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
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 *
to_dsi_state(struct drm_connector_state * 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 *
host1x_client_to_dsi(struct host1x_client * client)87 host1x_client_to_dsi(struct host1x_client *client)
88 {
89 return container_of(client, struct tegra_dsi, client);
90 }
91
host_to_tegra(struct mipi_dsi_host * host)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
to_dsi(struct tegra_output * output)97 static inline struct tegra_dsi *to_dsi(struct tegra_output *output)
98 {
99 return container_of(output, struct tegra_dsi, output);
100 }
101
tegra_dsi_get_state(struct tegra_dsi * dsi)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
tegra_dsi_readl(struct tegra_dsi * dsi,unsigned int offset)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
tegra_dsi_writel(struct tegra_dsi * dsi,u32 value,unsigned int offset)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
tegra_dsi_show_regs(struct seq_file * s,void * data)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
tegra_dsi_late_register(struct drm_connector * connector)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
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
tegra_dsi_early_unregister(struct drm_connector * connector)252 static 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->dev->primary);
260 kfree(dsi->debugfs_files);
261 dsi->debugfs_files = NULL;
262 }
263
264 #define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9))
265 #define PKT_LEN0(len) (((len) & 0x07) << 0)
266 #define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19))
267 #define PKT_LEN1(len) (((len) & 0x07) << 10)
268 #define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29))
269 #define PKT_LEN2(len) (((len) & 0x07) << 20)
270
271 #define PKT_LP (1 << 30)
272 #define NUM_PKT_SEQ 12
273
274 /*
275 * non-burst mode with sync pulses
276 */
277 static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = {
278 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
279 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
280 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
281 PKT_LP,
282 [ 1] = 0,
283 [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) |
284 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
285 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
286 PKT_LP,
287 [ 3] = 0,
288 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
289 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
290 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
291 PKT_LP,
292 [ 5] = 0,
293 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
294 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
295 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
296 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
297 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
298 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
299 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
300 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
301 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
302 PKT_LP,
303 [ 9] = 0,
304 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
305 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
306 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
307 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
308 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
309 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
310 };
311
312 /*
313 * non-burst mode with sync events
314 */
315 static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = {
316 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
317 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
318 PKT_LP,
319 [ 1] = 0,
320 [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
321 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
322 PKT_LP,
323 [ 3] = 0,
324 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
325 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
326 PKT_LP,
327 [ 5] = 0,
328 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
329 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
330 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
331 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
332 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
333 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
334 PKT_LP,
335 [ 9] = 0,
336 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
337 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
338 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
339 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
340 };
341
342 static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = {
343 [ 0] = 0,
344 [ 1] = 0,
345 [ 2] = 0,
346 [ 3] = 0,
347 [ 4] = 0,
348 [ 5] = 0,
349 [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP,
350 [ 7] = 0,
351 [ 8] = 0,
352 [ 9] = 0,
353 [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP,
354 [11] = 0,
355 };
356
tegra_dsi_set_phy_timing(struct tegra_dsi * dsi,unsigned long period,const struct mipi_dphy_timing * timing)357 static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi,
358 unsigned long period,
359 const struct mipi_dphy_timing *timing)
360 {
361 u32 value;
362
363 value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 |
364 DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 |
365 DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 |
366 DSI_TIMING_FIELD(timing->hsprepare, period, 1);
367 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0);
368
369 value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 |
370 DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 |
371 DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 |
372 DSI_TIMING_FIELD(timing->lpx, period, 1);
373 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1);
374
375 value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 |
376 DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 |
377 DSI_TIMING_FIELD(0xff * period, period, 0) << 0;
378 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2);
379
380 value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 |
381 DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 |
382 DSI_TIMING_FIELD(timing->tago, period, 1);
383 tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);
384
385 if (dsi->slave)
386 tegra_dsi_set_phy_timing(dsi->slave, period, timing);
387 }
388
tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,unsigned int * mulp,unsigned int * divp)389 static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,
