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drm/tegra: Add DSI support
[mirror_ubuntu-eoan-kernel.git] / drivers / gpu / drm / tegra / dsi.c
CommitLineData
dec72739
TR		 1/*
2 * Copyright (C) 2013 NVIDIA Corporation
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23#include <linux/clk.h>
24#include <linux/debugfs.h>
25#include <linux/host1x.h>
26#include <linux/module.h>
27#include <linux/of.h>
28#include <linux/platform_device.h>
29#include <linux/reset.h>
30
31#include <drm/drm_mipi_dsi.h>
32#include <drm/drm_panel.h>
33
34#include <video/mipi_display.h>
35
36#include "dc.h"
37#include "drm.h"
38#include "dsi.h"
39#include "mipi-phy.h"
40
41#define DSI_VIDEO_FIFO_DEPTH (1920 / 4)
42#define DSI_HOST_FIFO_DEPTH 64
43
44struct tegra_dsi {
45 struct host1x_client client;
46 struct tegra_output output;
47 struct device *dev;
48
49 void __iomem *regs;
50
51 struct reset_control *rst;
52 struct clk *clk_parent;
53 struct clk *clk_lp;
54 struct clk *clk;
55
56 struct drm_info_list *debugfs_files;
57 struct drm_minor *minor;
58 struct dentry *debugfs;
59
60 enum mipi_dsi_pixel_format format;
61 unsigned int lanes;
62
63 struct tegra_mipi_device *mipi;
64 struct mipi_dsi_host host;
65};
66
67static inline struct tegra_dsi *
68host1x_client_to_dsi(struct host1x_client *client)
69{
70 return container_of(client, struct tegra_dsi, client);
71}
72
73static inline struct tegra_dsi *host_to_tegra(struct mipi_dsi_host *host)
74{
75 return container_of(host, struct tegra_dsi, host);
76}
77
78static inline struct tegra_dsi *to_dsi(struct tegra_output *output)
79{
80 return container_of(output, struct tegra_dsi, output);
81}
82
83static inline unsigned long tegra_dsi_readl(struct tegra_dsi *dsi,
84 unsigned long reg)
85{
86 return readl(dsi->regs + (reg << 2));
87}
88
89static inline void tegra_dsi_writel(struct tegra_dsi *dsi, unsigned long value,
90 unsigned long reg)
91{
92 writel(value, dsi->regs + (reg << 2));
93}
94
95static int tegra_dsi_show_regs(struct seq_file *s, void *data)
96{
97 struct drm_info_node *node = s->private;
98 struct tegra_dsi *dsi = node->info_ent->data;
99
100#define DUMP_REG(name) \
101 seq_printf(s, "%-32s %#05x %08lx\n", #name, name, \
102 tegra_dsi_readl(dsi, name))
103
104 DUMP_REG(DSI_INCR_SYNCPT);
105 DUMP_REG(DSI_INCR_SYNCPT_CONTROL);
106 DUMP_REG(DSI_INCR_SYNCPT_ERROR);
107 DUMP_REG(DSI_CTXSW);
108 DUMP_REG(DSI_RD_DATA);
109 DUMP_REG(DSI_WR_DATA);
110 DUMP_REG(DSI_POWER_CONTROL);
111 DUMP_REG(DSI_INT_ENABLE);
112 DUMP_REG(DSI_INT_STATUS);
113 DUMP_REG(DSI_INT_MASK);
114 DUMP_REG(DSI_HOST_CONTROL);
115 DUMP_REG(DSI_CONTROL);
116 DUMP_REG(DSI_SOL_DELAY);
117 DUMP_REG(DSI_MAX_THRESHOLD);
118 DUMP_REG(DSI_TRIGGER);
119 DUMP_REG(DSI_TX_CRC);
120 DUMP_REG(DSI_STATUS);
121
122 DUMP_REG(DSI_INIT_SEQ_CONTROL);
123 DUMP_REG(DSI_INIT_SEQ_DATA_0);
124 DUMP_REG(DSI_INIT_SEQ_DATA_1);
