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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020 Texas Instruments Incorporated - https://www.ti.com
4 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
5 */
6
7#include <linux/clk.h>
8#include <linux/device.h>
9#include <linux/gpio/consumer.h>
10#include <linux/i2c.h>
11#include <linux/kernel.h>
12#include <linux/math64.h>
13#include <linux/media-bus-format.h>
14#include <linux/minmax.h>
15#include <linux/module.h>
16#include <linux/regmap.h>
17#include <linux/regulator/consumer.h>
18#include <linux/slab.h>
19#include <linux/units.h>
20
21#include <drm/drm_atomic_helper.h>
22#include <drm/drm_drv.h>
23#include <drm/drm_mipi_dsi.h>
24#include <drm/drm_of.h>
25#include <drm/drm_panel.h>
26#include <video/mipi_display.h>
27#include <video/videomode.h>
28
29/* Global (16-bit addressable) */
30#define TC358768_CHIPID 0x0000
31#define TC358768_SYSCTL 0x0002
32#define TC358768_CONFCTL 0x0004
33#define TC358768_VSDLY 0x0006
34#define TC358768_DATAFMT 0x0008
35#define TC358768_GPIOEN 0x000E
36#define TC358768_GPIODIR 0x0010
37#define TC358768_GPIOIN 0x0012
38#define TC358768_GPIOOUT 0x0014
39#define TC358768_PLLCTL0 0x0016
40#define TC358768_PLLCTL1 0x0018
41#define TC358768_CMDBYTE 0x0022
42#define TC358768_PP_MISC 0x0032
43#define TC358768_DSITX_DT 0x0050
44#define TC358768_FIFOSTATUS 0x00F8
45
46/* Debug (16-bit addressable) */
47#define TC358768_VBUFCTRL 0x00E0
48#define TC358768_DBG_WIDTH 0x00E2
49#define TC358768_DBG_VBLANK 0x00E4
50#define TC358768_DBG_DATA 0x00E8
51
52/* TX PHY (32-bit addressable) */
53#define TC358768_CLW_DPHYCONTTX 0x0100
54#define TC358768_D0W_DPHYCONTTX 0x0104
55#define TC358768_D1W_DPHYCONTTX 0x0108
56#define TC358768_D2W_DPHYCONTTX 0x010C
57#define TC358768_D3W_DPHYCONTTX 0x0110
58#define TC358768_CLW_CNTRL 0x0140
59#define TC358768_D0W_CNTRL 0x0144
60#define TC358768_D1W_CNTRL 0x0148
61#define TC358768_D2W_CNTRL 0x014C
62#define TC358768_D3W_CNTRL 0x0150
63
64/* TX PPI (32-bit addressable) */
65#define TC358768_STARTCNTRL 0x0204
66#define TC358768_DSITXSTATUS 0x0208
67#define TC358768_LINEINITCNT 0x0210
68#define TC358768_LPTXTIMECNT 0x0214
69#define TC358768_TCLK_HEADERCNT 0x0218
70#define TC358768_TCLK_TRAILCNT 0x021C
71#define TC358768_THS_HEADERCNT 0x0220
72#define TC358768_TWAKEUP 0x0224
73#define TC358768_TCLK_POSTCNT 0x0228
74#define TC358768_THS_TRAILCNT 0x022C
75#define TC358768_HSTXVREGCNT 0x0230
76#define TC358768_HSTXVREGEN 0x0234
77#define TC358768_TXOPTIONCNTRL 0x0238
78#define TC358768_BTACNTRL1 0x023C
79
80/* TX CTRL (32-bit addressable) */
81#define TC358768_DSI_CONTROL 0x040C
82#define TC358768_DSI_STATUS 0x0410
83#define TC358768_DSI_INT 0x0414
84#define TC358768_DSI_INT_ENA 0x0418
85#define TC358768_DSICMD_RDFIFO 0x0430
86#define TC358768_DSI_ACKERR 0x0434
87#define TC358768_DSI_ACKERR_INTENA 0x0438
88#define TC358768_DSI_ACKERR_HALT 0x043c
89#define TC358768_DSI_RXERR 0x0440
90#define TC358768_DSI_RXERR_INTENA 0x0444
91#define TC358768_DSI_RXERR_HALT 0x0448
92#define TC358768_DSI_ERR 0x044C
93#define TC358768_DSI_ERR_INTENA 0x0450
94#define TC358768_DSI_ERR_HALT 0x0454
95#define TC358768_DSI_CONFW 0x0500
96#define TC358768_DSI_LPCMD 0x0500
97#define TC358768_DSI_RESET 0x0504
98#define TC358768_DSI_INT_CLR 0x050C
99#define TC358768_DSI_START 0x0518
100
101/* DSITX CTRL (16-bit addressable) */
102#define TC358768_DSICMD_TX 0x0600
103#define TC358768_DSICMD_TYPE 0x0602
104#define TC358768_DSICMD_WC 0x0604
105#define TC358768_DSICMD_WD0 0x0610
106#define TC358768_DSICMD_WD1 0x0612
107#define TC358768_DSICMD_WD2 0x0614
108#define TC358768_DSICMD_WD3 0x0616
109#define TC358768_DSI_EVENT 0x0620
110#define TC358768_DSI_VSW 0x0622
111#define TC358768_DSI_VBPR 0x0624
112#define TC358768_DSI_VACT 0x0626
113#define TC358768_DSI_HSW 0x0628
114#define TC358768_DSI_HBPR 0x062A
115#define TC358768_DSI_HACT 0x062C
116
117/* TC358768_DSI_CONTROL (0x040C) register */
118#define TC358768_DSI_CONTROL_DIS_MODE BIT(15)
119#define TC358768_DSI_CONTROL_TXMD BIT(7)
