Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

Linux/drivers/gpu/drm/tegra/dsi.c

  1 /*
  2  * Copyright (C) 2013 NVIDIA Corporation
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  */
  8 
  9 #include <linux/clk.h>
 10 #include <linux/debugfs.h>
 11 #include <linux/host1x.h>
 12 #include <linux/module.h>
 13 #include <linux/of.h>
 14 #include <linux/of_platform.h>
 15 #include <linux/platform_device.h>
 16 #include <linux/reset.h>
 17 
 18 #include <linux/regulator/consumer.h>
 19 
 20 #include <drm/drm_atomic_helper.h>
 21 #include <drm/drm_mipi_dsi.h>
 22 #include <drm/drm_panel.h>
 23 
 24 #include <video/mipi_display.h>
 25 
 26 #include "dc.h"
 27 #include "drm.h"
 28 #include "dsi.h"
 29 #include "mipi-phy.h"
 30 
 31 struct tegra_dsi_state {
 32         struct drm_connector_state base;
 33 
 34         struct mipi_dphy_timing timing;
 35         unsigned long period;
 36 
 37         unsigned int vrefresh;
 38         unsigned int lanes;
 39         unsigned long pclk;
 40         unsigned long bclk;
 41 
 42         enum tegra_dsi_format format;
 43         unsigned int mul;
 44         unsigned int div;
 45 };
 46 
 47 static inline struct tegra_dsi_state *
 48 to_dsi_state(struct drm_connector_state *state)
 49 {
 50         return container_of(state, struct tegra_dsi_state, base);
 51 }
 52 
 53 struct tegra_dsi {
 54         struct host1x_client client;
 55         struct tegra_output output;
 56         struct device *dev;
 57 
 58         void __iomem *regs;
 59 
 60         struct reset_control *rst;
 61         struct clk *clk_parent;
 62         struct clk *clk_lp;
 63         struct clk *clk;
 64 
 65         struct drm_info_list *debugfs_files;
 66         struct drm_minor *minor;
 67         struct dentry *debugfs;
 68 
 69         unsigned long flags;
 70         enum mipi_dsi_pixel_format format;
 71         unsigned int lanes;
 72 
 73         struct tegra_mipi_device *mipi;
 74         struct mipi_dsi_host host;
 75 
 76         struct regulator *vdd;
 77 
 78         unsigned int video_fifo_depth;
 79         unsigned int host_fifo_depth;
 80 
 81         /* for ganged-mode support */
 82         struct tegra_dsi *master;
 83         struct tegra_dsi *slave;
 84 };
 85 
 86 static inline struct tegra_dsi *
 87 host1x_client_to_dsi(struct host1x_client *client)
 88 {
 89         return container_of(client, struct tegra_dsi, client);
 90 }
 91 
 92 static inline struct tegra_dsi *host_to_tegra(struct mipi_dsi_host *host)
 93 {
 94         return container_of(host, struct tegra_dsi, host);
 95 }
 96 
 97 static inline struct tegra_dsi *to_dsi(struct tegra_output *output)
 98 {
 99         return container_of(output, struct tegra_dsi, output);
100 }
101 
102 static struct tegra_dsi_state *tegra_dsi_get_state(struct tegra_dsi *dsi)
103 {
104         return to_dsi_state(dsi->output.connector.state);
105 }
106 
107 static inline u32 tegra_dsi_readl(struct tegra_dsi *dsi, unsigned long reg)
108 {
109         return readl(dsi->regs + (reg << 2));
110 }
111 
112 static inline void tegra_dsi_writel(struct tegra_dsi *dsi, u32 value,
113                                     unsigned long reg)
114 {
115         writel(value, dsi->regs + (reg << 2));
116 }
117 
118 static int tegra_dsi_show_regs(struct seq_file *s, void *data)
119 {
120         struct drm_info_node *node = s->private;
121         struct tegra_dsi *dsi = node->info_ent->data;
122         struct drm_crtc *crtc = dsi->output.encoder.crtc;
123         struct drm_device *drm = node->minor->dev;
124         int err = 0;
125 
126         drm_modeset_lock_all(drm);
127 
128         if (!crtc || !crtc->state->active) {
129                 err = -EBUSY;
130                 goto unlock;
131         }
132 
133 #define DUMP_REG(name)                                          \
134         seq_printf(s, "%-32s %#05x %08x\n", #name, name,        \
135                    tegra_dsi_readl(dsi, name))
136 
137         DUMP_REG(DSI_INCR_SYNCPT);
138         DUMP_REG(DSI_INCR_SYNCPT_CONTROL);
139         DUMP_REG(DSI_INCR_SYNCPT_ERROR);
140         DUMP_REG(DSI_CTXSW);
141         DUMP_REG(DSI_RD_DATA);
142         DUMP_REG(DSI_WR_DATA);
143         DUMP_REG(DSI_POWER_CONTROL);
144         DUMP_REG(DSI_INT_ENABLE);
145         DUMP_REG(DSI_INT_STATUS);
146         DUMP_REG(DSI_INT_MASK);
147         DUMP_REG(DSI_HOST_CONTROL);
148         DUMP_REG(DSI_CONTROL);
149         DUMP_REG(DSI_SOL_DELAY);
150         DUMP_REG(DSI_MAX_THRESHOLD);
151         DUMP_REG(DSI_TRIGGER);
152         DUMP_REG(DSI_TX_CRC);
153         DUMP_REG(DSI_STATUS);
154 
155         DUMP_REG(DSI_INIT_SEQ_CONTROL);
156         DUMP_REG(DSI_INIT_SEQ_DATA_0);
157         DUMP_REG(DSI_INIT_SEQ_DATA_1);
158         DUMP_REG(DSI_INIT_SEQ_DATA_2);
159         DUMP_REG(DSI_INIT_SEQ_DATA_3);
160         DUMP_REG(DSI_INIT_SEQ_DATA_4);
161         DUMP_REG(DSI_INIT_SEQ_DATA_5);
162         DUMP_REG(DSI_INIT_SEQ_DATA_6);
163         DUMP_REG(DSI_INIT_SEQ_DATA_7);
164 
165         DUMP_REG(DSI_PKT_SEQ_0_LO);
166         DUMP_REG(DSI_PKT_SEQ_0_HI);
167         DUMP_REG(DSI_PKT_SEQ_1_LO);
168         DUMP_REG(DSI_PKT_SEQ_1_HI);
169         DUMP_REG(DSI_PKT_SEQ_2_LO);
170         DUMP_REG(DSI_PKT_SEQ_2_HI);
171         DUMP_REG(DSI_PKT_SEQ_3_LO);
172         DUMP_REG(DSI_PKT_SEQ_3_HI);
173         DUMP_REG(DSI_PKT_SEQ_4_LO);
174         DUMP_REG(DSI_PKT_SEQ_4_HI);
175         DUMP_REG(DSI_PKT_SEQ_5_LO);
176         DUMP_REG(DSI_PKT_SEQ_5_HI);
177 
178         DUMP_REG(DSI_DCS_CMDS);
179 
180         DUMP_REG(DSI_PKT_LEN_0_1);
181         DUMP_REG(DSI_PKT_LEN_2_3);
182         DUMP_REG(DSI_PKT_LEN_4_5);
183         DUMP_REG(DSI_PKT_LEN_6_7);
184 
185         DUMP_REG(DSI_PHY_TIMING_0);
186         DUMP_REG(DSI_PHY_TIMING_1);
187         DUMP_REG(DSI_PHY_TIMING_2);
188         DUMP_REG(DSI_BTA_TIMING);
189 
190         DUMP_REG(DSI_TIMEOUT_0);
191         DUMP_REG(DSI_TIMEOUT_1);
192         DUMP_REG(DSI_TO_TALLY);
193 
194         DUMP_REG(DSI_PAD_CONTROL_0);
195         DUMP_REG(DSI_PAD_CONTROL_CD);
196         DUMP_REG(DSI_PAD_CD_STATUS);
197         DUMP_REG(DSI_VIDEO_MODE_CONTROL);
198         DUMP_REG(DSI_PAD_CONTROL_1);
199         DUMP_REG(DSI_PAD_CONTROL_2);
200         DUMP_REG(DSI_PAD_CONTROL_3);
201         DUMP_REG(DSI_PAD_CONTROL_4);
202 
203         DUMP_REG(DSI_GANGED_MODE_CONTROL);
204         DUMP_REG(DSI_GANGED_MODE_START);
205         DUMP_REG(DSI_GANGED_MODE_SIZE);
206 
207         DUMP_REG(DSI_RAW_DATA_BYTE_COUNT);
208         DUMP_REG(DSI_ULTRA_LOW_POWER_CONTROL);
209 
210         DUMP_REG(DSI_INIT_SEQ_DATA_8);
211         DUMP_REG(DSI_INIT_SEQ_DATA_9);
212         DUMP_REG(DSI_INIT_SEQ_DATA_10);
213         DUMP_REG(DSI_INIT_SEQ_DATA_11);
214         DUMP_REG(DSI_INIT_SEQ_DATA_12);
215         DUMP_REG(DSI_INIT_SEQ_DATA_13);
216         DUMP_REG(DSI_INIT_SEQ_DATA_14);
217         DUMP_REG(DSI_INIT_SEQ_DATA_15);
218 
219 #undef DUMP_REG
220 
221 unlock:
222         drm_modeset_unlock_all(drm);
223         return err;
224 }
225 
226 static struct drm_info_list debugfs_files[] = {
227         { "regs", tegra_dsi_show_regs, 0, NULL },
228 };
229 