125 DUMP_REG(DSI_INIT_SEQ_DATA_2);
126 DUMP_REG(DSI_INIT_SEQ_DATA_3);
127 DUMP_REG(DSI_INIT_SEQ_DATA_4);
128 DUMP_REG(DSI_INIT_SEQ_DATA_5);
129 DUMP_REG(DSI_INIT_SEQ_DATA_6);
130 DUMP_REG(DSI_INIT_SEQ_DATA_7);
131
132 DUMP_REG(DSI_PKT_SEQ_0_LO);
133 DUMP_REG(DSI_PKT_SEQ_0_HI);
134 DUMP_REG(DSI_PKT_SEQ_1_LO);
135 DUMP_REG(DSI_PKT_SEQ_1_HI);
136 DUMP_REG(DSI_PKT_SEQ_2_LO);
137 DUMP_REG(DSI_PKT_SEQ_2_HI);
138 DUMP_REG(DSI_PKT_SEQ_3_LO);
139 DUMP_REG(DSI_PKT_SEQ_3_HI);
140 DUMP_REG(DSI_PKT_SEQ_4_LO);
141 DUMP_REG(DSI_PKT_SEQ_4_HI);
142 DUMP_REG(DSI_PKT_SEQ_5_LO);
143 DUMP_REG(DSI_PKT_SEQ_5_HI);
144
145 DUMP_REG(DSI_DCS_CMDS);
146
147 DUMP_REG(DSI_PKT_LEN_0_1);
148 DUMP_REG(DSI_PKT_LEN_2_3);
149 DUMP_REG(DSI_PKT_LEN_4_5);
150 DUMP_REG(DSI_PKT_LEN_6_7);
151
152 DUMP_REG(DSI_PHY_TIMING_0);
153 DUMP_REG(DSI_PHY_TIMING_1);
154 DUMP_REG(DSI_PHY_TIMING_2);
155 DUMP_REG(DSI_BTA_TIMING);
156
157 DUMP_REG(DSI_TIMEOUT_0);
158 DUMP_REG(DSI_TIMEOUT_1);
159 DUMP_REG(DSI_TO_TALLY);
160
161 DUMP_REG(DSI_PAD_CONTROL_0);
162 DUMP_REG(DSI_PAD_CONTROL_CD);
163 DUMP_REG(DSI_PAD_CD_STATUS);
164 DUMP_REG(DSI_VIDEO_MODE_CONTROL);
165 DUMP_REG(DSI_PAD_CONTROL_1);
166 DUMP_REG(DSI_PAD_CONTROL_2);
167 DUMP_REG(DSI_PAD_CONTROL_3);
168 DUMP_REG(DSI_PAD_CONTROL_4);
169
170 DUMP_REG(DSI_GANGED_MODE_CONTROL);
171 DUMP_REG(DSI_GANGED_MODE_START);
172 DUMP_REG(DSI_GANGED_MODE_SIZE);
173
174 DUMP_REG(DSI_RAW_DATA_BYTE_COUNT);
175 DUMP_REG(DSI_ULTRA_LOW_POWER_CONTROL);
176
177 DUMP_REG(DSI_INIT_SEQ_DATA_8);
178 DUMP_REG(DSI_INIT_SEQ_DATA_9);
179 DUMP_REG(DSI_INIT_SEQ_DATA_10);
180 DUMP_REG(DSI_INIT_SEQ_DATA_11);
181 DUMP_REG(DSI_INIT_SEQ_DATA_12);
182 DUMP_REG(DSI_INIT_SEQ_DATA_13);
183 DUMP_REG(DSI_INIT_SEQ_DATA_14);
184 DUMP_REG(DSI_INIT_SEQ_DATA_15);
185
186#undef DUMP_REG
187
188 return 0;
189}
190
191static struct drm_info_list debugfs_files[] = {
192 { "regs", tegra_dsi_show_regs, 0, NULL },
193};
194
195static int tegra_dsi_debugfs_init(struct tegra_dsi *dsi,
196 struct drm_minor *minor)
197{
198 const char *name = dev_name(dsi->dev);
199 unsigned int i;
200 int err;
201
202 dsi->debugfs = debugfs_create_dir(name, minor->debugfs_root);
203 if (!dsi->debugfs)
204 return -ENOMEM;
205
206 dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
207 GFP_KERNEL);
208 if (!dsi->debugfs_files) {
209 err = -ENOMEM;
210 goto remove;
211 }
212
213 for (i = 0; i < ARRAY_SIZE(debugfs_files); i++)
214 dsi->debugfs_files[i].data = dsi;
215
216 err = drm_debugfs_create_files(dsi->debugfs_files,
217 ARRAY_SIZE(debugfs_files),
218 dsi->debugfs, minor);
219 if (err < 0)
220 goto free;
221
222 dsi->minor = minor;
223
224 return 0;
225
226free:
227 kfree(dsi->debugfs_files);
228 dsi->debugfs_files = NULL;
229remove:
230 debugfs_remove(dsi->debugfs);
231 dsi->debugfs = NULL;
232
233 return err;
234}
235
236static int tegra_dsi_debugfs_exit(struct tegra_dsi *dsi)