120#define TC358768_DSI_CONTROL_HSCKMD BIT(5)
121#define TC358768_DSI_CONTROL_EOTDIS BIT(0)
122
123/* TC358768_DSI_CONFW (0x0500) register */
124#define TC358768_DSI_CONFW_MODE_SET (5 << 29)
125#define TC358768_DSI_CONFW_MODE_CLR (6 << 29)
126#define TC358768_DSI_CONFW_ADDR_DSI_CONTROL (0x3 << 24)
127
128static const char * const tc358768_supplies[] = {
129 "vddc", "vddmipi", "vddio"
130};
131
132struct tc358768_dsi_output {
133 struct mipi_dsi_device *dev;
134 struct drm_panel *panel;
135 struct drm_bridge *bridge;
136};
137
138struct tc358768_priv {
139 struct device *dev;
140 struct regmap *regmap;
141 struct gpio_desc *reset_gpio;
142 struct regulator_bulk_data supplies[ARRAY_SIZE(tc358768_supplies)];
143 struct clk *refclk;
144 int enabled;
145 int error;
146
147 struct mipi_dsi_host dsi_host;
148 struct drm_bridge bridge;
149 struct tc358768_dsi_output output;
150
151 u32 pd_lines; /* number of Parallel Port Input Data Lines */
152 u32 dsi_lanes; /* number of DSI Lanes */
153 u32 dsi_bpp; /* number of Bits Per Pixel over DSI */
154
155 /* Parameters for PLL programming */
156 u32 fbd; /* PLL feedback divider */
157 u32 prd; /* PLL input divider */
158 u32 frs; /* PLL Freqency range for HSCK (post divider) */
159
160 u32 dsiclk; /* pll_clk / 2 */
161 u32 pclk; /* incoming pclk rate */
162};
163
164static inline struct tc358768_priv *dsi_host_to_tc358768(struct mipi_dsi_host
165 *host)
166{
167 return container_of(host, struct tc358768_priv, dsi_host);
168}
169
170static inline struct tc358768_priv *bridge_to_tc358768(struct drm_bridge
171 *bridge)
172{
173 return container_of(bridge, struct tc358768_priv, bridge);
174}
175
176static int tc358768_clear_error(struct tc358768_priv *priv)
177{
178 int ret = priv->error;
179
180 priv->error = 0;
181 return ret;
182}
183
184static void tc358768_write(struct tc358768_priv *priv, u32 reg, u32 val)
185{
186 /* work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
187 int tmpval = val;
188 size_t count = 2;
189
190 if (priv->error)
191 return;
192
193 /* 16-bit register? */
194 if (reg < 0x100 || reg >= 0x600)
195 count = 1;
196
197 priv->error = regmap_bulk_write(priv->regmap, reg, &tmpval, count);
198}
199
200static void tc358768_read(struct tc358768_priv *priv, u32 reg, u32 *val)
201{
202 size_t count = 2;
203
204 if (priv->error)
205 return;
206
207 /* 16-bit register? */
208 if (reg < 0x100 || reg >= 0x600) {
209 *val = 0;
210 count = 1;
211 }
212
213 priv->error = regmap_bulk_read(priv->regmap, reg, val, count);
214}
215
216static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask,
217 u32 val)
218{
219 u32 tmp, orig;
220
221 tc358768_read(priv, reg, &orig);
222
223 if (priv->error)
224 return;
225
226 tmp = orig & ~mask;
227 tmp |= val & mask;
228 if (tmp != orig)
229 tc358768_write(priv, reg, tmp);
230}
231
232static int tc358768_sw_reset(struct tc358768_priv *priv)
233{
234 /* Assert Reset */
235 tc358768_write(priv, TC358768_SYSCTL, 1);
236 /* Release Reset, Exit Sleep */
237 tc358768_write(priv, TC358768_SYSCTL, 0);
238
239 return tc358768_clear_error(priv);
240}
241
242static void tc358768_hw_enable(struct tc358768_priv *priv)
243{
244 int ret;
245
246 if (priv->enabled)
247 return;
248
249 ret = clk_prepare_enable(priv->refclk);
250 if (ret < 0)
251 dev_err(priv->dev, "error enabling refclk (%d)\n", ret);
252
253 ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
254 if (ret < 0)
255 dev_err(priv->dev, "error enabling regulators (%d)\n", ret);
256
257 if (priv->reset_gpio)
258 usleep_range(200, 300);
259
260 /*
261 * The RESX is active low (GPIO_ACTIVE_LOW).
262 * DEASSERT (value = 0) the reset_gpio to enable the chip
263 */
264 gpiod_set_value_cansleep(priv->reset_gpio, 0);
265
266 /* wait for encoder clocks to stabilize */
267 usleep_range(1000, 2000);
268
269 priv->enabled = true;
270}
271
272static void tc358768_hw_disable(struct tc358768_priv *priv)
273{
274 int ret;
275
276 if (!priv->enabled)
277 return;
278
279 /*
280 * The RESX is active low (GPIO_ACTIVE_LOW).
