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drm/msm/hdmi: Enable HPD after HDMI IRQ is set up
[linux/fpc-iii.git] / drivers / gpu / drm / tegra / dsi.c
blobee6ca8fa1c6554d89b5f0ff0c8cb35f8bb09a5ab
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/pm_runtime.h>
17 #include <linux/reset.h>
18
19 #include <linux/regulator/consumer.h>
20
21 #include <drm/drm_atomic_helper.h>
22 #include <drm/drm_mipi_dsi.h>
23 #include <drm/drm_panel.h>
24
25 #include <video/mipi_display.h>
26
27 #include "dc.h"
28 #include "drm.h"
29 #include "dsi.h"
30 #include "mipi-phy.h"
31 #include "trace.h"
32
33 struct 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
49 static inline struct tegra_dsi_state *
50 to_dsi_state(struct drm_connector_state *state)
51 {
52 return container_of(state, struct tegra_dsi_state, base);
53 }
54
55 struct 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
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 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
116 static 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
125 static 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
199 static 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
222 unlock:
223 drm_modeset_unlock_all(drm);
224 return err;
225 }
226
227 static struct drm_info_list debugfs_files[] = {
228 { "regs", tegra_dsi_show_regs, 0, NULL },
229 };
230
231 static 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 int err;
239
240 dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
241 GFP_KERNEL);
242 if (!dsi->debugfs_files)
243 return -ENOMEM;
244
245 for (i = 0; i < count; i++)
246 dsi->debugfs_files[i].data = dsi;
247
248 err = drm_debugfs_create_files(dsi->debugfs_files, count, root, minor);
249 if (err < 0)
250 goto free;
251
252 return 0;
253
254 free:
255 kfree(dsi->debugfs_files);
256 dsi->debugfs_files = NULL;
257
258 return err;
259 }
260
261 static void tegra_dsi_early_unregister(struct drm_connector *connector)
262 {
263 struct tegra_output *output = connector_to_output(connector);
264 unsigned int count = ARRAY_SIZE(debugfs_files);
265 struct tegra_dsi *dsi = to_dsi(output);
266
267 drm_debugfs_remove_files(dsi->debugfs_files, count,
268 connector->dev->primary);
269 kfree(dsi->debugfs_files);
270 dsi->debugfs_files = NULL;
271 }
272
273 #define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9))
274 #define PKT_LEN0(len) (((len) & 0x07) << 0)
275 #define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19))
276 #define PKT_LEN1(len) (((len) & 0x07) << 10)
277 #define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29))
278 #define PKT_LEN2(len) (((len) & 0x07) << 20)
279
280 #define PKT_LP (1 << 30)
281 #define NUM_PKT_SEQ 12
282
283 /*
284 * non-burst mode with sync pulses
285 */
286 static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = {
287 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
288 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
289 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
290 PKT_LP,
291 [ 1] = 0,
292 [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) |
293 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
294 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
295 PKT_LP,
296 [ 3] = 0,
297 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
298 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
299 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
300 PKT_LP,
301 [ 5] = 0,
302 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
303 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
304 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
305 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
306 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
307 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
308 [ 8] = 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 [ 9] = 0,
313 [10] = 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 [11] = 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 };
320
321 /*
322 * non-burst mode with sync events
323 */
324 static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = {
325 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
326 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
327 PKT_LP,
328 [ 1] = 0,
329 [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
330 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
331 PKT_LP,
332 [ 3] = 0,
333 [ 4] = 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 [ 5] = 0,
337 [ 6] = 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 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
341 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
342 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
343 PKT_LP,
344 [ 9] = 0,
345 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
346 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
347 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
348 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
349 };
350
351 static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = {
352 [ 0] = 0,
353 [ 1] = 0,
354 [ 2] = 0,
355 [ 3] = 0,
356 [ 4] = 0,
357 [ 5] = 0,
358 [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP,
359 [ 7] = 0,
360 [ 8] = 0,
361 [ 9] = 0,
362 [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP,
363 [11] = 0,
364 };
365
366 static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi,
367 unsigned long period,
368 const struct mipi_dphy_timing *timing)
369 {
370 u32 value;
371
372 value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 |
373 DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 |
374 DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 |
375 DSI_TIMING_FIELD(timing->hsprepare, period, 1);
376 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0);