230 static int tegra_dsi_debugfs_init(struct tegra_dsi *dsi,
231                                   struct drm_minor *minor)
232 {
233         const char *name = dev_name(dsi->dev);
234         unsigned int i;
235         int err;
236 
237         dsi->debugfs = debugfs_create_dir(name, minor->debugfs_root);
238         if (!dsi->debugfs)
239                 return -ENOMEM;
240 
241         dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
242                                      GFP_KERNEL);
243         if (!dsi->debugfs_files) {
244                 err = -ENOMEM;
245                 goto remove;
246         }
247 
248         for (i = 0; i < ARRAY_SIZE(debugfs_files); i++)
249                 dsi->debugfs_files[i].data = dsi;
250 
251         err = drm_debugfs_create_files(dsi->debugfs_files,
252                                        ARRAY_SIZE(debugfs_files),
253                                        dsi->debugfs, minor);
254         if (err < 0)
255                 goto free;
256 
257         dsi->minor = minor;
258 
259         return 0;
260 
261 free:
262         kfree(dsi->debugfs_files);
263         dsi->debugfs_files = NULL;
264 remove:
265         debugfs_remove(dsi->debugfs);
266         dsi->debugfs = NULL;
267 
268         return err;
269 }
270 
271 static void tegra_dsi_debugfs_exit(struct tegra_dsi *dsi)
272 {
273         drm_debugfs_remove_files(dsi->debugfs_files, ARRAY_SIZE(debugfs_files),
274                                  dsi->minor);
275         dsi->minor = NULL;
276 
277         kfree(dsi->debugfs_files);
278         dsi->debugfs_files = NULL;
279 
280         debugfs_remove(dsi->debugfs);
281         dsi->debugfs = NULL;
282 }
283 
284 #define PKT_ID0(id)     ((((id) & 0x3f) <<  3) | (1 <<  9))
285 #define PKT_LEN0(len)   (((len) & 0x07) <<  0)
286 #define PKT_ID1(id)     ((((id) & 0x3f) << 13) | (1 << 19))
287 #define PKT_LEN1(len)   (((len) & 0x07) << 10)
288 #define PKT_ID2(id)     ((((id) & 0x3f) << 23) | (1 << 29))
289 #define PKT_LEN2(len)   (((len) & 0x07) << 20)
290 
291 #define PKT_LP          (1 << 30)
292 #define NUM_PKT_SEQ     12
293 
294 /*
295  * non-burst mode with sync pulses
296  */
297 static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = {
298         [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
299                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
300                PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
301                PKT_LP,
302         [ 1] = 0,
303         [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) |
304                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
305                PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
306                PKT_LP,
307         [ 3] = 0,
308         [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
309                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
310                PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
311                PKT_LP,
312         [ 5] = 0,
313         [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
314                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
315                PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
316         [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
317                PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
318                PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
319         [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
320                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
321                PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
322                PKT_LP,
323         [ 9] = 0,
324         [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
325                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
326                PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
327         [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
328                PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
329                PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
330 };
331 
332 /*
333  * non-burst mode with sync events
334  */
335 static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = {
336         [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
337                PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
338                PKT_LP,
339         [ 1] = 0,
340         [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
341                PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
342                PKT_LP,
343         [ 3] = 0,
344         [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
345                PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
346                PKT_LP,
347         [ 5] = 0,
348         [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
349                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
350                PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
351         [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
352         [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
353                PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) |
354                PKT_LP,
355         [ 9] = 0,
356         [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
357                PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) |
358                PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3),
359         [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4),
360 };
361 
362 static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = {
363         [ 0] = 0,
364         [ 1] = 0,
365         [ 2] = 0,
366         [ 3] = 0,
367         [ 4] = 0,
368         [ 5] = 0,
369         [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP,
370         [ 7] = 0,
371         [ 8] = 0,
372         [ 9] = 0,
373         [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP,
374         [11] = 0,
375 };
376 
377 static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi,
378                                      unsigned long period,
379                                      const struct mipi_dphy_timing *timing)
380 {
381         u32 value;
382 
383         value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 |
384                 DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 |
385                 DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 |
386                 DSI_TIMING_FIELD(timing->hsprepare, period, 1);
387         tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0);
388 
389         value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 |
390                 DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 |
391                 DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 |
392                 DSI_TIMING_FIELD(timing->lpx, period, 1);
393         tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1);
394 
395         value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 |