281 * ASSERT (value = 1) the reset_gpio to disable the chip
282 */
283 gpiod_set_value_cansleep(priv->reset_gpio, 1);
284
285 ret = regulator_bulk_disable(ARRAY_SIZE(priv->supplies),
286 priv->supplies);
287 if (ret < 0)
288 dev_err(priv->dev, "error disabling regulators (%d)\n", ret);
289
290 clk_disable_unprepare(priv->refclk);
291
292 priv->enabled = false;
293}
294
295static u32 tc358768_pll_to_pclk(struct tc358768_priv *priv, u32 pll_clk)
296{
297 return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->dsi_bpp);
298}
299
300static u32 tc358768_pclk_to_pll(struct tc358768_priv *priv, u32 pclk)
301{
302 return (u32)div_u64((u64)pclk * priv->dsi_bpp, priv->dsi_lanes);
303}
304
305static int tc358768_calc_pll(struct tc358768_priv *priv,
306 const struct drm_display_mode *mode,
307 bool verify_only)
308{
309 static const u32 frs_limits[] = {
310 1000000000,
311 500000000,
312 250000000,
313 125000000,
314 62500000
315 };
316 unsigned long refclk;
317 u32 prd, target_pll, i, max_pll, min_pll;
318 u32 frs, best_diff, best_pll, best_prd, best_fbd;
319
320 target_pll = tc358768_pclk_to_pll(priv, mode->clock * 1000);
321
322 /* pll_clk = RefClk * FBD / PRD * (1 / (2^FRS)) */
323
324 for (i = 0; i < ARRAY_SIZE(frs_limits); i++)
325 if (target_pll >= frs_limits[i])
326 break;
327
328 if (i == ARRAY_SIZE(frs_limits) || i == 0)
329 return -EINVAL;
330
331 frs = i - 1;
332 max_pll = frs_limits[i - 1];
333 min_pll = frs_limits[i];
334
335 refclk = clk_get_rate(priv->refclk);
336
337 best_diff = UINT_MAX;
338 best_pll = 0;
339 best_prd = 0;
340 best_fbd = 0;
341
342 for (prd = 1; prd <= 16; ++prd) {
343 u32 divisor = prd * (1 << frs);
344 u32 fbd;
345
346 for (fbd = 1; fbd <= 512; ++fbd) {
347 u32 pll, diff, pll_in;
348
349 pll = (u32)div_u64((u64)refclk * fbd, divisor);
350
351 if (pll >= max_pll || pll < min_pll)
352 continue;
353
354 pll_in = (u32)div_u64((u64)refclk, prd);
355 if (pll_in < 4000000)
356 continue;
357
358 diff = max(pll, target_pll) - min(pll, target_pll);
359
360 if (diff < best_diff) {
361 best_diff = diff;
362 best_pll = pll;
363 best_prd = prd;
364 best_fbd = fbd;
365
366 if (best_diff == 0)
367 goto found;
368 }
369 }
370 }
371
372 if (best_diff == UINT_MAX) {
373 dev_err(priv->dev, "could not find suitable PLL setup\n");
374 return -EINVAL;
375 }
376
377found:
378 if (verify_only)
379 return 0;
380
381 priv->fbd = best_fbd;
382 priv->prd = best_prd;
383 priv->frs = frs;
384 priv->dsiclk = best_pll / 2;
385 priv->pclk = mode->clock * 1000;
386
387 return 0;
388}
389
390static int tc358768_dsi_host_attach(struct mipi_dsi_host *host,
391 struct mipi_dsi_device *dev)
392{
393 struct tc358768_priv *priv = dsi_host_to_tc358768(host);
394 struct drm_bridge *bridge;
395 struct drm_panel *panel;
396 struct device_node *ep;
397 int ret;
398
399 if (dev->lanes > 4) {
400 dev_err(priv->dev, "unsupported number of data lanes(%u)\n",
401 dev->lanes);
402 return -EINVAL;
403 }
404
405 /*
406 * tc358768 supports both Video and Pulse mode, but the driver only
407 * implements Video (event) mode currently
408 */
409 if (!(dev->mode_flags & MIPI_DSI_MODE_VIDEO)) {
410 dev_err(priv->dev, "Only MIPI_DSI_MODE_VIDEO is supported\n");
411 return -ENOTSUPP;
412 }
413
414 /*
415 * tc358768 supports RGB888, RGB666, RGB666_PACKED and RGB565, but only
416 * RGB888 is verified.
417 */
418 if (dev->format != MIPI_DSI_FMT_RGB888) {
419 dev_warn(priv->dev, "Only MIPI_DSI_FMT_RGB888 tested!\n");
420 return -ENOTSUPP;
421 }
422
423 ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0, &panel,
424 &bridge);
425 if (ret)
426 return ret;
427
428 if (panel) {
429 bridge = drm_panel_bridge_add_typed(panel,
430 DRM_MODE_CONNECTOR_DSI);
431 if (IS_ERR(bridge))
432 return PTR_ERR(bridge);
433 }
434
435 priv->output.dev = dev;
436 priv->output.bridge = bridge;
437 priv->output.panel = panel;
438
439 priv->dsi_lanes = dev->lanes;
440 priv->dsi_bpp = mipi_dsi_pixel_format_to_bpp(dev->format);
441
442 /* get input ep (port0/endpoint0) */
443 ret = -EINVAL;
444 ep = of_graph_get_endpoint_by_regs(host->dev->of_node, 0, 0);
445 if (ep) {
446 ret = of_property_read_u32(ep, "data-lines", &priv->pd_lines);
447
448 of_node_put(ep);
449 }
450
451 if (ret)
452 priv->pd_lines = priv->dsi_bpp;
453
454 drm_bridge_add(&priv->bridge);
455
456 return 0;
457}
458
459static int tc358768_dsi_host_detach(struct mipi_dsi_host *host,
460 struct mipi_dsi_device *dev)
461{
462 struct tc358768_priv *priv = dsi_host_to_tc358768(host);
463
464 drm_bridge_remove(&priv->bridge);
465 if (priv->output.panel)
466 drm_panel_bridge_remove(priv->output.bridge);
467
468 return 0;
469}
470
471static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host,
472 const struct mipi_dsi_msg *msg)
473{
474 struct tc358768_priv *priv = dsi_host_to_tc358768(host);
475 struct mipi_dsi_packet packet;
476 int ret;
477
478 if (!priv->enabled) {
479 dev_err(priv->dev, "Bridge is not enabled\n");
480 return -ENODEV;
481 }
482
483 if (msg->rx_len) {