377
378 value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 |
379 DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 |
380 DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 |
381 DSI_TIMING_FIELD(timing->lpx, period, 1);
382 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1);
383
384 value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 |
385 DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 |
386 DSI_TIMING_FIELD(0xff * period, period, 0) << 0;
387 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2);
388
389 value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 |
390 DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 |
391 DSI_TIMING_FIELD(timing->tago, period, 1);
392 tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);
393
394 if (dsi->slave)
395 tegra_dsi_set_phy_timing(dsi->slave, period, timing);
396 }
397
398 static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,
399 unsigned int *mulp, unsigned int *divp)
400 {
401 switch (format) {
402 case MIPI_DSI_FMT_RGB666_PACKED:
403 case MIPI_DSI_FMT_RGB888:
404 *mulp = 3;
405 *divp = 1;
406 break;
407
408 case MIPI_DSI_FMT_RGB565:
409 *mulp = 2;
410 *divp = 1;
411 break;
412
413 case MIPI_DSI_FMT_RGB666:
414 *mulp = 9;
415 *divp = 4;
416 break;
417
418 default:
419 return -EINVAL;
420 }
421
422 return 0;
423 }
424
425 static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format,
426 enum tegra_dsi_format *fmt)
427 {
428 switch (format) {
429 case MIPI_DSI_FMT_RGB888:
430 *fmt = TEGRA_DSI_FORMAT_24P;
431 break;
432
433 case MIPI_DSI_FMT_RGB666:
434 *fmt = TEGRA_DSI_FORMAT_18NP;
435 break;
436
437 case MIPI_DSI_FMT_RGB666_PACKED:
438 *fmt = TEGRA_DSI_FORMAT_18P;
439 break;
440
441 case MIPI_DSI_FMT_RGB565:
442 *fmt = TEGRA_DSI_FORMAT_16P;
443 break;
444
445 default:
446 return -EINVAL;
447 }
448
449 return 0;
450 }
451
452 static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start,
453 unsigned int size)
454 {
455 u32 value;
456
457 tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START);
458 tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE);
459
460 value = DSI_GANGED_MODE_CONTROL_ENABLE;
461 tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL);
462 }
463
464 static void tegra_dsi_enable(struct tegra_dsi *dsi)
465 {
466 u32 value;
467
468 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
469 value |= DSI_POWER_CONTROL_ENABLE;
470 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
471
472 if (dsi->slave)
473 tegra_dsi_enable(dsi->slave);
474 }
475
476 static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi)
477 {
478 if (dsi->master)
479 return dsi->master->lanes + dsi->lanes;
480
481 if (dsi->slave)
482 return dsi->lanes + dsi->slave->lanes;
483
484 return dsi->lanes;
485 }
486
487 static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
488 const struct drm_display_mode *mode)
489 {
490 unsigned int hact, hsw, hbp, hfp, i, mul, div;
491 struct tegra_dsi_state *state;
492 const u32 *pkt_seq;
493 u32 value;
494
495 /* XXX: pass in state into this function? */
496 if (dsi->master)
497 state = tegra_dsi_get_state(dsi->master);
498 else
499 state = tegra_dsi_get_state(dsi);
500
501 mul = state->mul;
502 div = state->div;
503
504 if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
505 DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n");
506 pkt_seq = pkt_seq_video_non_burst_sync_pulses;
507 } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
508 DRM_DEBUG_KMS("Non-burst video mode with sync events\n");
509 pkt_seq = pkt_seq_video_non_burst_sync_events;
510 } else {
511 DRM_DEBUG_KMS("Command mode\n");
512 pkt_seq = pkt_seq_command_mode;
513 }
514
515 value = DSI_CONTROL_CHANNEL(0) |
516 DSI_CONTROL_FORMAT(state->format) |
517 DSI_CONTROL_LANES(dsi->lanes - 1) |
518 DSI_CONTROL_SOURCE(pipe);
519 tegra_dsi_writel(dsi, value, DSI_CONTROL);
520
521 tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD);
522
523 value = DSI_HOST_CONTROL_HS;
524 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
525
526 value = tegra_dsi_readl(dsi, DSI_CONTROL);
527
528 if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
529 value |= DSI_CONTROL_HS_CLK_CTRL;
530
531 value &= ~DSI_CONTROL_TX_TRIG(3);
532
533 /* enable DCS commands for command mode */
534 if (dsi->flags & MIPI_DSI_MODE_VIDEO)
535 value &= ~DSI_CONTROL_DCS_ENABLE;
536 else
537 value |= DSI_CONTROL_DCS_ENABLE;
538
539 value |= DSI_CONTROL_VIDEO_ENABLE;
540 value &= ~DSI_CONTROL_HOST_ENABLE;
541 tegra_dsi_writel(dsi, value, DSI_CONTROL);
542
543 for (i = 0; i < NUM_PKT_SEQ; i++)
544 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);
545
546 if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
547 /* horizontal active pixels */
548 hact = mode->hdisplay * mul / div;
549
550 /* horizontal sync width */
551 hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
552
553 /* horizontal back porch */
554 hbp = (mode->htotal - mode->hsync_end) * mul / div;
555
556 if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
557 hbp += hsw;
558
559 /* horizontal front porch */
560 hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
561
562 /* subtract packet overhead */
563 hsw -= 10;
564 hbp -= 14;
565 hfp -= 8;
566
567 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);
568 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3);
569 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5);
570 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7);
571
572 /* set SOL delay (for non-burst mode only) */
573 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY);
574
575 /* TODO: implement ganged mode */
576 } else {
577 u16 bytes;
578
579 if (dsi->master || dsi->slave) {
580 /*
581 * For ganged mode, assume symmetric left-right mode.
