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irqchip/ts4800: Add TS-4800 interrupt controller
[linux/fpc-iii.git] / drivers / gpu / drm / tegra / dsi.c
blobf0a138ef68ce8935bdb33d0a9c6191989b77c7f9
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
31 struct 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
47 static inline struct tegra_dsi_state *
48 to_dsi_state(struct drm_connector_state *state)
49 {
50 return container_of(state, struct tegra_dsi_state, base);
51 }
52
53 struct 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
86 static inline struct tegra_dsi *
87 host1x_client_to_dsi(struct host1x_client *client)
88 {
89 return container_of(client, struct tegra_dsi, client);
90 }
91
92 static inline struct tegra_dsi *host_to_tegra(struct mipi_dsi_host *host)
93 {
94 return container_of(host, struct tegra_dsi, host);
95 }
96
97 static inline struct tegra_dsi *to_dsi(struct tegra_output *output)
98 {
99 return container_of(output, struct tegra_dsi, output);
100 }
101
102 static struct tegra_dsi_state *tegra_dsi_get_state(struct tegra_dsi *dsi)
103 {
104 return to_dsi_state(dsi->output.connector.state);
105 }
106
107 static inline u32 tegra_dsi_readl(struct tegra_dsi *dsi, unsigned long reg)
108 {
109 return readl(dsi->regs + (reg << 2));
110 }
111
112 static 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
118 static 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
221 unlock:
222 drm_modeset_unlock_all(drm);
223 return err;
224 }
225
226 static struct drm_info_list debugfs_files[] = {
227 { "regs", tegra_dsi_show_regs, 0, NULL },
228 };
229
230 static 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
261 free:
262 kfree(dsi->debugfs_files);
263 dsi->debugfs_files = NULL;
264 remove:
265 debugfs_remove(dsi->debugfs);
266 dsi->debugfs = NULL;
267
268 return err;
269 }
270
271 static 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 */
297 static 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 */
335 static 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
362 static 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
377 static 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
409 static 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
436 static 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
463 static 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
475 static 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
487 static 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
498 static 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
644 static 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
661 static 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
673 static 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
680 static 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
703 static 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
722 static 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
746 static void tegra_dsi_connector_reset(struct drm_connector *connector)
747 {
748 struct tegra_dsi_state *state;
749
750 kfree(connector->state);
751 connector->state = NULL;
752
753 state = kzalloc(sizeof(*state), GFP_KERNEL);
754 if (state)
755 connector->state = &state->base;
756 }
757
758 static struct drm_connector_state *
759 tegra_dsi_connector_duplicate_state(struct drm_connector *connector)
760 {
761 struct tegra_dsi_state *state = to_dsi_state(connector->state);
762 struct tegra_dsi_state *copy;
763
764 copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
765 if (!copy)
766 return NULL;
767
768 return &copy->base;
769 }
770
771 static const struct drm_connector_funcs tegra_dsi_connector_funcs = {
772 .dpms = drm_atomic_helper_connector_dpms,
773 .reset = tegra_dsi_connector_reset,
774 .detect = tegra_output_connector_detect,
775 .fill_modes = drm_helper_probe_single_connector_modes,
776 .destroy = tegra_output_connector_destroy,
777 .atomic_duplicate_state = tegra_dsi_connector_duplicate_state,
778 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
779 };
780
781 static enum drm_mode_status
782 tegra_dsi_connector_mode_valid(struct drm_connector *connector,
783 struct drm_display_mode *mode)
784 {
785 return MODE_OK;
786 }
787
788 static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = {
789 .get_modes = tegra_output_connector_get_modes,
790 .mode_valid = tegra_dsi_connector_mode_valid,
791 .best_encoder = tegra_output_connector_best_encoder,
792 };
793
794 static const struct drm_encoder_funcs tegra_dsi_encoder_funcs = {
795 .destroy = tegra_output_encoder_destroy,
796 };
797
798 static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
799 {
800 struct tegra_output *output = encoder_to_output(encoder);
801 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
802 struct tegra_dsi *dsi = to_dsi(output);
803 u32 value;
804 int err;
805
806 if (output->panel)
807 drm_panel_disable(output->panel);
808
809 tegra_dsi_video_disable(dsi);
810
811 /*
812 * The following accesses registers of the display controller, so make
813 * sure it's only executed when the output is attached to one.