484 dev_warn(priv->dev, "MIPI rx is not supported\n");
485 return -ENOTSUPP;
486 }
487
488 if (msg->tx_len > 8) {
489 dev_warn(priv->dev, "Maximum 8 byte MIPI tx is supported\n");
490 return -ENOTSUPP;
491 }
492
493 ret = mipi_dsi_create_packet(&packet, msg);
494 if (ret)
495 return ret;
496
497 if (mipi_dsi_packet_format_is_short(msg->type)) {
498 tc358768_write(priv, TC358768_DSICMD_TYPE,
499 (0x10 << 8) | (packet.header[0] & 0x3f));
500 tc358768_write(priv, TC358768_DSICMD_WC, 0);
501 tc358768_write(priv, TC358768_DSICMD_WD0,
502 (packet.header[2] << 8) | packet.header[1]);
503 } else {
504 int i;
505
506 tc358768_write(priv, TC358768_DSICMD_TYPE,
507 (0x40 << 8) | (packet.header[0] & 0x3f));
508 tc358768_write(priv, TC358768_DSICMD_WC, packet.payload_length);
509 for (i = 0; i < packet.payload_length; i += 2) {
510 u16 val = packet.payload[i];
511
512 if (i + 1 < packet.payload_length)
513 val |= packet.payload[i + 1] << 8;
514
515 tc358768_write(priv, TC358768_DSICMD_WD0 + i, val);
516 }
517 }
518
519 /* start transfer */
520 tc358768_write(priv, TC358768_DSICMD_TX, 1);
521
522 ret = tc358768_clear_error(priv);
523 if (ret)
524 dev_warn(priv->dev, "Software disable failed: %d\n", ret);
525 else
526 ret = packet.size;
527
528 return ret;
529}
530
531static const struct mipi_dsi_host_ops tc358768_dsi_host_ops = {
532 .attach = tc358768_dsi_host_attach,
533 .detach = tc358768_dsi_host_detach,
534 .transfer = tc358768_dsi_host_transfer,
535};
536
537static int tc358768_bridge_attach(struct drm_bridge *bridge,
538 enum drm_bridge_attach_flags flags)
539{
540 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
541
542 if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) {
543 dev_err(priv->dev, "needs atomic updates support\n");
544 return -ENOTSUPP;
545 }
546
547 return drm_bridge_attach(bridge->encoder, priv->output.bridge, bridge,
548 flags);
549}
550
551static enum drm_mode_status
552tc358768_bridge_mode_valid(struct drm_bridge *bridge,
553 const struct drm_display_info *info,
554 const struct drm_display_mode *mode)
555{
556 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
557
558 if (tc358768_calc_pll(priv, mode, true))
559 return MODE_CLOCK_RANGE;
560
561 return MODE_OK;
562}
563
564static void tc358768_bridge_disable(struct drm_bridge *bridge)
565{
566 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
567 int ret;
568
569 /* set FrmStop */
570 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(15), BIT(15));
571
572 /* wait at least for one frame */
573 msleep(50);
574
575 /* clear PP_en */
576 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), 0);
577
578 /* set RstPtr */
579 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(14), BIT(14));
580
581 ret = tc358768_clear_error(priv);
582 if (ret)
583 dev_warn(priv->dev, "Software disable failed: %d\n", ret);
584}
585
586static void tc358768_bridge_post_disable(struct drm_bridge *bridge)
587{
588 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
589
590 tc358768_hw_disable(priv);
591}
592
593static int tc358768_setup_pll(struct tc358768_priv *priv,
594 const struct drm_display_mode *mode)
595{
596 u32 fbd, prd, frs;
597 int ret;
598
599 ret = tc358768_calc_pll(priv, mode, false);
600 if (ret) {
601 dev_err(priv->dev, "PLL calculation failed: %d\n", ret);
602 return ret;
603 }
604
605 fbd = priv->fbd;
606 prd = priv->prd;
607 frs = priv->frs;
608
609 dev_dbg(priv->dev, "PLL: refclk %lu, fbd %u, prd %u, frs %u\n",
610 clk_get_rate(priv->refclk), fbd, prd, frs);
611 dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, HSByteClk %u\n",
612 priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4);
613 dev_dbg(priv->dev, "PLL: pclk %u (panel: %u)\n",
614 tc358768_pll_to_pclk(priv, priv->dsiclk * 2),
615 mode->clock * 1000);
616
617 /* PRD[15:12] FBD[8:0] */
618 tc358768_write(priv, TC358768_PLLCTL0, ((prd - 1) << 12) | (fbd - 1));
619
620 /* FRS[11:10] LBWS[9:8] CKEN[4] RESETB[1] EN[0] */
621 tc358768_write(priv, TC358768_PLLCTL1,
622 (frs << 10) | (0x2 << 8) | BIT(1) | BIT(0));
623
624 /* wait for lock */
625 usleep_range(1000, 2000);
626
627 /* FRS[11:10] LBWS[9:8] CKEN[4] PLL_CKEN[4] RESETB[1] EN[0] */
628 tc358768_write(priv, TC358768_PLLCTL1,
629 (frs << 10) | (0x2 << 8) | BIT(4) | BIT(1) | BIT(0));
630
631 return tc358768_clear_error(priv);
632}
633
634static u32 tc358768_ns_to_cnt(u32 ns, u32 period_ps)
635{
636 return DIV_ROUND_UP(ns * 1000, period_ps);
637}
638
639static u32 tc358768_ps_to_ns(u32 ps)
640{
641 return ps / 1000;
642}
643
644static u32 tc358768_dpi_to_ns(u32 val, u32 pclk)
645{
646 return (u32)div_u64((u64)val * NANO, pclk);
647}
648
649/* Convert value in DPI pixel clock units to DSI byte count */
650static u32 tc358768_dpi_to_dsi_bytes(struct tc358768_priv *priv, u32 val)
651{
652 u64 m = (u64)val * priv->dsiclk / 4 * priv->dsi_lanes;
653 u64 n = priv->pclk;
654
655 return (u32)div_u64(m + n - 1, n);
656}
657
658static u32 tc358768_dsi_bytes_to_ns(struct tc358768_priv *priv, u32 val)
659{
