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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 NVIDIA Corporation
4 */
5
6#include <linux/clk.h>
7#include <linux/debugfs.h>
8#include <linux/delay.h>
9#include <linux/host1x.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/of_platform.h>
13#include <linux/platform_device.h>
14#include <linux/pm_runtime.h>
15#include <linux/regulator/consumer.h>
16#include <linux/reset.h>
17
18#include <video/mipi_display.h>
19
20#include <drm/drm_atomic_helper.h>
21#include <drm/drm_debugfs.h>
22#include <drm/drm_file.h>
23#include <drm/drm_mipi_dsi.h>
24#include <drm/drm_panel.h>
25#include <drm/drm_simple_kms_helper.h>
26
27#include "dc.h"
28#include "drm.h"
29#include "dsi.h"
30#include "mipi-phy.h"
31#include "trace.h"
32
33struct tegra_dsi_state {
34 struct drm_connector_state base;
35
36 struct mipi_dphy_timing timing;
37 unsigned long period;
38
39 unsigned int vrefresh;
40 unsigned int lanes;
41 unsigned long pclk;
42 unsigned long bclk;
43
44 enum tegra_dsi_format format;
45 unsigned int mul;
46 unsigned int div;
47};
48
49static inline struct tegra_dsi_state *
50to_dsi_state(struct drm_connector_state *state)
51{
52 return container_of(state, struct tegra_dsi_state, base);
53}
54
55struct tegra_dsi {
56 struct host1x_client client;
57 struct tegra_output output;
58 struct device *dev;
59
60 void __iomem *regs;
61
62 struct reset_control *rst;
63 struct clk *clk_parent;
64 struct clk *clk_lp;
65 struct clk *clk;
66
67 struct drm_info_list *debugfs_files;
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 int offset)
108{
109 u32 value = readl(dsi->regs + (offset << 2));
110
111 trace_dsi_readl(dsi->dev, offset, value);
112
113 return value;
114}
115
116static inline void tegra_dsi_writel(struct tegra_dsi *dsi, u32 value,
117 unsigned int offset)
118{
119 trace_dsi_writel(dsi->dev, offset, value);
120 writel(value, dsi->regs + (offset << 2));
121}
122
123#define DEBUGFS_REG32(_name) { .name = #_name, .offset = _name }
124
125static const struct debugfs_reg32 tegra_dsi_regs[] = {
126 DEBUGFS_REG32(DSI_INCR_SYNCPT),
127 DEBUGFS_REG32(DSI_INCR_SYNCPT_CONTROL),
128 DEBUGFS_REG32(DSI_INCR_SYNCPT_ERROR),
129 DEBUGFS_REG32(DSI_CTXSW),
130 DEBUGFS_REG32(DSI_RD_DATA),
131 DEBUGFS_REG32(DSI_WR_DATA),
132 DEBUGFS_REG32(DSI_POWER_CONTROL),
133 DEBUGFS_REG32(DSI_INT_ENABLE),
134 DEBUGFS_REG32(DSI_INT_STATUS),
135 DEBUGFS_REG32(DSI_INT_MASK),
136 DEBUGFS_REG32(DSI_HOST_CONTROL),
137 DEBUGFS_REG32(DSI_CONTROL),
138 DEBUGFS_REG32(DSI_SOL_DELAY),
139 DEBUGFS_REG32(DSI_MAX_THRESHOLD),
140 DEBUGFS_REG32(DSI_TRIGGER),
141 DEBUGFS_REG32(DSI_TX_CRC),
142 DEBUGFS_REG32(DSI_STATUS),
143 DEBUGFS_REG32(DSI_INIT_SEQ_CONTROL),
144 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_0),
145 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_1),
146 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_2),
147 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_3),
148 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_4),
149 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_5),
150 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_6),
151 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_7),
152 DEBUGFS_REG32(DSI_PKT_SEQ_0_LO),
153 DEBUGFS_REG32(DSI_PKT_SEQ_0_HI),
154 DEBUGFS_REG32(DSI_PKT_SEQ_1_LO),
155 DEBUGFS_REG32(DSI_PKT_SEQ_1_HI),
156 DEBUGFS_REG32(DSI_PKT_SEQ_2_LO),
157 DEBUGFS_REG32(DSI_PKT_SEQ_2_HI),
158 DEBUGFS_REG32(DSI_PKT_SEQ_3_LO),
159 DEBUGFS_REG32(DSI_PKT_SEQ_3_HI),
160 DEBUGFS_REG32(DSI_PKT_SEQ_4_LO),
161 DEBUGFS_REG32(DSI_PKT_SEQ_4_HI),
162 DEBUGFS_REG32(DSI_PKT_SEQ_5_LO),
163 DEBUGFS_REG32(DSI_PKT_SEQ_5_HI),
164 DEBUGFS_REG32(DSI_DCS_CMDS),
165 DEBUGFS_REG32(DSI_PKT_LEN_0_1),
166 DEBUGFS_REG32(DSI_PKT_LEN_2_3),
167 DEBUGFS_REG32(DSI_PKT_LEN_4_5),
168 DEBUGFS_REG32(DSI_PKT_LEN_6_7),
169 DEBUGFS_REG32(DSI_PHY_TIMING_0),
170 DEBUGFS_REG32(DSI_PHY_TIMING_1),
171 DEBUGFS_REG32(DSI_PHY_TIMING_2),
172 DEBUGFS_REG32(DSI_BTA_TIMING),
173 DEBUGFS_REG32(DSI_TIMEOUT_0),
174 DEBUGFS_REG32(DSI_TIMEOUT_1),
175 DEBUGFS_REG32(DSI_TO_TALLY),
176 DEBUGFS_REG32(DSI_PAD_CONTROL_0),
177 DEBUGFS_REG32(DSI_PAD_CONTROL_CD),
178 DEBUGFS_REG32(DSI_PAD_CD_STATUS),
179 DEBUGFS_REG32(DSI_VIDEO_MODE_CONTROL),
180 DEBUGFS_REG32(DSI_PAD_CONTROL_1),
181 DEBUGFS_REG32(DSI_PAD_CONTROL_2),
182 DEBUGFS_REG32(DSI_PAD_CONTROL_3),
183 DEBUGFS_REG32(DSI_PAD_CONTROL_4),
184 DEBUGFS_REG32(DSI_GANGED_MODE_CONTROL),
185 DEBUGFS_REG32(DSI_GANGED_MODE_START),
186 DEBUGFS_REG32(DSI_GANGED_MODE_SIZE),
187 DEBUGFS_REG32(DSI_RAW_DATA_BYTE_COUNT),
188 DEBUGFS_REG32(DSI_ULTRA_LOW_POWER_CONTROL),
189 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_8),
190 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_9),
191 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_10),
192 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_11),
193 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_12),
194 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_13),
195 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_14),
196 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_15),
197};
198
199static int tegra_dsi_show_regs(struct seq_file *s, void *data)
200{
201 struct drm_info_node *node = s->private;
202 struct tegra_dsi *dsi = node->info_ent->data;
203 struct drm_crtc *crtc = dsi->output.encoder.crtc;
204 struct drm_device *drm = node->minor->dev;
205 unsigned int i;
206 int err = 0;
207
208 drm_modeset_lock_all(drm);
209
210 if (!crtc || !crtc->state->active) {
211 err = -EBUSY;
212 goto unlock;
213 }
214
215 for (i = 0; i < ARRAY_SIZE(tegra_dsi_regs); i++) {
216 unsigned int offset = tegra_dsi_regs[i].offset;
217
218 seq_printf(s, "%-32s %#05x %08x\n", tegra_dsi_regs[i].name,
219 offset, tegra_dsi_readl(dsi, offset));
220 }
221
222unlock:
223 drm_modeset_unlock_all(drm);
224 return err;
225}
226
227static struct drm_info_list debugfs_files[] = {
228 { "regs", tegra_dsi_show_regs, 0, NULL },
229};
230
231static int tegra_dsi_late_register(struct drm_connector *connector)
232{