814 */
815 if (dc) {
816 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
817 value &= ~DSI_ENABLE;
818 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
819
820 tegra_dc_commit(dc);
821 }
822
823 err = tegra_dsi_wait_idle(dsi, 100);
824 if (err < 0)
825 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err);
826
827 tegra_dsi_soft_reset(dsi);
828
829 if (output->panel)
830 drm_panel_unprepare(output->panel);
831
832 tegra_dsi_disable(dsi);
833
834 return;
835 }
836
837 static void tegra_dsi_encoder_enable(struct drm_encoder *encoder)
838 {
839 struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
840 struct tegra_output *output = encoder_to_output(encoder);
841 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
842 struct tegra_dsi *dsi = to_dsi(output);
843 struct tegra_dsi_state *state;
844 u32 value;
845
846 state = tegra_dsi_get_state(dsi);
847
848 tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh);
849
850 /*
851 * The D-PHY timing fields are expressed in byte-clock cycles, so
852 * multiply the period by 8.
853 */
854 tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing);
855
856 if (output->panel)
857 drm_panel_prepare(output->panel);
858
859 tegra_dsi_configure(dsi, dc->pipe, mode);
860
861 /* enable display controller */
862 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
863 value |= DSI_ENABLE;
864 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
865
866 tegra_dc_commit(dc);
867
868 /* enable DSI controller */
869 tegra_dsi_enable(dsi);
870
871 if (output->panel)
872 drm_panel_enable(output->panel);
873
874 return;
875 }
876
877 static int
878 tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder,
879 struct drm_crtc_state *crtc_state,
880 struct drm_connector_state *conn_state)
881 {
882 struct tegra_output *output = encoder_to_output(encoder);
883 struct tegra_dsi_state *state = to_dsi_state(conn_state);
884 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc);
885 struct tegra_dsi *dsi = to_dsi(output);
886 unsigned int scdiv;
887 unsigned long plld;
888 int err;
889
890 state->pclk = crtc_state->mode.clock * 1000;
891
892 err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div);
893 if (err < 0)
894 return err;
895
896 state->lanes = tegra_dsi_get_lanes(dsi);
897
898 err = tegra_dsi_get_format(dsi->format, &state->format);
899 if (err < 0)
900 return err;
901
902 state->vrefresh = drm_mode_vrefresh(&crtc_state->mode);
903
904 /* compute byte clock */
905 state->bclk = (state->pclk * state->mul) / (state->div * state->lanes);
906
907 DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div,
908 state->lanes);
909 DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format,
910 state->vrefresh);
911 DRM_DEBUG_KMS("bclk: %lu\n", state->bclk);
912
913 /*
914 * Compute bit clock and round up to the next MHz.
915 */
916 plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC;
917 state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld);
918
919 err = mipi_dphy_timing_get_default(&state->timing, state->period);
920 if (err < 0)
921 return err;
922
923 err = mipi_dphy_timing_validate(&state->timing, state->period);
924 if (err < 0) {
925 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
926 return err;
927 }
928
929 /*
930 * We divide the frequency by two here, but we make up for that by
931 * setting the shift clock divider (further below) to half of the
932 * correct value.
933 */
934 plld /= 2;
935
936 /*
937 * Derive pixel clock from bit clock using the shift clock divider.
938 * Note that this is only half of what we would expect, but we need
939 * that to make up for the fact that we divided the bit clock by a
940 * factor of two above.
941 *
942 * It's not clear exactly why this is necessary, but the display is
943 * not working properly otherwise. Perhaps the PLLs cannot generate
944 * frequencies sufficiently high.