660 u64 m = (u64)val * NANO;
661 u64 n = priv->dsiclk / 4 * priv->dsi_lanes;
662
663 return (u32)div_u64(m, n);
664}
665
666static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
667{
668 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
669 struct mipi_dsi_device *dsi_dev = priv->output.dev;
670 unsigned long mode_flags = dsi_dev->mode_flags;
671 u32 val, val2, lptxcnt, hact, data_type;
672 s32 raw_val;
673 const struct drm_display_mode *mode;
674 u32 hsbyteclk_ps, dsiclk_ps, ui_ps;
675 u32 dsiclk, hsbyteclk;
676 int ret, i;
677 struct videomode vm;
678 struct device *dev = priv->dev;
679 /* In pixelclock units */
680 u32 dpi_htot, dpi_data_start;
681 /* In byte units */
682 u32 dsi_dpi_htot, dsi_dpi_data_start;
683 u32 dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp;
684 const u32 dsi_hss = 4; /* HSS is a short packet (4 bytes) */
685 /* In hsbyteclk units */
686 u32 dsi_vsdly;
687 const u32 internal_dly = 40;
688
689 if (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
690 dev_warn_once(dev, "Non-continuous mode unimplemented, falling back to continuous\n");
691 mode_flags &= ~MIPI_DSI_CLOCK_NON_CONTINUOUS;
692 }
693
694 tc358768_hw_enable(priv);
695
696 ret = tc358768_sw_reset(priv);
697 if (ret) {
698 dev_err(dev, "Software reset failed: %d\n", ret);
699 tc358768_hw_disable(priv);
700 return;
701 }
702
703 mode = &bridge->encoder->crtc->state->adjusted_mode;
704 ret = tc358768_setup_pll(priv, mode);
705 if (ret) {
706 dev_err(dev, "PLL setup failed: %d\n", ret);
707 tc358768_hw_disable(priv);
708 return;
709 }
710
711 drm_display_mode_to_videomode(mode, &vm);
712
713 dsiclk = priv->dsiclk;
714 hsbyteclk = dsiclk / 4;
715
716 /* Data Format Control Register */
717 val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */
718 switch (dsi_dev->format) {
719 case MIPI_DSI_FMT_RGB888:
720 val |= (0x3 << 4);
721 hact = vm.hactive * 3;
722 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24;
723 break;
724 case MIPI_DSI_FMT_RGB666:
725 val |= (0x4 << 4);
726 hact = vm.hactive * 3;
727 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18;
728 break;
729
730 case MIPI_DSI_FMT_RGB666_PACKED:
731 val |= (0x4 << 4) | BIT(3);
732 hact = vm.hactive * 18 / 8;
733 data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
734 break;
735
736 case MIPI_DSI_FMT_RGB565:
737 val |= (0x5 << 4);
738 hact = vm.hactive * 2;
739 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16;
740 break;
741 default:
742 dev_err(dev, "Invalid data format (%u)\n",
743 dsi_dev->format);
744 tc358768_hw_disable(priv);
745 return;
746 }
747
748 /*
749 * There are three important things to make TC358768 work correctly,
750 * which are not trivial to manage:
751 *
752 * 1. Keep the DPI line-time and the DSI line-time as close to each
753 * other as possible.
754 * 2. TC358768 goes to LP mode after each line's active area. The DSI
755 * HFP period has to be long enough for entering and exiting LP mode.
756 * But it is not clear how to calculate this.
757 * 3. VSDly (video start delay) has to be long enough to ensure that the
758 * DSI TX does not start transmitting until we have started receiving
759 * pixel data from the DPI input. It is not clear how to calculate
760 * this either.
761 */
762
763 dpi_htot = vm.hactive + vm.hfront_porch + vm.hsync_len + vm.hback_porch;
764 dpi_data_start = vm.hsync_len + vm.hback_porch;
765
766 dev_dbg(dev, "dpi horiz timing (pclk): %u + %u + %u + %u = %u\n",
767 vm.hsync_len, vm.hback_porch, vm.hactive, vm.hfront_porch,
768 dpi_htot);
769
770 dev_dbg(dev, "dpi horiz timing (ns): %u + %u + %u + %u = %u\n",
771 tc358768_dpi_to_ns(vm.hsync_len, vm.pixelclock),
772 tc358768_dpi_to_ns(vm.hback_porch, vm.pixelclock),
773 tc358768_dpi_to_ns(vm.hactive, vm.pixelclock),
774 tc358768_dpi_to_ns(vm.hfront_porch, vm.pixelclock),
775 tc358768_dpi_to_ns(dpi_htot, vm.pixelclock));
776
777 dev_dbg(dev, "dpi data start (ns): %u + %u = %u\n",
778 tc358768_dpi_to_ns(vm.hsync_len, vm.pixelclock),
779 tc358768_dpi_to_ns(vm.hback_porch, vm.pixelclock),
780 tc358768_dpi_to_ns(dpi_data_start, vm.pixelclock));
781
782 dsi_dpi_htot = tc358768_dpi_to_dsi_bytes(priv, dpi_htot);
783 dsi_dpi_data_start = tc358768_dpi_to_dsi_bytes(priv, dpi_data_start);
784
785 if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
786 dsi_hsw = tc358768_dpi_to_dsi_bytes(priv, vm.hsync_len);
787 dsi_hbp = tc358768_dpi_to_dsi_bytes(priv, vm.hback_porch);
788 } else {
789 /* HBP is included in HSW in event mode */
790 dsi_hbp = 0;
791 dsi_hsw = tc358768_dpi_to_dsi_bytes(priv,
792 vm.hsync_len +
793 vm.hback_porch);
794
795 /*
796 * The pixel packet includes the actual pixel data, and:
797 * DSI packet header = 4 bytes
798 * DCS code = 1 byte
799 * DSI packet footer = 2 bytes
800 */
801 dsi_hact = hact + 4 + 1 + 2;
802
803 dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss;
804
805 /*
806 * Here we should check if HFP is long enough for entering LP
807 * and exiting LP, but it's not clear how to calculate that.