233 struct tegra_output *output = connector_to_output(connector);
234 unsigned int i, count = ARRAY_SIZE(debugfs_files);
235 struct drm_minor *minor = connector->dev->primary;
236 struct dentry *root = connector->debugfs_entry;
237 struct tegra_dsi *dsi = to_dsi(output);
238
239 dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
240 GFP_KERNEL);
241 if (!dsi->debugfs_files)
242 return -ENOMEM;
243
244 for (i = 0; i < count; i++)
245 dsi->debugfs_files[i].data = dsi;
246
247 drm_debugfs_create_files(dsi->debugfs_files, count, root, minor);
248
249 return 0;
250}
251
252static void tegra_dsi_early_unregister(struct drm_connector *connector)
253{
254 struct tegra_output *output = connector_to_output(connector);
255 unsigned int count = ARRAY_SIZE(debugfs_files);
256 struct tegra_dsi *dsi = to_dsi(output);
257
258 drm_debugfs_remove_files(dsi->debugfs_files, count,
259 connector->debugfs_entry,
260 connector->dev->primary);
261 kfree(dsi->debugfs_files);
262 dsi->debugfs_files = NULL;
263}
264
265#define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9))
266#define PKT_LEN0(len) (((len) & 0x07) << 0)
267#define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19))
268#define PKT_LEN1(len) (((len) & 0x07) << 10)
269#define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29))
270#define PKT_LEN2(len) (((len) & 0x07) << 20)
271
272#define PKT_LP (1 << 30)
273#define NUM_PKT_SEQ 12
274
275/*
276 * non-burst mode with sync pulses
277 */
278static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = {
279 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
280 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
281 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
282 PKT_LP,
283 [ 1] = 0,
284 [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) |
285 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
286 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
287 PKT_LP,
288 [ 3] = 0,
289 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
290 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
291 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
292 PKT_LP,
293 [ 5] = 0,
294 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
295 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
296 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
297 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
298 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
299 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
300 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
301 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
302 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
303 PKT_LP,
304 [ 9] = 0,
305 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
306 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
307 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
308 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
309 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
310 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
311};
312
313/*
314 * non-burst mode with sync events
315 */
316static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = {
317 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
318 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
319 PKT_LP,
320 [ 1] = 0,
321 [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
322 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
323 PKT_LP,
324 [ 3] = 0,
325 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
326 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
327 PKT_LP,
328 [ 5] = 0,
329 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
330 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
331 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
332 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
333 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
334 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
335 PKT_LP,
336 [ 9] = 0,
337 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
338 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
339 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
340 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
341};
342
343static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = {
344 [ 0] = 0,
345 [ 1] = 0,
346 [ 2] = 0,
347 [ 3] = 0,
348 [ 4] = 0,
349 [ 5] = 0,
350 [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP,
351 [ 7] = 0,
352 [ 8] = 0,
353 [ 9] = 0,
354 [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP,
355 [11] = 0,
356};
357
358static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi,
359 unsigned long period,
360 const struct mipi_dphy_timing *timing)
361{
362 u32 value;
363
364 value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 |
365 DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 |
366 DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 |
367 DSI_TIMING_FIELD(timing->hsprepare, period, 1);
368 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0);
369
370 value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 |
371 DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 |
372 DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 |
373 DSI_TIMING_FIELD(timing->lpx, period, 1);
374 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1);
375
376 value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 |
377 DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 |
378 DSI_TIMING_FIELD(0xff * period, period, 0) << 0;
379 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2);
380
381 value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 |
382 DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 |
383 DSI_TIMING_FIELD(timing->tago, period, 1);
384 tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);
385
386 if (dsi->slave)
387 tegra_dsi_set_phy_timing(dsi->slave, period, timing);
388}
389
390static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,
391 unsigned int *mulp, unsigned int *divp)
392{
393 switch (format) {
394 case MIPI_DSI_FMT_RGB666_PACKED:
395 case MIPI_DSI_FMT_RGB888:
396 *mulp = 3;
397 *divp = 1;
398 break;
399
400 case MIPI_DSI_FMT_RGB565:
401 *mulp = 2;
402 *divp = 1;
403 break;
404
405 case MIPI_DSI_FMT_RGB666:
406 *mulp = 9;
407 *divp = 4;
408 break;
409
410 default:
411 return -EINVAL;
412 }
413
414 return 0;
415}
416
417static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format,
418 enum tegra_dsi_format *fmt)
419{
420 switch (format) {
421 case MIPI_DSI_FMT_RGB888:
422 *fmt = TEGRA_DSI_FORMAT_24P;
423 break;
424
425 case MIPI_DSI_FMT_RGB666:
426 *fmt = TEGRA_DSI_FORMAT_18NP;
427 break;
428
429 case MIPI_DSI_FMT_RGB666_PACKED:
430 *fmt = TEGRA_DSI_FORMAT_18P;
431 break;
432
433 case MIPI_DSI_FMT_RGB565:
434 *fmt = TEGRA_DSI_FORMAT_16P;
435 break;
436
437 default:
438 return -EINVAL;
439 }
440
441 return 0;
442}
443
444static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start,
445 unsigned int size)
446{
447 u32 value;
448
449 tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START);
450 tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE);
451
452 value = DSI_GANGED_MODE_CONTROL_ENABLE;
453 tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL);
454}
455
456static void tegra_dsi_enable(struct tegra_dsi *dsi)
457{
458 u32 value;
459
460 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
461 value |= DSI_POWER_CONTROL_ENABLE;
462 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
463
464 if (dsi->slave)
465 tegra_dsi_enable(dsi->slave);
466}
467
468static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi)
469{
470 if (dsi->master)
471 return dsi->master->lanes + dsi->lanes;
472
473 if (dsi->slave)
474 return dsi->lanes + dsi->slave->lanes;
475
476 return dsi->lanes;
477}
478
479static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
480 const struct drm_display_mode *mode)
481{
482 unsigned int hact, hsw, hbp, hfp, i, mul, div;
483 struct tegra_dsi_state *state;
484 const u32 *pkt_seq;
485 u32 value;
486
487 /* XXX: pass in state into this function? */
488 if (dsi->master)
489 state = tegra_dsi_get_state(dsi->master);
490 else
491 state = tegra_dsi_get_state(dsi);
492
493 mul = state->mul;
494 div = state->div;
495
496 if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
497 DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n");
498 pkt_seq = pkt_seq_video_non_burst_sync_pulses;
499 } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
500 DRM_DEBUG_KMS("Non-burst video mode with sync events\n");
501 pkt_seq = pkt_seq_video_non_burst_sync_events;
502 } else {
503 DRM_DEBUG_KMS("Command mode\n");
504 pkt_seq = pkt_seq_command_mode;
505 }
506
507 value = DSI_CONTROL_CHANNEL(0) |
508 DSI_CONTROL_FORMAT(state->format) |
509 DSI_CONTROL_LANES(dsi->lanes - 1) |
510 DSI_CONTROL_SOURCE(pipe);
511 tegra_dsi_writel(dsi, value, DSI_CONTROL);
512
513 tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD);
514
515 value = DSI_HOST_CONTROL_HS;
516 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
517
518 value = tegra_dsi_readl(dsi, DSI_CONTROL);
519
520 if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
521 value |= DSI_CONTROL_HS_CLK_CTRL;
522
523 value &= ~DSI_CONTROL_TX_TRIG(3);
524
525 /* enable DCS commands for command mode */
526 if (dsi->flags & MIPI_DSI_MODE_VIDEO)
527 value &= ~DSI_CONTROL_DCS_ENABLE;
528 else
529 value |= DSI_CONTROL_DCS_ENABLE;
530
531 value |= DSI_CONTROL_VIDEO_ENABLE;
532 value &= ~DSI_CONTROL_HOST_ENABLE;
533 tegra_dsi_writel(dsi, value, DSI_CONTROL);
534
535 for (i = 0; i < NUM_PKT_SEQ; i++)
536 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);
537
538 if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
539 /* horizontal active pixels */
540 hact = mode->hdisplay * mul / div;
541
542 /* horizontal sync width */
543 hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
544
545 /* horizontal back porch */
546 hbp = (mode->htotal - mode->hsync_end) * mul / div;
547
548 if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
549 hbp += hsw;
550
551 /* horizontal front porch */
552 hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
553
554 /* subtract packet overhead */
555 hsw -= 10;
556 hbp -= 14;
557 hfp -= 8;
558
559 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);
560 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3);
561 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5);
562 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7);
563
564 /* set SOL delay (for non-burst mode only) */
565 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY);
566
567 /* TODO: implement ganged mode */
568 } else {
569 u16 bytes;
570
571 if (dsi->master || dsi->slave) {
572 /*
573 * For ganged mode, assume symmetric left-right mode.
574 */
575 bytes = 1 + (mode->hdisplay / 2) * mul / div;
576 } else {
577 /* 1 byte (DCS command) + pixel data */
578 bytes = 1 + mode->hdisplay * mul / div;
579 }
580
581 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1);
582 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3);
583 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5);
584 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7);
585
586 value = MIPI_DCS_WRITE_MEMORY_START << 8 |
587 MIPI_DCS_WRITE_MEMORY_CONTINUE;
588 tegra_dsi_writel(dsi, value, DSI_DCS_CMDS);
589
590 /* set SOL delay */
591 if (dsi->master || dsi->slave) {
592 unsigned long delay, bclk, bclk_ganged;
593 unsigned int lanes = state->lanes;
594
595 /* SOL to valid, valid to FIFO and FIFO write delay */
596 delay = 4 + 4 + 2;
597 delay = DIV_ROUND_UP(delay * mul, div * lanes);
598 /* FIFO read delay */
599 delay = delay + 6;
600
601 bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes);
602 bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes);
603 value = bclk - bclk_ganged + delay + 20;
604 } else {
605 /* TODO: revisit for non-ganged mode */
606 value = 8 * mul / div;
607 }
608
609 tegra_dsi_writel(dsi, value, DSI_SOL_DELAY);
610 }
611
612 if (dsi->slave) {
613 tegra_dsi_configure(dsi->slave, pipe, mode);
614
615 /*
616 * TODO: Support modes other than symmetrical left-right
617 * split.