945 */
946 scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2;
947
948 err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent,
949 plld, scdiv);
950 if (err < 0) {
951 dev_err(output->dev, "failed to setup CRTC state: %d\n", err);
952 return err;
953 }
954
955 return err;
956 }
957
958 static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = {
959 .disable = tegra_dsi_encoder_disable,
960 .enable = tegra_dsi_encoder_enable,
961 .atomic_check = tegra_dsi_encoder_atomic_check,
962 };
963
964 static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
965 {
966 u32 value;
967
968 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
969 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
970
971 return 0;
972 }
973
974 static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
975 {
976 u32 value;
977
978 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
979 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
980 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
981 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
982 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
983
984 /* start calibration */
985 tegra_dsi_pad_enable(dsi);
986
987 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
988 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
989 DSI_PAD_OUT_CLK(0x0);
990 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);
991
992 value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) |
993 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3);
994 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3);
995
996 return tegra_mipi_calibrate(dsi->mipi);
997 }
998
999 static int tegra_dsi_init(struct host1x_client *client)
1000 {
1001 struct drm_device *drm = dev_get_drvdata(client->parent);
1002 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1003 int err;
1004
1005 reset_control_deassert(dsi->rst);
1006
1007 err = tegra_dsi_pad_calibrate(dsi);
1008 if (err < 0) {
1009 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
1010 goto reset;
1011 }
1012
1013 /* Gangsters must not register their own outputs. */
1014 if (!dsi->master) {
1015 dsi->output.dev = client->dev;
1016
1017 drm_connector_init(drm, &dsi->output.connector,
1018 &tegra_dsi_connector_funcs,
1019 DRM_MODE_CONNECTOR_DSI);
1020 drm_connector_helper_add(&dsi->output.connector,
1021 &tegra_dsi_connector_helper_funcs);
1022 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF;
1023
1024 drm_encoder_init(drm, &dsi->output.encoder,
1025 &tegra_dsi_encoder_funcs,
1026 DRM_MODE_ENCODER_DSI);
1027 drm_encoder_helper_add(&dsi->output.encoder,
1028 &tegra_dsi_encoder_helper_funcs);
1029
1030 drm_mode_connector_attach_encoder(&dsi->output.connector,
1031 &dsi->output.encoder);
1032 drm_connector_register(&dsi->output.connector);
1033
1034 err = tegra_output_init(drm, &dsi->output);
1035 if (err < 0) {
1036 dev_err(client->dev,
1037 "failed to initialize output: %d\n",
1038 err);
1039 goto reset;
1040 }
1041
1042 dsi->output.encoder.possible_crtcs = 0x3;
1043 }
1044
1045 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
1046 err = tegra_dsi_debugfs_init(dsi, drm->primary);
1047 if (err < 0)
1048 dev_err(dsi->dev, "debugfs setup failed: %d\n", err);
1049 }
1050
1051 return 0;
1052
1053 reset:
1054 reset_control_assert(dsi->rst);
1055 return err;
1056 }
1057
1058 static int tegra_dsi_exit(struct host1x_client *client)
1059 {
1060 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1061
1062 tegra_output_exit(&dsi->output);
1063
1064 if (IS_ENABLED(CONFIG_DEBUG_FS))
1065 tegra_dsi_debugfs_exit(dsi);
1066
1067 reset_control_assert(dsi->rst);
1068
1069 return 0;
1070 }
1071
1072 static const struct host1x_client_ops dsi_client_ops = {
1073 .init = tegra_dsi_init,
1074 .exit = tegra_dsi_exit,
1075 };
1076
1077 static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
1078 {
1079 struct clk *parent;
1080 int err;
1081
1082 parent = clk_get_parent(dsi->clk);
1083 if (!parent)
1084 return -EINVAL;
1085
1086 err = clk_set_parent(parent, dsi->clk_parent);
1087 if (err < 0)
1088 return err;
1089
1090 return 0;
1091 }
1092
1093 static const char * const error_report[16] = {
1094 "SoT Error",
1095 "SoT Sync Error",
1096 "EoT Sync Error",
1097 "Escape Mode Entry Command Error",
1098 "Low-Power Transmit Sync Error",
1099 "Peripheral Timeout Error",
1100 "False Control Error",
1101 "Contention Detected",
1102 "ECC Error, single-bit",
1103 "ECC Error, multi-bit",
1104 "Checksum Error",
1105 "DSI Data Type Not Recognized",
1106 "DSI VC ID Invalid",
1107 "Invalid Transmission Length",
1108 "Reserved",