582 */
583 bytes = 1 + (mode->hdisplay / 2) * mul / div;
584 } else {
585 /* 1 byte (DCS command) + pixel data */
586 bytes = 1 + mode->hdisplay * mul / div;
587 }
588
589 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1);
590 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3);
591 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5);
592 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7);
593
594 value = MIPI_DCS_WRITE_MEMORY_START << 8 |
595 MIPI_DCS_WRITE_MEMORY_CONTINUE;
596 tegra_dsi_writel(dsi, value, DSI_DCS_CMDS);
597
598 /* set SOL delay */
599 if (dsi->master || dsi->slave) {
600 unsigned long delay, bclk, bclk_ganged;
601 unsigned int lanes = state->lanes;
602
603 /* SOL to valid, valid to FIFO and FIFO write delay */
604 delay = 4 + 4 + 2;
605 delay = DIV_ROUND_UP(delay * mul, div * lanes);
606 /* FIFO read delay */
607 delay = delay + 6;
608
609 bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes);
610 bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes);
611 value = bclk - bclk_ganged + delay + 20;
612 } else {
613 /* TODO: revisit for non-ganged mode */
614 value = 8 * mul / div;
615 }
616
617 tegra_dsi_writel(dsi, value, DSI_SOL_DELAY);
618 }
619
620 if (dsi->slave) {
621 tegra_dsi_configure(dsi->slave, pipe, mode);
622
623 /*
624 * TODO: Support modes other than symmetrical left-right
625 * split.
626 */
627 tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2);
628 tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2,
629 mode->hdisplay / 2);
630 }
631 }
632
633 static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout)
634 {
635 u32 value;
636
637 timeout = jiffies + msecs_to_jiffies(timeout);
638
639 while (time_before(jiffies, timeout)) {
640 value = tegra_dsi_readl(dsi, DSI_STATUS);
641 if (value & DSI_STATUS_IDLE)
642 return 0;
643
644 usleep_range(1000, 2000);
645 }
646
647 return -ETIMEDOUT;
648 }
649
650 static void tegra_dsi_video_disable(struct tegra_dsi *dsi)
651 {
652 u32 value;
653
654 value = tegra_dsi_readl(dsi, DSI_CONTROL);
655 value &= ~DSI_CONTROL_VIDEO_ENABLE;
656 tegra_dsi_writel(dsi, value, DSI_CONTROL);
657
658 if (dsi->slave)
659 tegra_dsi_video_disable(dsi->slave);
660 }
661
662 static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi)
663 {
664 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START);
665 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE);
666 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL);
667 }
668
669 static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
670 {
671 u32 value;
672
673 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
674 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
675
676 return 0;
677 }
678
679 static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
680 {
681 u32 value;
682
683 /*
684 * XXX Is this still needed? The module reset is deasserted right
685 * before this function is called.
686 */
687 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
688 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
689 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
690 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
691 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
692
693 /* start calibration */
694 tegra_dsi_pad_enable(dsi);
695
696 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
697 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
698 DSI_PAD_OUT_CLK(0x0);
699 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);
700
701 value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) |
702 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3);
703 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3);
704
705 return tegra_mipi_calibrate(dsi->mipi);
706 }
707
708 static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk,
709 unsigned int vrefresh)
710 {
711 unsigned int timeout;
712 u32 value;
713
714 /* one frame high-speed transmission timeout */
715 timeout = (bclk / vrefresh) / 512;
716 value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout);
717 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0);
718
719 /* 2 ms peripheral timeout for panel */
720 timeout = 2 * bclk / 512 * 1000;
721 value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000);
722 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1);
723
724 value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0);
725 tegra_dsi_writel(dsi, value, DSI_TO_TALLY);
726
727 if (dsi->slave)
728 tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh);
729 }
730
731 static void tegra_dsi_disable(struct tegra_dsi *dsi)
732 {
733 u32 value;
734
735 if (dsi->slave) {
736 tegra_dsi_ganged_disable(dsi->slave);
737 tegra_dsi_ganged_disable(dsi);
738 }
739
740 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
741 value &= ~DSI_POWER_CONTROL_ENABLE;
742 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
743
744 if (dsi->slave)
745 tegra_dsi_disable(dsi->slave);
746
747 usleep_range(5000, 10000);
748 }
749
750 static void tegra_dsi_soft_reset(struct tegra_dsi *dsi)
751 {
752 u32 value;
753
754 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
755 value &= ~DSI_POWER_CONTROL_ENABLE;
756 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
757
758 usleep_range(300, 1000);
759
760 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
761 value |= DSI_POWER_CONTROL_ENABLE;
762 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
763
764 usleep_range(300, 1000);
765
766 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
767 if (value)
768 tegra_dsi_writel(dsi, 0, DSI_TRIGGER);
769
770 if (dsi->slave)
771 tegra_dsi_soft_reset(dsi->slave);
772 }
773
774 static void tegra_dsi_connector_reset(struct drm_connector *connector)
775 {
776 struct tegra_dsi_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
777
778 if (!state)
779 return;
780
781 if (connector->state) {
782 __drm_atomic_helper_connector_destroy_state(connector->state);
783 kfree(connector->state);
784 }
785
786 __drm_atomic_helper_connector_reset(connector, &state->base);
787 }
788
789 static struct drm_connector_state *
