drm, "%s: receive error (status 0x%08x)\n",
389 intel_dp->aux.name, status);
390 ret = -EIO;
391 goto out;
392 }
393
394 /*
395 * Timeouts occur when the device isn't connected, so they're "normal"
396 * -- don't fill the kernel log with these
397 */
398 if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
399 drm_dbg_kms(display->drm, "%s: timeout (status 0x%08x)\n",
400 intel_dp->aux.name, status);
401 ret = -ETIMEDOUT;
402 goto out;
403 }
404
405 /* Unload any bytes sent back from the other side */
406 recv_bytes = REG_FIELD_GET(DP_AUX_CH_CTL_MESSAGE_SIZE_MASK, status);
407
408 /*
409 * By BSpec: "Message sizes of 0 or >20 are not allowed."
410 * We have no idea of what happened so we return -EBUSY so
411 * drm layer takes care for the necessary retries.
412 */
413 if (recv_bytes == 0 || recv_bytes > 20) {
414 drm_dbg_kms(display->drm,
415 "%s: Forbidden recv_bytes = %d on aux transaction\n",
416 intel_dp->aux.name, recv_bytes);
417 ret = -EBUSY;
418 goto out;
419 }
420
421 if (recv_bytes > recv_size)
422 recv_bytes = recv_size;
423
424 for (i = 0; i < recv_bytes; i += 4)
425 intel_dp_aux_unpack(intel_de_read(display, ch_data[i >> 2]),
426 recv + i, recv_bytes - i);
427
428 ret = recv_bytes;
429out:
430 cpu_latency_qos_update_request(&intel_dp->pm_qos, PM_QOS_DEFAULT_VALUE);
431
432 if (vdd)
433 intel_pps_vdd_off_unlocked(intel_dp, false);
434
435 intel_pps_unlock(intel_dp, pps_wakeref);
436 intel_display_power_put_async(i915, aux_domain, aux_wakeref);
437out_unlock:
438 intel_digital_port_unlock(encoder);
439
440 return ret;
441}
442
443#define BARE_ADDRESS_SIZE 3
444#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
445
446static void
447intel_dp_aux_header(u8 txbuf[HEADER_SIZE],
448 const struct drm_dp_aux_msg *msg)
449{
450 txbuf[0] = (msg->request << 4) | ((msg->address >> 16) & 0xf);
451 txbuf[1] = (msg->address >> 8) & 0xff;
452 txbuf[2] = msg->address & 0xff;
453 txbuf[3] = msg->size - 1;
454}
455
456static u32 intel_dp_aux_xfer_flags(const struct drm_dp_aux_msg *msg)
457{
458 /*
459 * If we're trying to send the HDCP Aksv, we need to set a the Aksv
460 * select bit to inform the hardware to send the Aksv after our header
461 * since we can't access that data from software.
462 */
463 if ((msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_NATIVE_WRITE &&
464 msg->address == DP_AUX_HDCP_AKSV)
465 return DP_AUX_CH_CTL_AUX_AKSV_SELECT;
466
467 return 0;
468}
469
470static ssize_t
471intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
472{
473 struct intel_dp *intel_dp = container_of(aux, struct intel_dp, aux);
474 struct intel_display *display = to_intel_display(intel_dp);
475 u8 txbuf[20], rxbuf[20];
476 size_t txsize, rxsize;
477 u32 flags = intel_dp_aux_xfer_flags(msg);
478 int ret;
479
480 intel_dp_aux_header(txbuf, msg);
481
482 switch (msg->request & ~DP_AUX_I2C_MOT) {
483 case DP_AUX_NATIVE_WRITE:
484 case DP_AUX_I2C_WRITE:
485 case DP_AUX_I2C_WRITE_STATUS_UPDATE:
486 txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
487 rxsize = 2; /* 0 or 1 data bytes */
488
489 if (drm_WARN_ON(display->drm, txsize > 20))
490 return -E2BIG;
491
492 drm_WARN_ON(display->drm, !msg->buffer != !msg->size);
493
494 if (msg->buffer)
495 memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
496
497 ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
498 rxbuf, rxsize, flags);
499 if (ret > 0) {
500 msg->reply = rxbuf[0] >> 4;
501
502 if (ret > 1) {
503 /* Number of bytes written in a short write. */
504 ret = clamp_t(int, rxbuf[1], 0, msg->size);
505 } else {
506 /* Return payload size. */
507 ret = msg->size;
508 }
509 }
510 break;
511
512 case DP_AUX_NATIVE_READ:
513 case DP_AUX_I2C_READ:
514 txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE;
515 rxsize = msg->size + 1;
516
517 if (drm_WARN_ON(display->drm, rxsize > 20))
518 return -E2BIG;
519
520 ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
521 rxbuf, rxsize, flags);
522 if (ret > 0) {
523 msg->reply = rxbuf[0] >> 4;
524 /*
525 * Assume happy day, and copy the data. The caller is
526 * expected to check msg->reply before touching it.
527 *
528 * Return payload size.
