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1/*
2 * Copyright (C) 2013 NVIDIA Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/clk.h>
10#include <linux/debugfs.h>
11#include <linux/host1x.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/of_platform.h>
15#include <linux/platform_device.h>
16#include <linux/reset.h>
17
18#include <linux/regulator/consumer.h>
19
20#include <drm/drm_atomic_helper.h>
21#include <drm/drm_mipi_dsi.h>
22#include <drm/drm_panel.h>
23
24#include <video/mipi_display.h>
25
26#include "dc.h"
27#include "drm.h"
28#include "dsi.h"
29#include "mipi-phy.h"
30
31struct tegra_dsi_state {
32 struct drm_connector_state base;
33
34 struct mipi_dphy_timing timing;
35 unsigned long period;
36
37 unsigned int vrefresh;
38 unsigned int lanes;
39 unsigned long pclk;
40 unsigned long bclk;
41
42 enum tegra_dsi_format format;
43 unsigned int mul;
44 unsigned int div;
45};
46
47static inline struct tegra_dsi_state *
48to_dsi_state(struct drm_connector_state *state)
49{
50 return container_of(state, struct tegra_dsi_state, base);
51}
52
53struct tegra_dsi {
54 struct host1x_client client;
55 struct tegra_output output;
56 struct device *dev;
57
58 void __iomem *regs;
59
60 struct reset_control *rst;
61 struct clk *clk_parent;
62 struct clk *clk_lp;
63 struct clk *clk;
64
65 struct drm_info_list *debugfs_files;
66 struct drm_minor *minor;
67 struct dentry *debugfs;
68
69 unsigned long flags;
70 enum mipi_dsi_pixel_format format;
71 unsigned int lanes;
72
73 struct tegra_mipi_device *mipi;
74 struct mipi_dsi_host host;
75
76 struct regulator *vdd;
77
78 unsigned int video_fifo_depth;
79 unsigned int host_fifo_depth;
80
81 /* for ganged-mode support */
82 struct tegra_dsi *master;
83 struct tegra_dsi *slave;
84};
85
86static inline struct tegra_dsi *
87host1x_client_to_dsi(struct host1x_client *client)
88{
89 return container_of(client, struct tegra_dsi, client);
90}
91
92static inline struct tegra_dsi *host_to_tegra(struct mipi_dsi_host *host)
93{
94 return container_of(host, struct tegra_dsi, host);
95}
96
97static inline struct tegra_dsi *to_dsi(struct tegra_output *output)
98{
99 return container_of(output, struct tegra_dsi, output);
100}
101
102static struct tegra_dsi_state *tegra_dsi_get_state(struct tegra_dsi *dsi)
103{
104 return to_dsi_state(dsi->output.connector.state);
105}
106
107static inline u32 tegra_dsi_readl(struct tegra_dsi *dsi, unsigned long reg)
108{
109 return readl(dsi->regs + (reg << 2));
110}
111
112static inline void tegra_dsi_writel(struct tegra_dsi *dsi, u32 value,
113 unsigned long reg)
114{
115 writel(value, dsi->regs + (reg << 2));
116}
117
118static int tegra_dsi_show_regs(struct seq_file *s, void *data)
119{
120 struct drm_info_node *node = s->private;
121 struct tegra_dsi *dsi = node->info_ent->data;
122 struct drm_crtc *crtc = dsi->output.encoder.crtc;
123 struct drm_device *drm = node->minor->dev;
124 int err = 0;
125
126 drm_modeset_lock_all(drm);
127
128 if (!crtc || !crtc->state->active) {
129 err = -EBUSY;
130 goto unlock;
131 }
132
133#define DUMP_REG(name) \
134 seq_printf(s, "%-32s %#05x %08x\n", #name, name, \
135 tegra_dsi_readl(dsi, name))
136
137 DUMP_REG(DSI_INCR_SYNCPT);
138 DUMP_REG(DSI_INCR_SYNCPT_CONTROL);
139 DUMP_REG(DSI_INCR_SYNCPT_ERROR);
140 DUMP_REG(DSI_CTXSW);
141 DUMP_REG(DSI_RD_DATA);
142 DUMP_REG(DSI_WR_DATA);
143 DUMP_REG(DSI_POWER_CONTROL);
144 DUMP_REG(DSI_INT_ENABLE);
145 DUMP_REG(DSI_INT_STATUS);
146 DUMP_REG(DSI_INT_MASK);
147 DUMP_REG(DSI_HOST_CONTROL);
148 DUMP_REG(DSI_CONTROL);
149 DUMP_REG(DSI_SOL_DELAY);
150 DUMP_REG(DSI_MAX_THRESHOLD);
151 DUMP_REG(DSI_TRIGGER);
152 DUMP_REG(DSI_TX_CRC);
153 DUMP_REG(DSI_STATUS);
154
155 DUMP_REG(DSI_INIT_SEQ_CONTROL);
156 DUMP_REG(DSI_INIT_SEQ_DATA_0);
157 DUMP_REG(DSI_INIT_SEQ_DATA_1);
158 DUMP_REG(DSI_INIT_SEQ_DATA_2);
159 DUMP_REG(DSI_INIT_SEQ_DATA_3);
160 DUMP_REG(DSI_INIT_SEQ_DATA_4);
161 DUMP_REG(DSI_INIT_SEQ_DATA_5);
162 DUMP_REG(DSI_INIT_SEQ_DATA_6);
163 DUMP_REG(DSI_INIT_SEQ_DATA_7);
164
165 DUMP_REG(DSI_PKT_SEQ_0_LO);
166 DUMP_REG(DSI_PKT_SEQ_0_HI);
167 DUMP_REG(DSI_PKT_SEQ_1_LO);
168 DUMP_REG(DSI_PKT_SEQ_1_HI);
169 DUMP_REG(DSI_PKT_SEQ_2_LO);
170 DUMP_REG(DSI_PKT_SEQ_2_HI);
171 DUMP_REG(DSI_PKT_SEQ_3_LO);
172 DUMP_REG(DSI_PKT_SEQ_3_HI);
173 DUMP_REG(DSI_PKT_SEQ_4_LO);
174 DUMP_REG(DSI_PKT_SEQ_4_HI);
175 DUMP_REG(DSI_PKT_SEQ_5_LO);
176 DUMP_REG(DSI_PKT_SEQ_5_HI);
177
178 DUMP_REG(DSI_DCS_CMDS);
179
180 DUMP_REG(DSI_PKT_LEN_0_1);
181 DUMP_REG(DSI_PKT_LEN_2_3);
182 DUMP_REG(DSI_PKT_LEN_4_5);
183 DUMP_REG(DSI_PKT_LEN_6_7);
184
185 DUMP_REG(DSI_PHY_TIMING_0);
186 DUMP_REG(DSI_PHY_TIMING_1);
187 DUMP_REG(DSI_PHY_TIMING_2);
188 DUMP_REG(DSI_BTA_TIMING);
189
190 DUMP_REG(DSI_TIMEOUT_0);
191 DUMP_REG(DSI_TIMEOUT_1);
192 DUMP_REG(DSI_TO_TALLY);
193
194 DUMP_REG(DSI_PAD_CONTROL_0);
195 DUMP_REG(DSI_PAD_CONTROL_CD);
196 DUMP_REG(DSI_PAD_CD_STATUS);
197 DUMP_REG(DSI_VIDEO_MODE_CONTROL);
198 DUMP_REG(DSI_PAD_CONTROL_1);
199 DUMP_REG(DSI_PAD_CONTROL_2);
200 DUMP_REG(DSI_PAD_CONTROL_3);
201 DUMP_REG(DSI_PAD_CONTROL_4);
202
203 DUMP_REG(DSI_GANGED_MODE_CONTROL);
204 DUMP_REG(DSI_GANGED_MODE_START);
205 DUMP_REG(DSI_GANGED_MODE_SIZE);
206
207 DUMP_REG(DSI_RAW_DATA_BYTE_COUNT);
208 DUMP_REG(DSI_ULTRA_LOW_POWER_CONTROL);
209
210 DUMP_REG(DSI_INIT_SEQ_DATA_8);
211 DUMP_REG(DSI_INIT_SEQ_DATA_9);
212 DUMP_REG(DSI_INIT_SEQ_DATA_10);
213 DUMP_REG(DSI_INIT_SEQ_DATA_11);
214 DUMP_REG(DSI_INIT_SEQ_DATA_12);
215 DUMP_REG(DSI_INIT_SEQ_DATA_13);
216 DUMP_REG(DSI_INIT_SEQ_DATA_14);
217 DUMP_REG(DSI_INIT_SEQ_DATA_15);
218
219#undef DUMP_REG
220