390 unsigned int *mulp, unsigned int *divp)
391 {
392 switch (format) {
393 case MIPI_DSI_FMT_RGB666_PACKED:
394 case MIPI_DSI_FMT_RGB888:
395 *mulp = 3;
396 *divp = 1;
397 break;
398
399 case MIPI_DSI_FMT_RGB565:
400 *mulp = 2;
401 *divp = 1;
402 break;
403
404 case MIPI_DSI_FMT_RGB666:
405 *mulp = 9;
406 *divp = 4;
407 break;
408
409 default:
410 return -EINVAL;
411 }
412
413 return 0;
414 }
415
tegra_dsi_get_format(enum mipi_dsi_pixel_format format,enum tegra_dsi_format * fmt)416 static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format,
417 enum tegra_dsi_format *fmt)
418 {
419 switch (format) {
420 case MIPI_DSI_FMT_RGB888:
421 *fmt = TEGRA_DSI_FORMAT_24P;
422 break;
423
424 case MIPI_DSI_FMT_RGB666:
425 *fmt = TEGRA_DSI_FORMAT_18NP;
426 break;
427
428 case MIPI_DSI_FMT_RGB666_PACKED:
429 *fmt = TEGRA_DSI_FORMAT_18P;
430 break;
431
432 case MIPI_DSI_FMT_RGB565:
433 *fmt = TEGRA_DSI_FORMAT_16P;
434 break;
435
436 default:
437 return -EINVAL;
438 }
439
440 return 0;
441 }
442
tegra_dsi_ganged_enable(struct tegra_dsi * dsi,unsigned int start,unsigned int size)443 static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start,
444 unsigned int size)
445 {
446 u32 value;
447
448 tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START);
449 tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE);
450
451 value = DSI_GANGED_MODE_CONTROL_ENABLE;
452 tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL);
453 }
454
tegra_dsi_enable(struct tegra_dsi * dsi)455 static void tegra_dsi_enable(struct tegra_dsi *dsi)
456 {
457 u32 value;
458
459 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
460 value |= DSI_POWER_CONTROL_ENABLE;
461 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
462
463 if (dsi->slave)
464 tegra_dsi_enable(dsi->slave);
465 }
466
tegra_dsi_get_lanes(struct tegra_dsi * dsi)467 static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi)
468 {
469 if (dsi->master)
470 return dsi->master->lanes + dsi->lanes;
471
472 if (dsi->slave)
473 return dsi->lanes + dsi->slave->lanes;
474
475 return dsi->lanes;
476 }
477
tegra_dsi_configure(struct tegra_dsi * dsi,unsigned int pipe,const struct drm_display_mode * mode)478 static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
479 const struct drm_display_mode *mode)
480 {
481 unsigned int hact, hsw, hbp, hfp, i, mul, div;
482 struct tegra_dsi_state *state;
483 const u32 *pkt_seq;
484 u32 value;
485
486 /* XXX: pass in state into this function? */
487 if (dsi->master)
488 state = tegra_dsi_get_state(dsi->master);
489 else
490 state = tegra_dsi_get_state(dsi);
491
492 mul = state->mul;
493 div = state->div;
494
495 if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
496 DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n");
497 pkt_seq = pkt_seq_video_non_burst_sync_pulses;
498 } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
499 DRM_DEBUG_KMS("Non-burst video mode with sync events\n");
500 pkt_seq = pkt_seq_video_non_burst_sync_events;
501 } else {
502 DRM_DEBUG_KMS("Command mode\n");
503 pkt_seq = pkt_seq_command_mode;
504 }
505
506 value = DSI_CONTROL_CHANNEL(0) |
507 DSI_CONTROL_FORMAT(state->format) |
508 DSI_CONTROL_LANES(dsi->lanes - 1) |
509 DSI_CONTROL_SOURCE(pipe);
510 tegra_dsi_writel(dsi, value, DSI_CONTROL);
511
512 tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD);
513
514 value = DSI_HOST_CONTROL_HS;
515 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
516
517 value = tegra_dsi_readl(dsi, DSI_CONTROL);
518
519 if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
520 value |= DSI_CONTROL_HS_CLK_CTRL;
521
522 value &= ~DSI_CONTROL_TX_TRIG(3);
523
524 /* enable DCS commands for command mode */
525 if (dsi->flags & MIPI_DSI_MODE_VIDEO)
526 value &= ~DSI_CONTROL_DCS_ENABLE;
527 else
528 value |= DSI_CONTROL_DCS_ENABLE;
529
530 value |= DSI_CONTROL_VIDEO_ENABLE;
531 value &= ~DSI_CONTROL_HOST_ENABLE;
532 tegra_dsi_writel(dsi, value, DSI_CONTROL);
533
534 for (i = 0; i < NUM_PKT_SEQ; i++)
535 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);
536
537 if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
538 /* horizontal active pixels */
539 hact = mode->hdisplay * mul / div;
540
541 /* horizontal sync width */
542 hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
543
544 /* horizontal back porch */
545 hbp = (mode->htotal - mode->hsync_end) * mul / div;
546
547 if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
548 hbp += hsw;
549
550 /* horizontal front porch */
551 hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
552
553 /* subtract packet overhead */
554 hsw -= 10;
555 hbp -= 14;
556 hfp -= 8;
557
558 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);
559 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3);
560 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5);
561 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7);
562
563 /* set SOL delay (for non-burst mode only) */
564 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY);
565
566 /* TODO: implement ganged mode */
567 } else {
568 u16 bytes;
569
570 if (dsi->master || dsi->slave) {
571 /*
572 * For ganged mode, assume symmetric left-right mode.
573 */
574 bytes = 1 + (mode->hdisplay / 2) * mul / div;
575 } else {
576 /* 1 byte (DCS command) + pixel data */
577 bytes = 1 + mode->hdisplay * mul / div;
578 }
579
580 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1);
581 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3);
582 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5);
583 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7);
584
585 value = MIPI_DCS_WRITE_MEMORY_START << 8 |
586 MIPI_DCS_WRITE_MEMORY_CONTINUE;
587 tegra_dsi_writel(dsi, value, DSI_DCS_CMDS);
588
589 /* set SOL delay */
590 if (dsi->master || dsi->slave) {
591 unsigned long delay, bclk, bclk_ganged;
592 unsigned int lanes = state->lanes;
593
594 /* SOL to valid, valid to FIFO and FIFO write delay */
595 delay = 4 + 4 + 2;
596 delay = DIV_ROUND_UP(delay * mul, div * lanes);
597 /* FIFO read delay */
598 delay = delay + 6;
599
600 bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes);
601 bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes);
602 value = bclk - bclk_ganged + delay + 20;
603 } else {
604 /* TODO: revisit for non-ganged mode */
605 value = 8 * mul / div;
606 }
607
608 tegra_dsi_writel(dsi, value, DSI_SOL_DELAY);
609 }
610
611 if (dsi->slave) {
612 tegra_dsi_configure(dsi->slave, pipe, mode);
613
614 /*
615 * TODO: Support modes other than symmetrical left-right
616 * split.