529 */
530 ret--;
531 memcpy(msg->buffer, rxbuf + 1, ret);
532 }
533 break;
534
535 default:
536 ret = -EINVAL;
537 break;
538 }
539
540 return ret;
541}
542
543static i915_reg_t vlv_aux_ctl_reg(struct intel_dp *intel_dp)
544{
545 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
546 enum aux_ch aux_ch = dig_port->aux_ch;
547
548 switch (aux_ch) {
549 case AUX_CH_B:
550 case AUX_CH_C:
551 case AUX_CH_D:
552 return VLV_DP_AUX_CH_CTL(aux_ch);
553 default:
554 MISSING_CASE(aux_ch);
555 return VLV_DP_AUX_CH_CTL(AUX_CH_B);
556 }
557}
558
559static i915_reg_t vlv_aux_data_reg(struct intel_dp *intel_dp, int index)
560{
561 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
562 enum aux_ch aux_ch = dig_port->aux_ch;
563
564 switch (aux_ch) {
565 case AUX_CH_B:
566 case AUX_CH_C:
567 case AUX_CH_D:
568 return VLV_DP_AUX_CH_DATA(aux_ch, index);
569 default:
570 MISSING_CASE(aux_ch);
571 return VLV_DP_AUX_CH_DATA(AUX_CH_B, index);
572 }
573}
574
575static i915_reg_t g4x_aux_ctl_reg(struct intel_dp *intel_dp)
576{
577 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
578 enum aux_ch aux_ch = dig_port->aux_ch;
579
580 switch (aux_ch) {
581 case AUX_CH_B:
582 case AUX_CH_C:
583 case AUX_CH_D:
584 return DP_AUX_CH_CTL(aux_ch);
585 default:
586 MISSING_CASE(aux_ch);
587 return DP_AUX_CH_CTL(AUX_CH_B);
588 }
589}
590
591static i915_reg_t g4x_aux_data_reg(struct intel_dp *intel_dp, int index)
592{
593 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
594 enum aux_ch aux_ch = dig_port->aux_ch;
595
596 switch (aux_ch) {
597 case AUX_CH_B:
598 case AUX_CH_C:
599 case AUX_CH_D:
600 return DP_AUX_CH_DATA(aux_ch, index);
601 default:
602 MISSING_CASE(aux_ch);
603 return DP_AUX_CH_DATA(AUX_CH_B, index);
604 }
605}
606
607static i915_reg_t ilk_aux_ctl_reg(struct intel_dp *intel_dp)
608{
609 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
610 enum aux_ch aux_ch = dig_port->aux_ch;
611
612 switch (aux_ch) {
613 case AUX_CH_A:
614 return DP_AUX_CH_CTL(aux_ch);
615 case AUX_CH_B:
616 case AUX_CH_C:
617 case AUX_CH_D:
618 return PCH_DP_AUX_CH_CTL(aux_ch);
619 default:
620 MISSING_CASE(aux_ch);
621 return DP_AUX_CH_CTL(AUX_CH_A);
622 }
623}
624
625static i915_reg_t ilk_aux_data_reg(struct intel_dp *intel_dp, int index)
626{
627 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
628 enum aux_ch aux_ch = dig_port->aux_ch;
629
630 switch (aux_ch) {
631 case AUX_CH_A:
632 return DP_AUX_CH_DATA(aux_ch, index);
633 case AUX_CH_B:
634 case AUX_CH_C:
635 case AUX_CH_D:
636 return PCH_DP_AUX_CH_DATA(aux_ch, index);
637 default:
638 MISSING_CASE(aux_ch);
639 return DP_AUX_CH_DATA(AUX_CH_A, index);
640 }
641}
642
643static i915_reg_t skl_aux_ctl_reg(struct intel_dp *intel_dp)
644{
645 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
646 enum aux_ch aux_ch = dig_port->aux_ch;
647
648 switch (aux_ch) {
649 case AUX_CH_A:
650 case AUX_CH_B:
651 case AUX_CH_C:
652 case AUX_CH_D:
653 case AUX_CH_E:
654 case AUX_CH_F:
655 return DP_AUX_CH_CTL(aux_ch);
656 default:
657 MISSING_CASE(aux_ch);
658 return DP_AUX_CH_CTL(AUX_CH_A);
659 }
660}
661
662static i915_reg_t skl_aux_data_reg(struct intel_dp *intel_dp, int index)
663{
664 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
665 enum aux_ch aux_ch = dig_port->aux_ch;
666
667 switch (aux_ch) {
668 case AUX_CH_A:
669 case AUX_CH_B:
670 case AUX_CH_C:
671 case AUX_CH_D:
672 case AUX_CH_E:
673 case AUX_CH_F:
674 return DP_AUX_CH_DATA(aux_ch, index);
675 default:
676 MISSING_CASE(aux_ch);
677 return DP_AUX_CH_DATA(AUX_CH_A, index);
678 }
679}
680
681static i915_reg_t tgl_aux_ctl_reg(struct intel_dp *intel_dp)
682{
683 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
684 enum aux_ch aux_ch = dig_port->aux_ch;
685
686 switch (aux_ch) {
687 case AUX_CH_A:
688 case AUX_CH_B:
689 case AUX_CH_C:
690 case AUX_CH_USBC1:
691 case AUX_CH_USBC2:
692 case AUX_CH_USBC3:
693 case AUX_CH_USBC4:
694 case AUX_CH_USBC5: /* aka AUX_CH_D_XELPD */
695 case AUX_CH_USBC6: /* aka AUX_CH_E_XELPD */
696 return DP_AUX_CH_CTL(aux_ch);
697 default:
698 MISSING_CASE(aux_ch);
699 return DP_AUX_CH_CTL(AUX_CH_A);
700 }
701}
702
703static i915_reg_t tgl_aux_data_reg(struct intel_dp *intel_dp, int index)
704{
705 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
706 enum aux_ch aux_ch = dig_port->aux_ch;
707
708 switch (aux_ch) {
709 case AUX_CH_A:
710 case AUX_CH_B:
711 case AUX_CH_C:
712 case AUX_CH_USBC1:
713 case AUX_CH_USBC2:
714 case AUX_CH_USBC3:
715 case AUX_CH_USBC4:
716 case AUX_CH_USBC5: /* aka AUX_CH_D_XELPD */