808 * Instead, this is a naive algorithm that just adjusts the HFP
809 * and HSW so that HFP is (at least) roughly 2/3 of the total
810 * blanking time.
811 */
812 if (dsi_hfp < (dsi_hfp + dsi_hsw + dsi_hss) * 2 / 3) {
813 u32 old_hfp = dsi_hfp;
814 u32 old_hsw = dsi_hsw;
815 u32 tot = dsi_hfp + dsi_hsw + dsi_hss;
816
817 dsi_hsw = tot / 3;
818
819 /*
820 * Seems like sometimes HSW has to be divisible by num-lanes, but
821 * not always...
822 */
823 dsi_hsw = roundup(dsi_hsw, priv->dsi_lanes);
824
825 dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss;
826
827 dev_dbg(dev,
828 "hfp too short, adjusting dsi hfp and dsi hsw from %u, %u to %u, %u\n",
829 old_hfp, old_hsw, dsi_hfp, dsi_hsw);
830 }
831
832 dev_dbg(dev,
833 "dsi horiz timing (bytes): %u, %u + %u + %u + %u = %u\n",
834 dsi_hss, dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp,
835 dsi_hss + dsi_hsw + dsi_hbp + dsi_hact + dsi_hfp);
836
837 dev_dbg(dev, "dsi horiz timing (ns): %u + %u + %u + %u + %u = %u\n",
838 tc358768_dsi_bytes_to_ns(priv, dsi_hss),
839 tc358768_dsi_bytes_to_ns(priv, dsi_hsw),
840 tc358768_dsi_bytes_to_ns(priv, dsi_hbp),
841 tc358768_dsi_bytes_to_ns(priv, dsi_hact),
842 tc358768_dsi_bytes_to_ns(priv, dsi_hfp),
843 tc358768_dsi_bytes_to_ns(priv, dsi_hss + dsi_hsw +
844 dsi_hbp + dsi_hact + dsi_hfp));
845 }
846
847 /* VSDly calculation */
848
849 /* Start with the HW internal delay */
850 dsi_vsdly = internal_dly;
851
852 /* Convert to byte units as the other variables are in byte units */
853 dsi_vsdly *= priv->dsi_lanes;
854
855 /* Do we need more delay, in addition to the internal? */
856 if (dsi_dpi_data_start > dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp) {
857 dsi_vsdly = dsi_dpi_data_start - dsi_hss - dsi_hsw - dsi_hbp;
858 dsi_vsdly = roundup(dsi_vsdly, priv->dsi_lanes);
859 }
860
861 dev_dbg(dev, "dsi data start (bytes) %u + %u + %u + %u = %u\n",
862 dsi_vsdly, dsi_hss, dsi_hsw, dsi_hbp,
863 dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp);
864
865 dev_dbg(dev, "dsi data start (ns) %u + %u + %u + %u = %u\n",
866 tc358768_dsi_bytes_to_ns(priv, dsi_vsdly),
867 tc358768_dsi_bytes_to_ns(priv, dsi_hss),
868 tc358768_dsi_bytes_to_ns(priv, dsi_hsw),
869 tc358768_dsi_bytes_to_ns(priv, dsi_hbp),
870 tc358768_dsi_bytes_to_ns(priv, dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp));
871
872 /* Convert back to hsbyteclk */
873 dsi_vsdly /= priv->dsi_lanes;
874
875 /*
876 * The docs say that there is an internal delay of 40 cycles.
877 * However, we get underflows if we follow that rule. If we
878 * instead ignore the internal delay, things work. So either
879 * the docs are wrong or the calculations are wrong.
880 *
881 * As a temporary fix, add the internal delay here, to counter
882 * the subtraction when writing the register.