396                 DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 |
397                 DSI_TIMING_FIELD(0xff * period, period, 0) << 0;
398         tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2);
399 
400         value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 |
401                 DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 |
402                 DSI_TIMING_FIELD(timing->tago, period, 1);
403         tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);
404 
405         if (dsi->slave)
406                 tegra_dsi_set_phy_timing(dsi->slave, period, timing);
407 }
408 
409 static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,
410                                 unsigned int *mulp, unsigned int *divp)
411 {
412         switch (format) {
413         case MIPI_DSI_FMT_RGB666_PACKED:
414         case MIPI_DSI_FMT_RGB888:
415                 *mulp = 3;
416                 *divp = 1;
417                 break;
418 
419         case MIPI_DSI_FMT_RGB565:
420                 *mulp = 2;
421                 *divp = 1;
422                 break;
423 
424         case MIPI_DSI_FMT_RGB666:
425                 *mulp = 9;
426                 *divp = 4;
427                 break;
428 
429         default:
430                 return -EINVAL;
431         }
432 
433         return 0;
434 }
435 
436 static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format,
437                                 enum tegra_dsi_format *fmt)
438 {
439         switch (format) {
440         case MIPI_DSI_FMT_RGB888:
441                 *fmt = TEGRA_DSI_FORMAT_24P;
442                 break;
443 
444         case MIPI_DSI_FMT_RGB666:
445                 *fmt = TEGRA_DSI_FORMAT_18NP;
446                 break;
447 
448         case MIPI_DSI_FMT_RGB666_PACKED:
449                 *fmt = TEGRA_DSI_FORMAT_18P;
450                 break;
451 
452         case MIPI_DSI_FMT_RGB565:
453                 *fmt = TEGRA_DSI_FORMAT_16P;
454                 break;
455 
456         default:
457                 return -EINVAL;
458         }
459 
460         return 0;
461 }
462 
463 static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start,
464                                     unsigned int size)
465 {
466         u32 value;
467 
468         tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START);
469         tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE);
470 
471         value = DSI_GANGED_MODE_CONTROL_ENABLE;
472         tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL);
473 }
474 
475 static void tegra_dsi_enable(struct tegra_dsi *dsi)
476 {
477         u32 value;
478 
479         value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
480         value |= DSI_POWER_CONTROL_ENABLE;
481         tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
482 
483         if (dsi->slave)
484                 tegra_dsi_enable(dsi->slave);
485 }
486 
487 static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi)
488 {
489         if (dsi->master)
490                 return dsi->master->lanes + dsi->lanes;
491 
492         if (dsi->slave)
493                 return dsi->lanes + dsi->slave->lanes;
494 
495         return dsi->lanes;
496 }
497 
498 static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
499                                 const struct drm_display_mode *mode)
500 {
501         unsigned int hact, hsw, hbp, hfp, i, mul, div;
502         struct tegra_dsi_state *state;
503         const u32 *pkt_seq;
504         u32 value;
505 
506         /* XXX: pass in state into this function? */
507         if (dsi->master)
508                 state = tegra_dsi_get_state(dsi->master);
509         else
510                 state = tegra_dsi_get_state(dsi);
511 
512         mul = state->mul;
513         div = state->div;
514 
515         if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
516                 DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n");
517                 pkt_seq = pkt_seq_video_non_burst_sync_pulses;
518         } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
519                 DRM_DEBUG_KMS("Non-burst video mode with sync events\n");
520                 pkt_seq = pkt_seq_video_non_burst_sync_events;
521         } else {
522                 DRM_DEBUG_KMS("Command mode\n");
523                 pkt_seq = pkt_seq_command_mode;
524         }
525 
526         value = DSI_CONTROL_CHANNEL(0) |
527                 DSI_CONTROL_FORMAT(state->format) |
528                 DSI_CONTROL_LANES(dsi->lanes - 1) |
529                 DSI_CONTROL_SOURCE(pipe);
530         tegra_dsi_writel(dsi, value, DSI_CONTROL);
531 
532         tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD);
533 
534         value = DSI_HOST_CONTROL_HS;
535         tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
536 
537         value = tegra_dsi_readl(dsi, DSI_CONTROL);
538 
539         if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
540                 value |= DSI_CONTROL_HS_CLK_CTRL;
541 
542         value &= ~DSI_CONTROL_TX_TRIG(3);
543 
544         /* enable DCS commands for command mode */
545         if (dsi->flags & MIPI_DSI_MODE_VIDEO)
546                 value &= ~DSI_CONTROL_DCS_ENABLE;
547         else
548                 value |= DSI_CONTROL_DCS_ENABLE;
549 
550         value |= DSI_CONTROL_VIDEO_ENABLE;
551         value &= ~DSI_CONTROL_HOST_ENABLE;
552         tegra_dsi_writel(dsi, value, DSI_CONTROL);
553 
554         for (i = 0; i < NUM_PKT_SEQ; i++)
555                 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);
556 
557         if (dsi->flags & MIPI_DSI_MODE_VIDEO) {
558                 /* horizontal active pixels */
559                 hact = mode->hdisplay * mul / div;
560 
561                 /* horizontal sync width */
562                 hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
563 
564                 /* horizontal back porch */
565                 hbp = (mode->htotal - mode->hsync_end) * mul / div;
566 
567                 if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
568                         hbp += hsw;
569 
570                 /* horizontal front porch */
571                 hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
572 
573                 /* subtract packet overhead */
574                 hsw -= 10;
575                 hbp -= 14;
576                 hfp -= 8;
577 
578                 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);
579                 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3);
580                 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5);
581                 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7);
582 
583                 /* set SOL delay (for non-burst mode only) */
584                 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY);
585 
586                 /* TODO: implement ganged mode */
587         } else {
588                 u16 bytes;
589 
590                 if (dsi->master || dsi->slave) {
591                         /*
592                          * For ganged mode, assume symmetric left-right mode.