717 case AUX_CH_USBC6: /* aka AUX_CH_E_XELPD */
718 return DP_AUX_CH_DATA(aux_ch, index);
719 default:
720 MISSING_CASE(aux_ch);
721 return DP_AUX_CH_DATA(AUX_CH_A, index);
722 }
723}
724
725static i915_reg_t xelpdp_aux_ctl_reg(struct intel_dp *intel_dp)
726{
727 struct intel_display *display = to_intel_display(intel_dp);
728 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
729 enum aux_ch aux_ch = dig_port->aux_ch;
730
731 switch (aux_ch) {
732 case AUX_CH_A:
733 case AUX_CH_B:
734 case AUX_CH_USBC1:
735 case AUX_CH_USBC2:
736 case AUX_CH_USBC3:
737 case AUX_CH_USBC4:
738 return XELPDP_DP_AUX_CH_CTL(display, aux_ch);
739 default:
740 MISSING_CASE(aux_ch);
741 return XELPDP_DP_AUX_CH_CTL(display, AUX_CH_A);
742 }
743}
744
745static i915_reg_t xelpdp_aux_data_reg(struct intel_dp *intel_dp, int index)
746{
747 struct intel_display *display = to_intel_display(intel_dp);
748 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
749 enum aux_ch aux_ch = dig_port->aux_ch;
750
751 switch (aux_ch) {
752 case AUX_CH_A:
753 case AUX_CH_B:
754 case AUX_CH_USBC1:
755 case AUX_CH_USBC2:
756 case AUX_CH_USBC3:
757 case AUX_CH_USBC4:
758 return XELPDP_DP_AUX_CH_DATA(display, aux_ch, index);
759 default:
760 MISSING_CASE(aux_ch);
761 return XELPDP_DP_AUX_CH_DATA(display, AUX_CH_A, index);
762 }
763}
764
765void intel_dp_aux_fini(struct intel_dp *intel_dp)
766{
767 if (cpu_latency_qos_request_active(&intel_dp->pm_qos))
768 cpu_latency_qos_remove_request(&intel_dp->pm_qos);
769
770 kfree(intel_dp->aux.name);
771}
772
773void intel_dp_aux_init(struct intel_dp *intel_dp)
774{
775 struct intel_display *display = to_intel_display(intel_dp);
776 struct drm_i915_private *i915 = to_i915(display->drm);
777 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
778 struct intel_encoder *encoder = &dig_port->base;
779 enum aux_ch aux_ch = dig_port->aux_ch;
780 char buf[AUX_CH_NAME_BUFSIZE];
781
782 if (DISPLAY_VER(display) >= 14) {
783 intel_dp->aux_ch_ctl_reg = xelpdp_aux_ctl_reg;
784 intel_dp->aux_ch_data_reg = xelpdp_aux_data_reg;
785 } else if (DISPLAY_VER(display) >= 12) {
786 intel_dp->aux_ch_ctl_reg = tgl_aux_ctl_reg;
787 intel_dp->aux_ch_data_reg = tgl_aux_data_reg;
788 } else if (DISPLAY_VER(display) >= 9) {
789 intel_dp->aux_ch_ctl_reg = skl_aux_ctl_reg;
790 intel_dp->aux_ch_data_reg = skl_aux_data_reg;
791 } else if (HAS_PCH_SPLIT(i915)) {
792 intel_dp->aux_ch_ctl_reg = ilk_aux_ctl_reg;
793 intel_dp->aux_ch_data_reg = ilk_aux_data_reg;
794 } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
795 intel_dp->aux_ch_ctl_reg = vlv_aux_ctl_reg;
796 intel_dp->aux_ch_data_reg = vlv_aux_data_reg;
797 } else {
798 intel_dp->aux_ch_ctl_reg = g4x_aux_ctl_reg;
799 intel_dp->aux_ch_data_reg = g4x_aux_data_reg;
800 }
801
802 if (DISPLAY_VER(display) >= 9)
803 intel_dp->get_aux_clock_divider = skl_get_aux_clock_divider;
804 else if (IS_BROADWELL(i915) || IS_HASWELL(i915))
805 intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider;
806 else if (HAS_PCH_SPLIT(i915))
807 intel_dp->get_aux_clock_divider = ilk_get_aux_clock_divider;
808 else
809 intel_dp->get_aux_clock_divider = g4x_get_aux_clock_divider;
810
811 if (DISPLAY_VER(display) >= 9)
812 intel_dp->get_aux_send_ctl = skl_get_aux_send_ctl;
813 else
814 intel_dp->get_aux_send_ctl = g4x_get_aux_send_ctl;
815
816 intel_dp->aux.drm_dev = display->drm;
817 drm_dp_aux_init(&intel_dp->aux);
818
819 /* Failure to allocate our preferred name is not critical */
820 intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX %s/%s",
821 aux_ch_name(display, buf, sizeof(buf), aux_ch),
822 encoder->base.name);
823
824 intel_dp->aux.transfer = intel_dp_aux_transfer;
825 cpu_latency_qos_add_request(&intel_dp->pm_qos, PM_QOS_DEFAULT_VALUE);
826}
827
828static enum aux_ch default_aux_ch(struct intel_encoder *encoder)
829{
830 struct intel_display *display = to_intel_display(encoder);
831
832 /* SKL has DDI E but no AUX E */
833 if (DISPLAY_VER(display) == 9 && encoder->port == PORT_E)
834 return AUX_CH_A;
835
836 return (enum aux_ch)encoder->port;
837}
838
839static struct intel_encoder *
840get_encoder_by_aux_ch(struct intel_encoder *encoder,
841 enum aux_ch aux_ch)
842{
843 struct intel_display *display = to_intel_display(encoder);
844 struct intel_encoder *other;
845
846 for_each_intel_encoder(display->drm, other) {
847 if (other == encoder)
848 continue;
849
850 if (!intel_encoder_is_dig_port(other))
851 continue;
852
853 if (enc_to_dig_port(other)->aux_ch == aux_ch)
854 return other;
855 }
856
857 return NULL;