618 */
619 tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2);
620 tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2,
621 mode->hdisplay / 2);
622 }
623}
624
625static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout)
626{
627 u32 value;
628
629 timeout = jiffies + msecs_to_jiffies(timeout);
630
631 while (time_before(jiffies, timeout)) {
632 value = tegra_dsi_readl(dsi, DSI_STATUS);
633 if (value & DSI_STATUS_IDLE)
634 return 0;
635
636 usleep_range(1000, 2000);
637 }
638
639 return -ETIMEDOUT;
640}
641
642static void tegra_dsi_video_disable(struct tegra_dsi *dsi)
643{
644 u32 value;
645
646 value = tegra_dsi_readl(dsi, DSI_CONTROL);
647 value &= ~DSI_CONTROL_VIDEO_ENABLE;
648 tegra_dsi_writel(dsi, value, DSI_CONTROL);
649
650 if (dsi->slave)
651 tegra_dsi_video_disable(dsi->slave);
652}
653
654static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi)
655{
656 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START);
657 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE);
658 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL);
659}
660
661static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
662{
663 u32 value;
664
665 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
666 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
667
668 return 0;
669}
670
671static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
672{
673 u32 value;
674 int err;
675
676 /*
677 * XXX Is this still needed? The module reset is deasserted right
678 * before this function is called.
679 */
680 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
681 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
682 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
683 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
684 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
685
686 /* start calibration */
687 tegra_dsi_pad_enable(dsi);
688
689 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
690 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
691 DSI_PAD_OUT_CLK(0x0);
692 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);
693
694 value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) |
695 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3);
696 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3);
697
698 err = tegra_mipi_start_calibration(dsi->mipi);
699 if (err < 0)
700 return err;
701
702 return tegra_mipi_finish_calibration(dsi->mipi);
703}
704
705static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk,
706 unsigned int vrefresh)
707{
708 unsigned int timeout;
709 u32 value;
710
711 /* one frame high-speed transmission timeout */
712 timeout = (bclk / vrefresh) / 512;
713 value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout);
714 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0);
715
716 /* 2 ms peripheral timeout for panel */
717 timeout = 2 * bclk / 512 * 1000;
718 value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000);
719 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1);
720
721 value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0);
722 tegra_dsi_writel(dsi, value, DSI_TO_TALLY);
723
724 if (dsi->slave)
725 tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh);
726}
727
728static void tegra_dsi_disable(struct tegra_dsi *dsi)
729{
730 u32 value;
731
732 if (dsi->slave) {
733 tegra_dsi_ganged_disable(dsi->slave);
734 tegra_dsi_ganged_disable(dsi);
735 }
736
737 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
738 value &= ~DSI_POWER_CONTROL_ENABLE;
739 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
740
741 if (dsi->slave)
742 tegra_dsi_disable(dsi->slave);
743
744 usleep_range(5000, 10000);
745}
746
747static void tegra_dsi_soft_reset(struct tegra_dsi *dsi)
748{
749 u32 value;
750
751 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
752 value &= ~DSI_POWER_CONTROL_ENABLE;
753 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
754
755 usleep_range(300, 1000);
756
757 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
758 value |= DSI_POWER_CONTROL_ENABLE;
759 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
760
761 usleep_range(300, 1000);
762
763 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
764 if (value)
765 tegra_dsi_writel(dsi, 0, DSI_TRIGGER);
766
767 if (dsi->slave)
768 tegra_dsi_soft_reset(dsi->slave);
769}
770
771static void tegra_dsi_connector_reset(struct drm_connector *connector)
772{
773 struct tegra_dsi_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
774
775 if (!state)
776 return;
777
778 if (connector->state) {
779 __drm_atomic_helper_connector_destroy_state(connector->state);
780 kfree(connector->state);
781 }
782
783 __drm_atomic_helper_connector_reset(connector, &state->base);
784}
785
786static struct drm_connector_state *
787tegra_dsi_connector_duplicate_state(struct drm_connector *connector)
788{
789 struct tegra_dsi_state *state = to_dsi_state(connector->state);
790 struct tegra_dsi_state *copy;
791
792 copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
793 if (!copy)
794 return NULL;
795
796 __drm_atomic_helper_connector_duplicate_state(connector,
797 ©->base);
798
799 return ©->base;
800}
801
802static const struct drm_connector_funcs tegra_dsi_connector_funcs = {
803 .reset = tegra_dsi_connector_reset,
804 .detect = tegra_output_connector_detect,
805 .fill_modes = drm_helper_probe_single_connector_modes,
806 .destroy = tegra_output_connector_destroy,
807 .atomic_duplicate_state = tegra_dsi_connector_duplicate_state,
808 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
809 .late_register = tegra_dsi_late_register,
810 .early_unregister = tegra_dsi_early_unregister,
811};
812
813static enum drm_mode_status
814tegra_dsi_connector_mode_valid(struct drm_connector *connector,
815 struct drm_display_mode *mode)
816{
817 return MODE_OK;
818}
819
820static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = {
821 .get_modes = tegra_output_connector_get_modes,
822 .mode_valid = tegra_dsi_connector_mode_valid,
823};
824
825static void tegra_dsi_unprepare(struct tegra_dsi *dsi)
826{
827 int err;
828
829 if (dsi->slave)
830 tegra_dsi_unprepare(dsi->slave);
831
832 err = tegra_mipi_disable(dsi->mipi);
833 if (err < 0)
834 dev_err(dsi->dev, "failed to disable MIPI calibration: %d\n",
835 err);
836
837 err = host1x_client_suspend(&dsi->client);
838 if (err < 0)
839 dev_err(dsi->dev, "failed to suspend: %d\n", err);
840}
841
842static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
843{
844 struct tegra_output *output = encoder_to_output(encoder);
845 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
846 struct tegra_dsi *dsi = to_dsi(output);
847 u32 value;
848 int err;
849
850 if (output->panel)
851 drm_panel_disable(output->panel);
852
853 tegra_dsi_video_disable(dsi);
854
855 /*
856 * The following accesses registers of the display controller, so make
857 * sure it's only executed when the output is attached to one.