593                          */
594                         bytes = 1 + (mode->hdisplay / 2) * mul / div;
595                 } else {
596                         /* 1 byte (DCS command) + pixel data */
597                         bytes = 1 + mode->hdisplay * mul / div;
598                 }
599 
600                 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1);
601                 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3);
602                 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5);
603                 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7);
604 
605                 value = MIPI_DCS_WRITE_MEMORY_START << 8 |
606                         MIPI_DCS_WRITE_MEMORY_CONTINUE;
607                 tegra_dsi_writel(dsi, value, DSI_DCS_CMDS);
608 
609                 /* set SOL delay */
610                 if (dsi->master || dsi->slave) {
611                         unsigned long delay, bclk, bclk_ganged;
612                         unsigned int lanes = state->lanes;
613 
614                         /* SOL to valid, valid to FIFO and FIFO write delay */
615                         delay = 4 + 4 + 2;
616                         delay = DIV_ROUND_UP(delay * mul, div * lanes);
617                         /* FIFO read delay */
618                         delay = delay + 6;
619 
620                         bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes);
621                         bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes);
622                         value = bclk - bclk_ganged + delay + 20;
623                 } else {
624                         /* TODO: revisit for non-ganged mode */
625                         value = 8 * mul / div;
626                 }
627 
628                 tegra_dsi_writel(dsi, value, DSI_SOL_DELAY);
629         }
630 
631         if (dsi->slave) {
632                 tegra_dsi_configure(dsi->slave, pipe, mode);
633 
634                 /*
635                  * TODO: Support modes other than symmetrical left-right
636                  * split.
637                  */
638                 tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2);
639                 tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2,
640                                         mode->hdisplay / 2);
641         }
642 }
643 
644 static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout)
645 {
646         u32 value;
647 
648         timeout = jiffies + msecs_to_jiffies(timeout);
649 
650         while (time_before(jiffies, timeout)) {
651                 value = tegra_dsi_readl(dsi, DSI_STATUS);
652                 if (value & DSI_STATUS_IDLE)
653                         return 0;
654 
655                 usleep_range(1000, 2000);
656         }
657 
658         return -ETIMEDOUT;
659 }
660 
661 static void tegra_dsi_video_disable(struct tegra_dsi *dsi)
662 {
663         u32 value;
664 
665         value = tegra_dsi_readl(dsi, DSI_CONTROL);
666         value &= ~DSI_CONTROL_VIDEO_ENABLE;
667         tegra_dsi_writel(dsi, value, DSI_CONTROL);
668 
669         if (dsi->slave)
670                 tegra_dsi_video_disable(dsi->slave);
671 }
672 
673 static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi)
674 {
675         tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START);
676         tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE);
677         tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL);
678 }
679 
680 static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk,
681                                   unsigned int vrefresh)
682 {
683         unsigned int timeout;
684         u32 value;
685 
686         /* one frame high-speed transmission timeout */
687         timeout = (bclk / vrefresh) / 512;
688         value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout);
689         tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0);
690 
691         /* 2 ms peripheral timeout for panel */
692         timeout = 2 * bclk / 512 * 1000;
693         value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000);
694         tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1);
695 
696         value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0);
697         tegra_dsi_writel(dsi, value, DSI_TO_TALLY);
698 
699         if (dsi->slave)
700                 tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh);
701 }
702 
703 static void tegra_dsi_disable(struct tegra_dsi *dsi)
704 {
705         u32 value;
706 
707         if (dsi->slave) {
708                 tegra_dsi_ganged_disable(dsi->slave);
709                 tegra_dsi_ganged_disable(dsi);
710         }
711 
712         value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
713         value &= ~DSI_POWER_CONTROL_ENABLE;
714         tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
715 
716         if (dsi->slave)
717                 tegra_dsi_disable(dsi->slave);
718 
719         usleep_range(5000, 10000);
720 }
721 
722 static void tegra_dsi_soft_reset(struct tegra_dsi *dsi)
723 {
724         u32 value;
725 
726         value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
727         value &= ~DSI_POWER_CONTROL_ENABLE;
728         tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
729 
730         usleep_range(300, 1000);
731 
732         value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
733         value |= DSI_POWER_CONTROL_ENABLE;
734         tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
735 
736         usleep_range(300, 1000);
737 
738         value = tegra_dsi_readl(dsi, DSI_TRIGGER);
739         if (value)
740                 tegra_dsi_writel(dsi, 0, DSI_TRIGGER);
741 
742         if (dsi->slave)
743                 tegra_dsi_soft_reset(dsi->slave);
744 }
745 
746 static void tegra_dsi_connector_reset(struct drm_connector *connector)
747 {
748         struct tegra_dsi_state *state;
749 
750         kfree(connector->state);
751         connector->state = NULL;
752 
753         state = kzalloc(sizeof(*state), GFP_KERNEL);
754         if (state)
755                 connector->state = &state->base;
756 }
757 
758 static struct drm_connector_state *
759 tegra_dsi_connector_duplicate_state(struct drm_connector *connector)
760 {
761         struct tegra_dsi_state *state = to_dsi_state(connector->state);
762         struct tegra_dsi_state *copy;
763 
764         copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
765         if (!copy)
766                 return NULL;
767 
768         return &copy->base;
769 }
770 
771 static const struct drm_connector_funcs tegra_dsi_connector_funcs = {
772         .dpms = drm_atomic_helper_connector_dpms,
773         .reset = tegra_dsi_connector_reset,
774         .detect = tegra_output_connector_detect,
775         .fill_modes = drm_helper_probe_single_connector_modes,
776         .destroy = tegra_output_connector_destroy,
777         .atomic_duplicate_state = tegra_dsi_connector_duplicate_state,
778         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
779 };
780 
781 static enum drm_mode_status
782 tegra_dsi_connector_mode_valid(struct drm_connector *connector,
783                                struct drm_display_mode *mode)
784 {
785         return MODE_OK;
786 }
787 
788 static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = {
789         .get_modes = tegra_output_connector_get_modes,
790         .mode_valid = tegra_dsi_connector_mode_valid,
791         .best_encoder = tegra_output_connector_best_encoder,
792 };
793 
794 static const struct drm_encoder_funcs tegra_dsi_encoder_funcs = {
795         .destroy = tegra_output_encoder_destroy,
796 };
797 
798 static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
799 {
800         struct tegra_output *output = encoder_to_output(encoder);
801         struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
802         struct tegra_dsi *dsi = to_dsi(output);
803         u32 value;
804         int err;
805 
806         if (output->panel)
807                 drm_panel_disable(output->panel);
808 
809         tegra_dsi_video_disable(dsi);
810 
811         /*
812          * The following accesses registers of the display controller, so make
813          * sure it's only executed when the output is attached to one.