858}
859
860enum aux_ch intel_dp_aux_ch(struct intel_encoder *encoder)
861{
862 struct intel_display *display = to_intel_display(encoder);
863 struct intel_encoder *other;
864 const char *source;
865 enum aux_ch aux_ch;
866 char buf[AUX_CH_NAME_BUFSIZE];
867
868 aux_ch = intel_bios_dp_aux_ch(encoder->devdata);
869 source = "VBT";
870
871 if (aux_ch == AUX_CH_NONE) {
872 aux_ch = default_aux_ch(encoder);
873 source = "platform default";
874 }
875
876 if (aux_ch == AUX_CH_NONE)
877 return AUX_CH_NONE;
878
879 /* FIXME validate aux_ch against platform caps */
880
881 other = get_encoder_by_aux_ch(encoder, aux_ch);
882 if (other) {
883 drm_dbg_kms(display->drm,
884 "[ENCODER:%d:%s] AUX CH %s already claimed by [ENCODER:%d:%s]\n",
885 encoder->base.base.id, encoder->base.name,
886 aux_ch_name(display, buf, sizeof(buf), aux_ch),
887 other->base.base.id, other->base.name);
888 return AUX_CH_NONE;
889 }
890
891 drm_dbg_kms(display->drm,
892 "[ENCODER:%d:%s] Using AUX CH %s (%s)\n",
893 encoder->base.base.id, encoder->base.name,
894 aux_ch_name(display, buf, sizeof(buf), aux_ch), source);
895
896 return aux_ch;
897}
898
899void intel_dp_aux_irq_handler(struct intel_display *display)
900{
901 wake_up_all(&display->gmbus.wait_queue);
902}
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2020-2021 Intel Corporation
4 */
5
6#include "i915_drv.h"
7#include "i915_reg.h"
8#include "i915_trace.h"
9#include "intel_display_types.h"
10#include "intel_dp_aux.h"
11#include "intel_pps.h"
12#include "intel_tc.h"
13
14static u32 intel_dp_aux_pack(const u8 *src, int src_bytes)
15{
16 int i;
17 u32 v = 0;
18
19 if (src_bytes > 4)
20 src_bytes = 4;
21 for (i = 0; i < src_bytes; i++)
22 v |= ((u32)src[i]) << ((3 - i) * 8);
23 return v;
24}
25
26static void intel_dp_aux_unpack(u32 src, u8 *dst, int dst_bytes)
27{
28 int i;
29
30 if (dst_bytes > 4)
31 dst_bytes = 4;
32 for (i = 0; i < dst_bytes; i++)
33 dst[i] = src >> ((3 - i) * 8);
34}
35
36static u32
37intel_dp_aux_wait_done(struct intel_dp *intel_dp)
38{
39 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
40 i915_reg_t ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
41 const unsigned int timeout_ms = 10;
42 u32 status;
43 bool done;
44
45#define C (((status = intel_uncore_read_notrace(&i915->uncore, ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)
46 done = wait_event_timeout(i915->display.gmbus.wait_queue, C,
47 msecs_to_jiffies_timeout(timeout_ms));
48
49 /* just trace the final value */
50 trace_i915_reg_rw(false, ch_ctl, status, sizeof(status), true);
51
52 if (!done)
53 drm_err(&i915->drm,
54 "%s: did not complete or timeout within %ums (status 0x%08x)\n",
55 intel_dp->aux.name, timeout_ms, status);
56#undef C
57
58 return status;
59}
60
61static u32 g4x_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
62{
63 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
64
65 if (index)
66 return 0;
67
68 /*
69 * The clock divider is based off the hrawclk, and would like to run at
70 * 2MHz. So, take the hrawclk value and divide by 2000 and use that
71 */
72 return DIV_ROUND_CLOSEST(RUNTIME_INFO(dev_priv)->rawclk_freq, 2000);
73}
74
75static u32 ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
76{
77 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
78 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
79 u32 freq;
80
81 if (index)
82 return 0;
83
84 /*
85 * The clock divider is based off the cdclk or PCH rawclk, and would
86 * like to run at 2MHz. So, take the cdclk or PCH rawclk value and
87 * divide by 2000 and use that
88 */
89 if (dig_port->aux_ch == AUX_CH_A)
90 freq = dev_priv->display.cdclk.hw.cdclk;
91 else
92 freq = RUNTIME_INFO(dev_priv)->rawclk_freq;
93 return DIV_ROUND_CLOSEST(freq, 2000);
94}
95
96static u32 hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
97{
98 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
99 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
100
101 if (dig_port->aux_ch != AUX_CH_A && HAS_PCH_LPT_H(dev_priv)) {
102 /* Workaround for non-ULT HSW */
103 switch (index) {
104 case 0: return 63;
105 case 1: return 72;
106 default: return 0;
107 }
108 }
109
110 return ilk_get_aux_clock_divider(intel_dp, index);
111}
112
113static u32 skl_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
114{
115 /*
116 * SKL doesn't need us to program the AUX clock divider (Hardware will
117 * derive the clock from CDCLK automatically). We still implement the
118 * get_aux_clock_divider vfunc to plug-in into the existing code.