617 */
618 tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2);
619 tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2,
620 mode->hdisplay / 2);
621 }
622 }
623
tegra_dsi_wait_idle(struct tegra_dsi * dsi,unsigned long timeout)624 static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout)
625 {
626 u32 value;
627
628 timeout = jiffies + msecs_to_jiffies(timeout);
629
630 while (time_before(jiffies, timeout)) {
631 value = tegra_dsi_readl(dsi, DSI_STATUS);
632 if (value & DSI_STATUS_IDLE)
633 return 0;
634
635 usleep_range(1000, 2000);
636 }
637
638 return -ETIMEDOUT;
639 }
640
tegra_dsi_video_disable(struct tegra_dsi * dsi)641 static void tegra_dsi_video_disable(struct tegra_dsi *dsi)
642 {
643 u32 value;
644
645 value = tegra_dsi_readl(dsi, DSI_CONTROL);
646 value &= ~DSI_CONTROL_VIDEO_ENABLE;
647 tegra_dsi_writel(dsi, value, DSI_CONTROL);
648
649 if (dsi->slave)
650 tegra_dsi_video_disable(dsi->slave);
651 }
652
tegra_dsi_ganged_disable(struct tegra_dsi * dsi)653 static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi)
654 {
655 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START);
656 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE);
657 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL);
658 }
659
tegra_dsi_pad_enable(struct tegra_dsi * dsi)660 static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
661 {
662 u32 value;
663
664 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
665 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
666
667 return 0;
668 }
669
tegra_dsi_pad_calibrate(struct tegra_dsi * dsi)670 static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
671 {
672 u32 value;
673 int err;
674
675 /*
676 * XXX Is this still needed? The module reset is deasserted right
677 * before this function is called.
678 */
679 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
680 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
681 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
682 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
683 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
684
685 /* start calibration */
686 tegra_dsi_pad_enable(dsi);
687
688 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
689 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
690 DSI_PAD_OUT_CLK(0x0);
691 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);
692
693 value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) |
694 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3);
695 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3);
696
697 err = tegra_mipi_start_calibration(dsi->mipi);
698 if (err < 0)
699 return err;
700
701 return tegra_mipi_finish_calibration(dsi->mipi);
702 }
703
tegra_dsi_set_timeout(struct tegra_dsi * dsi,unsigned long bclk,unsigned int vrefresh)704 static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk,
705 unsigned int vrefresh)
706 {
707 unsigned int timeout;
708 u32 value;
709
710 /* one frame high-speed transmission timeout */
711 timeout = (bclk / vrefresh) / 512;
712 value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout);
713 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0);
714
715 /* 2 ms peripheral timeout for panel */
716 timeout = 2 * bclk / 512 * 1000;
717 value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000);
718 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1);
719
720 value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0);
721 tegra_dsi_writel(dsi, value, DSI_TO_TALLY);
722
723 if (dsi->slave)
724 tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh);
725 }
726
tegra_dsi_disable(struct tegra_dsi * dsi)727 static void tegra_dsi_disable(struct tegra_dsi *dsi)
728 {
729 u32 value;
730
731 if (dsi->slave) {
732 tegra_dsi_ganged_disable(dsi->slave);
733 tegra_dsi_ganged_disable(dsi);
734 }
735
736 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
737 value &= ~DSI_POWER_CONTROL_ENABLE;
738 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
739
740 if (dsi->slave)
741 tegra_dsi_disable(dsi->slave);
742
743 usleep_range(5000, 10000);
744 }
745
tegra_dsi_soft_reset(struct tegra_dsi * dsi)746 static void tegra_dsi_soft_reset(struct tegra_dsi *dsi)
747 {
748 u32 value;
749
750 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
751 value &= ~DSI_POWER_CONTROL_ENABLE;
752 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
753
754 usleep_range(300, 1000);
755
756 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
757 value |= DSI_POWER_CONTROL_ENABLE;
758 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
759
760 usleep_range(300, 1000);
761
762 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
763 if (value)
764 tegra_dsi_writel(dsi, 0, DSI_TRIGGER);
765
766 if (dsi->slave)
767 tegra_dsi_soft_reset(dsi->slave);
768 }
769
tegra_dsi_connector_reset(struct drm_connector * connector)770 static void tegra_dsi_connector_reset(struct drm_connector *connector)
771 {
772 struct tegra_dsi_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
773
774 if (!state)
775 return;
776
777 if (connector->state) {
778 __drm_atomic_helper_connector_destroy_state(connector->state);
779 kfree(connector->state);
780 }
781
782 __drm_atomic_helper_connector_reset(connector, &state->base);
783 }
784
785 static struct drm_connector_state *
tegra_dsi_connector_duplicate_state(struct drm_connector * connector)786 tegra_dsi_connector_duplicate_state(struct drm_connector *connector)
787 {
788 struct tegra_dsi_state *state = to_dsi_state(connector->state);
789 struct tegra_dsi_state *copy;
790
791 copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
792 if (!copy)
793 return NULL;
794
795 __drm_atomic_helper_connector_duplicate_state(connector,
796 ©->base);
797
798 return ©->base;
799 }
800
801 static const struct drm_connector_funcs tegra_dsi_connector_funcs = {
802 .reset = tegra_dsi_connector_reset,
803 .detect = tegra_output_connector_detect,
804 .fill_modes = drm_helper_probe_single_connector_modes,
805 .destroy = tegra_output_connector_destroy,
806 .atomic_duplicate_state = tegra_dsi_connector_duplicate_state,
807 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
808 .late_register = tegra_dsi_late_register,
809 .early_unregister = tegra_dsi_early_unregister,
810 };
811
812 static enum drm_mode_status
tegra_dsi_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)813 tegra_dsi_connector_mode_valid(struct drm_connector *connector,
814 struct drm_display_mode *mode)
815 {
816 return MODE_OK;
817 }
818
819 static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = {
820 .get_modes = tegra_output_connector_get_modes,
821 .mode_valid = tegra_dsi_connector_mode_valid,
822 };
823
tegra_dsi_unprepare(struct tegra_dsi * dsi)824 static void tegra_dsi_unprepare(struct tegra_dsi *dsi)
825 {
826 int err;
827
828 if (dsi->slave)
829 tegra_dsi_unprepare(dsi->slave);
830
831 err = tegra_mipi_disable(dsi->mipi);
832 if (err < 0)
833 dev_err(dsi->dev, "failed to disable MIPI calibration: %d\n",
834 err);
835
836 err = host1x_client_suspend(&dsi->client);
837 if (err < 0)
838 dev_err(dsi->dev, "failed to suspend: %d\n", err);
839 }
840
tegra_dsi_encoder_disable(struct drm_encoder * encoder)841 static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
842 {
843 struct tegra_output *output = encoder_to_output(encoder);
844 struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
845 struct tegra_dsi *dsi = to_dsi(output);
846 u32 value;
847 int err;
848
849 if (output->panel)
850 drm_panel_disable(output->panel);
851
852 tegra_dsi_video_disable(dsi);
853
854 /*
855 * The following accesses registers of the display controller, so make
856 * sure it's only executed when the output is attached to one.