814          */
815         if (dc) {
816                 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
817                 value &= ~DSI_ENABLE;
818                 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
819 
820                 tegra_dc_commit(dc);
821         }
822 
823         err = tegra_dsi_wait_idle(dsi, 100);
824         if (err < 0)
825                 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err);
826 
827         tegra_dsi_soft_reset(dsi);
828 
829         if (output->panel)
830                 drm_panel_unprepare(output->panel);
831 
832         tegra_dsi_disable(dsi);
833 
834         return;
835 }
836 
837 static void tegra_dsi_encoder_enable(struct drm_encoder *encoder)
838 {
839         struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
840         struct tegra_output *output = encoder_to_output(encoder);
841         struct tegra_dc *dc = to_tegra_dc(encoder->crtc);
842         struct tegra_dsi *dsi = to_dsi(output);
843         struct tegra_dsi_state *state;
844         u32 value;
845 
846         state = tegra_dsi_get_state(dsi);
847 
848         tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh);
849 
850         /*
851          * The D-PHY timing fields are expressed in byte-clock cycles, so
852          * multiply the period by 8.
853          */
854         tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing);
855 
856         if (output->panel)
857                 drm_panel_prepare(output->panel);
858 
859         tegra_dsi_configure(dsi, dc->pipe, mode);
860 
861         /* enable display controller */
862         value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
863         value |= DSI_ENABLE;
864         tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
865 
866         tegra_dc_commit(dc);
867 
868         /* enable DSI controller */
869         tegra_dsi_enable(dsi);
870 
871         if (output->panel)
872                 drm_panel_enable(output->panel);
873 
874         return;
875 }
876 
877 static int
878 tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder,
879                                struct drm_crtc_state *crtc_state,
880                                struct drm_connector_state *conn_state)
881 {
882         struct tegra_output *output = encoder_to_output(encoder);
883         struct tegra_dsi_state *state = to_dsi_state(conn_state);
884         struct tegra_dc *dc = to_tegra_dc(conn_state->crtc);
885         struct tegra_dsi *dsi = to_dsi(output);
886         unsigned int scdiv;
887         unsigned long plld;
888         int err;
889 
890         state->pclk = crtc_state->mode.clock * 1000;
891 
892         err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div);
893         if (err < 0)
894                 return err;
895 
896         state->lanes = tegra_dsi_get_lanes(dsi);
897 
898         err = tegra_dsi_get_format(dsi->format, &state->format);
899         if (err < 0)
900                 return err;
901 
902         state->vrefresh = drm_mode_vrefresh(&crtc_state->mode);
903 
904         /* compute byte clock */
905         state->bclk = (state->pclk * state->mul) / (state->div * state->lanes);
906 
907         DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div,
908                       state->lanes);
909         DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format,
910                       state->vrefresh);
911         DRM_DEBUG_KMS("bclk: %lu\n", state->bclk);
912 
913         /*
914          * Compute bit clock and round up to the next MHz.
915          */
916         plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC;
917         state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld);
918 
919         err = mipi_dphy_timing_get_default(&state->timing, state->period);
920         if (err < 0)
921                 return err;
922 
923         err = mipi_dphy_timing_validate(&state->timing, state->period);
924         if (err < 0) {
925                 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
926                 return err;
927         }
928 
929         /*
930          * We divide the frequency by two here, but we make up for that by
931          * setting the shift clock divider (further below) to half of the
932          * correct value.
933          */
934         plld /= 2;
935 
936         /*
937          * Derive pixel clock from bit clock using the shift clock divider.
938          * Note that this is only half of what we would expect, but we need
939          * that to make up for the fact that we divided the bit clock by a
940          * factor of two above.
941          *
942          * It's not clear exactly why this is necessary, but the display is
943          * not working properly otherwise. Perhaps the PLLs cannot generate
944          * frequencies sufficiently high.
945          */
946         scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2;
947 
948         err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent,
949                                          plld, scdiv);
950         if (err < 0) {
951                 dev_err(output->dev, "failed to setup CRTC state: %d\n", err);
952                 return err;
953         }
954 
955         return err;
956 }
957 
958 static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = {
959         .disable = tegra_dsi_encoder_disable,
960         .enable = tegra_dsi_encoder_enable,
961         .atomic_check = tegra_dsi_encoder_atomic_check,
962 };
963 
964 static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
965 {
966         u32 value;
967 
968         value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
969         tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);
970 
971         return 0;
972 }
973 
974 static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
975 {
976         u32 value;
977 
978         tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
979         tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
980         tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
981         tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
982         tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);
983 
984         /* start calibration */
985         tegra_dsi_pad_enable(dsi);
986 
987         value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
988                 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
989                 DSI_PAD_OUT_CLK(0x0);
990         tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);
991 
992         value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) |
993                 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3);
994         tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3);
995 
996         return tegra_mipi_calibrate(dsi->mipi);
997 }
998 
999 static int tegra_dsi_init(struct host1x_client *client)
1000 {
1001         struct drm_device *drm = dev_get_drvdata(client->parent);
1002         struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1003         int err;
1004 
1005         reset_control_deassert(dsi->rst);
1006 
1007         err = tegra_dsi_pad_calibrate(dsi);
1008         if (err < 0) {
1009                 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
1010                 goto reset;
1011         }
1012 
1013         /* Gangsters must not register their own outputs. */
1014         if (!dsi->master) {
1015                 dsi->output.dev = client->dev;
1016 
1017                 drm_connector_init(drm, &dsi->output.connector,
1018                                    &tegra_dsi_connector_funcs,
1019                                    DRM_MODE_CONNECTOR_DSI);
1020                 drm_connector_helper_add(&dsi->output.connector,
1021                                          &tegra_dsi_connector_helper_funcs);
1022                 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF;
1023 
1024                 drm_encoder_init(drm, &dsi->output.encoder,
1025                                  &tegra_dsi_encoder_funcs,
1026                                  DRM_MODE_ENCODER_DSI);
1027                 drm_encoder_helper_add(&dsi->output.encoder,
1028                                        &tegra_dsi_encoder_helper_funcs);
1029 
1030                 drm_mode_connector_attach_encoder(&dsi->output.connector,
1031                                                   &dsi->output.encoder);
1032                 drm_connector_register(&dsi->output.connector);
1033 