119 */
120 return index ? 0 : 1;
121}
122
123static u32 g4x_get_aux_send_ctl(struct intel_dp *intel_dp,
124 int send_bytes,
125 u32 aux_clock_divider)
126{
127 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
128 struct drm_i915_private *dev_priv =
129 to_i915(dig_port->base.base.dev);
130 u32 timeout;
131
132 /* Max timeout value on G4x-BDW: 1.6ms */
133 if (IS_BROADWELL(dev_priv))
134 timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
135 else
136 timeout = DP_AUX_CH_CTL_TIME_OUT_400us;
137
138 return DP_AUX_CH_CTL_SEND_BUSY |
139 DP_AUX_CH_CTL_DONE |
140 DP_AUX_CH_CTL_INTERRUPT |
141 DP_AUX_CH_CTL_TIME_OUT_ERROR |
142 timeout |
143 DP_AUX_CH_CTL_RECEIVE_ERROR |
144 (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
145 (3 << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
146 (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT);
147}
148
149static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp,
150 int send_bytes,
151 u32 unused)
152{
153 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
154 struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
155 u32 ret;
156
157 /*
158 * Max timeout values:
159 * SKL-GLK: 1.6ms
160 * ICL+: 4ms
161 */
162 ret = DP_AUX_CH_CTL_SEND_BUSY |
163 DP_AUX_CH_CTL_DONE |
164 DP_AUX_CH_CTL_INTERRUPT |
165 DP_AUX_CH_CTL_TIME_OUT_ERROR |
166 DP_AUX_CH_CTL_TIME_OUT_MAX |
167 DP_AUX_CH_CTL_RECEIVE_ERROR |
168 (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
169 DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(32) |
170 DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
171
172 if (intel_tc_port_in_tbt_alt_mode(dig_port))
173 ret |= DP_AUX_CH_CTL_TBT_IO;
174
175 /*
176 * Power request bit is already set during aux power well enable.
177 * Preserve the bit across aux transactions.
178 */
179 if (DISPLAY_VER(i915) >= 14)
180 ret |= XELPDP_DP_AUX_CH_CTL_POWER_REQUEST;
181
182 return ret;
183}
184
185static int
186intel_dp_aux_xfer(struct intel_dp *intel_dp,
187 const u8 *send, int send_bytes,
188 u8 *recv, int recv_size,
189 u32 aux_send_ctl_flags)
190{
191 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
192 struct drm_i915_private *i915 =
193 to_i915(dig_port->base.base.dev);
194 struct intel_uncore *uncore = &i915->uncore;
195 enum phy phy = intel_port_to_phy(i915, dig_port->base.port);
196 bool is_tc_port = intel_phy_is_tc(i915, phy);
197 i915_reg_t ch_ctl, ch_data[5];
198 u32 aux_clock_divider;
199 enum intel_display_power_domain aux_domain;
200 intel_wakeref_t aux_wakeref;
201 intel_wakeref_t pps_wakeref;
202 int i, ret, recv_bytes;
203 int try, clock = 0;
204 u32 status;
205 bool vdd;
206
207 ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
208 for (i = 0; i < ARRAY_SIZE(ch_data); i++)
209 ch_data[i] = intel_dp->aux_ch_data_reg(intel_dp, i);
210
211 if (is_tc_port)
212 intel_tc_port_lock(dig_port);
213
214 aux_domain = intel_aux_power_domain(dig_port);
215
216 aux_wakeref = intel_display_power_get(i915, aux_domain);
217 pps_wakeref = intel_pps_lock(intel_dp);
218
219 /*
220 * We will be called with VDD already enabled for dpcd/edid/oui reads.
221 * In such cases we want to leave VDD enabled and it's up to upper layers
222 * to turn it off. But for eg. i2c-dev access we need to turn it on/off
223 * ourselves.
224 */
225 vdd = intel_pps_vdd_on_unlocked(intel_dp);
226
227 /*
228 * dp aux is extremely sensitive to irq latency, hence request the
229 * lowest possible wakeup latency and so prevent the cpu from going into
230 * deep sleep states.
231 */
232 cpu_latency_qos_update_request(&intel_dp->pm_qos, 0);
233
234 intel_pps_check_power_unlocked(intel_dp);
235
236 /* Try to wait for any previous AUX channel activity */
237 for (try = 0; try < 3; try++) {
238 status = intel_uncore_read_notrace(uncore, ch_ctl);
239 if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
240 break;
241 msleep(1);
242 }
243 /* just trace the final value */
244 trace_i915_reg_rw(false, ch_ctl, status, sizeof(status), true);
245
246 if (try == 3) {
247 const u32 status = intel_uncore_read(uncore, ch_ctl);
248
249 if (status != intel_dp->aux_busy_last_status) {
250 drm_WARN(&i915->drm, 1,
251 "%s: not started (status 0x%08x)\n",
252 intel_dp->aux.name, status);
253 intel_dp->aux_busy_last_status = status;
254 }
255
256 ret = -EBUSY;
257 goto out;
258 }
259
260 /* Only 5 data registers! */
261 if (drm_WARN_ON(&i915->drm, send_bytes > 20 || recv_size > 20)) {
262 ret = -E2BIG;
263 goto out;
264 }
265
266 while ((aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, clock++))) {
267 u32 send_ctl = intel_dp->get_aux_send_ctl(intel_dp,
268 send_bytes,
269 aux_clock_divider);
270
271 send_ctl |= aux_send_ctl_flags;
272
273 /* Must try at least 3 times according to DP spec */
274 for (try = 0; try < 5; try++) {
275 /* Load the send data into the aux channel data registers */
276 for (i = 0; i < send_bytes; i += 4)
277 intel_uncore_write(uncore,
278 ch_data[i >> 2],
279 intel_dp_aux_pack(send + i,
280 send_bytes - i));
281
282 /* Send the command and wait for it to complete */
283 intel_uncore_write(uncore, ch_ctl, send_ctl);
284
285 status = intel_dp_aux_wait_done(intel_dp);
286
287 /* Clear done status and any errors */
288 intel_uncore_write(uncore,
289 ch_ctl,
290 status |
291 DP_AUX_CH_CTL_DONE |
292 DP_AUX_CH_CTL_TIME_OUT_ERROR |
293 DP_AUX_CH_CTL_RECEIVE_ERROR);
294
295 /*
296 * DP CTS 1.2 Core Rev 1.1, 4.2.1.1 & 4.2.1.2
297 * 400us delay required for errors and timeouts
298 * Timeout errors from the HW already meet this
299 * requirement so skip to next iteration
300 */
301 if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR)
302 continue;
303
304 if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
305 usleep_range(400, 500);
306 continue;
307 }
308 if (status & DP_AUX_CH_CTL_DONE)
309 goto done;
310 }
311 }
312
313 if ((status & DP_AUX_CH_CTL_DONE) == 0) {
314 drm_err(&i915->drm, "%s: not done (status 0x%08x)\n",
315 intel_dp->aux.name, status);
316 ret = -EBUSY;
317 goto out;
318 }
319
320done:
321 /*
322 * Check for timeout or receive error. Timeouts occur when the sink is
323 * not connected.