858 */
859 if (dc) {
860 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
861 value &= ~DSI_ENABLE;
862 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
863
864 tegra_dc_commit(dc);
865 }
866
867 err = tegra_dsi_wait_idle(dsi, 100);
868 if (err < 0)
869 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err);
870
871 tegra_dsi_soft_reset(dsi);
872
873 if (output->panel)
874 drm_panel_unprepare(output->panel);
875
876 tegra_dsi_disable(dsi);
877
878 tegra_dsi_unprepare(dsi);
879}
880
881static int tegra_dsi_prepare(struct tegra_dsi *dsi)
882{
883 int err;
884
885 err = host1x_client_resume(&dsi->client);
886 if (err < 0) {
887 dev_err(dsi->dev, "failed to resume: %d\n", err);
888 return err;
889 }
890
891 err = tegra_mipi_enable(dsi->mipi);
892 if (err < 0)
893 dev_err(dsi->dev, "failed to enable MIPI calibration: %d\n",
894 err);
895
896 err = tegra_dsi_pad_calibrate(dsi);
897 if (err < 0)
898 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
899
900 if (dsi->slave)
901 tegra_dsi_prepare(dsi->slave);
902
903 return 0;
904}
905
906static void tegra_dsi_encoder_enable(struct drm_encoder *encoder)
907{
908 struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
909 struct tegra_output *output = encoder_to_output(encoder);
910 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
911 struct tegra_dsi *dsi = to_dsi(output);
912 struct tegra_dsi_state *state;
913 u32 value;
914 int err;
915
916 /* If the bootloader enabled DSI it needs to be disabled
917 * in order for the panel initialization commands to be
918 * properly sent.
919 */
920 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
921
922 if (value & DSI_POWER_CONTROL_ENABLE)
923 tegra_dsi_disable(dsi);
924
925 err = tegra_dsi_prepare(dsi);
926 if (err < 0) {
927 dev_err(dsi->dev, "failed to prepare: %d\n", err);
928 return;
929 }
930
931 state = tegra_dsi_get_state(dsi);
932
933 tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh);
934
935 /*
936 * The D-PHY timing fields are expressed in byte-clock cycles, so
937 * multiply the period by 8.
938 */
939 tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing);
940
941 if (output->panel)
942 drm_panel_prepare(output->panel);
943
944 tegra_dsi_configure(dsi, dc->pipe, mode);
945
946 /* enable display controller */
947 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
948 value |= DSI_ENABLE;
949 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
950
951 tegra_dc_commit(dc);
952
953 /* enable DSI controller */
954 tegra_dsi_enable(dsi);
955
956 if (output->panel)
957 drm_panel_enable(output->panel);
958}
959
960static int
961tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder,
962 struct drm_crtc_state *crtc_state,
963 struct drm_connector_state *conn_state)
964{
965 struct tegra_output *output = encoder_to_output(encoder);
966 struct tegra_dsi_state *state = to_dsi_state(conn_state);
967 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc);
968 struct tegra_dsi *dsi = to_dsi(output);
969 unsigned int scdiv;
970 unsigned long plld;
971 int err;
972
973 state->pclk = crtc_state->mode.clock * 1000;
974
975 err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div);
976 if (err < 0)
977 return err;
978
979 state->lanes = tegra_dsi_get_lanes(dsi);
980
981 err = tegra_dsi_get_format(dsi->format, &state->format);
982 if (err < 0)
983 return err;
984
985 state->vrefresh = drm_mode_vrefresh(&crtc_state->mode);
986
987 /* compute byte clock */
988 state->bclk = (state->pclk * state->mul) / (state->div * state->lanes);
989
990 DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div,
991 state->lanes);
992 DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format,
993 state->vrefresh);
994 DRM_DEBUG_KMS("bclk: %lu\n", state->bclk);
995
996 /*
997 * Compute bit clock and round up to the next MHz.
998 */
999 plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC;
1000 state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld);
1001
1002 err = mipi_dphy_timing_get_default(&state->timing, state->period);
1003 if (err < 0)
1004 return err;
1005
1006 err = mipi_dphy_timing_validate(&state->timing, state->period);
1007 if (err < 0) {
1008 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
1009 return err;
1010 }
1011
1012 /*
1013 * We divide the frequency by two here, but we make up for that by
1014 * setting the shift clock divider (further below) to half of the
1015 * correct value.
1016 */
1017 plld /= 2;
1018
1019 /*
1020 * Derive pixel clock from bit clock using the shift clock divider.
1021 * Note that this is only half of what we would expect, but we need
1022 * that to make up for the fact that we divided the bit clock by a
1023 * factor of two above.
1024 *
1025 * It's not clear exactly why this is necessary, but the display is
1026 * not working properly otherwise. Perhaps the PLLs cannot generate
1027 * frequencies sufficiently high.