237{
238 drm_debugfs_remove_files(dsi->debugfs_files, ARRAY_SIZE(debugfs_files),
239 dsi->minor);
240 dsi->minor = NULL;
241
242 kfree(dsi->debugfs_files);
243 dsi->debugfs_files = NULL;
244
245 debugfs_remove(dsi->debugfs);
246 dsi->debugfs = NULL;
247
248 return 0;
249}
250
251#define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9))
252#define PKT_LEN0(len) (((len) & 0x07) << 0)
253#define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19))
254#define PKT_LEN1(len) (((len) & 0x07) << 10)
255#define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29))
256#define PKT_LEN2(len) (((len) & 0x07) << 20)
257
258#define PKT_LP (1 << 30)
259#define NUM_PKT_SEQ 12
260
261/* non-burst mode with sync-end */
262static const u32 pkt_seq_vnb_syne[NUM_PKT_SEQ] = {
263 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
264 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
265 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
266 PKT_LP,
267 [ 1] = 0,
268 [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) |
269 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
270 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
271 PKT_LP,
272 [ 3] = 0,
273 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
274 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
275 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
276 PKT_LP,
277 [ 5] = 0,
278 [ 6] = PKT_ID0(MIPI_DSI_H_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 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
282 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
283 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
284 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
285 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
286 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
287 PKT_LP,
288 [ 9] = 0,
289 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
290 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
291 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
292 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
293 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
294 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
295};
296
297static int tegra_dsi_set_phy_timing(struct tegra_dsi *dsi)
298{
299 struct mipi_dphy_timing timing;
300 unsigned long value, period;
301 long rate;
302 int err;
303
304 rate = clk_get_rate(dsi->clk);
305 if (rate < 0)
306 return rate;
307
308 period = DIV_ROUND_CLOSEST(1000000000UL, rate * 2);
309
310 err = mipi_dphy_timing_get_default(&timing, period);
311 if (err < 0)
312 return err;
313
314 err = mipi_dphy_timing_validate(&timing, period);
315 if (err < 0) {
316 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
317 return err;
318 }
319
320 /*
321 * The D-PHY timing fields below are expressed in byte-clock cycles,
322 * so multiply the period by 8.