790 tegra_dsi_connector_duplicate_state(struct drm_connector *connector)
791 {
792 struct tegra_dsi_state *state = to_dsi_state(connector->state);
793 struct tegra_dsi_state *copy;
794
795 copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
796 if (!copy)
797 return NULL;
798
799 __drm_atomic_helper_connector_duplicate_state(connector,
800 &copy->base);
801
802 return &copy->base;
803 }
804
805 static const struct drm_connector_funcs tegra_dsi_connector_funcs = {
806 .reset = tegra_dsi_connector_reset,
807 .detect = tegra_output_connector_detect,
808 .fill_modes = drm_helper_probe_single_connector_modes,
809 .destroy = tegra_output_connector_destroy,
810 .atomic_duplicate_state = tegra_dsi_connector_duplicate_state,
811 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
812 .late_register = tegra_dsi_late_register,
813 .early_unregister = tegra_dsi_early_unregister,
814 };
815
816 static enum drm_mode_status
817 tegra_dsi_connector_mode_valid(struct drm_connector *connector,
818 struct drm_display_mode *mode)
819 {
820 return MODE_OK;
821 }
822
823 static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = {
824 .get_modes = tegra_output_connector_get_modes,
825 .mode_valid = tegra_dsi_connector_mode_valid,
826 };
827
828 static const struct drm_encoder_funcs tegra_dsi_encoder_funcs = {
829 .destroy = tegra_output_encoder_destroy,
830 };
831
832 static void tegra_dsi_unprepare(struct tegra_dsi *dsi)
833 {
834 int err;
835
836 if (dsi->slave)
837 tegra_dsi_unprepare(dsi->slave);
838
839 err = tegra_mipi_disable(dsi->mipi);
840 if (err < 0)
841 dev_err(dsi->dev, "failed to disable MIPI calibration: %d\n",
842 err);
843
844 pm_runtime_put(dsi->dev);
845 }
846
847 static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
848 {
849 struct tegra_output *output = encoder_to_output(encoder);
850 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
851 struct tegra_dsi *dsi = to_dsi(output);
852 u32 value;
853 int err;
854
855 if (output->panel)
856 drm_panel_disable(output->panel);
857
858 tegra_dsi_video_disable(dsi);
859
860 /*
861 * The following accesses registers of the display controller, so make
862 * sure it's only executed when the output is attached to one.
863 */
864 if (dc) {
865 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
866 value &= ~DSI_ENABLE;
867 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
868
869 tegra_dc_commit(dc);
870 }
871
872 err = tegra_dsi_wait_idle(dsi, 100);
873 if (err < 0)
874 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err);
875
876 tegra_dsi_soft_reset(dsi);
877
878 if (output->panel)
879 drm_panel_unprepare(output->panel);
880
881 tegra_dsi_disable(dsi);
882
883 tegra_dsi_unprepare(dsi);
884 }
885
886 static void tegra_dsi_prepare(struct tegra_dsi *dsi)
887 {
888 int err;
889
890 pm_runtime_get_sync(dsi->dev);
891
892 err = tegra_mipi_enable(dsi->mipi);
893 if (err < 0)
894 dev_err(dsi->dev, "failed to enable MIPI calibration: %d\n",
895 err);
896
897 err = tegra_dsi_pad_calibrate(dsi);
898 if (err < 0)
899 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
900
901 if (dsi->slave)
902 tegra_dsi_prepare(dsi->slave);
903 }
904
905 static void tegra_dsi_encoder_enable(struct drm_encoder *encoder)
906 {
907 struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
908 struct tegra_output *output = encoder_to_output(encoder);
909 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
910 struct tegra_dsi *dsi = to_dsi(output);
911 struct tegra_dsi_state *state;
912 u32 value;
913
914 tegra_dsi_prepare(dsi);
915
916 state = tegra_dsi_get_state(dsi);
917
918 tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh);
919
920 /*
921 * The D-PHY timing fields are expressed in byte-clock cycles, so
922 * multiply the period by 8.
923 */
924 tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing);
925
926 if (output->panel)
927 drm_panel_prepare(output->panel);
928
929 tegra_dsi_configure(dsi, dc->pipe, mode);
930
931 /* enable display controller */
932 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
933 value |= DSI_ENABLE;
934 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
935
936 tegra_dc_commit(dc);
937
938 /* enable DSI controller */
939 tegra_dsi_enable(dsi);
940
941 if (output->panel)
942 drm_panel_enable(output->panel);
943 }
944
945 static int
946 tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder,
947 struct drm_crtc_state *crtc_state,
948 struct drm_connector_state *conn_state)
949 {
950 struct tegra_output *output = encoder_to_output(encoder);
951 struct tegra_dsi_state *state = to_dsi_state(conn_state);
952 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc);
953 struct tegra_dsi *dsi = to_dsi(output);
954 unsigned int scdiv;
955 unsigned long plld;
956 int err;
957
958 state->pclk = crtc_state->mode.clock * 1000;
959
960 err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div);
961 if (err < 0)
962 return err;
963
964 state->lanes = tegra_dsi_get_lanes(dsi);
965
966 err = tegra_dsi_get_format(dsi->format, &state->format);
967 if (err < 0)
968 return err;
969
970 state->vrefresh = drm_mode_vrefresh(&crtc_state->mode);
971
972 /* compute byte clock */
973 state->bclk = (state->pclk * state->mul) / (state->div * state->lanes);
974
975 DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div,
976 state->lanes);
977 DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format,
978 state->vrefresh);
979 DRM_DEBUG_KMS("bclk: %lu\n", state->bclk);
980
981 /*
982 * Compute bit clock and round up to the next MHz.
983 */
984 plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC;
985 state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld);
986
987 err = mipi_dphy_timing_get_default(&state->timing, state->period);
988 if (err < 0)
989 return err;
990
991 err = mipi_dphy_timing_validate(&state->timing, state->period);
992 if (err < 0) {
993 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
994 return err;
995 }
996
997 /*
998 * We divide the frequency by two here, but we make up for that by
999 * setting the shift clock divider (further below) to half of the
1000 * correct value.