857 */
858 if (dc) {
859 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
860 value &= ~DSI_ENABLE;
861 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
862
863 tegra_dc_commit(dc);
864 }
865
866 err = tegra_dsi_wait_idle(dsi, 100);
867 if (err < 0)
868 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err);
869
870 tegra_dsi_soft_reset(dsi);
871
872 if (output->panel)
873 drm_panel_unprepare(output->panel);
874
875 tegra_dsi_disable(dsi);
876
877 tegra_dsi_unprepare(dsi);
878 }
879
tegra_dsi_prepare(struct tegra_dsi * dsi)880 static int tegra_dsi_prepare(struct tegra_dsi *dsi)
881 {
882 int err;
883
884 err = host1x_client_resume(&dsi->client);
885 if (err < 0) {
886 dev_err(dsi->dev, "failed to resume: %d\n", err);
887 return err;
888 }
889
890 err = tegra_mipi_enable(dsi->mipi);
891 if (err < 0)
892 dev_err(dsi->dev, "failed to enable MIPI calibration: %d\n",
893 err);
894
895 err = tegra_dsi_pad_calibrate(dsi);
896 if (err < 0)
897 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
898
899 if (dsi->slave)
900 tegra_dsi_prepare(dsi->slave);
901
902 return 0;
903 }
904
tegra_dsi_encoder_enable(struct drm_encoder * encoder)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 int err;
914
915 err = tegra_dsi_prepare(dsi);
916 if (err < 0) {
917 dev_err(dsi->dev, "failed to prepare: %d\n", err);
918 return;
919 }
920
921 state = tegra_dsi_get_state(dsi);
922
923 tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh);
924
925 /*
926 * The D-PHY timing fields are expressed in byte-clock cycles, so
927 * multiply the period by 8.
928 */
929 tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing);
930
931 if (output->panel)
932 drm_panel_prepare(output->panel);
933
934 tegra_dsi_configure(dsi, dc->pipe, mode);
935
936 /* enable display controller */
937 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
938 value |= DSI_ENABLE;
939 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
940
941 tegra_dc_commit(dc);
942
943 /* enable DSI controller */
944 tegra_dsi_enable(dsi);
945
946 if (output->panel)
947 drm_panel_enable(output->panel);
948 }
949
950 static int
tegra_dsi_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)951 tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder,
952 struct drm_crtc_state *crtc_state,
953 struct drm_connector_state *conn_state)
954 {
955 struct tegra_output *output = encoder_to_output(encoder);
956 struct tegra_dsi_state *state = to_dsi_state(conn_state);
957 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc);
958 struct tegra_dsi *dsi = to_dsi(output);
959 unsigned int scdiv;
960 unsigned long plld;
961 int err;
962
963 state->pclk = crtc_state->mode.clock * 1000;
964
965 err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div);
966 if (err < 0)
967 return err;
968
969 state->lanes = tegra_dsi_get_lanes(dsi);
970
971 err = tegra_dsi_get_format(dsi->format, &state->format);
972 if (err < 0)
973 return err;
974
975 state->vrefresh = drm_mode_vrefresh(&crtc_state->mode);
976
977 /* compute byte clock */
978 state->bclk = (state->pclk * state->mul) / (state->div * state->lanes);
979
980 DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div,
981 state->lanes);
982 DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format,
983 state->vrefresh);
984 DRM_DEBUG_KMS("bclk: %lu\n", state->bclk);
985
986 /*
987 * Compute bit clock and round up to the next MHz.
988 */
989 plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC;
990 state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld);
991
992 err = mipi_dphy_timing_get_default(&state->timing, state->period);
993 if (err < 0)
994 return err;
995
996 err = mipi_dphy_timing_validate(&state->timing, state->period);
997 if (err < 0) {
998 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
999 return err;
1000 }
1001
1002 /*
1003 * We divide the frequency by two here, but we make up for that by
1004 * setting the shift clock divider (further below) to half of the
1005 * correct value.
1006 */
1007 plld /= 2;
1008
1009 /*
1010 * Derive pixel clock from bit clock using the shift clock divider.
1011 * Note that this is only half of what we would expect, but we need
1012 * that to make up for the fact that we divided the bit clock by a
1013 * factor of two above.