323 */
324 period *= 8;
325
326 value = DSI_TIMING_FIELD(timing.hsexit, period, 1) << 24 |
327 DSI_TIMING_FIELD(timing.hstrail, period, 0) << 16 |
328 DSI_TIMING_FIELD(timing.hszero, period, 3) << 8 |
329 DSI_TIMING_FIELD(timing.hsprepare, period, 1);
330 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0);
331
332 value = DSI_TIMING_FIELD(timing.clktrail, period, 1) << 24 |
333 DSI_TIMING_FIELD(timing.clkpost, period, 1) << 16 |
334 DSI_TIMING_FIELD(timing.clkzero, period, 1) << 8 |
335 DSI_TIMING_FIELD(timing.lpx, period, 1);
336 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1);
337
338 value = DSI_TIMING_FIELD(timing.clkprepare, period, 1) << 16 |
339 DSI_TIMING_FIELD(timing.clkpre, period, 1) << 8 |
340 DSI_TIMING_FIELD(0xff * period, period, 0) << 0;
341 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2);
342
343 value = DSI_TIMING_FIELD(timing.taget, period, 1) << 16 |
344 DSI_TIMING_FIELD(timing.tasure, period, 1) << 8 |
345 DSI_TIMING_FIELD(timing.tago, period, 1);
346 tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);
347
348 return 0;
349}
350
351static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,
352 unsigned int *mulp, unsigned int *divp)
353{
354 switch (format) {
355 case MIPI_DSI_FMT_RGB666_PACKED:
356 case MIPI_DSI_FMT_RGB888:
357 *mulp = 3;
358 *divp = 1;
359 break;
360
361 case MIPI_DSI_FMT_RGB565:
362 *mulp = 2;
363 *divp = 1;
364 break;
365
366 case MIPI_DSI_FMT_RGB666:
367 *mulp = 9;
368 *divp = 4;
369 break;
370
371 default:
372 return -EINVAL;
373 }
374
375 return 0;
376}
377
378static int tegra_output_dsi_enable(struct tegra_output *output)
379{
380 struct tegra_dc *dc = to_tegra_dc(output->encoder.crtc);
381 struct drm_display_mode *mode = &dc->base.mode;
382 unsigned int hact, hsw, hbp, hfp, i, mul, div;
383 struct tegra_dsi *dsi = to_dsi(output);
384 /* FIXME: don't hardcode this */
385 const u32 *pkt_seq = pkt_seq_vnb_syne;
386 unsigned long value;
387 int err;
388
389 err = tegra_dsi_get_muldiv(dsi->format, &mul, &div);
390 if (err < 0)
391 return err;
392
393 err = clk_enable(dsi->clk);
394 if (err < 0)
395 return err;
396
397 reset_control_deassert(dsi->rst);
398
399 value = DSI_CONTROL_CHANNEL(0) | DSI_CONTROL_FORMAT(dsi->format) |
400 DSI_CONTROL_LANES(dsi->lanes - 1) |
401 DSI_CONTROL_SOURCE(dc->pipe);
402 tegra_dsi_writel(dsi, value, DSI_CONTROL);
403
404 tegra_dsi_writel(dsi, DSI_VIDEO_FIFO_DEPTH, DSI_MAX_THRESHOLD);
405
406 value = DSI_HOST_CONTROL_HS | DSI_HOST_CONTROL_CS |
407 DSI_HOST_CONTROL_ECC;
408 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
409
410 value = tegra_dsi_readl(dsi, DSI_CONTROL);
411 value |= DSI_CONTROL_HS_CLK_CTRL;
412 value &= ~DSI_CONTROL_TX_TRIG(3);
413 value &= ~DSI_CONTROL_DCS_ENABLE;
414 value |= DSI_CONTROL_VIDEO_ENABLE;
415 value &= ~DSI_CONTROL_HOST_ENABLE;
416 tegra_dsi_writel(dsi, value, DSI_CONTROL);
417
418 err = tegra_dsi_set_phy_timing(dsi);
419 if (err < 0)
420 return err;
421
422 for (i = 0; i < NUM_PKT_SEQ; i++)
423 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);
424
425 /* horizontal active pixels */
426 hact = mode->hdisplay * mul / div;
427
428 /* horizontal sync width */
429 hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
430 hsw -= 10;
431
432 /* horizontal back porch */
433 hbp = (mode->htotal - mode->hsync_end) * mul / div;
434 hbp -= 14;
435
436 /* horizontal front porch */
437 hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
438 hfp -= 8;
439
440 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);
441 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3);
442 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5);
443 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7);
444
445 /* set SOL delay */
446 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY);
447
448 /* enable display controller */
449 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
450 value |= DSI_ENABLE;