221unlock:
222 drm_modeset_unlock_all(drm);
223 return err;
224}
225
226static struct drm_info_list debugfs_files[] = {
227 { "regs", tegra_dsi_show_regs, 0, NULL },
228};
229
230static int tegra_dsi_debugfs_init(struct tegra_dsi *dsi,
231 struct drm_minor *minor)
232{
233 const char *name = dev_name(dsi->dev);
234 unsigned int i;
235 int err;
236
237 dsi->debugfs = debugfs_create_dir(name, minor->debugfs_root);
238 if (!dsi->debugfs)
239 return -ENOMEM;
240
241 dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
242 GFP_KERNEL);
243 if (!dsi->debugfs_files) {
244 err = -ENOMEM;
245 goto remove;
246 }
247
248 for (i = 0; i < ARRAY_SIZE(debugfs_files); i++)
249 dsi->debugfs_files[i].data = dsi;
250
251 err = drm_debugfs_create_files(dsi->debugfs_files,
252 ARRAY_SIZE(debugfs_files),
253 dsi->debugfs, minor);
254 if (err < 0)
255 goto free;
256
257 dsi->minor = minor;
258
259 return 0;
260
261free:
262 kfree(dsi->debugfs_files);
263 dsi->debugfs_files = NULL;
264remove:
265 debugfs_remove(dsi->debugfs);
266 dsi->debugfs = NULL;
267
268 return err;
269}
270
271static void tegra_dsi_debugfs_exit(struct tegra_dsi *dsi)
272{
273 drm_debugfs_remove_files(dsi->debugfs_files, ARRAY_SIZE(debugfs_files),
274 dsi->minor);
275 dsi->minor = NULL;
276
277 kfree(dsi->debugfs_files);
278 dsi->debugfs_files = NULL;
279
280 debugfs_remove(dsi->debugfs);
281 dsi->debugfs = NULL;
282}
283
284#define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9))
285#define PKT_LEN0(len) (((len) & 0x07) << 0)
286#define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19))
287#define PKT_LEN1(len) (((len) & 0x07) << 10)
288#define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29))
289#define PKT_LEN2(len) (((len) & 0x07) << 20)
290
291#define PKT_LP (1 << 30)
292#define NUM_PKT_SEQ 12
293
294/*
295 * non-burst mode with sync pulses
296 */
297static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = {
298 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
299 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
300 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
301 PKT_LP,
302 [ 1] = 0,
303 [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) |
304 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
305 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
306 PKT_LP,
307 [ 3] = 0,
308 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
309 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
310 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
311 PKT_LP,
312 [ 5] = 0,
313 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
314 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
315 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
316 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
317 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
318 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
319 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
320 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
321 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
322 PKT_LP,
323 [ 9] = 0,
324 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
325 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
326 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
327 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
328 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
329 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
330};
331
332/*
333 * non-burst mode with sync events
334 */
335static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = {
336 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
337 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
338 PKT_LP,
339 [ 1] = 0,
340 [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
341 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
342 PKT_LP,
343 [ 3] = 0,
344 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
345 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
346 PKT_LP,
347 [ 5] = 0,
348 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
349 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
350 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
351 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
352 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
353 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
354 PKT_LP,
355 [ 9] = 0,
356 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
357 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
358 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
359 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
360};
361
362static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = {
363 [ 0] = 0,
364 [ 1] = 0,
365 [ 2] = 0,
366 [ 3] = 0,
367 [ 4] = 0,
368 [ 5] = 0,
369 [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP,
370 [ 7] = 0,
371 [ 8] = 0,
372 [ 9] = 0,
373 [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP,
374 [11] = 0,
375};
376
377static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi,
378 unsigned long period,
379 const struct mipi_dphy_timing *timing)
380{
381 u32 value;
382
383 value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 |
384 DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 |
385 DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 |
386 DSI_TIMING_FIELD(timing->hsprepare, period, 1);
387 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0);
388
389 value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 |
390 DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 |
391 DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 |