883 */
884 dsi_vsdly += internal_dly;
885
886 /* Clamp to the register max */
887 if (dsi_vsdly - internal_dly > 0x3ff) {
888 dev_warn(dev, "VSDly too high, underflows likely\n");
889 dsi_vsdly = 0x3ff + internal_dly;
890 }
891
892 /* VSDly[9:0] */
893 tc358768_write(priv, TC358768_VSDLY, dsi_vsdly - internal_dly);
894
895 tc358768_write(priv, TC358768_DATAFMT, val);
896 tc358768_write(priv, TC358768_DSITX_DT, data_type);
897
898 /* Enable D-PHY (HiZ->LP11) */
899 tc358768_write(priv, TC358768_CLW_CNTRL, 0x0000);
900 /* Enable lanes */
901 for (i = 0; i < dsi_dev->lanes; i++)
902 tc358768_write(priv, TC358768_D0W_CNTRL + i * 4, 0x0000);
903
904 /* DSI Timings */
905 hsbyteclk_ps = (u32)div_u64(PICO, hsbyteclk);
906 dsiclk_ps = (u32)div_u64(PICO, dsiclk);
907 ui_ps = dsiclk_ps / 2;
908 dev_dbg(dev, "dsiclk: %u ps, ui %u ps, hsbyteclk %u ps\n", dsiclk_ps,
909 ui_ps, hsbyteclk_ps);
910
911 /* LP11 > 100us for D-PHY Rx Init */
912 val = tc358768_ns_to_cnt(100 * 1000, hsbyteclk_ps) - 1;
913 dev_dbg(dev, "LINEINITCNT: %u\n", val);
914 tc358768_write(priv, TC358768_LINEINITCNT, val);
915
916 /* LPTimeCnt > 50ns */
917 val = tc358768_ns_to_cnt(50, hsbyteclk_ps) - 1;
918 lptxcnt = val;
919 dev_dbg(dev, "LPTXTIMECNT: %u\n", val);
920 tc358768_write(priv, TC358768_LPTXTIMECNT, val);
921
922 /* 38ns < TCLK_PREPARE < 95ns */
923 val = tc358768_ns_to_cnt(65, hsbyteclk_ps) - 1;
924 dev_dbg(dev, "TCLK_PREPARECNT %u\n", val);
925 /* TCLK_PREPARE + TCLK_ZERO > 300ns */
926 val2 = tc358768_ns_to_cnt(300 - tc358768_ps_to_ns(2 * ui_ps),
927 hsbyteclk_ps) - 2;
928 dev_dbg(dev, "TCLK_ZEROCNT %u\n", val2);
929 val |= val2 << 8;
930 tc358768_write(priv, TC358768_TCLK_HEADERCNT, val);
931
932 /* TCLK_TRAIL > 60ns AND TEOT <= 105 ns + 12*UI */
933 raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(2 * ui_ps), hsbyteclk_ps) - 5;
934 val = clamp(raw_val, 0, 127);
935 dev_dbg(dev, "TCLK_TRAILCNT: %u\n", val);
936 tc358768_write(priv, TC358768_TCLK_TRAILCNT, val);
937
938 /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */
939 val = 50 + tc358768_ps_to_ns(4 * ui_ps);
940 val = tc358768_ns_to_cnt(val, hsbyteclk_ps) - 1;
941 dev_dbg(dev, "THS_PREPARECNT %u\n", val);
942 /* THS_PREPARE + THS_ZERO > 145ns + 10*UI */
943 raw_val = tc358768_ns_to_cnt(145 - tc358768_ps_to_ns(3 * ui_ps), hsbyteclk_ps) - 10;
944 val2 = clamp(raw_val, 0, 127);
945 dev_dbg(dev, "THS_ZEROCNT %u\n", val2);
946 val |= val2 << 8;
947 tc358768_write(priv, TC358768_THS_HEADERCNT, val);
948
949 /* TWAKEUP > 1ms in lptxcnt steps */
950 val = tc358768_ns_to_cnt(1020000, hsbyteclk_ps);
951 val = val / (lptxcnt + 1) - 1;
952 dev_dbg(dev, "TWAKEUP: %u\n", val);
953 tc358768_write(priv, TC358768_TWAKEUP, val);
954
955 /* TCLK_POSTCNT > 60ns + 52*UI */
956 val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(52 * ui_ps),
957 hsbyteclk_ps) - 3;
958 dev_dbg(dev, "TCLK_POSTCNT: %u\n", val);
959 tc358768_write(priv, TC358768_TCLK_POSTCNT, val);
960
961 /* max(60ns + 4*UI, 8*UI) < THS_TRAILCNT < 105ns + 12*UI */
962 raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(18 * ui_ps),
963 hsbyteclk_ps) - 4;
964 val = clamp(raw_val, 0, 15);
965 dev_dbg(dev, "THS_TRAILCNT: %u\n", val);
966 tc358768_write(priv, TC358768_THS_TRAILCNT, val);
967
968 val = BIT(0);
969 for (i = 0; i < dsi_dev->lanes; i++)
970 val |= BIT(i + 1);
971 tc358768_write(priv, TC358768_HSTXVREGEN, val);
972
973 tc358768_write(priv, TC358768_TXOPTIONCNTRL,
974 (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) ? 0 : BIT(0));
975
976 /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
977 val = tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps * 4);
978 val = tc358768_ns_to_cnt(val, hsbyteclk_ps) / 4 - 1;
979 dev_dbg(dev, "TXTAGOCNT: %u\n", val);
980 val2 = tc358768_ns_to_cnt(tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps),
981 hsbyteclk_ps) - 2;
982 dev_dbg(dev, "RXTASURECNT: %u\n", val2);
983 val = val << 16 | val2;
984 tc358768_write(priv, TC358768_BTACNTRL1, val);
985
986 /* START[0] */
987 tc358768_write(priv, TC358768_STARTCNTRL, 1);
988
989 if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
990 /* Set pulse mode */
991 tc358768_write(priv, TC358768_DSI_EVENT, 0);
992
993 /* vact */
994 tc358768_write(priv, TC358768_DSI_VACT, vm.vactive);
995
996 /* vsw */
997 tc358768_write(priv, TC358768_DSI_VSW, vm.vsync_len);
998
999 /* vbp */
1000 tc358768_write(priv, TC358768_DSI_VBPR, vm.vback_porch);
1001 } else {
1002 /* Set event mode */
1003 tc358768_write(priv, TC358768_DSI_EVENT, 1);
1004
1005 /* vact */
1006 tc358768_write(priv, TC358768_DSI_VACT, vm.vactive);
1007
1008 /* vsw (+ vbp) */
1009 tc358768_write(priv, TC358768_DSI_VSW,
1010 vm.vsync_len + vm.vback_porch);
1011
1012 /* vbp (not used in event mode) */
1013 tc358768_write(priv, TC358768_DSI_VBPR, 0);
1014 }
1015
1016 /* hsw (bytes) */
1017 tc358768_write(priv, TC358768_DSI_HSW, dsi_hsw);
1018
1019 /* hbp (bytes) */
1020 tc358768_write(priv, TC358768_DSI_HBPR, dsi_hbp);
1021
1022 /* hact (bytes) */
1023 tc358768_write(priv, TC358768_DSI_HACT, hact);
1024
1025 /* VSYNC polarity */
1026 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5),