451 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
452
453 value = PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
454 PW4_ENABLE | PM0_ENABLE | PM1_ENABLE;
455 tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);
456
457 value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
458 value &= ~DISP_CTRL_MODE_MASK;
459 value |= DISP_CTRL_MODE_C_DISPLAY;
460 tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);
461
462 tegra_dc_writel(dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
463 tegra_dc_writel(dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);
464
465 /* enable DSI controller */
466 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
467 value |= DSI_POWER_CONTROL_ENABLE;
468 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
469
470 return 0;
471}
472
473static int tegra_output_dsi_disable(struct tegra_output *output)
474{
475 struct tegra_dc *dc = to_tegra_dc(output->encoder.crtc);
476 struct tegra_dsi *dsi = to_dsi(output);
477 unsigned long value;
478
479 /* disable DSI controller */
480 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
481 value &= DSI_POWER_CONTROL_ENABLE;
482 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
483
484 /*
485 * FIXME: The output isn't attached to any CRTC when it's being
486 * disabled, so the following will never be executed.
487 */
488 if (dc) {
489 /* disable display controller */
490 value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
491 value &= ~DISP_CTRL_MODE_MASK;
492 tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);
493
494 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
495 value &= ~DSI_ENABLE;
496 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
497 }
498
499 clk_disable(dsi->clk);
500
501 return 0;
502}
503
504static int tegra_output_dsi_setup_clock(struct tegra_output *output,
505 struct clk *clk, unsigned long pclk)
506{
507 struct tegra_dc *dc = to_tegra_dc(output->encoder.crtc);
508 struct drm_display_mode *mode = &dc->base.mode;
509 unsigned int timeout, mul, div, vrefresh;
510 struct tegra_dsi *dsi = to_dsi(output);
511 unsigned long bclk, plld, value;
512 struct clk *base;
513 int err;
514
515 err = tegra_dsi_get_muldiv(dsi->format, &mul, &div);
516 if (err < 0)
517 return err;
518
519 vrefresh = drm_mode_vrefresh(mode);
520
521 pclk = mode->htotal * mode->vtotal * vrefresh;
522 bclk = (pclk * mul) / (div * dsi->lanes);
523 plld = DIV_ROUND_UP(bclk * 8, 1000000);
524 pclk = (plld * 1000000) / 2;
525
526 err = clk_set_parent(clk, dsi->clk_parent);
527 if (err < 0) {
528 dev_err(dsi->dev, "failed to set parent clock: %d\n", err);
529 return err;
530 }
531
532 base = clk_get_parent(dsi->clk_parent);
533
534 /*
535 * This assumes that the parent clock is pll_d_out0 or pll_d2_out
536 * respectively, each of which divides the base pll_d by 2.
537 */
538 err = clk_set_rate(base, pclk * 2);
539 if (err < 0) {
540 dev_err(dsi->dev, "failed to set base clock rate to %lu Hz\n",
541 pclk * 2);
542 return err;
543 }
544
545 /*
546 * XXX: Move the below somewhere else so that we don't need to have
547 * access to the vrefresh in this function?
548 */
549
550 /* one frame high-speed transmission timeout */
551 timeout = (bclk / vrefresh) / 512;
552 value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout);
553 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0);
554
555 /* 2 ms peripheral timeout for panel */
556 timeout = 2 * bclk / 512 * 1000;
557 value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000);
558 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1);
559
560 value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0);
561 tegra_dsi_writel(dsi, value, DSI_TO_TALLY);
562
563 return 0;
564}
565
566static int tegra_output_dsi_check_mode(struct tegra_output *output,
567 struct drm_display_mode *mode,
568 enum drm_mode_status *status)
569{
570 /*
571 * FIXME: For now, always assume that the mode is okay.