392 DSI_TIMING_FIELD(timing->lpx, period, 1);
393 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1);
394
395 value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 |
396 DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 |
397 DSI_TIMING_FIELD(0xff * period, period, 0) << 0;
398 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2);
399
400 value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 |
401 DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 |
402 DSI_TIMING_FIELD(timing->tago, period, 1);
403 tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);
404
405 if (dsi->slave)
406 tegra_dsi_set_phy_timing(dsi->slave, period, timing);
407}
408
409static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,
410 unsigned int *mulp, unsigned int *divp)
411{
412 switch (format) {
413 case MIPI_DSI_FMT_RGB666_PACKED:
414 case MIPI_DSI_FMT_RGB888:
415 *mulp = 3;
416 *divp = 1;
417 break;
418
419 case MIPI_DSI_FMT_RGB565:
420 *mulp = 2;
421 *divp = 1;
422 break;
423
424 case MIPI_DSI_FMT_RGB666:
425 *mulp = 9;
426 *divp = 4;
427 break;
428
429 default:
430 return -EINVAL;
431 }
432
433 return 0;
434}
435
436static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format,
437 enum tegra_dsi_format *fmt)
438{
439 switch (format) {
440 case MIPI_DSI_FMT_RGB888:
441 *fmt = TEGRA_DSI_FORMAT_24P;
442 break;
443
444 case MIPI_DSI_FMT_RGB666:
445 *fmt = TEGRA_DSI_FORMAT_18NP;
446 break;
447
448 case MIPI_DSI_FMT_RGB666_PACKED:
449 *fmt = TEGRA_DSI_FORMAT_18P;
450 break;
451
452 case MIPI_DSI_FMT_RGB565:
453 *fmt = TEGRA_DSI_FORMAT_16P;
454 break;
455
456 default:
457 return -EINVAL;
458 }
459
460 return 0;
461}
462
463static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start,
464 unsigned int size)
465{
466 u32 value;
467
468 tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START);
469 tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE);
470
471 value = DSI_GANGED_MODE_CONTROL_ENABLE;
472 tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL);
473}
474
475static void tegra_dsi_enable(struct tegra_dsi *dsi)
476{
477 u32 value;
478
479 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
480 value |= DSI_POWER_CONTROL_ENABLE;
481 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
482
483 if (dsi->slave)
484 tegra_dsi_enable(dsi->slave);
485}
486
487static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi)
488{
489 if (dsi->master)
490 return dsi->master->lanes + dsi->lanes;
491
492 if (dsi->slave)
493 return dsi->lanes + dsi->slave->lanes;
494
495 return dsi->lanes;
496}
497
498static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
499 const struct drm_display_mode *mode)
500{
501 unsigned int hact, hsw, hbp, hfp, i, mul, div;
502 struct tegra_dsi_state *state;
503 const u32 *pkt_seq;
504 u32 value;
505
506 /* XXX: pass in state into this function? */
507 if (dsi->master)
508 state = tegra_dsi_get_state(dsi->master);
509 else
510 state = tegra_dsi_get_state(dsi);
511
512 mul = state->mul;
513 div = state->div;
514
515 if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
516 DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n");
517 pkt_seq = pkt_seq_video_non_burst_sync_pulses;
518 } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
519 DRM_DEBUG_KMS("Non-burst video mode with sync events\n");
520 pkt_seq = pkt_seq_video_non_burst_sync_events;
521 } else {
522 DRM_DEBUG_KMS("Command mode\n");
523 pkt_seq = pkt_seq_command_mode;
524 }
525
526 value = DSI_CONTROL_CHANNEL(0) |
527 DSI_CONTROL_FORMAT(state->format) |
528 DSI_CONTROL_LANES(dsi->lanes - 1) |
529 DSI_CONTROL_SOURCE(pipe);
530 tegra_dsi_writel(dsi, value, DSI_CONTROL);
531
532 tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD);
533
534 value = DSI_HOST_CONTROL_HS;
535 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
536
537 value = tegra_dsi_readl(dsi, DSI_CONTROL);
538
539 if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
540 value |= DSI_CONTROL_HS_CLK_CTRL;
541
542 value &= ~DSI_CONTROL_TX_TRIG(3);
543
544 /* enable DCS commands for command mode */
545 if (dsi->flags & MIPI_DSI_MODE_VIDEO)
546 value &= ~DSI_CONTROL_DCS_ENABLE;
547 else
548 value |= DSI_CONTROL_DCS_ENABLE;
549
550 value |= DSI_CONTROL_VIDEO_ENABLE;
551 value &= ~DSI_CONTROL_HOST_ENABLE;
552 tegra_dsi_writel(dsi, value, DSI_CONTROL);
553
554 for (i = 0; i < NUM_PKT_SEQ; i++)
555 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);
556
557 if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
558 /* horizontal active pixels */
559 hact = mode->hdisplay * mul / div;
560
561 /* horizontal sync width */
562 hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
563
564 /* horizontal back porch */
565 hbp = (mode->htotal - mode->hsync_end) * mul / div;
566
567 if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
568 hbp += hsw;
569
570 /* horizontal front porch */
571 hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
572
573 /* subtract packet overhead */
574 hsw -= 10;
575 hbp -= 14;
576 hfp -= 8;
577
578 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);
579 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3);
580 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5);
581 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7);
582
583 /* set SOL delay (for non-burst mode only) */
584 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY);
585
586 /* TODO: implement ganged mode */
587 } else {
588 u16 bytes;
589
590 if (dsi->master || dsi->slave) {
591 /*
592 * For ganged mode, assume symmetric left-right mode.