1034                 err = tegra_output_init(drm, &dsi->output);
1035                 if (err < 0) {
1036                         dev_err(client->dev,
1037                                 "failed to initialize output: %d\n",
1038                                 err);
1039                         goto reset;
1040                 }
1041 
1042                 dsi->output.encoder.possible_crtcs = 0x3;
1043         }
1044 
1045         if (IS_ENABLED(CONFIG_DEBUG_FS)) {
1046                 err = tegra_dsi_debugfs_init(dsi, drm->primary);
1047                 if (err < 0)
1048                         dev_err(dsi->dev, "debugfs setup failed: %d\n", err);
1049         }
1050 
1051         return 0;
1052 
1053 reset:
1054         reset_control_assert(dsi->rst);
1055         return err;
1056 }
1057 
1058 static int tegra_dsi_exit(struct host1x_client *client)
1059 {
1060         struct tegra_dsi *dsi = host1x_client_to_dsi(client);
1061 
1062         tegra_output_exit(&dsi->output);
1063 
1064         if (IS_ENABLED(CONFIG_DEBUG_FS))
1065                 tegra_dsi_debugfs_exit(dsi);
1066 
1067         reset_control_assert(dsi->rst);
1068 
1069         return 0;
1070 }
1071 
1072 static const struct host1x_client_ops dsi_client_ops = {
1073         .init = tegra_dsi_init,
1074         .exit = tegra_dsi_exit,
1075 };
1076 
1077 static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
1078 {
1079         struct clk *parent;
1080         int err;
1081 
1082         parent = clk_get_parent(dsi->clk);
1083         if (!parent)
1084                 return -EINVAL;
1085 
1086         err = clk_set_parent(parent, dsi->clk_parent);
1087         if (err < 0)
1088                 return err;
1089 
1090         return 0;
1091 }
1092 
1093 static const char * const error_report[16] = {
1094         "SoT Error",
1095         "SoT Sync Error",
1096         "EoT Sync Error",
1097         "Escape Mode Entry Command Error",
1098         "Low-Power Transmit Sync Error",
1099         "Peripheral Timeout Error",
1100         "False Control Error",
1101         "Contention Detected",
1102         "ECC Error, single-bit",
1103         "ECC Error, multi-bit",
1104         "Checksum Error",
1105         "DSI Data Type Not Recognized",
1106         "DSI VC ID Invalid",
1107         "Invalid Transmission Length",
1108         "Reserved",
1109         "DSI Protocol Violation",
1110 };
1111 
1112 static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi,
1113                                        const struct mipi_dsi_msg *msg,
1114                                        size_t count)
1115 {
1116         u8 *rx = msg->rx_buf;
1117         unsigned int i, j, k;
1118         size_t size = 0;
1119         u16 errors;
1120         u32 value;
1121 
1122         /* read and parse packet header */
1123         value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1124 
1125         switch (value & 0x3f) {
1126         case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1127                 errors = (value >> 8) & 0xffff;
1128                 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n",
1129                         errors);
1130                 for (i = 0; i < ARRAY_SIZE(error_report); i++)
1131                         if (errors & BIT(i))
1132                                 dev_dbg(dsi->dev, "  %2u: %s\n", i,
1133                                         error_report[i]);
1134                 break;
1135 
1136         case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1137                 rx[0] = (value >> 8) & 0xff;
1138                 size = 1;
1139                 break;
1140 
1141         case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1142                 rx[0] = (value >>  8) & 0xff;
1143                 rx[1] = (value >> 16) & 0xff;
1144                 size = 2;
1145                 break;
1146 
1147         case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
1148                 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1149                 break;
1150 
1151         case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
1152                 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff);
1153                 break;
1154 
1155         default:
1156                 dev_err(dsi->dev, "unhandled response type: %02x\n",
1157                         value & 0x3f);
1158                 return -EPROTO;
1159         }
1160 
1161         size = min(size, msg->rx_len);
1162 
1163         if (msg->rx_buf && size > 0) {
1164                 for (i = 0, j = 0; i < count - 1; i++, j += 4) {
1165                         u8 *rx = msg->rx_buf + j;
1166 
1167                         value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1168 
1169                         for (k = 0; k < 4 && (j + k) < msg->rx_len; k++)
1170                                 rx[j + k] = (value >> (k << 3)) & 0xff;
1171                 }
1172         }
1173 
1174         return size;
1175 }
1176 
1177 static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout)
1178 {
1179         tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER);
1180 
1181         timeout = jiffies + msecs_to_jiffies(timeout);
1182 
1183         while (time_before(jiffies, timeout)) {
1184                 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER);
1185                 if ((value & DSI_TRIGGER_HOST) == 0)
1186                         return 0;
1187 
1188                 usleep_range(1000, 2000);
1189         }
1190 
1191         DRM_DEBUG_KMS("timeout waiting for transmission to complete\n");
1192         return -ETIMEDOUT;
1193 }
1194 
1195 static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi,
1196                                        unsigned long timeout)
1197 {
1198         timeout = jiffies + msecs_to_jiffies(250);
1199 
1200         while (time_before(jiffies, timeout)) {
1201                 u32 value = tegra_dsi_readl(dsi, DSI_STATUS);
1202                 u8 count = value & 0x1f;
1203 
1204                 if (count > 0)
1205                         return count;
1206 
1207                 usleep_range(1000, 2000);
1208         }
1209 
1210         DRM_DEBUG_KMS("peripheral returned no data\n");
1211         return -ETIMEDOUT;
1212 }
1213 
1214 static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset,
1215                               const void *buffer, size_t size)
1216 {
1217         const u8 *buf = buffer;
1218         size_t i, j;
1219         u32 value;
1220 
1221         for (j = 0; j < size; j += 4) {
1222                 value = 0;
1223 
1224                 for (i = 0; i < 4 && j + i < size; i++)
1225                         value |= buf[j + i] << (i << 3);
1226 
1227                 tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1228         }
1229 }
1230 
1231 static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host,
1232                                        const struct mipi_dsi_msg *msg)
1233 {
1234         struct tegra_dsi *dsi = host_to_tegra(host);
1235         struct mipi_dsi_packet packet;
1236         const u8 *header;
1237         size_t count;
1238         ssize_t err;
1239         u32 value;
1240 
1241         err = mipi_dsi_create_packet(&packet, msg);
1242         if (err < 0)
1243                 return err;
1244 
1245         header = packet.header;
1246 
1247         /* maximum FIFO depth is 1920 words */
1248         if (packet.size > dsi->video_fifo_depth * 4)
1249                 return -ENOSPC;
1250 
1251         /* reset underflow/overflow flags */
1252         value = tegra_dsi_readl(dsi, DSI_STATUS);
1253         if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) {
1254                 value = DSI_HOST_CONTROL_FIFO_RESET;
1255                 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1256                 usleep_range(10, 20);
1257         }
1258 
1259         value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
1260         value |= DSI_POWER_CONTROL_ENABLE;
1261         tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);
1262 
1263         usleep_range(5000, 10000);
1264 
1265         value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST |
1266                 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC;
1267 
1268         if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0)
1269                 value |= DSI_HOST_CONTROL_HS;
1270 
1271         /*
1272          * The host FIFO has a maximum of 64 words, so larger transmissions
1273          * need to use the video FIFO.