1001 */
1002 plld /= 2;
1003
1004 /*
1005 * Derive pixel clock from bit clock using the shift clock divider.
1006 * Note that this is only half of what we would expect, but we need
1007 * that to make up for the fact that we divided the bit clock by a
1008 * factor of two above.
1009 *
1010 * It's not clear exactly why this is necessary, but the display is
1011 * not working properly otherwise. Perhaps the PLLs cannot generate
1012 * frequencies sufficiently high.
1013 */
1014 scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2;
1015
1016 err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent,
1017 plld, scdiv);
1018 if (err < 0) {
1019 dev_err(output->dev, "failed to setup CRTC state: %d\n", err);
1020 return err;
1021 }
1022
1023 return err;
1024 }
1025
1026 static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = {
1027 .disable = tegra_dsi_encoder_disable,
1028 .enable = tegra_dsi_encoder_enable,
1029 .atomic_check = tegra_dsi_encoder_atomic_check,
1030 };
1031
1032 static int tegra_dsi_init(struct host1x_client *client)
1033 {
1034 struct drm_device *drm = dev_get_drvdata(client->parent);
1035 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1036 int err;
1037
1038 /* Gangsters must not register their own outputs. */
1039 if (!dsi->master) {
1040 dsi->output.dev = client->dev;
1041
1042 drm_connector_init(drm, &dsi->output.connector,
1043 &tegra_dsi_connector_funcs,
1044 DRM_MODE_CONNECTOR_DSI);
1045 drm_connector_helper_add(&dsi->output.connector,
1046 &tegra_dsi_connector_helper_funcs);
1047 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF;
1048
1049 drm_encoder_init(drm, &dsi->output.encoder,
1050 &tegra_dsi_encoder_funcs,
1051 DRM_MODE_ENCODER_DSI, NULL);
1052 drm_encoder_helper_add(&dsi->output.encoder,
1053 &tegra_dsi_encoder_helper_funcs);
1054
1055 drm_connector_attach_encoder(&dsi->output.connector,
1056 &dsi->output.encoder);
1057 drm_connector_register(&dsi->output.connector);
1058
1059 err = tegra_output_init(drm, &dsi->output);
1060 if (err < 0)
1061 dev_err(dsi->dev, "failed to initialize output: %d\n",
1062 err);
1063
1064 dsi->output.encoder.possible_crtcs = 0x3;
1065 }
1066
1067 return 0;
1068 }
1069
1070 static int tegra_dsi_exit(struct host1x_client *client)
1071 {
1072 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1073
1074 tegra_output_exit(&dsi->output);
1075
1076 return 0;
1077 }
1078
1079 static const struct host1x_client_ops dsi_client_ops = {
1080 .init = tegra_dsi_init,
1081 .exit = tegra_dsi_exit,
1082 };
1083
1084 static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
1085 {
1086 struct clk *parent;
1087 int err;
1088
1089 parent = clk_get_parent(dsi->clk);
1090 if (!parent)
1091 return -EINVAL;
1092
1093 err = clk_set_parent(parent, dsi->clk_parent);
1094 if (err < 0)
1095 return err;
1096
1097 return 0;
1098 }
1099
1100 static const char * const error_report[16] = {
1101 "SoT Error",
1102 "SoT Sync Error",
1103 "EoT Sync Error",
1104 "Escape Mode Entry Command Error",
1105 "Low-Power Transmit Sync Error",
1106 "Peripheral Timeout Error",
1107 "False Control Error",
1108 "Contention Detected",
1109 "ECC Error, single-bit",
1110 "ECC Error, multi-bit",
1111 "Checksum Error",
1112 "DSI Data Type Not Recognized",
1113 "DSI VC ID Invalid",
1114 "Invalid Transmission Length",
1115 "Reserved",
1116 "DSI Protocol Violation",
1117 };
1118
1119 static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi,
1120 const struct mipi_dsi_msg *msg,
1121 size_t count)
1122 {
1123 u8 *rx = msg->rx_buf;
1124 unsigned int i, j, k;
1125 size_t size = 0;
1126 u16 errors;
1127 u32 value;
1128
1129 /* read and parse packet header */
1130 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1131
1132 switch (value & 0x3f) {
1133 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1134 errors = (value >> 8) & 0xffff;
1135 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n",
1136 errors);
1137 for (i = 0; i < ARRAY_SIZE(error_report); i++)
1138 if (errors & BIT(i))
1139 dev_dbg(dsi->dev, " %2u: %s\n", i,
1140 error_report[i]);
1141 break;
1142
1143 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1144 rx[0] = (value >> 8) & 0xff;
1145 size = 1;
1146 break;
1147
1148 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1149 rx[0] = (value >> 8) & 0xff;
1150 rx[1] = (value >> 16) & 0xff;
1151 size = 2;
1152 break;
1153
1154 case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
1155 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1156 break;
1157
1158 case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
1159 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1160 break;
1161
1162 default:
1163 dev_err(dsi->dev, "unhandled response type: %02x\n",
1164 value & 0x3f);
1165 return -EPROTO;
1166 }
1167
1168 size = min(size, msg->rx_len);
1169
1170 if (msg->rx_buf && size > 0) {
1171 for (i = 0, j = 0; i < count - 1; i++, j += 4) {
1172 u8 *rx = msg->rx_buf + j;
1173
1174 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1175