1014 *
1015 * It's not clear exactly why this is necessary, but the display is
1016 * not working properly otherwise. Perhaps the PLLs cannot generate
1017 * frequencies sufficiently high.
1018 */
1019 scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2;
1020
1021 err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent,
1022 plld, scdiv);
1023 if (err < 0) {
1024 dev_err(output->dev, "failed to setup CRTC state: %d\n", err);
1025 return err;
1026 }
1027
1028 return err;
1029 }
1030
1031 static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = {
1032 .disable = tegra_dsi_encoder_disable,
1033 .enable = tegra_dsi_encoder_enable,
1034 .atomic_check = tegra_dsi_encoder_atomic_check,
1035 };
1036
tegra_dsi_init(struct host1x_client * client)1037 static int tegra_dsi_init(struct host1x_client *client)
1038 {
1039 struct drm_device *drm = dev_get_drvdata(client->host);
1040 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1041 int err;
1042
1043 /* Gangsters must not register their own outputs. */
1044 if (!dsi->master) {
1045 dsi->output.dev = client->dev;
1046
1047 drm_connector_init(drm, &dsi->output.connector,
1048 &tegra_dsi_connector_funcs,
1049 DRM_MODE_CONNECTOR_DSI);
1050 drm_connector_helper_add(&dsi->output.connector,
1051 &tegra_dsi_connector_helper_funcs);
1052 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF;
1053
1054 drm_simple_encoder_init(drm, &dsi->output.encoder,
1055 DRM_MODE_ENCODER_DSI);
1056 drm_encoder_helper_add(&dsi->output.encoder,
1057 &tegra_dsi_encoder_helper_funcs);
1058
1059 drm_connector_attach_encoder(&dsi->output.connector,
1060 &dsi->output.encoder);
1061 drm_connector_register(&dsi->output.connector);
1062
1063 err = tegra_output_init(drm, &dsi->output);
1064 if (err < 0)
1065 dev_err(dsi->dev, "failed to initialize output: %d\n",
1066 err);
1067
1068 dsi->output.encoder.possible_crtcs = 0x3;
1069 }
1070
1071 return 0;
1072 }
1073
tegra_dsi_exit(struct host1x_client * client)1074 static int tegra_dsi_exit(struct host1x_client *client)
1075 {
1076 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1077
1078 tegra_output_exit(&dsi->output);
1079
1080 return 0;
1081 }
1082
tegra_dsi_runtime_suspend(struct host1x_client * client)1083 static int tegra_dsi_runtime_suspend(struct host1x_client *client)
1084 {
1085 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1086 struct device *dev = client->dev;
1087 int err;
1088
1089 if (dsi->rst) {
1090 err = reset_control_assert(dsi->rst);
1091 if (err < 0) {
1092 dev_err(dev, "failed to assert reset: %d\n", err);
1093 return err;
1094 }
1095 }
1096
1097 usleep_range(1000, 2000);
1098
1099 clk_disable_unprepare(dsi->clk_lp);
1100 clk_disable_unprepare(dsi->clk);
1101
1102 regulator_disable(dsi->vdd);
1103 pm_runtime_put_sync(dev);
1104
1105 return 0;
1106 }
1107
tegra_dsi_runtime_resume(struct host1x_client * client)1108 static int tegra_dsi_runtime_resume(struct host1x_client *client)
1109 {
1110 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1111 struct device *dev = client->dev;
1112 int err;
1113
1114 err = pm_runtime_resume_and_get(dev);
1115 if (err < 0) {
1116 dev_err(dev, "failed to get runtime PM: %d\n", err);
1117 return err;
1118 }
1119
1120 err = regulator_enable(dsi->vdd);
1121 if (err < 0) {
1122 dev_err(dev, "failed to enable VDD supply: %d\n", err);
1123 goto put_rpm;
1124 }
1125
1126 err = clk_prepare_enable(dsi->clk);
1127 if (err < 0) {
1128 dev_err(dev, "cannot enable DSI clock: %d\n", err);
1129 goto disable_vdd;
1130 }
1131
1132 err = clk_prepare_enable(dsi->clk_lp);
1133 if (err < 0) {
1134 dev_err(dev, "cannot enable low-power clock: %d\n", err);
1135 goto disable_clk;
1136 }
1137
1138 usleep_range(1000, 2000);
1139
1140 if (dsi->rst) {
1141 err = reset_control_deassert(dsi->rst);
1142 if (err < 0) {
1143 dev_err(dev, "cannot assert reset: %d\n", err);
1144 goto disable_clk_lp;
1145 }
1146 }
1147
1148 return 0;
1149
1150 disable_clk_lp:
1151 clk_disable_unprepare(dsi->clk_lp);
1152 disable_clk:
1153 clk_disable_unprepare(dsi->clk);
1154 disable_vdd:
1155 regulator_disable(dsi->vdd);
1156 put_rpm:
1157 pm_runtime_put_sync(dev);
1158 return err;
1159 }
1160
1161 static const struct host1x_client_ops dsi_client_ops = {
1162 .init = tegra_dsi_init,
1163 .exit = tegra_dsi_exit,
1164 .suspend = tegra_dsi_runtime_suspend,
1165 .resume = tegra_dsi_runtime_resume,
1166 };
1167
tegra_dsi_setup_clocks(struct tegra_dsi * dsi)1168 static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
1169 {
1170 struct clk *parent;
1171 int err;
1172
1173 parent = clk_get_parent(dsi->clk);
1174 if (!parent)
1175 return -EINVAL;
1176
1177 err = clk_set_parent(parent, dsi->clk_parent);
1178 if (err < 0)
1179 return err;
1180
1181 return 0;
1182 }
1183
1184 static const char * const error_report[16] = {
1185 "SoT Error",
1186 "SoT Sync Error",
1187 "EoT Sync Error",
1188 "Escape Mode Entry Command Error",
1189 "Low-Power Transmit Sync Error",
1190 "Peripheral Timeout Error",
1191 "False Control Error",
1192 "Contention Detected",
1193 "ECC Error, single-bit",
1194 "ECC Error, multi-bit",
1195 "Checksum Error",