324 */
325 if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
326 drm_err(&i915->drm, "%s: receive error (status 0x%08x)\n",
327 intel_dp->aux.name, status);
328 ret = -EIO;
329 goto out;
330 }
331
332 /*
333 * Timeouts occur when the device isn't connected, so they're "normal"
334 * -- don't fill the kernel log with these
335 */
336 if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
337 drm_dbg_kms(&i915->drm, "%s: timeout (status 0x%08x)\n",
338 intel_dp->aux.name, status);
339 ret = -ETIMEDOUT;
340 goto out;
341 }
342
343 /* Unload any bytes sent back from the other side */
344 recv_bytes = ((status & DP_AUX_CH_CTL_MESSAGE_SIZE_MASK) >>
345 DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
346
347 /*
348 * By BSpec: "Message sizes of 0 or >20 are not allowed."
349 * We have no idea of what happened so we return -EBUSY so
350 * drm layer takes care for the necessary retries.
351 */
352 if (recv_bytes == 0 || recv_bytes > 20) {
353 drm_dbg_kms(&i915->drm,
354 "%s: Forbidden recv_bytes = %d on aux transaction\n",
355 intel_dp->aux.name, recv_bytes);
356 ret = -EBUSY;
357 goto out;
358 }
359
360 if (recv_bytes > recv_size)
361 recv_bytes = recv_size;
362
363 for (i = 0; i < recv_bytes; i += 4)
364 intel_dp_aux_unpack(intel_uncore_read(uncore, ch_data[i >> 2]),
365 recv + i, recv_bytes - i);
366
367 ret = recv_bytes;
368out:
369 cpu_latency_qos_update_request(&intel_dp->pm_qos, PM_QOS_DEFAULT_VALUE);
370
371 if (vdd)
372 intel_pps_vdd_off_unlocked(intel_dp, false);
373
374 intel_pps_unlock(intel_dp, pps_wakeref);
375 intel_display_power_put_async(i915, aux_domain, aux_wakeref);
376
377 if (is_tc_port)
378 intel_tc_port_unlock(dig_port);
379
380 return ret;
381}
382
383#define BARE_ADDRESS_SIZE 3
384#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
385
386static void
387intel_dp_aux_header(u8 txbuf[HEADER_SIZE],
388 const struct drm_dp_aux_msg *msg)
389{
390 txbuf[0] = (msg->request << 4) | ((msg->address >> 16) & 0xf);
391 txbuf[1] = (msg->address >> 8) & 0xff;
392 txbuf[2] = msg->address & 0xff;
393 txbuf[3] = msg->size - 1;
394}
395
396static u32 intel_dp_aux_xfer_flags(const struct drm_dp_aux_msg *msg)
397{
398 /*
399 * If we're trying to send the HDCP Aksv, we need to set a the Aksv
400 * select bit to inform the hardware to send the Aksv after our header
401 * since we can't access that data from software.
402 */
403 if ((msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_NATIVE_WRITE &&
404 msg->address == DP_AUX_HDCP_AKSV)
405 return DP_AUX_CH_CTL_AUX_AKSV_SELECT;
406
407 return 0;
408}
409
410static ssize_t
411intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
412{
413 struct intel_dp *intel_dp = container_of(aux, struct intel_dp, aux);
414 struct drm_i915_private *i915 = dp_to_i915(intel_dp);
415 u8 txbuf[20], rxbuf[20];
416 size_t txsize, rxsize;
417 u32 flags = intel_dp_aux_xfer_flags(msg);
418 int ret;
419
420 intel_dp_aux_header(txbuf, msg);
421
422 switch (msg->request & ~DP_AUX_I2C_MOT) {
423 case DP_AUX_NATIVE_WRITE:
424 case DP_AUX_I2C_WRITE:
425 case DP_AUX_I2C_WRITE_STATUS_UPDATE:
426 txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
427 rxsize = 2; /* 0 or 1 data bytes */
428
429 if (drm_WARN_ON(&i915->drm, txsize > 20))
430 return -E2BIG;
431
432 drm_WARN_ON(&i915->drm, !msg->buffer != !msg->size);
433
434 if (msg->buffer)
435 memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
436
437 ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
438 rxbuf, rxsize, flags);
439 if (ret > 0) {
440 msg->reply = rxbuf[0] >> 4;
441
442 if (ret > 1) {
443 /* Number of bytes written in a short write. */
444 ret = clamp_t(int, rxbuf[1], 0, msg->size);
445 } else {
446 /* Return payload size. */
447 ret = msg->size;
448 }
449 }
450 break;
451
452 case DP_AUX_NATIVE_READ:
453 case DP_AUX_I2C_READ:
454 txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE;
455 rxsize = msg->size + 1;
456
457 if (drm_WARN_ON(&i915->drm, rxsize > 20))
458 return -E2BIG;
459
460 ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
461 rxbuf, rxsize, flags);
462 if (ret > 0) {
463 msg->reply = rxbuf[0] >> 4;
464 /*
465 * Assume happy day, and copy the data. The caller is
466 * expected to check msg->reply before touching it.