1274          */
1275         if (packet.size > dsi->host_fifo_depth * 4)
1276                 value |= DSI_HOST_CONTROL_FIFO_SEL;
1277 
1278         tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1279 
1280         /*
1281          * For reads and messages with explicitly requested ACK, generate a
1282          * BTA sequence after the transmission of the packet.
1283          */
1284         if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1285             (msg->rx_buf && msg->rx_len > 0)) {
1286                 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
1287                 value |= DSI_HOST_CONTROL_PKT_BTA;
1288                 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);
1289         }
1290 
1291         value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE;
1292         tegra_dsi_writel(dsi, value, DSI_CONTROL);
1293 
1294         /* write packet header, ECC is generated by hardware */
1295         value = header[2] << 16 | header[1] << 8 | header[0];
1296         tegra_dsi_writel(dsi, value, DSI_WR_DATA);
1297 
1298         /* write payload (if any) */
1299         if (packet.payload_length > 0)
1300                 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload,
1301                                   packet.payload_length);
1302 
1303         err = tegra_dsi_transmit(dsi, 250);
1304         if (err < 0)
1305                 return err;
1306 
1307         if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) ||
1308             (msg->rx_buf && msg->rx_len > 0)) {
1309                 err = tegra_dsi_wait_for_response(dsi, 250);
1310                 if (err < 0)
1311                         return err;
1312 
1313                 count = err;
1314 
1315                 value = tegra_dsi_readl(dsi, DSI_RD_DATA);
1316                 switch (value) {
1317                 case 0x84:
1318                         /*
1319                         dev_dbg(dsi->dev, "ACK\n");
1320                         */
1321                         break;
1322 
1323                 case 0x87:
1324                         /*
1325                         dev_dbg(dsi->dev, "ESCAPE\n");
1326                         */
1327                         break;
1328 
1329                 default:
1330                         dev_err(dsi->dev, "unknown status: %08x\n", value);
1331                         break;
1332                 }
1333 
1334                 if (count > 1) {
1335                         err = tegra_dsi_read_response(dsi, msg, count);
1336                         if (err < 0)
1337                                 dev_err(dsi->dev,
1338                                         "failed to parse response: %zd\n",
1339                                         err);
1340                         else {
1341                                 /*
1342                                  * For read commands, return the number of
1343                                  * bytes returned by the peripheral.
1344                                  */
1345                                 count = err;
1346                         }
1347                 }
1348         } else {
1349                 /*
1350                  * For write commands, we have transmitted the 4-byte header
1351                  * plus the variable-length payload.
1352                  */
1353                 count = 4 + packet.payload_length;
1354         }
1355 
1356         return count;
1357 }
1358 
1359 static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi)
1360 {
1361         struct clk *parent;
1362         int err;
1363 
1364         /* make sure both DSI controllers share the same PLL */
1365         parent = clk_get_parent(dsi->slave->clk);
1366         if (!parent)
1367                 return -EINVAL;
1368 
1369         err = clk_set_parent(parent, dsi->clk_parent);
1370         if (err < 0)
1371                 return err;
1372 
1373         return 0;
1374 }
1375 
1376 static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
1377                                  struct mipi_dsi_device *device)
1378 {
1379         struct tegra_dsi *dsi = host_to_tegra(host);
1380 
1381         dsi->flags = device->mode_flags;
1382         dsi->format = device->format;
1383         dsi->lanes = device->lanes;
1384 
1385         if (dsi->slave) {
1386                 int err;
1387 
1388                 dev_dbg(dsi->dev, "attaching dual-channel device %s\n",
1389                         dev_name(&device->dev));
1390 
1391                 err = tegra_dsi_ganged_setup(dsi);
1392                 if (err < 0) {
1393                         dev_err(dsi->dev, "failed to set up ganged mode: %d\n",
1394                                 err);
1395                         return err;
1396                 }
1397         }
1398 
1399         /*
1400          * Slaves don't have a panel associated with them, so they provide
1401          * merely the second channel.
1402          */
1403         if (!dsi->master) {
1404                 struct tegra_output *output = &dsi->output;
1405 
1406                 output->panel = of_drm_find_panel(device->dev.of_node);
1407                 if (output->panel && output->connector.dev) {
1408                         drm_panel_attach(output->panel, &output->connector);
1409                         drm_helper_hpd_irq_event(output->connector.dev);
1410                 }
1411         }
1412 
1413         return 0;
1414 }
1415 
1416 static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
1417                                  struct mipi_dsi_device *device)
1418 {
1419         struct tegra_dsi *dsi = host_to_tegra(host);
1420         struct tegra_output *output = &dsi->output;
1421 
1422         if (output->panel && &device->dev == output->panel->dev) {
1423                 output->panel = NULL;
1424 
1425                 if (output->connector.dev)
1426                         drm_helper_hpd_irq_event(output->connector.dev);
1427         }
1428 
1429         return 0;
1430 }
1431 
1432 static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
1433         .attach = tegra_dsi_host_attach,
1434         .detach = tegra_dsi_host_detach,
1435         .transfer = tegra_dsi_host_transfer,
1436 };
1437 
1438 static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
1439 {
1440         struct device_node *np;
1441 
1442         np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0);
1443         if (np) {
1444                 struct platform_device *gangster = of_find_device_by_node(np);
1445 
1446                 dsi->slave = platform_get_drvdata(gangster);
1447                 of_node_put(np);
1448 
1449                 if (!dsi->slave)
1450                         return -EPROBE_DEFER;
1451 
1452                 dsi->slave->master = dsi;
1453         }
1454 
1455         return 0;
1456 }
1457 
1458 static int tegra_dsi_probe(struct platform_device *pdev)
1459 {
1460         struct tegra_dsi *dsi;
1461         struct resource *regs;
1462         int err;
1463 
1464         dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
1465         if (!dsi)
1466                 return -ENOMEM;
1467 
1468         dsi->output.dev = dsi->dev = &pdev->dev;
1469         dsi->video_fifo_depth = 1920;
1470         dsi->host_fifo_depth = 64;
1471 
1472         err = tegra_dsi_ganged_probe(dsi);
1473         if (err < 0)
1474                 return err;
1475 
1476         err = tegra_output_probe(&dsi->output);
1477         if (err < 0)
1478                 return err;
1479 
1480         dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD;
1481 
1482         /*
1483          * Assume these values by default. When a DSI peripheral driver
1484          * attaches to the DSI host, the parameters will be taken from
1485          * the attached device.