1196 "DSI Data Type Not Recognized",
1197 "DSI VC ID Invalid",
1198 "Invalid Transmission Length",
1199 "Reserved",
1200 "DSI Protocol Violation",
1201 };
1202
tegra_dsi_read_response(struct tegra_dsi * dsi,const struct mipi_dsi_msg * msg,size_t count)1203 static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi,
1204 const struct mipi_dsi_msg *msg,
1205 size_t count)
1206 {
1207 u8 *rx = msg->rx_buf;
1208 unsigned int i, j, k;
1209 size_t size = 0;
1210 u16 errors;
1211 u32 value;
1212
1213 /* read and parse packet header */
1214 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1215
1216 switch (value & 0x3f) {
1217 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1218 errors = (value >> 8) & 0xffff;
1219 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n",
1220 errors);
1221 for (i = 0; i < ARRAY_SIZE(error_report); i++)
1222 if (errors & BIT(i))
1223 dev_dbg(dsi->dev, " %2u: %s\n", i,
1224 error_report[i]);
1225 break;
1226
1227 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1228 rx[0] = (value >> 8) & 0xff;
1229 size = 1;
1230 break;
1231
1232 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1233 rx[0] = (value >> 8) & 0xff;
1234 rx[1] = (value >> 16) & 0xff;
1235 size = 2;
1236 break;
1237
1238 case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
1239 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1240 break;
1241
1242 case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
1243 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1244 break;
1245
1246 default:
1247 dev_err(dsi->dev, "unhandled response type: %02x\n",
1248 value & 0x3f);
1249 return -EPROTO;
1250 }
1251
1252 size = min(size, msg->rx_len);
1253
1254 if (msg->rx_buf && size > 0) {
1255 for (i = 0, j = 0; i < count - 1; i++, j += 4) {
1256 u8 *rx = msg->rx_buf + j;
1257
1258 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1259
1260 for (k = 0; k < 4 && (j + k) < msg->rx_len; k++)
1261 rx[j + k] = (value >> (k << 3)) & 0xff;
1262 }
1263 }
1264
1265 return size;
1266 }
1267
tegra_dsi_transmit(struct tegra_dsi * dsi,unsigned long timeout)1268 static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout)
1269 {
1270 tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER);
1271
1272 timeout = jiffies + msecs_to_jiffies(timeout);
1273
1274 while (time_before(jiffies, timeout)) {
1275 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
1276 if ((value & DSI_TRIGGER_HOST) == 0)
1277 return 0;
1278
1279 usleep_range(1000, 2000);
1280 }
1281
1282 DRM_DEBUG_KMS("timeout waiting for transmission to complete\n");
1283 return -ETIMEDOUT;
1284 }
1285
tegra_dsi_wait_for_response(struct tegra_dsi * dsi,unsigned long timeout)1286 static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi,
1287 unsigned long timeout)
1288 {
1289 timeout = jiffies + msecs_to_jiffies(250);
1290
1291 while (time_before(jiffies, timeout)) {
1292 u32 value = tegra_dsi_readl(dsi, DSI_STATUS);
1293 u8 count = value & 0x1f;
1294
1295 if (count > 0)
1296 return count;
1297
1298 usleep_range(1000, 2000);
1299 }
1300
1301 DRM_DEBUG_KMS("peripheral returned no data\n");
1302 return -ETIMEDOUT;
1303 }
1304
tegra_dsi_writesl(struct tegra_dsi * dsi,unsigned long offset,const void * buffer,size_t size)1305 static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset,
1306 const void *buffer, size_t size)
1307 {
1308 const u8 *buf = buffer;
1309 size_t i, j;
1310 u32 value;
1311
1312 for (j = 0; j < size; j += 4) {
1313 value = 0;
1314
1315 for (i = 0; i < 4 && j + i < size; i++)
1316 value |= buf[j + i] << (i << 3);
1317
1318 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1319 }
1320 }
1321
tegra_dsi_host_transfer(struct mipi_dsi_host * host,const struct mipi_dsi_msg * msg)1322 static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host,
1323 const struct mipi_dsi_msg *msg)
1324 {
1325 struct tegra_dsi *dsi = host_to_tegra(host);
1326 struct mipi_dsi_packet packet;
1327 const u8 *header;
1328 size_t count;
1329 ssize_t err;
1330 u32 value;
1331
1332 err = mipi_dsi_create_packet(&packet, msg);
1333 if (err < 0)
1334 return err;
1335
1336 header = packet.header;
1337
1338 /* maximum FIFO depth is 1920 words */
1339 if (packet.size > dsi->video_fifo_depth * 4)
1340 return -ENOSPC;
1341
1342 /* reset underflow/overflow flags */
1343 value = tegra_dsi_readl(dsi, DSI_STATUS);
1344 if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) {
1345 value = DSI_HOST_CONTROL_FIFO_RESET;
1346 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1347 usleep_range(10, 20);
1348 }
1349
1350 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
1351 value |= DSI_POWER_CONTROL_ENABLE;
1352 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
1353
1354 usleep_range(5000, 10000);
1355
1356 value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST |
1357 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC;
1358
1359 if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0)
1360 value |= DSI_HOST_CONTROL_HS;
1361
1362 /*
1363 * The host FIFO has a maximum of 64 words, so larger transmissions
1364 * need to use the video FIFO.