1176 for (k = 0; k < 4 && (j + k) < msg->rx_len; k++)
1177 rx[j + k] = (value >> (k << 3)) & 0xff;
1178 }
1179 }
1180
1181 return size;
1182 }
1183
1184 static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout)
1185 {
1186 tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER);
1187
1188 timeout = jiffies + msecs_to_jiffies(timeout);
1189
1190 while (time_before(jiffies, timeout)) {
1191 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
1192 if ((value & DSI_TRIGGER_HOST) == 0)
1193 return 0;
1194
1195 usleep_range(1000, 2000);
1196 }
1197
1198 DRM_DEBUG_KMS("timeout waiting for transmission to complete\n");
1199 return -ETIMEDOUT;
1200 }
1201
1202 static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi,
1203 unsigned long timeout)
1204 {
1205 timeout = jiffies + msecs_to_jiffies(250);
1206
1207 while (time_before(jiffies, timeout)) {
1208 u32 value = tegra_dsi_readl(dsi, DSI_STATUS);
1209 u8 count = value & 0x1f;
1210
1211 if (count > 0)
1212 return count;
1213
1214 usleep_range(1000, 2000);
1215 }
1216
1217 DRM_DEBUG_KMS("peripheral returned no data\n");
1218 return -ETIMEDOUT;
1219 }
1220
1221 static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset,
1222 const void *buffer, size_t size)
1223 {
1224 const u8 *buf = buffer;
1225 size_t i, j;
1226 u32 value;
1227
1228 for (j = 0; j < size; j += 4) {
1229 value = 0;
1230
1231 for (i = 0; i < 4 && j + i < size; i++)
1232 value |= buf[j + i] << (i << 3);
1233
1234 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1235 }
1236 }
1237
1238 static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host,
1239 const struct mipi_dsi_msg *msg)
1240 {
1241 struct tegra_dsi *dsi = host_to_tegra(host);
1242 struct mipi_dsi_packet packet;
1243 const u8 *header;
1244 size_t count;
1245 ssize_t err;
1246 u32 value;
1247
1248 err = mipi_dsi_create_packet(&packet, msg);
1249 if (err < 0)
1250 return err;
1251
1252 header = packet.header;
1253
1254 /* maximum FIFO depth is 1920 words */
1255 if (packet.size > dsi->video_fifo_depth * 4)
1256 return -ENOSPC;
1257
1258 /* reset underflow/overflow flags */
1259 value = tegra_dsi_readl(dsi, DSI_STATUS);
1260 if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) {
1261 value = DSI_HOST_CONTROL_FIFO_RESET;
1262 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1263 usleep_range(10, 20);
1264 }
1265
1266 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
1267 value |= DSI_POWER_CONTROL_ENABLE;
1268 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
1269
1270 usleep_range(5000, 10000);
1271
1272 value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST |
1273 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC;
1274
1275 if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0)
1276 value |= DSI_HOST_CONTROL_HS;
1277
1278 /*
1279 * The host FIFO has a maximum of 64 words, so larger transmissions
1280 * need to use the video FIFO.
1281 */
1282 if (packet.size > dsi->host_fifo_depth * 4)
1283 value |= DSI_HOST_CONTROL_FIFO_SEL;
1284
1285 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1286
1287 /*
1288 * For reads and messages with explicitly requested ACK, generate a
1289 * BTA sequence after the transmission of the packet.
1290 */
1291 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1292 (msg->rx_buf && msg->rx_len > 0)) {
1293 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
1294 value |= DSI_HOST_CONTROL_PKT_BTA;
1295 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1296 }
1297
1298 value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE;
1299 tegra_dsi_writel(dsi, value, DSI_CONTROL);
1300
1301 /* write packet header, ECC is generated by hardware */
1302 value = header[2] << 16 | header[1] << 8 | header[0];
1303 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1304
1305 /* write payload (if any) */
1306 if (packet.payload_length > 0)
1307 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload,
1308 packet.payload_length);
1309
1310 err = tegra_dsi_transmit(dsi, 250);
1311 if (err < 0)
1312 return err;
1313
1314 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1315 (msg->rx_buf && msg->rx_len > 0)) {
1316 err = tegra_dsi_wait_for_response(dsi, 250);
1317 if (err < 0)
1318 return err;
1319
1320 count = err;
1321
1322 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1323 switch (value) {
1324 case 0x84:
1325 /*
1326 dev_dbg(dsi->dev, "ACK\n");
1327 */
1328 break;
1329
1330 case 0x87:
1331 /*
1332 dev_dbg(dsi->dev, "ESCAPE\n");
1333 */
1334 break;
1335
1336 default:
1337 dev_err(dsi->dev, "unknown status: %08x\n", value);
1338 break;
1339 }
1340
1341 if (count > 1) {
1342 err = tegra_dsi_read_response(dsi, msg, count);
1343 if (err < 0)
1344 dev_err(dsi->dev,
1345 "failed to parse response: %zd\n",
1346 err);
1347 else {
1348 /*
1349 * For read commands, return the number of
1350 * bytes returned by the peripheral.
1351 */
1352 count = err;
1353 }
1354 }
1355 } else {
1356 /*
1357 * For write commands, we have transmitted the 4-byte header
1358 * plus the variable-length payload.