593 */
594 bytes = 1 + (mode->hdisplay / 2) * mul / div;
595 } else {
596 /* 1 byte (DCS command) + pixel data */
597 bytes = 1 + mode->hdisplay * mul / div;
598 }
599
600 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1);
601 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3);
602 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5);
603 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7);
604
605 value = MIPI_DCS_WRITE_MEMORY_START << 8 |
606 MIPI_DCS_WRITE_MEMORY_CONTINUE;
607 tegra_dsi_writel(dsi, value, DSI_DCS_CMDS);
608
609 /* set SOL delay */
610 if (dsi->master || dsi->slave) {
611 unsigned long delay, bclk, bclk_ganged;
612 unsigned int lanes = state->lanes;
613
614 /* SOL to valid, valid to FIFO and FIFO write delay */
615 delay = 4 + 4 + 2;
616 delay = DIV_ROUND_UP(delay * mul, div * lanes);
617 /* FIFO read delay */
618 delay = delay + 6;
619
620 bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes);
621 bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes);
622 value = bclk - bclk_ganged + delay + 20;
623 } else {
624 /* TODO: revisit for non-ganged mode */
625 value = 8 * mul / div;
626 }
627
628 tegra_dsi_writel(dsi, value, DSI_SOL_DELAY);
629 }
630
631 if (dsi->slave) {
632 tegra_dsi_configure(dsi->slave, pipe, mode);
633
634 /*
635 * TODO: Support modes other than symmetrical left-right
636 * split.
637 */
638 tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2);
639 tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2,
640 mode->hdisplay / 2);
641 }
642}
643
644static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout)
645{
646 u32 value;
647
648 timeout = jiffies + msecs_to_jiffies(timeout);
649
650 while (time_before(jiffies, timeout)) {
651 value = tegra_dsi_readl(dsi, DSI_STATUS);
652 if (value & DSI_STATUS_IDLE)
653 return 0;
654
655 usleep_range(1000, 2000);
656 }
657
658 return -ETIMEDOUT;
659}
660
661static void tegra_dsi_video_disable(struct tegra_dsi *dsi)
662{
663 u32 value;
664
665 value = tegra_dsi_readl(dsi, DSI_CONTROL);
666 value &= ~DSI_CONTROL_VIDEO_ENABLE;
667 tegra_dsi_writel(dsi, value, DSI_CONTROL);
668
669 if (dsi->slave)
670 tegra_dsi_video_disable(dsi->slave);
671}
672
673static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi)
674{
675 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START);
676 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE);
677 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL);
678}
679
680static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk,
681 unsigned int vrefresh)
682{
683 unsigned int timeout;
684 u32 value;
685
686 /* one frame high-speed transmission timeout */
687 timeout = (bclk / vrefresh) / 512;
688 value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout);
689 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0);
690
691 /* 2 ms peripheral timeout for panel */
692 timeout = 2 * bclk / 512 * 1000;
693 value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000);
694 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1);
695
696 value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0);
697 tegra_dsi_writel(dsi, value, DSI_TO_TALLY);
698
699 if (dsi->slave)
700 tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh);
701}
702
703static void tegra_dsi_disable(struct tegra_dsi *dsi)
704{
705 u32 value;
706
707 if (dsi->slave) {
708 tegra_dsi_ganged_disable(dsi->slave);
709 tegra_dsi_ganged_disable(dsi);
710 }
711
712 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
713 value &= ~DSI_POWER_CONTROL_ENABLE;
714 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
715
716 if (dsi->slave)
717 tegra_dsi_disable(dsi->slave);
718
719 usleep_range(5000, 10000);
720}
721
722static void tegra_dsi_soft_reset(struct tegra_dsi *dsi)
723{
724 u32 value;
725
726 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
727 value &= ~DSI_POWER_CONTROL_ENABLE;
728 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
729
730 usleep_range(300, 1000);
731
732 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
733 value |= DSI_POWER_CONTROL_ENABLE;
734 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
735
736 usleep_range(300, 1000);
737
738 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
739 if (value)
740 tegra_dsi_writel(dsi, 0, DSI_TRIGGER);
741
742 if (dsi->slave)
743 tegra_dsi_soft_reset(dsi->slave);
744}
745
746static void tegra_dsi_connector_reset(struct drm_connector *connector)
747{
748 struct tegra_dsi_state *state =
749 kzalloc(sizeof(*state), GFP_KERNEL);
750
751 if (state) {
752 kfree(connector->state);
753 __drm_atomic_helper_connector_reset(connector, &state->base);
754 }
755}
756
757static struct drm_connector_state *
758tegra_dsi_connector_duplicate_state(struct drm_connector *connector)
759{
760 struct tegra_dsi_state *state = to_dsi_state(connector->state);
761 struct tegra_dsi_state *copy;
762
763 copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
764 if (!copy)
765 return NULL;
766
767 return ©->base;
768}
769
770static const struct drm_connector_funcs tegra_dsi_connector_funcs = {
771 .dpms = drm_atomic_helper_connector_dpms,
772 .reset = tegra_dsi_connector_reset,
773 .detect = tegra_output_connector_detect,
774 .fill_modes = drm_helper_probe_single_connector_modes,
775 .destroy = tegra_output_connector_destroy,
776 .atomic_duplicate_state = tegra_dsi_connector_duplicate_state,
777 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
778};
779
780static enum drm_mode_status
781tegra_dsi_connector_mode_valid(struct drm_connector *connector,
782 struct drm_display_mode *mode)
783{
784 return MODE_OK;
785}
786
787static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = {
788 .get_modes = tegra_output_connector_get_modes,
789 .mode_valid = tegra_dsi_connector_mode_valid,
790 .best_encoder = tegra_output_connector_best_encoder,
791};
792
793static const struct drm_encoder_funcs tegra_dsi_encoder_funcs = {
794 .destroy = tegra_output_encoder_destroy,
795};
796
797static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
798{
799 struct tegra_output *output = encoder_to_output(encoder);
800 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
801 struct tegra_dsi *dsi = to_dsi(output);
802 u32 value;
803 int err;
804
805 if (output->panel)
806 drm_panel_disable(output->panel);
807
808 tegra_dsi_video_disable(dsi);
809
810 /*
811 * The following accesses registers of the display controller, so make
812 * sure it's only executed when the output is attached to one.