1109 "DSI Protocol Violation",
1110 };
1111
1112 static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi,
1113 const struct mipi_dsi_msg *msg,
1114 size_t count)
1115 {
1116 u8 *rx = msg->rx_buf;
1117 unsigned int i, j, k;
1118 size_t size = 0;
1119 u16 errors;
1120 u32 value;
1121
1122 /* read and parse packet header */
1123 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1124
1125 switch (value & 0x3f) {
1126 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1127 errors = (value >> 8) & 0xffff;
1128 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n",
1129 errors);
1130 for (i = 0; i < ARRAY_SIZE(error_report); i++)
1131 if (errors & BIT(i))
1132 dev_dbg(dsi->dev, " %2u: %s\n", i,
1133 error_report[i]);
1134 break;
1135
1136 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1137 rx[0] = (value >> 8) & 0xff;
1138 size = 1;
1139 break;
1140
1141 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1142 rx[0] = (value >> 8) & 0xff;
1143 rx[1] = (value >> 16) & 0xff;
1144 size = 2;
1145 break;
1146
1147 case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
1148 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1149 break;
1150
1151 case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
1152 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1153 break;
1154
1155 default:
1156 dev_err(dsi->dev, "unhandled response type: %02x\n",
1157 value & 0x3f);
1158 return -EPROTO;
1159 }
1160
1161 size = min(size, msg->rx_len);
1162
1163 if (msg->rx_buf && size > 0) {
1164 for (i = 0, j = 0; i < count - 1; i++, j += 4) {
1165 u8 *rx = msg->rx_buf + j;
1166
1167 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1168
1169 for (k = 0; k < 4 && (j + k) < msg->rx_len; k++)
1170 rx[j + k] = (value >> (k << 3)) & 0xff;
1171 }
1172 }
1173
1174 return size;
1175 }
1176
1177 static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout)
1178 {
1179 tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER);
1180
1181 timeout = jiffies + msecs_to_jiffies(timeout);
1182
1183 while (time_before(jiffies, timeout)) {
1184 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
1185 if ((value & DSI_TRIGGER_HOST) == 0)
1186 return 0;
1187
1188 usleep_range(1000, 2000);
1189 }
1190
1191 DRM_DEBUG_KMS("timeout waiting for transmission to complete\n");
1192 return -ETIMEDOUT;
1193 }
1194
1195 static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi,
1196 unsigned long timeout)
1197 {
1198 timeout = jiffies + msecs_to_jiffies(250);
1199
1200 while (time_before(jiffies, timeout)) {
1201 u32 value = tegra_dsi_readl(dsi, DSI_STATUS);
1202 u8 count = value & 0x1f;
1203
1204 if (count > 0)
1205 return count;
1206
1207 usleep_range(1000, 2000);
1208 }
1209
1210 DRM_DEBUG_KMS("peripheral returned no data\n");
1211 return -ETIMEDOUT;
1212 }
1213
1214 static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset,
1215 const void *buffer, size_t size)
1216 {
1217 const u8 *buf = buffer;
1218 size_t i, j;
1219 u32 value;
1220
1221 for (j = 0; j < size; j += 4) {
1222 value = 0;
1223
1224 for (i = 0; i < 4 && j + i < size; i++)
1225 value |= buf[j + i] << (i << 3);
1226
1227 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1228 }
1229 }
1230
1231 static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host,
1232 const struct mipi_dsi_msg *msg)
1233 {
1234 struct tegra_dsi *dsi = host_to_tegra(host);
1235 struct mipi_dsi_packet packet;
1236 const u8 *header;
1237 size_t count;
1238 ssize_t err;
1239 u32 value;
1240
1241 err = mipi_dsi_create_packet(&packet, msg);
1242 if (err < 0)
1243 return err;
1244
1245 header = packet.header;
1246
1247 /* maximum FIFO depth is 1920 words */
1248 if (packet.size > dsi->video_fifo_depth * 4)
1249 return -ENOSPC;
1250
1251 /* reset underflow/overflow flags */
1252 value = tegra_dsi_readl(dsi, DSI_STATUS);
1253 if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) {
1254 value = DSI_HOST_CONTROL_FIFO_RESET;
1255 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1256 usleep_range(10, 20);
1257 }
1258
1259 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
1260 value |= DSI_POWER_CONTROL_ENABLE;
1261 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
1262
1263 usleep_range(5000, 10000);
1264
1265 value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST |
1266 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC;
1267
1268 if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0)
1269 value |= DSI_HOST_CONTROL_HS;
1270
1271 /*
1272 * The host FIFO has a maximum of 64 words, so larger transmissions
1273 * need to use the video FIFO.