1028 */
1029 scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2;
1030
1031 err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent,
1032 plld, scdiv);
1033 if (err < 0) {
1034 dev_err(output->dev, "failed to setup CRTC state: %d\n", err);
1035 return err;
1036 }
1037
1038 return err;
1039}
1040
1041static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = {
1042 .disable = tegra_dsi_encoder_disable,
1043 .enable = tegra_dsi_encoder_enable,
1044 .atomic_check = tegra_dsi_encoder_atomic_check,
1045};
1046
1047static int tegra_dsi_init(struct host1x_client *client)
1048{
1049 struct drm_device *drm = dev_get_drvdata(client->host);
1050 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1051 int err;
1052
1053 /* Gangsters must not register their own outputs. */
1054 if (!dsi->master) {
1055 dsi->output.dev = client->dev;
1056
1057 drm_connector_init(drm, &dsi->output.connector,
1058 &tegra_dsi_connector_funcs,
1059 DRM_MODE_CONNECTOR_DSI);
1060 drm_connector_helper_add(&dsi->output.connector,
1061 &tegra_dsi_connector_helper_funcs);
1062 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF;
1063
1064 drm_simple_encoder_init(drm, &dsi->output.encoder,
1065 DRM_MODE_ENCODER_DSI);
1066 drm_encoder_helper_add(&dsi->output.encoder,
1067 &tegra_dsi_encoder_helper_funcs);
1068
1069 drm_connector_attach_encoder(&dsi->output.connector,
1070 &dsi->output.encoder);
1071 drm_connector_register(&dsi->output.connector);
1072
1073 err = tegra_output_init(drm, &dsi->output);
1074 if (err < 0)
1075 dev_err(dsi->dev, "failed to initialize output: %d\n",
1076 err);
1077
1078 dsi->output.encoder.possible_crtcs = 0x3;
1079 }
1080
1081 return 0;
1082}
1083
1084static int tegra_dsi_exit(struct host1x_client *client)
1085{
1086 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1087
1088 tegra_output_exit(&dsi->output);
1089
1090 return 0;
1091}
1092
1093static int tegra_dsi_runtime_suspend(struct host1x_client *client)
1094{
1095 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1096 struct device *dev = client->dev;
1097 int err;
1098
1099 if (dsi->rst) {
1100 err = reset_control_assert(dsi->rst);
1101 if (err < 0) {
1102 dev_err(dev, "failed to assert reset: %d\n", err);
1103 return err;
1104 }
1105 }
1106
1107 usleep_range(1000, 2000);
1108
1109 clk_disable_unprepare(dsi->clk_lp);
1110 clk_disable_unprepare(dsi->clk);
1111
1112 regulator_disable(dsi->vdd);
1113 pm_runtime_put_sync(dev);
1114
1115 return 0;
1116}
1117
1118static int tegra_dsi_runtime_resume(struct host1x_client *client)
1119{
1120 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1121 struct device *dev = client->dev;
1122 int err;
1123
1124 err = pm_runtime_resume_and_get(dev);
1125 if (err < 0) {
1126 dev_err(dev, "failed to get runtime PM: %d\n", err);
1127 return err;
1128 }
1129
1130 err = regulator_enable(dsi->vdd);
1131 if (err < 0) {
1132 dev_err(dev, "failed to enable VDD supply: %d\n", err);
1133 goto put_rpm;
1134 }
1135
1136 err = clk_prepare_enable(dsi->clk);
1137 if (err < 0) {
1138 dev_err(dev, "cannot enable DSI clock: %d\n", err);
1139 goto disable_vdd;
1140 }
1141
1142 err = clk_prepare_enable(dsi->clk_lp);
1143 if (err < 0) {
1144 dev_err(dev, "cannot enable low-power clock: %d\n", err);
1145 goto disable_clk;
1146 }
1147
1148 usleep_range(1000, 2000);
1149
1150 if (dsi->rst) {
1151 err = reset_control_deassert(dsi->rst);
1152 if (err < 0) {
1153 dev_err(dev, "cannot assert reset: %d\n", err);
1154 goto disable_clk_lp;
1155 }
1156 }
1157
1158 return 0;
1159
1160disable_clk_lp:
1161 clk_disable_unprepare(dsi->clk_lp);
1162disable_clk:
1163 clk_disable_unprepare(dsi->clk);
1164disable_vdd:
1165 regulator_disable(dsi->vdd);
1166put_rpm:
1167 pm_runtime_put_sync(dev);
1168 return err;
1169}
1170
1171static const struct host1x_client_ops dsi_client_ops = {
1172 .init = tegra_dsi_init,
1173 .exit = tegra_dsi_exit,
1174 .suspend = tegra_dsi_runtime_suspend,
1175 .resume = tegra_dsi_runtime_resume,
1176};
1177
1178static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
1179{
1180 struct clk *parent;
1181 int err;
1182
1183 parent = clk_get_parent(dsi->clk);
1184 if (!parent)
1185 return -EINVAL;
1186
1187 err = clk_set_parent(parent, dsi->clk_parent);
1188 if (err < 0)
1189 return err;
1190
1191 return 0;
1192}
1193
1194static const char * const error_report[16] = {
1195 "SoT Error",
1196 "SoT Sync Error",
1197 "EoT Sync Error",
1198 "Escape Mode Entry Command Error",
1199 "Low-Power Transmit Sync Error",
1200 "Peripheral Timeout Error",
1201 "False Control Error",
1202 "Contention Detected",
1203 "ECC Error, single-bit",
1204 "ECC Error, multi-bit",
1205 "Checksum Error",
1206 "DSI Data Type Not Recognized",
1207 "DSI VC ID Invalid",
1208 "Invalid Transmission Length",
1209 "Reserved",
1210 "DSI Protocol Violation",
1211};
1212
1213static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi,
1214 const struct mipi_dsi_msg *msg,
1215 size_t count)
1216{
1217 u8 *rx = msg->rx_buf;
1218 unsigned int i, j, k;
1219 size_t size = 0;
1220 u16 errors;
1221 u32 value;
1222
1223 /* read and parse packet header */
1224 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1225
1226 switch (value & 0x3f) {
1227 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1228 errors = (value >> 8) & 0xffff;
1229 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n",
1230 errors);
1231 for (i = 0; i < ARRAY_SIZE(error_report); i++)
1232 if (errors & BIT(i))
1233 dev_dbg(dsi->dev, " %2u: %s\n", i,
1234 error_report[i]);
1235 break;
1236
1237 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1238 rx[0] = (value >> 8) & 0xff;
1239 size = 1;
1240 break;
1241
1242 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1243 rx[0] = (value >> 8) & 0xff;
1244 rx[1] = (value >> 16) & 0xff;
1245 size = 2;
1246 break;
1247
1248 case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
1249 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1250 break;
1251
1252 case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
1253 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1254 break;
1255
1256 default:
1257 dev_err(dsi->dev, "unhandled response type: %02x\n",
1258 value & 0x3f);
1259 return -EPROTO;
1260 }
1261
1262 size = min(size, msg->rx_len);
1263
1264 if (msg->rx_buf && size > 0) {
1265 for (i = 0, j = 0; i < count - 1; i++, j += 4) {