1359 */
1360 count = 4 + packet.payload_length;
1361 }
1362
1363 return count;
1364 }
1365
1366 static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi)
1367 {
1368 struct clk *parent;
1369 int err;
1370
1371 /* make sure both DSI controllers share the same PLL */
1372 parent = clk_get_parent(dsi->slave->clk);
1373 if (!parent)
1374 return -EINVAL;
1375
1376 err = clk_set_parent(parent, dsi->clk_parent);
1377 if (err < 0)
1378 return err;
1379
1380 return 0;
1381 }
1382
1383 static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
1384 struct mipi_dsi_device *device)
1385 {
1386 struct tegra_dsi *dsi = host_to_tegra(host);
1387
1388 dsi->flags = device->mode_flags;
1389 dsi->format = device->format;
1390 dsi->lanes = device->lanes;
1391
1392 if (dsi->slave) {
1393 int err;
1394
1395 dev_dbg(dsi->dev, "attaching dual-channel device %s\n",
1396 dev_name(&device->dev));
1397
1398 err = tegra_dsi_ganged_setup(dsi);
1399 if (err < 0) {
1400 dev_err(dsi->dev, "failed to set up ganged mode: %d\n",
1401 err);
1402 return err;
1403 }
1404 }
1405
1406 /*
1407 * Slaves don't have a panel associated with them, so they provide
1408 * merely the second channel.
1409 */
1410 if (!dsi->master) {
1411 struct tegra_output *output = &dsi->output;
1412
1413 output->panel = of_drm_find_panel(device->dev.of_node);
1414 if (IS_ERR(output->panel))
1415 output->panel = NULL;
1416
1417 if (output->panel && output->connector.dev) {
1418 drm_panel_attach(output->panel, &output->connector);
1419 drm_helper_hpd_irq_event(output->connector.dev);
1420 }
1421 }
1422
1423 return 0;
1424 }
1425
1426 static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
1427 struct mipi_dsi_device *device)
1428 {
1429 struct tegra_dsi *dsi = host_to_tegra(host);
1430 struct tegra_output *output = &dsi->output;
1431
1432 if (output->panel && &device->dev == output->panel->dev) {
1433 output->panel = NULL;
1434
1435 if (output->connector.dev)
1436 drm_helper_hpd_irq_event(output->connector.dev);
1437 }
1438
1439 return 0;
1440 }
1441
1442 static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
1443 .attach = tegra_dsi_host_attach,
1444 .detach = tegra_dsi_host_detach,
1445 .transfer = tegra_dsi_host_transfer,
1446 };
1447
1448 static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
1449 {
1450 struct device_node *np;
1451
1452 np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0);
1453 if (np) {
1454 struct platform_device *gangster = of_find_device_by_node(np);
1455
1456 dsi->slave = platform_get_drvdata(gangster);
1457 of_node_put(np);
1458
1459 if (!dsi->slave)
1460 return -EPROBE_DEFER;
1461
1462 dsi->slave->master = dsi;
1463 }
1464
1465 return 0;
1466 }
1467
1468 static int tegra_dsi_probe(struct platform_device *pdev)
1469 {
1470 struct tegra_dsi *dsi;
1471 struct resource *regs;
1472 int err;
1473
1474 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
1475 if (!dsi)
1476 return -ENOMEM;
1477
1478 dsi->output.dev = dsi->dev = &pdev->dev;
1479 dsi->video_fifo_depth = 1920;
1480 dsi->host_fifo_depth = 64;
1481
1482 err = tegra_dsi_ganged_probe(dsi);
1483 if (err < 0)
1484 return err;
1485
1486 err = tegra_output_probe(&dsi->output);
1487 if (err < 0)
1488 return err;
1489
1490 dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD;
1491
1492 /*
1493 * Assume these values by default. When a DSI peripheral driver
1494 * attaches to the DSI host, the parameters will be taken from
1495 * the attached device.