813 */
814 if (dc) {
815 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
816 value &= ~DSI_ENABLE;
817 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
818
819 tegra_dc_commit(dc);
820 }
821
822 err = tegra_dsi_wait_idle(dsi, 100);
823 if (err < 0)
824 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err);
825
826 tegra_dsi_soft_reset(dsi);
827
828 if (output->panel)
829 drm_panel_unprepare(output->panel);
830
831 tegra_dsi_disable(dsi);
832
833 return;
834}
835
836static void tegra_dsi_encoder_enable(struct drm_encoder *encoder)
837{
838 struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
839 struct tegra_output *output = encoder_to_output(encoder);
840 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
841 struct tegra_dsi *dsi = to_dsi(output);
842 struct tegra_dsi_state *state;
843 u32 value;
844
845 state = tegra_dsi_get_state(dsi);
846
847 tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh);
848
849 /*
850 * The D-PHY timing fields are expressed in byte-clock cycles, so
851 * multiply the period by 8.
852 */
853 tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing);
854
855 if (output->panel)
856 drm_panel_prepare(output->panel);
857
858 tegra_dsi_configure(dsi, dc->pipe, mode);
859
860 /* enable display controller */
861 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
862 value |= DSI_ENABLE;
863 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
864
865 tegra_dc_commit(dc);
866
867 /* enable DSI controller */
868 tegra_dsi_enable(dsi);
869
870 if (output->panel)
871 drm_panel_enable(output->panel);
872
873 return;
874}
875
876static int
877tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder,
878 struct drm_crtc_state *crtc_state,
879 struct drm_connector_state *conn_state)
880{
881 struct tegra_output *output = encoder_to_output(encoder);
882 struct tegra_dsi_state *state = to_dsi_state(conn_state);
883 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc);
884 struct tegra_dsi *dsi = to_dsi(output);
885 unsigned int scdiv;
886 unsigned long plld;
887 int err;
888
889 state->pclk = crtc_state->mode.clock * 1000;
890
891 err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div);
892 if (err < 0)
893 return err;
894
895 state->lanes = tegra_dsi_get_lanes(dsi);
896
897 err = tegra_dsi_get_format(dsi->format, &state->format);
898 if (err < 0)
899 return err;
900
901 state->vrefresh = drm_mode_vrefresh(&crtc_state->mode);
902
903 /* compute byte clock */
904 state->bclk = (state->pclk * state->mul) / (state->div * state->lanes);
905
906 DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div,
907 state->lanes);
908 DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format,
909 state->vrefresh);
910 DRM_DEBUG_KMS("bclk: %lu\n", state->bclk);
911
912 /*
913 * Compute bit clock and round up to the next MHz.
914 */
915 plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC;
916 state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld);
917
918 err = mipi_dphy_timing_get_default(&state->timing, state->period);
919 if (err < 0)
920 return err;
921
922 err = mipi_dphy_timing_validate(&state->timing, state->period);
923 if (err < 0) {
924 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
925 return err;
926 }
927
928 /*
929 * We divide the frequency by two here, but we make up for that by
930 * setting the shift clock divider (further below) to half of the
931 * correct value.
932 */
933 plld /= 2;
934
935 /*
936 * Derive pixel clock from bit clock using the shift clock divider.
937 * Note that this is only half of what we would expect, but we need
938 * that to make up for the fact that we divided the bit clock by a
939 * factor of two above.
940 *
941 * It's not clear exactly why this is necessary, but the display is
942 * not working properly otherwise. Perhaps the PLLs cannot generate
943 * frequencies sufficiently high.
944 */
945 scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2;
946
947 err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent,
948 plld, scdiv);
949 if (err < 0) {
950 dev_err(output->dev, "failed to setup CRTC state: %d\n", err);
951 return err;
952 }
953
954 return err;
955}
956
957static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = {
958 .disable = tegra_dsi_encoder_disable,
959 .enable = tegra_dsi_encoder_enable,
960 .atomic_check = tegra_dsi_encoder_atomic_check,
961};
962
963static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
964{
965 u32 value;
966
967 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
968 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
969
970 return 0;
971}
972
973static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
974{
975 u32 value;
976
977 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
978 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
979 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
980 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
981 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
982
983 /* start calibration */
984 tegra_dsi_pad_enable(dsi);
985
986 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
987 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
988 DSI_PAD_OUT_CLK(0x0);
989 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);
990
991 value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) |
992 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3);
993 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3);
994
995 return tegra_mipi_calibrate(dsi->mipi);
996}
997
998static int tegra_dsi_init(struct host1x_client *client)
999{
1000 struct drm_device *drm = dev_get_drvdata(client->parent);
1001 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1002 int err;
1003
1004 reset_control_deassert(dsi->rst);
1005
1006 err = tegra_dsi_pad_calibrate(dsi);
1007 if (err < 0) {
1008 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
1009 goto reset;
1010 }
1011
1012 /* Gangsters must not register their own outputs. */
1013 if (!dsi->master) {
1014 dsi->output.dev = client->dev;
1015
1016 drm_connector_init(drm, &dsi->output.connector,
1017 &tegra_dsi_connector_funcs,
1018 DRM_MODE_CONNECTOR_DSI);
1019 drm_connector_helper_add(&dsi->output.connector,
1020 &tegra_dsi_connector_helper_funcs);
1021 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF;
1022
1023 drm_encoder_init(drm, &dsi->output.encoder,
1024 &tegra_dsi_encoder_funcs,
1025 DRM_MODE_ENCODER_DSI, NULL);
1026 drm_encoder_helper_add(&dsi->output.encoder,
1027 &tegra_dsi_encoder_helper_funcs);