1365 */
1366 if (packet.size > dsi->host_fifo_depth * 4)
1367 value |= DSI_HOST_CONTROL_FIFO_SEL;
1368
1369 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1370
1371 /*
1372 * For reads and messages with explicitly requested ACK, generate a
1373 * BTA sequence after the transmission of the packet.
1374 */
1375 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1376 (msg->rx_buf && msg->rx_len > 0)) {
1377 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
1378 value |= DSI_HOST_CONTROL_PKT_BTA;
1379 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1380 }
1381
1382 value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE;
1383 tegra_dsi_writel(dsi, value, DSI_CONTROL);
1384
1385 /* write packet header, ECC is generated by hardware */
1386 value = header[2] << 16 | header[1] << 8 | header[0];
1387 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1388
1389 /* write payload (if any) */
1390 if (packet.payload_length > 0)
1391 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload,
1392 packet.payload_length);
1393
1394 err = tegra_dsi_transmit(dsi, 250);
1395 if (err < 0)
1396 return err;
1397
1398 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1399 (msg->rx_buf && msg->rx_len > 0)) {
1400 err = tegra_dsi_wait_for_response(dsi, 250);
1401 if (err < 0)
1402 return err;
1403
1404 count = err;
1405
1406 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1407 switch (value) {
1408 case 0x84:
1409 /*
1410 dev_dbg(dsi->dev, "ACK\n");
1411 */
1412 break;
1413
1414 case 0x87:
1415 /*
1416 dev_dbg(dsi->dev, "ESCAPE\n");
1417 */
1418 break;
1419
1420 default:
1421 dev_err(dsi->dev, "unknown status: %08x\n", value);
1422 break;
1423 }
1424
1425 if (count > 1) {
1426 err = tegra_dsi_read_response(dsi, msg, count);
1427 if (err < 0)
1428 dev_err(dsi->dev,
1429 "failed to parse response: %zd\n",
1430 err);
1431 else {
1432 /*
1433 * For read commands, return the number of
1434 * bytes returned by the peripheral.
1435 */
1436 count = err;
1437 }
1438 }
1439 } else {
1440 /*
1441 * For write commands, we have transmitted the 4-byte header
1442 * plus the variable-length payload.
1443 */
1444 count = 4 + packet.payload_length;
1445 }
1446
1447 return count;
1448 }
1449
tegra_dsi_ganged_setup(struct tegra_dsi * dsi)1450 static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi)
1451 {
1452 struct clk *parent;
1453 int err;
1454
1455 /* make sure both DSI controllers share the same PLL */
1456 parent = clk_get_parent(dsi->slave->clk);
1457 if (!parent)
1458 return -EINVAL;
1459
1460 err = clk_set_parent(parent, dsi->clk_parent);
1461 if (err < 0)
1462 return err;
1463
1464 return 0;
1465 }
1466
tegra_dsi_host_attach(struct mipi_dsi_host * host,struct mipi_dsi_device * device)1467 static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
1468 struct mipi_dsi_device *device)
1469 {
1470 struct tegra_dsi *dsi = host_to_tegra(host);
1471
1472 dsi->flags = device->mode_flags;
1473 dsi->format = device->format;
1474 dsi->lanes = device->lanes;
1475
1476 if (dsi->slave) {
1477 int err;
1478
1479 dev_dbg(dsi->dev, "attaching dual-channel device %s\n",
1480 dev_name(&device->dev));
1481
1482 err = tegra_dsi_ganged_setup(dsi);
1483 if (err < 0) {
1484 dev_err(dsi->dev, "failed to set up ganged mode: %d\n",
1485 err);
1486 return err;
1487 }
1488 }
1489
1490 /*
1491 * Slaves don't have a panel associated with them, so they provide
1492 * merely the second channel.
1493 */
1494 if (!dsi->master) {
1495 struct tegra_output *output = &dsi->output;
1496
1497 output->panel = of_drm_find_panel(device->dev.of_node);
1498 if (IS_ERR(output->panel))
1499 output->panel = NULL;
1500
1501 if (output->panel && output->connector.dev)
1502 drm_helper_hpd_irq_event(output->connector.dev);
1503 }
1504
1505 return 0;
1506 }
1507
tegra_dsi_host_detach(struct mipi_dsi_host * host,struct mipi_dsi_device * device)1508 static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
1509 struct mipi_dsi_device *device)
1510 {
1511 struct tegra_dsi *dsi = host_to_tegra(host);
1512 struct tegra_output *output = &dsi->output;
1513
1514 if (output->panel && &device->dev == output->panel->dev) {
1515 output->panel = NULL;
1516
1517 if (output->connector.dev)
1518 drm_helper_hpd_irq_event(output->connector.dev);
1519 }
1520
1521 return 0;
1522 }
1523
1524 static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
1525 .attach = tegra_dsi_host_attach,
1526 .detach = tegra_dsi_host_detach,
1527 .transfer = tegra_dsi_host_transfer,
1528 };
1529
tegra_dsi_ganged_probe(struct tegra_dsi * dsi)1530 static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
1531 {
1532 struct device_node *np;
1533
1534 np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0);
1535 if (np) {
1536 struct platform_device *gangster = of_find_device_by_node(np);
1537
1538 dsi->slave = platform_get_drvdata(gangster);
1539 of_node_put(np);
1540
1541 if (!dsi->slave) {
1542 put_device(&gangster->dev);
1543 return -EPROBE_DEFER;
1544 }
1545
1546 dsi->slave->master = dsi;
1547 }
1548
1549 return 0;
1550 }
1551
tegra_dsi_probe(struct platform_device * pdev)1552 static int tegra_dsi_probe(struct platform_device *pdev)
1553 {
1554 struct tegra_dsi *dsi;
1555 struct resource *regs;
1556 int err;
1557
1558 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
1559 if (!dsi)
1560 return -ENOMEM;
1561
1562 dsi->output.dev = dsi->dev = &pdev->dev;
1563 dsi->video_fifo_depth = 1920;
1564 dsi->host_fifo_depth = 64;
1565
1566 err = tegra_dsi_ganged_probe(dsi);
1567 if (err < 0)
1568 return err;
1569
1570 err = tegra_output_probe(&dsi->output);
1571 if (err < 0)
1572 return err;
1573
1574 dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD;
1575
1576 /*
1577 * Assume these values by default. When a DSI peripheral driver
1578 * attaches to the DSI host, the parameters will be taken from
1579 * the attached device.