1266 u8 *rx = msg->rx_buf + j;
1267
1268 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1269
1270 for (k = 0; k < 4 && (j + k) < msg->rx_len; k++)
1271 rx[j + k] = (value >> (k << 3)) & 0xff;
1272 }
1273 }
1274
1275 return size;
1276}
1277
1278static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout)
1279{
1280 tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER);
1281
1282 timeout = jiffies + msecs_to_jiffies(timeout);
1283
1284 while (time_before(jiffies, timeout)) {
1285 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
1286 if ((value & DSI_TRIGGER_HOST) == 0)
1287 return 0;
1288
1289 usleep_range(1000, 2000);
1290 }
1291
1292 DRM_DEBUG_KMS("timeout waiting for transmission to complete\n");
1293 return -ETIMEDOUT;
1294}
1295
1296static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi,
1297 unsigned long timeout)
1298{
1299 timeout = jiffies + msecs_to_jiffies(250);
1300
1301 while (time_before(jiffies, timeout)) {
1302 u32 value = tegra_dsi_readl(dsi, DSI_STATUS);
1303 u8 count = value & 0x1f;
1304
1305 if (count > 0)
1306 return count;
1307
1308 usleep_range(1000, 2000);
1309 }
1310
1311 DRM_DEBUG_KMS("peripheral returned no data\n");
1312 return -ETIMEDOUT;
1313}
1314
1315static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset,
1316 const void *buffer, size_t size)
1317{
1318 const u8 *buf = buffer;
1319 size_t i, j;
1320 u32 value;
1321
1322 for (j = 0; j < size; j += 4) {
1323 value = 0;
1324
1325 for (i = 0; i < 4 && j + i < size; i++)
1326 value |= buf[j + i] << (i << 3);
1327
1328 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1329 }
1330}
1331
1332static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host,
1333 const struct mipi_dsi_msg *msg)
1334{
1335 struct tegra_dsi *dsi = host_to_tegra(host);
1336 struct mipi_dsi_packet packet;
1337 const u8 *header;
1338 size_t count;
1339 ssize_t err;
1340 u32 value;
1341
1342 err = mipi_dsi_create_packet(&packet, msg);
1343 if (err < 0)
1344 return err;
1345
1346 header = packet.header;
1347
1348 /* maximum FIFO depth is 1920 words */
1349 if (packet.size > dsi->video_fifo_depth * 4)
1350 return -ENOSPC;
1351
1352 /* reset underflow/overflow flags */
1353 value = tegra_dsi_readl(dsi, DSI_STATUS);
1354 if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) {
1355 value = DSI_HOST_CONTROL_FIFO_RESET;
1356 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1357 usleep_range(10, 20);
1358 }
1359
1360 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
1361 value |= DSI_POWER_CONTROL_ENABLE;
1362 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
1363
1364 usleep_range(5000, 10000);
1365
1366 value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST |
1367 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC;
1368
1369 if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0)
1370 value |= DSI_HOST_CONTROL_HS;
1371
1372 /*
1373 * The host FIFO has a maximum of 64 words, so larger transmissions
1374 * need to use the video FIFO.
1375 */
1376 if (packet.size > dsi->host_fifo_depth * 4)
1377 value |= DSI_HOST_CONTROL_FIFO_SEL;
1378
1379 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1380
1381 /*
1382 * For reads and messages with explicitly requested ACK, generate a
1383 * BTA sequence after the transmission of the packet.
1384 */
1385 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1386 (msg->rx_buf && msg->rx_len > 0)) {
1387 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
1388 value |= DSI_HOST_CONTROL_PKT_BTA;
1389 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1390 }
1391
1392 value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE;
1393 tegra_dsi_writel(dsi, value, DSI_CONTROL);
1394
1395 /* write packet header, ECC is generated by hardware */
1396 value = header[2] << 16 | header[1] << 8 | header[0];
1397 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1398
1399 /* write payload (if any) */
1400 if (packet.payload_length > 0)
1401 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload,
1402 packet.payload_length);
1403
1404 err = tegra_dsi_transmit(dsi, 250);
1405 if (err < 0)
1406 return err;
1407
1408 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1409 (msg->rx_buf && msg->rx_len > 0)) {
1410 err = tegra_dsi_wait_for_response(dsi, 250);
1411 if (err < 0)
1412 return err;
1413
1414 count = err;
1415
1416 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1417 switch (value) {
1418 case 0x84:
1419 /*
1420 dev_dbg(dsi->dev, "ACK\n");
1421 */
1422 break;
1423
1424 case 0x87:
1425 /*
1426 dev_dbg(dsi->dev, "ESCAPE\n");
1427 */
1428 break;
1429
1430 default:
1431 dev_err(dsi->dev, "unknown status: %08x\n", value);
1432 break;
1433 }
1434
1435 if (count > 1) {
1436 err = tegra_dsi_read_response(dsi, msg, count);
1437 if (err < 0)
1438 dev_err(dsi->dev,
1439 "failed to parse response: %zd\n",
1440 err);
1441 else {
1442 /*
1443 * For read commands, return the number of
1444 * bytes returned by the peripheral.
1445 */
1446 count = err;
1447 }
1448 }
1449 } else {
1450 /*
1451 * For write commands, we have transmitted the 4-byte header
1452 * plus the variable-length payload.
1453 */
1454 count = 4 + packet.payload_length;
1455 }
1456
1457 return count;
1458}
1459
1460static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi)
1461{
1462 struct clk *parent;
1463 int err;
1464
1465 /* make sure both DSI controllers share the same PLL */
1466 parent = clk_get_parent(dsi->slave->clk);
1467 if (!parent)
1468 return -EINVAL;
1469
1470 err = clk_set_parent(parent, dsi->clk_parent);
1471 if (err < 0)
1472 return err;
1473
1474 return 0;
1475}
1476
1477static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
1478 struct mipi_dsi_device *device)
1479{
1480 struct tegra_dsi *dsi = host_to_tegra(host);
1481
1482 dsi->flags = device->mode_flags;
1483 dsi->format = device->format;
1484 dsi->lanes = device->lanes;
1485
1486 if (dsi->slave) {
1487 int err;
1488
1489 dev_dbg(dsi->dev, "attaching dual-channel device %s\n",
1490 dev_name(&device->dev));
1491
1492 err = tegra_dsi_ganged_setup(dsi);
1493 if (err < 0) {
1494 dev_err(dsi->dev, "failed to set up ganged mode: %d\n",
1495 err);
1496 return err;
1497 }
1498 }
1499
1500 /*
1501 * Slaves don't have a panel associated with them, so they provide
1502 * merely the second channel.