1274 */
1275 if (packet.size > dsi->host_fifo_depth * 4)
1276 value |= DSI_HOST_CONTROL_FIFO_SEL;
1277
1278 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1279
1280 /*
1281 * For reads and messages with explicitly requested ACK, generate a
1282 * BTA sequence after the transmission of the packet.
1283 */
1284 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1285 (msg->rx_buf && msg->rx_len > 0)) {
1286 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
1287 value |= DSI_HOST_CONTROL_PKT_BTA;
1288 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1289 }
1290
1291 value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE;
1292 tegra_dsi_writel(dsi, value, DSI_CONTROL);
1293
1294 /* write packet header, ECC is generated by hardware */
1295 value = header[2] << 16 | header[1] << 8 | header[0];
1296 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1297
1298 /* write payload (if any) */
1299 if (packet.payload_length > 0)
1300 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload,
1301 packet.payload_length);
1302
1303 err = tegra_dsi_transmit(dsi, 250);
1304 if (err < 0)
1305 return err;
1306
1307 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1308 (msg->rx_buf && msg->rx_len > 0)) {
1309 err = tegra_dsi_wait_for_response(dsi, 250);
1310 if (err < 0)
1311 return err;
1312
1313 count = err;
1314
1315 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1316 switch (value) {
1317 case 0x84:
1318 /*
1319 dev_dbg(dsi->dev, "ACK\n");
1320 */
1321 break;
1322
1323 case 0x87:
1324 /*
1325 dev_dbg(dsi->dev, "ESCAPE\n");
1326 */
1327 break;
1328
1329 default:
1330 dev_err(dsi->dev, "unknown status: %08x\n", value);
1331 break;
1332 }
1333
1334 if (count > 1) {
1335 err = tegra_dsi_read_response(dsi, msg, count);
1336 if (err < 0)
1337 dev_err(dsi->dev,
1338 "failed to parse response: %zd\n",
1339 err);
1340 else {
1341 /*
1342 * For read commands, return the number of
1343 * bytes returned by the peripheral.
1344 */
1345 count = err;
1346 }
1347 }
1348 } else {
1349 /*
1350 * For write commands, we have transmitted the 4-byte header
1351 * plus the variable-length payload.
1352 */
1353 count = 4 + packet.payload_length;
1354 }
1355
1356 return count;
1357 }
1358
1359 static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi)
1360 {
1361 struct clk *parent;
1362 int err;
1363
1364 /* make sure both DSI controllers share the same PLL */
1365 parent = clk_get_parent(dsi->slave->clk);
1366 if (!parent)
1367 return -EINVAL;
1368
1369 err = clk_set_parent(parent, dsi->clk_parent);
1370 if (err < 0)
1371 return err;
1372
1373 return 0;
1374 }
1375
1376 static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
1377 struct mipi_dsi_device *device)
1378 {
1379 struct tegra_dsi *dsi = host_to_tegra(host);
1380
1381 dsi->flags = device->mode_flags;
1382 dsi->format = device->format;
1383 dsi->lanes = device->lanes;
1384
1385 if (dsi->slave) {
1386 int err;
1387
1388 dev_dbg(dsi->dev, "attaching dual-channel device %s\n",
1389 dev_name(&device->dev));
1390
1391 err = tegra_dsi_ganged_setup(dsi);
1392 if (err < 0) {
1393 dev_err(dsi->dev, "failed to set up ganged mode: %d\n",
1394 err);
1395 return err;
1396 }
1397 }
1398
1399 /*
1400 * Slaves don't have a panel associated with them, so they provide
1401 * merely the second channel.