572 */
573
574 *status = MODE_OK;
575
576 return 0;
577}
578
579static const struct tegra_output_ops dsi_ops = {
580 .enable = tegra_output_dsi_enable,
581 .disable = tegra_output_dsi_disable,
582 .setup_clock = tegra_output_dsi_setup_clock,
583 .check_mode = tegra_output_dsi_check_mode,
584};
585
586static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
587{
588 unsigned long value;
589
590 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
591 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
592
593 return 0;
594}
595
596static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
597{
598 unsigned long value;
599
600 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
601 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
602 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
603 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
604 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
605
606 /* start calibration */
607 tegra_dsi_pad_enable(dsi);
608
609 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
610 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
611 DSI_PAD_OUT_CLK(0x0);
612 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);
613
614 return tegra_mipi_calibrate(dsi->mipi);
615}
616
617static int tegra_dsi_init(struct host1x_client *client)
618{
619 struct tegra_drm *tegra = dev_get_drvdata(client->parent);
620 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
621 unsigned long value, i;
622 int err;
623
624 dsi->output.type = TEGRA_OUTPUT_DSI;
625 dsi->output.dev = client->dev;
626 dsi->output.ops = &dsi_ops;
627
628 err = tegra_output_init(tegra->drm, &dsi->output);
629 if (err < 0) {
630 dev_err(client->dev, "output setup failed: %d\n", err);
631 return err;
632 }
633
634 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
635 err = tegra_dsi_debugfs_init(dsi, tegra->drm->primary);
636 if (err < 0)
637 dev_err(dsi->dev, "debugfs setup failed: %d\n", err);
638 }
639
640 /*
641 * enable high-speed mode, checksum generation, ECC generation and
642 * disable raw mode
643 */
644 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
645 value |= DSI_HOST_CONTROL_ECC | DSI_HOST_CONTROL_CS |
646 DSI_HOST_CONTROL_HS;
647 value &= ~DSI_HOST_CONTROL_RAW;
648 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
649
650 tegra_dsi_writel(dsi, 0, DSI_SOL_DELAY);
651 tegra_dsi_writel(dsi, 0, DSI_MAX_THRESHOLD);
652
653 tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_CONTROL);
654
655 for (i = 0; i < 8; i++) {
656 tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_0 + i);
657 tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_8 + i);
658 }
659
660 for (i = 0; i < 12; i++)
661 tegra_dsi_writel(dsi, 0, DSI_PKT_SEQ_0_LO + i);
662
663 tegra_dsi_writel(dsi, 0, DSI_DCS_CMDS);
664
665 err = tegra_dsi_pad_calibrate(dsi);
666 if (err < 0) {
667 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
668 return err;
669 }
670
671 tegra_dsi_writel(dsi, DSI_POWER_CONTROL_ENABLE, DSI_POWER_CONTROL);
672 usleep_range(300, 1000);
673
674 return 0;
675}
676
677static int tegra_dsi_exit(struct host1x_client *client)
678{
679 struct tegra_dsi *dsi = host1x_client_to_dsi(client);
680 int err;
681
682 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
683 err = tegra_dsi_debugfs_exit(dsi);
684 if (err < 0)
685 dev_err(dsi->dev, "debugfs cleanup failed: %d\n", err);
686 }
687
688 err = tegra_output_disable(&dsi->output);
689 if (err < 0) {
690 dev_err(client->dev, "output failed to disable: %d\n", err);
691 return err;
692 }
693
694 err = tegra_output_exit(&dsi->output);
695 if (err < 0) {
696 dev_err(client->dev, "output cleanup failed: %d\n", err);
697 return err;
698 }
699
700 return 0;
701}
702
703static const struct host1x_client_ops dsi_client_ops = {
704 .init = tegra_dsi_init,
705 .exit = tegra_dsi_exit,
706};
707