1496 */
1497 dsi->flags = MIPI_DSI_MODE_VIDEO;
1498 dsi->format = MIPI_DSI_FMT_RGB888;
1499 dsi->lanes = 4;
1500
1501 if (!pdev->dev.pm_domain) {
1502 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
1503 if (IS_ERR(dsi->rst))
1504 return PTR_ERR(dsi->rst);
1505 }
1506
1507 dsi->clk = devm_clk_get(&pdev->dev, NULL);
1508 if (IS_ERR(dsi->clk)) {
1509 dev_err(&pdev->dev, "cannot get DSI clock\n");
1510 return PTR_ERR(dsi->clk);
1511 }
1512
1513 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
1514 if (IS_ERR(dsi->clk_lp)) {
1515 dev_err(&pdev->dev, "cannot get low-power clock\n");
1516 return PTR_ERR(dsi->clk_lp);
1517 }
1518
1519 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
1520 if (IS_ERR(dsi->clk_parent)) {
1521 dev_err(&pdev->dev, "cannot get parent clock\n");
1522 return PTR_ERR(dsi->clk_parent);
1523 }
1524
1525 dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");
1526 if (IS_ERR(dsi->vdd)) {
1527 dev_err(&pdev->dev, "cannot get VDD supply\n");
1528 return PTR_ERR(dsi->vdd);
1529 }
1530
1531 err = tegra_dsi_setup_clocks(dsi);
1532 if (err < 0) {
1533 dev_err(&pdev->dev, "cannot setup clocks\n");
1534 return err;
1535 }
1536
1537 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1538 dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
1539 if (IS_ERR(dsi->regs))
1540 return PTR_ERR(dsi->regs);
1541
1542 dsi->mipi = tegra_mipi_request(&pdev->dev);
1543 if (IS_ERR(dsi->mipi))
1544 return PTR_ERR(dsi->mipi);
1545
1546 dsi->host.ops = &tegra_dsi_host_ops;
1547 dsi->host.dev = &pdev->dev;
1548
1549 err = mipi_dsi_host_register(&dsi->host);
1550 if (err < 0) {
1551 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
1552 goto mipi_free;
1553 }
1554
1555 platform_set_drvdata(pdev, dsi);
1556 pm_runtime_enable(&pdev->dev);
1557
1558 INIT_LIST_HEAD(&dsi->client.list);
1559 dsi->client.ops = &dsi_client_ops;
1560 dsi->client.dev = &pdev->dev;
1561
1562 err = host1x_client_register(&dsi->client);
1563 if (err < 0) {
1564 dev_err(&pdev->dev, "failed to register host1x client: %d\n",
1565 err);
1566 goto unregister;
1567 }
1568
1569 return 0;
1570
1571 unregister:
1572 mipi_dsi_host_unregister(&dsi->host);
1573 mipi_free:
1574 tegra_mipi_free(dsi->mipi);
1575 return err;
1576 }
1577
1578 static int tegra_dsi_remove(struct platform_device *pdev)
1579 {
1580 struct tegra_dsi *dsi = platform_get_drvdata(pdev);
1581 int err;
1582
1583 pm_runtime_disable(&pdev->dev);
1584
1585 err = host1x_client_unregister(&dsi->client);
1586 if (err < 0) {
1587 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
1588 err);
1589 return err;
1590 }
1591
1592 tegra_output_remove(&dsi->output);
1593
1594 mipi_dsi_host_unregister(&dsi->host);
1595 tegra_mipi_free(dsi->mipi);
1596
1597 return 0;
1598 }
1599
1600 #ifdef CONFIG_PM
1601 static int tegra_dsi_suspend(struct device *dev)
1602 {
1603 struct tegra_dsi *dsi = dev_get_drvdata(dev);
1604 int err;
1605
1606 if (dsi->rst) {
1607 err = reset_control_assert(dsi->rst);
1608 if (err < 0) {
1609 dev_err(dev, "failed to assert reset: %d\n", err);
1610 return err;
1611 }
1612 }
1613
1614 usleep_range(1000, 2000);
1615
1616 clk_disable_unprepare(dsi->clk_lp);
1617 clk_disable_unprepare(dsi->clk);
1618
1619 regulator_disable(dsi->vdd);
1620
1621 return 0;
1622 }
1623
1624 static int tegra_dsi_resume(struct device *dev)
1625 {
1626 struct tegra_dsi *dsi = dev_get_drvdata(dev);
1627 int err;
1628
1629 err = regulator_enable(dsi->vdd);
1630 if (err < 0) {
1631 dev_err(dsi->dev, "failed to enable VDD supply: %d\n", err);
1632 return err;
1633 }
1634
1635 err = clk_prepare_enable(dsi->clk);
1636 if (err < 0) {
1637 dev_err(dev, "cannot enable DSI clock: %d\n", err);
1638 goto disable_vdd;
1639 }
1640
1641 err = clk_prepare_enable(dsi->clk_lp);
1642 if (err < 0) {
1643 dev_err(dev, "cannot enable low-power clock: %d\n", err);
1644 goto disable_clk;
1645 }
1646
1647 usleep_range(1000, 2000);
1648
1649 if (dsi->rst) {
1650 err = reset_control_deassert(dsi->rst);
1651 if (err < 0) {
1652 dev_err(dev, "cannot assert reset: %d\n", err);
1653 goto disable_clk_lp;
1654 }
1655 }
1656
1657 return 0;
1658
1659 disable_clk_lp:
1660 clk_disable_unprepare(dsi->clk_lp);
1661 disable_clk:
1662 clk_disable_unprepare(dsi->clk);
1663 disable_vdd:
1664 regulator_disable(dsi->vdd);
1665 return err;
1666 }
1667 #endif
1668
1669 static const struct dev_pm_ops tegra_dsi_pm_ops = {
1670 SET_RUNTIME_PM_OPS(tegra_dsi_suspend, tegra_dsi_resume, NULL)
1671 };
1672
1673 static const struct of_device_id tegra_dsi_of_match[] = {
1674 { .compatible = "nvidia,tegra210-dsi", },
1675 { .compatible = "nvidia,tegra132-dsi", },
1676 { .compatible = "nvidia,tegra124-dsi", },
1677 { .compatible = "nvidia,tegra114-dsi", },
1678 { },
1679 };
1680 MODULE_DEVICE_TABLE(of, tegra_dsi_of_match);
1681
1682 struct platform_driver tegra_dsi_driver = {
1683 .driver = {
1684 .name = "tegra-dsi",
1685 .of_match_table = tegra_dsi_of_match,
1686 .pm = &tegra_dsi_pm_ops,
1687 },
1688 .probe = tegra_dsi_probe,
1689 .remove = tegra_dsi_remove,
1690 };
Linux with added FPC-III support