1028
1029 drm_mode_connector_attach_encoder(&dsi->output.connector,
1030 &dsi->output.encoder);
1031 drm_connector_register(&dsi->output.connector);
1032
1033 err = tegra_output_init(drm, &dsi->output);
1034 if (err < 0) {
1035 dev_err(client->dev,
1036 "failed to initialize output: %d\n",
1037 err);
1038 goto reset;
1039 }
1040
1041 dsi->output.encoder.possible_crtcs = 0x3;
1042 }
1043
1044 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
1045 err = tegra_dsi_debugfs_init(dsi, drm->primary);
1046 if (err < 0)
1047 dev_err(dsi->dev, "debugfs setup failed: %d\n", err);
1048 }
1049
1050 return 0;
1051
1052reset:
1053 reset_control_assert(dsi->rst);
1054 return err;
1055}
1056
1057static int tegra_dsi_exit(struct host1x_client *client)
1058{
1059 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1060
1061 tegra_output_exit(&dsi->output);
1062
1063 if (IS_ENABLED(CONFIG_DEBUG_FS))
1064 tegra_dsi_debugfs_exit(dsi);
1065
1066 reset_control_assert(dsi->rst);
1067
1068 return 0;
1069}
1070
1071static const struct host1x_client_ops dsi_client_ops = {
1072 .init = tegra_dsi_init,
1073 .exit = tegra_dsi_exit,
1074};
1075
1076static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
1077{
1078 struct clk *parent;
1079 int err;
1080
1081 parent = clk_get_parent(dsi->clk);
1082 if (!parent)
1083 return -EINVAL;
1084
1085 err = clk_set_parent(parent, dsi->clk_parent);
1086 if (err < 0)
1087 return err;
1088
1089 return 0;
1090}
1091
1092static const char * const error_report[16] = {
1093 "SoT Error",
1094 "SoT Sync Error",
1095 "EoT Sync Error",
1096 "Escape Mode Entry Command Error",
1097 "Low-Power Transmit Sync Error",
1098 "Peripheral Timeout Error",
1099 "False Control Error",
1100 "Contention Detected",
1101 "ECC Error, single-bit",
1102 "ECC Error, multi-bit",
1103 "Checksum Error",
1104 "DSI Data Type Not Recognized",
1105 "DSI VC ID Invalid",
1106 "Invalid Transmission Length",
1107 "Reserved",
1108 "DSI Protocol Violation",
1109};
1110
1111static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi,
1112 const struct mipi_dsi_msg *msg,
1113 size_t count)
1114{
1115 u8 *rx = msg->rx_buf;
1116 unsigned int i, j, k;
1117 size_t size = 0;
1118 u16 errors;
1119 u32 value;
1120
1121 /* read and parse packet header */
1122 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1123
1124 switch (value & 0x3f) {
1125 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1126 errors = (value >> 8) & 0xffff;
1127 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n",
1128 errors);
1129 for (i = 0; i < ARRAY_SIZE(error_report); i++)
1130 if (errors & BIT(i))
1131 dev_dbg(dsi->dev, " %2u: %s\n", i,
1132 error_report[i]);
1133 break;
1134
1135 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1136 rx[0] = (value >> 8) & 0xff;
1137 size = 1;
1138 break;
1139
1140 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1141 rx[0] = (value >> 8) & 0xff;
1142 rx[1] = (value >> 16) & 0xff;
1143 size = 2;
1144 break;
1145
1146 case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
1147 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1148 break;
1149
1150 case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
1151 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1152 break;
1153
1154 default:
1155 dev_err(dsi->dev, "unhandled response type: %02x\n",
1156 value & 0x3f);
1157 return -EPROTO;
1158 }
1159
1160 size = min(size, msg->rx_len);
1161
1162 if (msg->rx_buf && size > 0) {
1163 for (i = 0, j = 0; i < count - 1; i++, j += 4) {
1164 u8 *rx = msg->rx_buf + j;
1165
1166 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1167
1168 for (k = 0; k < 4 && (j + k) < msg->rx_len; k++)
1169 rx[j + k] = (value >> (k << 3)) & 0xff;
1170 }
1171 }
1172
1173 return size;
1174}
1175
1176static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout)
1177{
1178 tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER);
1179
1180 timeout = jiffies + msecs_to_jiffies(timeout);
1181
1182 while (time_before(jiffies, timeout)) {
1183 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
1184 if ((value & DSI_TRIGGER_HOST) == 0)
1185 return 0;
1186
1187 usleep_range(1000, 2000);
1188 }
1189
1190 DRM_DEBUG_KMS("timeout waiting for transmission to complete\n");
1191 return -ETIMEDOUT;
1192}
1193
1194static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi,
1195 unsigned long timeout)
1196{
1197 timeout = jiffies + msecs_to_jiffies(250);
1198
1199 while (time_before(jiffies, timeout)) {
1200 u32 value = tegra_dsi_readl(dsi, DSI_STATUS);
1201 u8 count = value & 0x1f;
1202
1203 if (count > 0)
1204 return count;
1205
1206 usleep_range(1000, 2000);
1207 }
1208
1209 DRM_DEBUG_KMS("peripheral returned no data\n");
1210 return -ETIMEDOUT;
1211}
1212
1213static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset,
1214 const void *buffer, size_t size)
1215{
1216 const u8 *buf = buffer;
1217 size_t i, j;
1218 u32 value;
1219
1220 for (j = 0; j < size; j += 4) {
1221 value = 0;
1222
1223 for (i = 0; i < 4 && j + i < size; i++)
1224 value |= buf[j + i] << (i << 3);
1225
1226 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1227 }
1228}
1229
1230static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host,
1231 const struct mipi_dsi_msg *msg)
1232{
1233 struct tegra_dsi *dsi = host_to_tegra(host);
1234 struct mipi_dsi_packet packet;
1235 const u8 *header;
1236 size_t count;
1237 ssize_t err;
1238 u32 value;
1239
1240 err = mipi_dsi_create_packet(&packet, msg);
1241 if (err < 0)
1242 return err;
1243
1244 header = packet.header;
1245
1246 /* maximum FIFO depth is 1920 words */
1247 if (packet.size > dsi->video_fifo_depth * 4)
1248 return -ENOSPC;
1249
1250 /* reset underflow/overflow flags */
1251 value = tegra_dsi_readl(dsi, DSI_STATUS);
1252 if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) {
1253 value = DSI_HOST_CONTROL_FIFO_RESET;
1254 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1255 usleep_range(10, 20);
1256 }
1257
1258 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
1259 value |= DSI_POWER_CONTROL_ENABLE;
1260 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
1261
1262 usleep_range(5000, 10000);
1263
1264 value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST |
1265 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC;
1266
1267 if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0)
1268 value |= DSI_HOST_CONTROL_HS;
1269
1270 /*
1271 * The host FIFO has a maximum of 64 words, so larger transmissions
1272 * need to use the video FIFO.