708static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
709{
710 struct clk *parent;
711 int err;
712
713 parent = clk_get_parent(dsi->clk);
714 if (!parent)
715 return -EINVAL;
716
717 err = clk_set_parent(parent, dsi->clk_parent);
718 if (err < 0)
719 return err;
720
721 return 0;
722}
723
724static void tegra_dsi_initialize(struct tegra_dsi *dsi)
725{
726 unsigned int i;
727
728 tegra_dsi_writel(dsi, 0, DSI_POWER_CONTROL);
729
730 tegra_dsi_writel(dsi, 0, DSI_INT_ENABLE);
731 tegra_dsi_writel(dsi, 0, DSI_INT_STATUS);
732 tegra_dsi_writel(dsi, 0, DSI_INT_MASK);
733
734 tegra_dsi_writel(dsi, 0, DSI_HOST_CONTROL);
735 tegra_dsi_writel(dsi, 0, DSI_CONTROL);
736
737 tegra_dsi_writel(dsi, 0, DSI_SOL_DELAY);
738 tegra_dsi_writel(dsi, 0, DSI_MAX_THRESHOLD);
739
740 tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_CONTROL);
741
742 for (i = 0; i < 8; i++) {
743 tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_0 + i);
744 tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_8 + i);
745 }
746
747 for (i = 0; i < 12; i++)
748 tegra_dsi_writel(dsi, 0, DSI_PKT_SEQ_0_LO + i);
749
750 tegra_dsi_writel(dsi, 0, DSI_DCS_CMDS);
751
752 for (i = 0; i < 4; i++)
753 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1 + i);
754
755 tegra_dsi_writel(dsi, 0x00000000, DSI_PHY_TIMING_0);
756 tegra_dsi_writel(dsi, 0x00000000, DSI_PHY_TIMING_1);
757 tegra_dsi_writel(dsi, 0x000000ff, DSI_PHY_TIMING_2);
758 tegra_dsi_writel(dsi, 0x00000000, DSI_BTA_TIMING);
759
760 tegra_dsi_writel(dsi, 0, DSI_TIMEOUT_0);
761 tegra_dsi_writel(dsi, 0, DSI_TIMEOUT_1);
762 tegra_dsi_writel(dsi, 0, DSI_TO_TALLY);
763
764 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
765 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_CD);
766 tegra_dsi_writel(dsi, 0, DSI_PAD_CD_STATUS);
767 tegra_dsi_writel(dsi, 0, DSI_VIDEO_MODE_CONTROL);
768 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
769 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
770 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
771 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
772
773 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL);
774 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START);
775 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE);
776}
777
778static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
779 struct mipi_dsi_device *device)
780{
781 struct tegra_dsi *dsi = host_to_tegra(host);
782 struct tegra_output *output = &dsi->output;
783
784 dsi->format = device->format;
785 dsi->lanes = device->lanes;
786
787 output->panel = of_drm_find_panel(device->dev.of_node);
788 if (output->panel) {
789 if (output->connector.dev)
790 drm_helper_hpd_irq_event(output->connector.dev);
791 }
792
793 return 0;
794}
795
796static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
797 struct mipi_dsi_device *device)
798{
799 struct tegra_dsi *dsi = host_to_tegra(host);
800 struct tegra_output *output = &dsi->output;
801
802 if (output->panel && &device->dev == output->panel->dev) {
803 if (output->connector.dev)
804 drm_helper_hpd_irq_event(output->connector.dev);
805
806 output->panel = NULL;
807 }
808
809 return 0;
810}
811
812static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
813 .attach = tegra_dsi_host_attach,
814 .detach = tegra_dsi_host_detach,
815};
816
817static int tegra_dsi_probe(struct platform_device *pdev)
818{
819 struct tegra_dsi *dsi;
820 struct resource *regs;
821 int err;
822
823 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
824 if (!dsi)
825 return -ENOMEM;
826
827 dsi->output.dev = dsi->dev = &pdev->dev;
828
829 err = tegra_output_probe(&dsi->output);
830 if (err < 0)
831 return err;
832
833 /*
834 * Assume these values by default. When a DSI peripheral driver
835 * attaches to the DSI host, the parameters will be taken from
836 * the attached device.