1580 */
1581 dsi->flags = MIPI_DSI_MODE_VIDEO;
1582 dsi->format = MIPI_DSI_FMT_RGB888;
1583 dsi->lanes = 4;
1584
1585 if (!pdev->dev.pm_domain) {
1586 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
1587 if (IS_ERR(dsi->rst))
1588 return PTR_ERR(dsi->rst);
1589 }
1590
1591 dsi->clk = devm_clk_get(&pdev->dev, NULL);
1592 if (IS_ERR(dsi->clk)) {
1593 dev_err(&pdev->dev, "cannot get DSI clock\n");
1594 return PTR_ERR(dsi->clk);
1595 }
1596
1597 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
1598 if (IS_ERR(dsi->clk_lp)) {
1599 dev_err(&pdev->dev, "cannot get low-power clock\n");
1600 return PTR_ERR(dsi->clk_lp);
1601 }
1602
1603 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
1604 if (IS_ERR(dsi->clk_parent)) {
1605 dev_err(&pdev->dev, "cannot get parent clock\n");
1606 return PTR_ERR(dsi->clk_parent);
1607 }
1608
1609 dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");
1610 if (IS_ERR(dsi->vdd)) {
1611 dev_err(&pdev->dev, "cannot get VDD supply\n");
1612 return PTR_ERR(dsi->vdd);
1613 }
1614
1615 err = tegra_dsi_setup_clocks(dsi);
1616 if (err < 0) {
1617 dev_err(&pdev->dev, "cannot setup clocks\n");
1618 return err;
1619 }
1620
1621 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1622 dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
1623 if (IS_ERR(dsi->regs))
1624 return PTR_ERR(dsi->regs);
1625
1626 dsi->mipi = tegra_mipi_request(&pdev->dev, pdev->dev.of_node);
1627 if (IS_ERR(dsi->mipi))
1628 return PTR_ERR(dsi->mipi);
1629
1630 dsi->host.ops = &tegra_dsi_host_ops;
1631 dsi->host.dev = &pdev->dev;
1632
1633 err = mipi_dsi_host_register(&dsi->host);
1634 if (err < 0) {
1635 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
1636 goto mipi_free;
1637 }
1638
1639 platform_set_drvdata(pdev, dsi);
1640 pm_runtime_enable(&pdev->dev);
1641
1642 INIT_LIST_HEAD(&dsi->client.list);
1643 dsi->client.ops = &dsi_client_ops;
1644 dsi->client.dev = &pdev->dev;
1645
1646 err = host1x_client_register(&dsi->client);
1647 if (err < 0) {
1648 dev_err(&pdev->dev, "failed to register host1x client: %d\n",
1649 err);
1650 goto unregister;
1651 }
1652
1653 return 0;
1654
1655 unregister:
1656 mipi_dsi_host_unregister(&dsi->host);
1657 mipi_free:
1658 tegra_mipi_free(dsi->mipi);
1659 return err;
1660 }
1661
tegra_dsi_remove(struct platform_device * pdev)1662 static int tegra_dsi_remove(struct platform_device *pdev)
1663 {
1664 struct tegra_dsi *dsi = platform_get_drvdata(pdev);
1665 int err;
1666
1667 pm_runtime_disable(&pdev->dev);
1668
1669 err = host1x_client_unregister(&dsi->client);
1670 if (err < 0) {
1671 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
1672 err);
1673 return err;
1674 }
1675
1676 tegra_output_remove(&dsi->output);
1677
1678 mipi_dsi_host_unregister(&dsi->host);
1679 tegra_mipi_free(dsi->mipi);
1680
1681 return 0;
1682 }
1683
1684 static const struct of_device_id tegra_dsi_of_match[] = {
1685 { .compatible = "nvidia,tegra210-dsi", },
1686 { .compatible = "nvidia,tegra132-dsi", },
1687 { .compatible = "nvidia,tegra124-dsi", },
1688 { .compatible = "nvidia,tegra114-dsi", },
1689 { },
1690 };
1691 MODULE_DEVICE_TABLE(of, tegra_dsi_of_match);
1692
1693 struct platform_driver tegra_dsi_driver = {
1694 .driver = {
1695 .name = "tegra-dsi",
1696 .of_match_table = tegra_dsi_of_match,
1697 },
1698 .probe = tegra_dsi_probe,
1699 .remove = tegra_dsi_remove,
1700 };
1701