467 *
468 * Return payload size.
469 */
470 ret--;
471 memcpy(msg->buffer, rxbuf + 1, ret);
472 }
473 break;
474
475 default:
476 ret = -EINVAL;
477 break;
478 }
479
480 return ret;
481}
482
483static i915_reg_t g4x_aux_ctl_reg(struct intel_dp *intel_dp)
484{
485 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
486 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
487 enum aux_ch aux_ch = dig_port->aux_ch;
488
489 switch (aux_ch) {
490 case AUX_CH_B:
491 case AUX_CH_C:
492 case AUX_CH_D:
493 return DP_AUX_CH_CTL(aux_ch);
494 default:
495 MISSING_CASE(aux_ch);
496 return DP_AUX_CH_CTL(AUX_CH_B);
497 }
498}
499
500static i915_reg_t g4x_aux_data_reg(struct intel_dp *intel_dp, int index)
501{
502 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
503 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
504 enum aux_ch aux_ch = dig_port->aux_ch;
505
506 switch (aux_ch) {
507 case AUX_CH_B:
508 case AUX_CH_C:
509 case AUX_CH_D:
510 return DP_AUX_CH_DATA(aux_ch, index);
511 default:
512 MISSING_CASE(aux_ch);
513 return DP_AUX_CH_DATA(AUX_CH_B, index);
514 }
515}
516
517static i915_reg_t ilk_aux_ctl_reg(struct intel_dp *intel_dp)
518{
519 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
520 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
521 enum aux_ch aux_ch = dig_port->aux_ch;
522
523 switch (aux_ch) {
524 case AUX_CH_A:
525 return DP_AUX_CH_CTL(aux_ch);
526 case AUX_CH_B:
527 case AUX_CH_C:
528 case AUX_CH_D:
529 return PCH_DP_AUX_CH_CTL(aux_ch);
530 default:
531 MISSING_CASE(aux_ch);
532 return DP_AUX_CH_CTL(AUX_CH_A);
533 }
534}
535
536static i915_reg_t ilk_aux_data_reg(struct intel_dp *intel_dp, int index)
537{
538 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
539 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
540 enum aux_ch aux_ch = dig_port->aux_ch;
541
542 switch (aux_ch) {
543 case AUX_CH_A:
544 return DP_AUX_CH_DATA(aux_ch, index);
545 case AUX_CH_B:
546 case AUX_CH_C:
547 case AUX_CH_D:
548 return PCH_DP_AUX_CH_DATA(aux_ch, index);
549 default:
550 MISSING_CASE(aux_ch);
551 return DP_AUX_CH_DATA(AUX_CH_A, index);
552 }
553}
554
555static i915_reg_t skl_aux_ctl_reg(struct intel_dp *intel_dp)
556{
557 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
558 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
559 enum aux_ch aux_ch = dig_port->aux_ch;
560
561 switch (aux_ch) {
562 case AUX_CH_A:
563 case AUX_CH_B:
564 case AUX_CH_C:
565 case AUX_CH_D:
566 case AUX_CH_E:
567 case AUX_CH_F:
568 return DP_AUX_CH_CTL(aux_ch);
569 default:
570 MISSING_CASE(aux_ch);
571 return DP_AUX_CH_CTL(AUX_CH_A);
572 }
573}
574
575static i915_reg_t skl_aux_data_reg(struct intel_dp *intel_dp, int index)
576{
577 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
578 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
579 enum aux_ch aux_ch = dig_port->aux_ch;
580
581 switch (aux_ch) {
582 case AUX_CH_A:
583 case AUX_CH_B:
584 case AUX_CH_C:
585 case AUX_CH_D:
586 case AUX_CH_E:
587 case AUX_CH_F:
588 return DP_AUX_CH_DATA(aux_ch, index);
589 default:
590 MISSING_CASE(aux_ch);
591 return DP_AUX_CH_DATA(AUX_CH_A, index);
592 }
593}
594
595static i915_reg_t tgl_aux_ctl_reg(struct intel_dp *intel_dp)
596{
597 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
598 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
599 enum aux_ch aux_ch = dig_port->aux_ch;
600
601 switch (aux_ch) {
602 case AUX_CH_A:
603 case AUX_CH_B:
604 case AUX_CH_C:
605 case AUX_CH_USBC1:
606 case AUX_CH_USBC2:
607 case AUX_CH_USBC3:
608 case AUX_CH_USBC4:
609 case AUX_CH_USBC5: /* aka AUX_CH_D_XELPD */
610 case AUX_CH_USBC6: /* aka AUX_CH_E_XELPD */
611 return DP_AUX_CH_CTL(aux_ch);
612 default:
613 MISSING_CASE(aux_ch);
614 return DP_AUX_CH_CTL(AUX_CH_A);
615 }
616}
617
618static i915_reg_t tgl_aux_data_reg(struct intel_dp *intel_dp, int index)
619{
620 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
621 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
622 enum aux_ch aux_ch = dig_port->aux_ch;
623
624 switch (aux_ch) {
625 case AUX_CH_A:
626 case AUX_CH_B:
627 case AUX_CH_C:
628 case AUX_CH_USBC1:
629 case AUX_CH_USBC2:
630 case AUX_CH_USBC3:
631 case AUX_CH_USBC4:
632 case AUX_CH_USBC5: /* aka AUX_CH_D_XELPD */
633 case AUX_CH_USBC6: /* aka AUX_CH_E_XELPD */
634 return DP_AUX_CH_DATA(aux_ch, index);
635 default:
636 MISSING_CASE(aux_ch);
637 return DP_AUX_CH_DATA(AUX_CH_A, index);
638 }
639}
640
641static i915_reg_t xelpdp_aux_ctl_reg(struct intel_dp *intel_dp)
642{
643 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
644 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
645 enum aux_ch aux_ch = dig_port->aux_ch;
646
647 switch (aux_ch) {
648 case AUX_CH_A:
649 case AUX_CH_B:
650 case AUX_CH_USBC1:
651 case AUX_CH_USBC2:
652 case AUX_CH_USBC3:
653 case AUX_CH_USBC4:
654 return XELPDP_DP_AUX_CH_CTL(aux_ch);
655 default:
656 MISSING_CASE(aux_ch);
657 return XELPDP_DP_AUX_CH_CTL(AUX_CH_A);
658 }
659}
660
661static i915_reg_t xelpdp_aux_data_reg(struct intel_dp *intel_dp, int index)
662{
663 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
664 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
665 enum aux_ch aux_ch = dig_port->aux_ch;
666
667 switch (aux_ch) {
668 case AUX_CH_A:
669 case AUX_CH_B:
670 case AUX_CH_USBC1:
671 case AUX_CH_USBC2:
672 case AUX_CH_USBC3:
673 case AUX_CH_USBC4:
674 return XELPDP_DP_AUX_CH_DATA(aux_ch, index);
675 default:
676 MISSING_CASE(aux_ch);
677 return XELPDP_DP_AUX_CH_DATA(AUX_CH_A, index);
678 }
679}
680
681void intel_dp_aux_fini(struct intel_dp *intel_dp)
682{
683 if (cpu_latency_qos_request_active(&intel_dp->pm_qos))
684 cpu_latency_qos_remove_request(&intel_dp->pm_qos);
685
686 kfree(intel_dp->aux.name);
687}
688
689void intel_dp_aux_init(struct intel_dp *intel_dp)
690{
691 struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
692 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
693 struct intel_encoder *encoder = &dig_port->base;
694 enum aux_ch aux_ch = dig_port->aux_ch;
695
696 if (DISPLAY_VER(dev_priv) >= 14) {
697 intel_dp->aux_ch_ctl_reg = xelpdp_aux_ctl_reg;
698 intel_dp->aux_ch_data_reg = xelpdp_aux_data_reg;
699 } else if (DISPLAY_VER(dev_priv) >= 12) {
700 intel_dp->aux_ch_ctl_reg = tgl_aux_ctl_reg;
701 intel_dp->aux_ch_data_reg = tgl_aux_data_reg;
702 } else if (DISPLAY_VER(dev_priv) >= 9) {
703 intel_dp->aux_ch_ctl_reg = skl_aux_ctl_reg;
704 intel_dp->aux_ch_data_reg = skl_aux_data_reg;
705 } else if (HAS_PCH_SPLIT(dev_priv)) {
706 intel_dp->aux_ch_ctl_reg = ilk_aux_ctl_reg;
707 intel_dp->aux_ch_data_reg = ilk_aux_data_reg;
708 } else {
709 intel_dp->aux_ch_ctl_reg = g4x_aux_ctl_reg;
710 intel_dp->aux_ch_data_reg = g4x_aux_data_reg;
711 }
712
713 if (DISPLAY_VER(dev_priv) >= 9)
714 intel_dp->get_aux_clock_divider = skl_get_aux_clock_divider;
715 else if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
716 intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider;
717 else if (HAS_PCH_SPLIT(dev_priv))
718 intel_dp->get_aux_clock_divider = ilk_get_aux_clock_divider;
719 else
720 intel_dp->get_aux_clock_divider = g4x_get_aux_clock_divider;
721
722 if (DISPLAY_VER(dev_priv) >= 9)
723 intel_dp->get_aux_send_ctl = skl_get_aux_send_ctl;
724 else
725 intel_dp->get_aux_send_ctl = g4x_get_aux_send_ctl;
726
727 intel_dp->aux.drm_dev = &dev_priv->drm;
728 drm_dp_aux_init(&intel_dp->aux);
729
730 /* Failure to allocate our preferred name is not critical */
731 if (DISPLAY_VER(dev_priv) >= 13 && aux_ch >= AUX_CH_D_XELPD)
732 intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX %c/%s",
733 aux_ch_name(aux_ch - AUX_CH_D_XELPD + AUX_CH_D),
734 encoder->base.name);
735 else if (DISPLAY_VER(dev_priv) >= 12 && aux_ch >= AUX_CH_USBC1)
736 intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX USBC%c/%s",
737 aux_ch - AUX_CH_USBC1 + '1',
738 encoder->base.name);
739 else
740 intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX %c/%s",
741 aux_ch_name(aux_ch),
742 encoder->base.name);
743
744 intel_dp->aux.transfer = intel_dp_aux_transfer;
745 cpu_latency_qos_add_request(&intel_dp->pm_qos, PM_QOS_DEFAULT_VALUE);
746}