837 */
838 dsi->format = MIPI_DSI_FMT_RGB888;
839 dsi->lanes = 4;
840
841 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
842 if (IS_ERR(dsi->rst))
843 return PTR_ERR(dsi->rst);
844
845 dsi->clk = devm_clk_get(&pdev->dev, NULL);
846 if (IS_ERR(dsi->clk)) {
847 dev_err(&pdev->dev, "cannot get DSI clock\n");
848 return PTR_ERR(dsi->clk);
849 }
850
851 err = clk_prepare_enable(dsi->clk);
852 if (err < 0) {
853 dev_err(&pdev->dev, "cannot enable DSI clock\n");
854 return err;
855 }
856
857 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
858 if (IS_ERR(dsi->clk_lp)) {
859 dev_err(&pdev->dev, "cannot get low-power clock\n");
860 return PTR_ERR(dsi->clk_lp);
861 }
862
863 err = clk_prepare_enable(dsi->clk_lp);
864 if (err < 0) {
865 dev_err(&pdev->dev, "cannot enable low-power clock\n");
866 return err;
867 }
868
869 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
870 if (IS_ERR(dsi->clk_parent)) {
871 dev_err(&pdev->dev, "cannot get parent clock\n");
872 return PTR_ERR(dsi->clk_parent);
873 }
874
875 err = clk_prepare_enable(dsi->clk_parent);
876 if (err < 0) {
877 dev_err(&pdev->dev, "cannot enable parent clock\n");
878 return err;
879 }
880
881 err = tegra_dsi_setup_clocks(dsi);
882 if (err < 0) {
883 dev_err(&pdev->dev, "cannot setup clocks\n");
884 return err;
885 }
886
887 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
888 dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
889 if (!dsi->regs)
890 return -EADDRNOTAVAIL;
891
892 tegra_dsi_initialize(dsi);
893
894 dsi->mipi = tegra_mipi_request(&pdev->dev);
895 if (IS_ERR(dsi->mipi))
896 return PTR_ERR(dsi->mipi);
897
898 dsi->host.ops = &tegra_dsi_host_ops;
899 dsi->host.dev = &pdev->dev;
900
901 err = mipi_dsi_host_register(&dsi->host);
902 if (err < 0) {
903 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
904 return err;
905 }
906
907 INIT_LIST_HEAD(&dsi->client.list);
908 dsi->client.ops = &dsi_client_ops;
909 dsi->client.dev = &pdev->dev;
910
911 err = host1x_client_register(&dsi->client);
912 if (err < 0) {
913 dev_err(&pdev->dev, "failed to register host1x client: %d\n",
914 err);
915 return err;
916 }
917
918 platform_set_drvdata(pdev, dsi);
919
920 return 0;
921}
922
923static int tegra_dsi_remove(struct platform_device *pdev)
924{
925 struct tegra_dsi *dsi = platform_get_drvdata(pdev);
926 int err;
927
928 err = host1x_client_unregister(&dsi->client);
929 if (err < 0) {
930 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
931 err);
932 return err;
933 }
934
935 mipi_dsi_host_unregister(&dsi->host);
936 tegra_mipi_free(dsi->mipi);
937
938 clk_disable_unprepare(dsi->clk_parent);
939 clk_disable_unprepare(dsi->clk_lp);
940 clk_disable_unprepare(dsi->clk);
941
942 err = tegra_output_remove(&dsi->output);
943 if (err < 0) {
944 dev_err(&pdev->dev, "failed to remove output: %d\n", err);
945 return err;
946 }
947
948 return 0;
949}
950
951static const struct of_device_id tegra_dsi_of_match[] = {
952 { .compatible = "nvidia,tegra114-dsi", },
953 { },
954};
955
956struct platform_driver tegra_dsi_driver = {
957 .driver = {
958 .name = "tegra-dsi",
959 .of_match_table = tegra_dsi_of_match,
960 },
961 .probe = tegra_dsi_probe,
962 .remove = tegra_dsi_remove,
963};
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