1273 */
1274 if (packet.size > dsi->host_fifo_depth * 4)
1275 value |= DSI_HOST_CONTROL_FIFO_SEL;
1276
1277 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1278
1279 /*
1280 * For reads and messages with explicitly requested ACK, generate a
1281 * BTA sequence after the transmission of the packet.
1282 */
1283 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1284 (msg->rx_buf && msg->rx_len > 0)) {
1285 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
1286 value |= DSI_HOST_CONTROL_PKT_BTA;
1287 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1288 }
1289
1290 value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE;
1291 tegra_dsi_writel(dsi, value, DSI_CONTROL);
1292
1293 /* write packet header, ECC is generated by hardware */
1294 value = header[2] << 16 | header[1] << 8 | header[0];
1295 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1296
1297 /* write payload (if any) */
1298 if (packet.payload_length > 0)
1299 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload,
1300 packet.payload_length);
1301
1302 err = tegra_dsi_transmit(dsi, 250);
1303 if (err < 0)
1304 return err;
1305
1306 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1307 (msg->rx_buf && msg->rx_len > 0)) {
1308 err = tegra_dsi_wait_for_response(dsi, 250);
1309 if (err < 0)
1310 return err;
1311
1312 count = err;
1313
1314 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1315 switch (value) {
1316 case 0x84:
1317 /*
1318 dev_dbg(dsi->dev, "ACK\n");
1319 */
1320 break;
1321
1322 case 0x87:
1323 /*
1324 dev_dbg(dsi->dev, "ESCAPE\n");
1325 */
1326 break;
1327
1328 default:
1329 dev_err(dsi->dev, "unknown status: %08x\n", value);
1330 break;
1331 }
1332
1333 if (count > 1) {
1334 err = tegra_dsi_read_response(dsi, msg, count);
1335 if (err < 0)
1336 dev_err(dsi->dev,
1337 "failed to parse response: %zd\n",
1338 err);
1339 else {
1340 /*
1341 * For read commands, return the number of
1342 * bytes returned by the peripheral.
1343 */
1344 count = err;
1345 }
1346 }
1347 } else {
1348 /*
1349 * For write commands, we have transmitted the 4-byte header
1350 * plus the variable-length payload.
1351 */
1352 count = 4 + packet.payload_length;
1353 }
1354
1355 return count;
1356}
1357
1358static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi)
1359{
1360 struct clk *parent;
1361 int err;
1362
1363 /* make sure both DSI controllers share the same PLL */
1364 parent = clk_get_parent(dsi->slave->clk);
1365 if (!parent)
1366 return -EINVAL;
1367
1368 err = clk_set_parent(parent, dsi->clk_parent);
1369 if (err < 0)
1370 return err;
1371
1372 return 0;
1373}
1374
1375static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
1376 struct mipi_dsi_device *device)
1377{
1378 struct tegra_dsi *dsi = host_to_tegra(host);
1379
1380 dsi->flags = device->mode_flags;
1381 dsi->format = device->format;
1382 dsi->lanes = device->lanes;
1383
1384 if (dsi->slave) {
1385 int err;
1386
1387 dev_dbg(dsi->dev, "attaching dual-channel device %s\n",
1388 dev_name(&device->dev));
1389
1390 err = tegra_dsi_ganged_setup(dsi);
1391 if (err < 0) {
1392 dev_err(dsi->dev, "failed to set up ganged mode: %d\n",
1393 err);
1394 return err;
1395 }
1396 }
1397
1398 /*
1399 * Slaves don't have a panel associated with them, so they provide
1400 * merely the second channel.
1401 */
1402 if (!dsi->master) {
1403 struct tegra_output *output = &dsi->output;
1404
1405 output->panel = of_drm_find_panel(device->dev.of_node);
1406 if (output->panel && output->connector.dev) {
1407 drm_panel_attach(output->panel, &output->connector);
1408 drm_helper_hpd_irq_event(output->connector.dev);
1409 }
1410 }
1411
1412 return 0;
1413}
1414
1415static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
1416 struct mipi_dsi_device *device)
1417{
1418 struct tegra_dsi *dsi = host_to_tegra(host);
1419 struct tegra_output *output = &dsi->output;
1420
1421 if (output->panel && &device->dev == output->panel->dev) {
1422 output->panel = NULL;
1423
1424 if (output->connector.dev)
1425 drm_helper_hpd_irq_event(output->connector.dev);
1426 }
1427
1428 return 0;
1429}
1430
1431static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
1432 .attach = tegra_dsi_host_attach,
1433 .detach = tegra_dsi_host_detach,
1434 .transfer = tegra_dsi_host_transfer,
1435};
1436
1437static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
1438{
1439 struct device_node *np;
1440
1441 np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0);
1442 if (np) {
1443 struct platform_device *gangster = of_find_device_by_node(np);
1444
1445 dsi->slave = platform_get_drvdata(gangster);
1446 of_node_put(np);
1447
1448 if (!dsi->slave)
1449 return -EPROBE_DEFER;
1450
1451 dsi->slave->master = dsi;
1452 }
1453
1454 return 0;
1455}
1456
1457static int tegra_dsi_probe(struct platform_device *pdev)
1458{
1459 struct tegra_dsi *dsi;
1460 struct resource *regs;
1461 int err;
1462
1463 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
1464 if (!dsi)
1465 return -ENOMEM;
1466
1467 dsi->output.dev = dsi->dev = &pdev->dev;
1468 dsi->video_fifo_depth = 1920;
1469 dsi->host_fifo_depth = 64;
1470
1471 err = tegra_dsi_ganged_probe(dsi);
1472 if (err < 0)
1473 return err;
1474
1475 err = tegra_output_probe(&dsi->output);
1476 if (err < 0)
1477 return err;
1478
1479 dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD;
1480
1481 /*
1482 * Assume these values by default. When a DSI peripheral driver
1483 * attaches to the DSI host, the parameters will be taken from
1484 * the attached device.