1402 */
1403 if (!dsi->master) {
1404 struct tegra_output *output = &dsi->output;
1405
1406 output->panel = of_drm_find_panel(device->dev.of_node);
1407 if (output->panel && output->connector.dev) {
1408 drm_panel_attach(output->panel, &output->connector);
1409 drm_helper_hpd_irq_event(output->connector.dev);
1410 }
1411 }
1412
1413 return 0;
1414 }
1415
1416 static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
1417 struct mipi_dsi_device *device)
1418 {
1419 struct tegra_dsi *dsi = host_to_tegra(host);
1420 struct tegra_output *output = &dsi->output;
1421
1422 if (output->panel && &device->dev == output->panel->dev) {
1423 output->panel = NULL;
1424
1425 if (output->connector.dev)
1426 drm_helper_hpd_irq_event(output->connector.dev);
1427 }
1428
1429 return 0;
1430 }
1431
1432 static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
1433 .attach = tegra_dsi_host_attach,
1434 .detach = tegra_dsi_host_detach,
1435 .transfer = tegra_dsi_host_transfer,
1436 };
1437
1438 static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
1439 {
1440 struct device_node *np;
1441
1442 np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0);
1443 if (np) {
1444 struct platform_device *gangster = of_find_device_by_node(np);
1445
1446 dsi->slave = platform_get_drvdata(gangster);
1447 of_node_put(np);
1448
1449 if (!dsi->slave)
1450 return -EPROBE_DEFER;
1451
1452 dsi->slave->master = dsi;
1453 }
1454
1455 return 0;
1456 }
1457
1458 static int tegra_dsi_probe(struct platform_device *pdev)
1459 {
1460 struct tegra_dsi *dsi;
1461 struct resource *regs;
1462 int err;
1463
1464 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
1465 if (!dsi)
1466 return -ENOMEM;
1467
1468 dsi->output.dev = dsi->dev = &pdev->dev;
1469 dsi->video_fifo_depth = 1920;
1470 dsi->host_fifo_depth = 64;
1471
1472 err = tegra_dsi_ganged_probe(dsi);
1473 if (err < 0)
1474 return err;
1475
1476 err = tegra_output_probe(&dsi->output);
1477 if (err < 0)
1478 return err;
1479
1480 dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD;
1481
1482 /*
1483 * Assume these values by default. When a DSI peripheral driver
1484 * attaches to the DSI host, the parameters will be taken from
1485 * the attached device.
1486 */
1487 dsi->flags = MIPI_DSI_MODE_VIDEO;
1488 dsi->format = MIPI_DSI_FMT_RGB888;
1489 dsi->lanes = 4;
1490
1491 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
1492 if (IS_ERR(dsi->rst))
1493 return PTR_ERR(dsi->rst);
1494
1495 dsi->clk = devm_clk_get(&pdev->dev, NULL);
1496 if (IS_ERR(dsi->clk)) {
1497 dev_err(&pdev->dev, "cannot get DSI clock\n");
1498 err = PTR_ERR(dsi->clk);
1499 goto reset;
1500 }
1501
1502 err = clk_prepare_enable(dsi->clk);
1503 if (err < 0) {
1504 dev_err(&pdev->dev, "cannot enable DSI clock\n");
1505 goto reset;
1506 }
1507
1508 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
1509 if (IS_ERR(dsi->clk_lp)) {
1510 dev_err(&pdev->dev, "cannot get low-power clock\n");
1511 err = PTR_ERR(dsi->clk_lp);
1512 goto disable_clk;
1513 }
1514
1515 err = clk_prepare_enable(dsi->clk_lp);
1516 if (err < 0) {
1517 dev_err(&pdev->dev, "cannot enable low-power clock\n");
1518 goto disable_clk;
1519 }
1520
1521 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