1486          */
1487         dsi->flags = MIPI_DSI_MODE_VIDEO;
1488         dsi->format = MIPI_DSI_FMT_RGB888;
1489         dsi->lanes = 4;
1490 
1491         dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
1492         if (IS_ERR(dsi->rst))
1493                 return PTR_ERR(dsi->rst);
1494 
1495         dsi->clk = devm_clk_get(&pdev->dev, NULL);
1496         if (IS_ERR(dsi->clk)) {
1497                 dev_err(&pdev->dev, "cannot get DSI clock\n");
1498                 err = PTR_ERR(dsi->clk);
1499                 goto reset;
1500         }
1501 
1502         err = clk_prepare_enable(dsi->clk);
1503         if (err < 0) {
1504                 dev_err(&pdev->dev, "cannot enable DSI clock\n");
1505                 goto reset;
1506         }
1507 
1508         dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
1509         if (IS_ERR(dsi->clk_lp)) {
1510                 dev_err(&pdev->dev, "cannot get low-power clock\n");
1511                 err = PTR_ERR(dsi->clk_lp);
1512                 goto disable_clk;
1513         }
1514 
1515         err = clk_prepare_enable(dsi->clk_lp);
1516         if (err < 0) {
1517                 dev_err(&pdev->dev, "cannot enable low-power clock\n");
1518                 goto disable_clk;
1519         }
1520 
1521         dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
1522         if (IS_ERR(dsi->clk_parent)) {
1523                 dev_err(&pdev->dev, "cannot get parent clock\n");
1524                 err = PTR_ERR(dsi->clk_parent);
1525                 goto disable_clk_lp;
1526         }
1527 
1528         dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");
1529         if (IS_ERR(dsi->vdd)) {
1530                 dev_err(&pdev->dev, "cannot get VDD supply\n");
1531                 err = PTR_ERR(dsi->vdd);
1532                 goto disable_clk_lp;
1533         }
1534 
1535         err = regulator_enable(dsi->vdd);
1536         if (err < 0) {
1537                 dev_err(&pdev->dev, "cannot enable VDD supply\n");
1538                 goto disable_clk_lp;
1539         }
1540 
1541         err = tegra_dsi_setup_clocks(dsi);
1542         if (err < 0) {
1543                 dev_err(&pdev->dev, "cannot setup clocks\n");
1544                 goto disable_vdd;
1545         }
1546 
1547         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1548         dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
1549         if (IS_ERR(dsi->regs)) {
1550                 err = PTR_ERR(dsi->regs);
1551                 goto disable_vdd;
1552         }
1553 
1554         dsi->mipi = tegra_mipi_request(&pdev->dev);
1555         if (IS_ERR(dsi->mipi)) {
1556                 err = PTR_ERR(dsi->mipi);
1557                 goto disable_vdd;
1558         }
1559 
1560         dsi->host.ops = &tegra_dsi_host_ops;
1561         dsi->host.dev = &pdev->dev;
1562 
1563         err = mipi_dsi_host_register(&dsi->host);
1564         if (err < 0) {
1565                 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
1566                 goto mipi_free;
1567         }
1568 
1569         INIT_LIST_HEAD(&dsi->client.list);
1570         dsi->client.ops = &dsi_client_ops;
1571         dsi->client.dev = &pdev->dev;
1572 
1573         err = host1x_client_register(&dsi->client);
1574         if (err < 0) {
1575                 dev_err(&pdev->dev, "failed to register host1x client: %d\n",
1576                         err);
1577                 goto unregister;
1578         }
1579 
1580         platform_set_drvdata(pdev, dsi);
1581 
1582         return 0;
1583 
1584 unregister:
1585         mipi_dsi_host_unregister(&dsi->host);
1586 mipi_free:
1587         tegra_mipi_free(dsi->mipi);
1588 disable_vdd:
1589         regulator_disable(dsi->vdd);
1590 disable_clk_lp:
1591         clk_disable_unprepare(dsi->clk_lp);
1592 disable_clk:
1593         clk_disable_unprepare(dsi->clk);
1594 reset:
1595         reset_control_assert(dsi->rst);
1596         return err;
1597 }
1598 
1599 static int tegra_dsi_remove(struct platform_device *pdev)
1600 {
1601         struct tegra_dsi *dsi = platform_get_drvdata(pdev);
1602         int err;
1603 
1604         err = host1x_client_unregister(&dsi->client);
1605         if (err < 0) {
1606                 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
1607                         err);
1608                 return err;
1609         }
1610 
1611         tegra_output_remove(&dsi->output);
1612 
1613         mipi_dsi_host_unregister(&dsi->host);
1614         tegra_mipi_free(dsi->mipi);
1615 
1616         regulator_disable(dsi->vdd);
1617         clk_disable_unprepare(dsi->clk_lp);
1618         clk_disable_unprepare(dsi->clk);
1619         reset_control_assert(dsi->rst);
1620 
1621         return 0;
1622 }
1623 
1624 static const struct of_device_id tegra_dsi_of_match[] = {
1625         { .compatible = "nvidia,tegra210-dsi", },
1626         { .compatible = "nvidia,tegra132-dsi", },
1627         { .compatible = "nvidia,tegra124-dsi", },
1628         { .compatible = "nvidia,tegra114-dsi", },
1629         { },
1630 };
1631 MODULE_DEVICE_TABLE(of, tegra_dsi_of_match);
1632 
1633 struct platform_driver tegra_dsi_driver = {
1634         .driver = {
1635                 .name = "tegra-dsi",
1636                 .of_match_table = tegra_dsi_of_match,
1637         },
1638         .probe = tegra_dsi_probe,
1639         .remove = tegra_dsi_remove,
1640 };
1641 

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