1485 */
1486 dsi->flags = MIPI_DSI_MODE_VIDEO;
1487 dsi->format = MIPI_DSI_FMT_RGB888;
1488 dsi->lanes = 4;
1489
1490 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
1491 if (IS_ERR(dsi->rst))
1492 return PTR_ERR(dsi->rst);
1493
1494 dsi->clk = devm_clk_get(&pdev->dev, NULL);
1495 if (IS_ERR(dsi->clk)) {
1496 dev_err(&pdev->dev, "cannot get DSI clock\n");
1497 err = PTR_ERR(dsi->clk);
1498 goto reset;
1499 }
1500
1501 err = clk_prepare_enable(dsi->clk);
1502 if (err < 0) {
1503 dev_err(&pdev->dev, "cannot enable DSI clock\n");
1504 goto reset;
1505 }
1506
1507 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
1508 if (IS_ERR(dsi->clk_lp)) {
1509 dev_err(&pdev->dev, "cannot get low-power clock\n");
1510 err = PTR_ERR(dsi->clk_lp);
1511 goto disable_clk;
1512 }
1513
1514 err = clk_prepare_enable(dsi->clk_lp);
1515 if (err < 0) {
1516 dev_err(&pdev->dev, "cannot enable low-power clock\n");
1517 goto disable_clk;
1518 }
1519
1520 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
1521 if (IS_ERR(dsi->clk_parent)) {
1522 dev_err(&pdev->dev, "cannot get parent clock\n");
1523 err = PTR_ERR(dsi->clk_parent);
1524 goto disable_clk_lp;
1525 }
1526
1527 dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");
1528 if (IS_ERR(dsi->vdd)) {
1529 dev_err(&pdev->dev, "cannot get VDD supply\n");
1530 err = PTR_ERR(dsi->vdd);
1531 goto disable_clk_lp;
1532 }
1533
1534 err = regulator_enable(dsi->vdd);
1535 if (err < 0) {
1536 dev_err(&pdev->dev, "cannot enable VDD supply\n");
1537 goto disable_clk_lp;
1538 }
1539
1540 err = tegra_dsi_setup_clocks(dsi);
1541 if (err < 0) {
1542 dev_err(&pdev->dev, "cannot setup clocks\n");
1543 goto disable_vdd;
1544 }
1545
1546 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1547 dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
1548 if (IS_ERR(dsi->regs)) {
1549 err = PTR_ERR(dsi->regs);
1550 goto disable_vdd;
1551 }
1552
1553 dsi->mipi = tegra_mipi_request(&pdev->dev);
1554 if (IS_ERR(dsi->mipi)) {
1555 err = PTR_ERR(dsi->mipi);
1556 goto disable_vdd;
1557 }
1558
1559 dsi->host.ops = &tegra_dsi_host_ops;
1560 dsi->host.dev = &pdev->dev;
1561
1562 err = mipi_dsi_host_register(&dsi->host);
1563 if (err < 0) {
1564 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
1565 goto mipi_free;
1566 }
1567
1568 INIT_LIST_HEAD(&dsi->client.list);
1569 dsi->client.ops = &dsi_client_ops;
1570 dsi->client.dev = &pdev->dev;
1571
1572 err = host1x_client_register(&dsi->client);
1573 if (err < 0) {
1574 dev_err(&pdev->dev, "failed to register host1x client: %d\n",
1575 err);
1576 goto unregister;
1577 }
1578
1579 platform_set_drvdata(pdev, dsi);
1580
1581 return 0;
1582
1583unregister:
1584 mipi_dsi_host_unregister(&dsi->host);
1585mipi_free:
1586 tegra_mipi_free(dsi->mipi);
1587disable_vdd:
1588 regulator_disable(dsi->vdd);
1589disable_clk_lp:
1590 clk_disable_unprepare(dsi->clk_lp);
1591disable_clk:
1592 clk_disable_unprepare(dsi->clk);
1593reset:
1594 reset_control_assert(dsi->rst);
1595 return err;
1596}
1597
1598static int tegra_dsi_remove(struct platform_device *pdev)
1599{
1600 struct tegra_dsi *dsi = platform_get_drvdata(pdev);
1601 int err;
1602
1603 err = host1x_client_unregister(&dsi->client);
1604 if (err < 0) {
1605 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
1606 err);
1607 return err;
1608 }
1609
1610 tegra_output_remove(&dsi->output);
1611
1612 mipi_dsi_host_unregister(&dsi->host);
1613 tegra_mipi_free(dsi->mipi);
1614
1615 regulator_disable(dsi->vdd);
1616 clk_disable_unprepare(dsi->clk_lp);
1617 clk_disable_unprepare(dsi->clk);
1618 reset_control_assert(dsi->rst);
1619
1620 return 0;
1621}
1622
1623static const struct of_device_id tegra_dsi_of_match[] = {
1624 { .compatible = "nvidia,tegra210-dsi", },
1625 { .compatible = "nvidia,tegra132-dsi", },
1626 { .compatible = "nvidia,tegra124-dsi", },
1627 { .compatible = "nvidia,tegra114-dsi", },
1628 { },
1629};
1630MODULE_DEVICE_TABLE(of, tegra_dsi_of_match);
1631
1632struct platform_driver tegra_dsi_driver = {
1633 .driver = {
1634 .name = "tegra-dsi",
1635 .of_match_table = tegra_dsi_of_match,
1636 },
1637 .probe = tegra_dsi_probe,
1638 .remove = tegra_dsi_remove,
1639};