1522 if (IS_ERR(dsi->clk_parent)) {
1523 dev_err(&pdev->dev, "cannot get parent clock\n");
1524 err = PTR_ERR(dsi->clk_parent);
1525 goto disable_clk_lp;
1526 }
1527
1528 dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");
1529 if (IS_ERR(dsi->vdd)) {
1530 dev_err(&pdev->dev, "cannot get VDD supply\n");
1531 err = PTR_ERR(dsi->vdd);
1532 goto disable_clk_lp;
1533 }
1534
1535 err = regulator_enable(dsi->vdd);
1536 if (err < 0) {
1537 dev_err(&pdev->dev, "cannot enable VDD supply\n");
1538 goto disable_clk_lp;
1539 }
1540
1541 err = tegra_dsi_setup_clocks(dsi);
1542 if (err < 0) {
1543 dev_err(&pdev->dev, "cannot setup clocks\n");
1544 goto disable_vdd;
1545 }
1546
1547 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1548 dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
1549 if (IS_ERR(dsi->regs)) {
1550 err = PTR_ERR(dsi->regs);
1551 goto disable_vdd;
1552 }
1553
1554 dsi->mipi = tegra_mipi_request(&pdev->dev);
1555 if (IS_ERR(dsi->mipi)) {
1556 err = PTR_ERR(dsi->mipi);
1557 goto disable_vdd;
1558 }
1559
1560 dsi->host.ops = &tegra_dsi_host_ops;
1561 dsi->host.dev = &pdev->dev;
1562
1563 err = mipi_dsi_host_register(&dsi->host);
1564 if (err < 0) {
1565 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
1566 goto mipi_free;
1567 }
1568
1569 INIT_LIST_HEAD(&dsi->client.list);
1570 dsi->client.ops = &dsi_client_ops;
1571 dsi->client.dev = &pdev->dev;
1572
1573 err = host1x_client_register(&dsi->client);
1574 if (err < 0) {
1575 dev_err(&pdev->dev, "failed to register host1x client: %d\n",
1576 err);
1577 goto unregister;
1578 }
1579
1580 platform_set_drvdata(pdev, dsi);
1581
1582 return 0;
1583
1584 unregister:
1585 mipi_dsi_host_unregister(&dsi->host);
1586 mipi_free:
1587 tegra_mipi_free(dsi->mipi);
1588 disable_vdd:
1589 regulator_disable(dsi->vdd);
1590 disable_clk_lp:
1591 clk_disable_unprepare(dsi->clk_lp);
1592 disable_clk:
1593 clk_disable_unprepare(dsi->clk);
1594 reset:
1595 reset_control_assert(dsi->rst);
1596 return err;
1597 }
1598
1599 static int tegra_dsi_remove(struct platform_device *pdev)
1600 {
1601 struct tegra_dsi *dsi = platform_get_drvdata(pdev);
1602 int err;
1603
1604 err = host1x_client_unregister(&dsi->client);
1605 if (err < 0) {
1606 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
1607 err);
1608 return err;
1609 }
1610
1611 tegra_output_remove(&dsi->output);
1612
1613 mipi_dsi_host_unregister(&dsi->host);
1614 tegra_mipi_free(dsi->mipi);
1615
1616 regulator_disable(dsi->vdd);
1617 clk_disable_unprepare(dsi->clk_lp);
1618 clk_disable_unprepare(dsi->clk);
1619 reset_control_assert(dsi->rst);
1620
1621 return 0;
1622 }
1623
1624 static const struct of_device_id tegra_dsi_of_match[] = {
1625 { .compatible = "nvidia,tegra210-dsi", },
1626 { .compatible = "nvidia,tegra132-dsi", },
1627 { .compatible = "nvidia,tegra124-dsi", },
1628 { .compatible = "nvidia,tegra114-dsi", },
1629 { },
1630 };
1631 MODULE_DEVICE_TABLE(of, tegra_dsi_of_match);
1632
1633 struct platform_driver tegra_dsi_driver = {
1634 .driver = {
1635 .name = "tegra-dsi",
1636 .of_match_table = tegra_dsi_of_match,
1637 },
1638 .probe = tegra_dsi_probe,
1639 .remove = tegra_dsi_remove,
1640 };
Linux with added FPC-III support