1503 */
1504 if (!dsi->master) {
1505 struct tegra_output *output = &dsi->output;
1506
1507 output->panel = of_drm_find_panel(device->dev.of_node);
1508 if (IS_ERR(output->panel))
1509 output->panel = NULL;
1510
1511 if (output->panel && output->connector.dev)
1512 drm_helper_hpd_irq_event(output->connector.dev);
1513 }
1514
1515 return 0;
1516}
1517
1518static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
1519 struct mipi_dsi_device *device)
1520{
1521 struct tegra_dsi *dsi = host_to_tegra(host);
1522 struct tegra_output *output = &dsi->output;
1523
1524 if (output->panel && &device->dev == output->panel->dev) {
1525 output->panel = NULL;
1526
1527 if (output->connector.dev)
1528 drm_helper_hpd_irq_event(output->connector.dev);
1529 }
1530
1531 return 0;
1532}
1533
1534static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
1535 .attach = tegra_dsi_host_attach,
1536 .detach = tegra_dsi_host_detach,
1537 .transfer = tegra_dsi_host_transfer,
1538};
1539
1540static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
1541{
1542 struct device_node *np;
1543
1544 np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0);
1545 if (np) {
1546 struct platform_device *gangster = of_find_device_by_node(np);
1547
1548 dsi->slave = platform_get_drvdata(gangster);
1549 of_node_put(np);
1550
1551 if (!dsi->slave) {
1552 put_device(&gangster->dev);
1553 return -EPROBE_DEFER;
1554 }
1555
1556 dsi->slave->master = dsi;
1557 }
1558
1559 return 0;
1560}
1561
1562static int tegra_dsi_probe(struct platform_device *pdev)
1563{
1564 struct tegra_dsi *dsi;
1565 struct resource *regs;
1566 int err;
1567
1568 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
1569 if (!dsi)
1570 return -ENOMEM;
1571
1572 dsi->output.dev = dsi->dev = &pdev->dev;
1573 dsi->video_fifo_depth = 1920;
1574 dsi->host_fifo_depth = 64;
1575
1576 err = tegra_dsi_ganged_probe(dsi);
1577 if (err < 0)
1578 return err;
1579
1580 err = tegra_output_probe(&dsi->output);
1581 if (err < 0)
1582 return err;
1583
1584 dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD;
1585
1586 /*
1587 * Assume these values by default. When a DSI peripheral driver
1588 * attaches to the DSI host, the parameters will be taken from
1589 * the attached device.
1590 */
1591 dsi->flags = MIPI_DSI_MODE_VIDEO;
1592 dsi->format = MIPI_DSI_FMT_RGB888;
1593 dsi->lanes = 4;
1594
1595 if (!pdev->dev.pm_domain) {
1596 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
1597 if (IS_ERR(dsi->rst))
1598 return PTR_ERR(dsi->rst);
1599 }
1600
1601 dsi->clk = devm_clk_get(&pdev->dev, NULL);
1602 if (IS_ERR(dsi->clk))
1603 return dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk),
1604 "cannot get DSI clock\n");
1605
1606 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
1607 if (IS_ERR(dsi->clk_lp))
1608 return dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk_lp),
1609 "cannot get low-power clock\n");
1610
1611 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
1612 if (IS_ERR(dsi->clk_parent))
1613 return dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk_parent),
1614 "cannot get parent clock\n");
1615
1616 dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");
1617 if (IS_ERR(dsi->vdd))
1618 return dev_err_probe(&pdev->dev, PTR_ERR(dsi->vdd),
1619 "cannot get VDD supply\n");
1620
1621 err = tegra_dsi_setup_clocks(dsi);
1622 if (err < 0) {
1623 dev_err(&pdev->dev, "cannot setup clocks\n");
1624 return err;
1625 }
1626
1627 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1628 dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
1629 if (IS_ERR(dsi->regs))
1630 return PTR_ERR(dsi->regs);
1631
1632 dsi->mipi = tegra_mipi_request(&pdev->dev, pdev->dev.of_node);
1633 if (IS_ERR(dsi->mipi))
1634 return PTR_ERR(dsi->mipi);
1635
1636 dsi->host.ops = &tegra_dsi_host_ops;
1637 dsi->host.dev = &pdev->dev;
1638
1639 err = mipi_dsi_host_register(&dsi->host);
1640 if (err < 0) {
1641 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
1642 goto mipi_free;
1643 }
1644
1645 platform_set_drvdata(pdev, dsi);
1646 pm_runtime_enable(&pdev->dev);
1647
1648 INIT_LIST_HEAD(&dsi->client.list);
1649 dsi->client.ops = &dsi_client_ops;
1650 dsi->client.dev = &pdev->dev;
1651
1652 err = host1x_client_register(&dsi->client);
1653 if (err < 0) {
1654 dev_err(&pdev->dev, "failed to register host1x client: %d\n",
1655 err);
1656 goto unregister;
1657 }
1658
1659 return 0;
1660
1661unregister:
1662 mipi_dsi_host_unregister(&dsi->host);
1663mipi_free:
1664 tegra_mipi_free(dsi->mipi);
1665 return err;
1666}
1667
1668static void tegra_dsi_remove(struct platform_device *pdev)
1669{
1670 struct tegra_dsi *dsi = platform_get_drvdata(pdev);
1671
1672 pm_runtime_disable(&pdev->dev);
1673
1674 host1x_client_unregister(&dsi->client);
1675
1676 tegra_output_remove(&dsi->output);
1677
1678 mipi_dsi_host_unregister(&dsi->host);
1679 tegra_mipi_free(dsi->mipi);
1680}
1681
1682static const struct of_device_id tegra_dsi_of_match[] = {
1683 { .compatible = "nvidia,tegra210-dsi", },
1684 { .compatible = "nvidia,tegra132-dsi", },
1685 { .compatible = "nvidia,tegra124-dsi", },
1686 { .compatible = "nvidia,tegra114-dsi", },
1687 { },
1688};
1689MODULE_DEVICE_TABLE(of, tegra_dsi_of_match);
1690
1691struct platform_driver tegra_dsi_driver = {
1692 .driver = {
1693 .name = "tegra-dsi",
1694 .of_match_table = tegra_dsi_of_match,
1695 },
1696 .probe = tegra_dsi_probe,
1697 .remove_new = tegra_dsi_remove,
1698};