1027 (mode->flags & DRM_MODE_FLAG_PVSYNC) ? BIT(5) : 0);
1028
1029 /* HSYNC polarity */
1030 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0),
1031 (mode->flags & DRM_MODE_FLAG_PHSYNC) ? BIT(0) : 0);
1032
1033 /* Start DSI Tx */
1034 tc358768_write(priv, TC358768_DSI_START, 0x1);
1035
1036 /* Configure DSI_Control register */
1037 val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
1038 val |= TC358768_DSI_CONTROL_TXMD | TC358768_DSI_CONTROL_HSCKMD |
1039 0x3 << 1 | TC358768_DSI_CONTROL_EOTDIS;
1040 tc358768_write(priv, TC358768_DSI_CONFW, val);
1041
1042 val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
1043 val |= (dsi_dev->lanes - 1) << 1;
1044
1045 val |= TC358768_DSI_CONTROL_TXMD;
1046
1047 if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
1048 val |= TC358768_DSI_CONTROL_HSCKMD;
1049
1050 if (dsi_dev->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET)
1051 val |= TC358768_DSI_CONTROL_EOTDIS;
1052
1053 tc358768_write(priv, TC358768_DSI_CONFW, val);
1054
1055 val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
1056 val |= TC358768_DSI_CONTROL_DIS_MODE; /* DSI mode */
1057 tc358768_write(priv, TC358768_DSI_CONFW, val);
1058
1059 ret = tc358768_clear_error(priv);
1060 if (ret) {
1061 dev_err(dev, "Bridge pre_enable failed: %d\n", ret);
1062 tc358768_bridge_disable(bridge);
1063 tc358768_bridge_post_disable(bridge);
1064 }
1065}
1066
1067static void tc358768_bridge_enable(struct drm_bridge *bridge)
1068{
1069 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
1070 int ret;
1071
1072 if (!priv->enabled) {
1073 dev_err(priv->dev, "Bridge is not enabled\n");
1074 return;
1075 }
1076
1077 /* clear FrmStop and RstPtr */
1078 tc358768_update_bits(priv, TC358768_PP_MISC, 0x3 << 14, 0);
1079
1080 /* set PP_en */
1081 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), BIT(6));
1082
1083 ret = tc358768_clear_error(priv);
1084 if (ret) {
1085 dev_err(priv->dev, "Bridge enable failed: %d\n", ret);
1086 tc358768_bridge_disable(bridge);
1087 tc358768_bridge_post_disable(bridge);
1088 }
1089}
1090
1091#define MAX_INPUT_SEL_FORMATS 1
1092
1093static u32 *
1094tc358768_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
1095 struct drm_bridge_state *bridge_state,
1096 struct drm_crtc_state *crtc_state,
1097 struct drm_connector_state *conn_state,
1098 u32 output_fmt,
1099 unsigned int *num_input_fmts)
1100{
1101 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
1102 u32 *input_fmts;
1103
1104 *num_input_fmts = 0;
1105
1106 input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
1107 GFP_KERNEL);
1108 if (!input_fmts)
1109 return NULL;
1110
1111 switch (priv->pd_lines) {
1112 case 16:
1113 input_fmts[0] = MEDIA_BUS_FMT_RGB565_1X16;
1114 break;
1115 case 18:
1116 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X18;
1117 break;
1118 default:
1119 case 24:
1120 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
1121 break;
1122 }
1123
1124 *num_input_fmts = MAX_INPUT_SEL_FORMATS;
1125
1126 return input_fmts;
1127}
1128
1129static bool tc358768_mode_fixup(struct drm_bridge *bridge,
1130 const struct drm_display_mode *mode,
1131 struct drm_display_mode *adjusted_mode)
1132{
1133 /* Default to positive sync */
1134
1135 if (!(adjusted_mode->flags &
1136 (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
1137 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
1138
1139 if (!(adjusted_mode->flags &
1140 (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
1141 adjusted_mode->flags |= DRM_MODE_FLAG_PVSYNC;
1142
1143 return true;
1144}
1145
1146static const struct drm_bridge_funcs tc358768_bridge_funcs = {
1147 .attach = tc358768_bridge_attach,
1148 .mode_valid = tc358768_bridge_mode_valid,
1149 .mode_fixup = tc358768_mode_fixup,
1150 .pre_enable = tc358768_bridge_pre_enable,
1151 .enable = tc358768_bridge_enable,
1152 .disable = tc358768_bridge_disable,
1153 .post_disable = tc358768_bridge_post_disable,
1154
1155 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
1156 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
1157 .atomic_reset = drm_atomic_helper_bridge_reset,
1158 .atomic_get_input_bus_fmts = tc358768_atomic_get_input_bus_fmts,
1159};
1160
1161static const struct drm_bridge_timings default_tc358768_timings = {
1162 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
1163 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
1164 | DRM_BUS_FLAG_DE_HIGH,
1165};
1166
1167static bool tc358768_is_reserved_reg(unsigned int reg)
1168{
1169 switch (reg) {
1170 case 0x114 ... 0x13f:
1171 case 0x200:
1172 case 0x20c:
1173 case 0x400 ... 0x408:
1174 case 0x41c ... 0x42f:
1175 return true;
1176 default:
1177 return false;
1178 }
1179}
1180
1181static bool tc358768_writeable_reg(struct device *dev, unsigned int reg)
1182{
1183 if (tc358768_is_reserved_reg(reg))
1184 return false;
1185
1186 switch (reg) {
1187 case TC358768_CHIPID:
1188 case TC358768_FIFOSTATUS:
1189 case TC358768_DSITXSTATUS ... (TC358768_DSITXSTATUS + 2):
1190 case TC358768_DSI_CONTROL ... (TC358768_DSI_INT_ENA + 2):
1191 case TC358768_DSICMD_RDFIFO ... (TC358768_DSI_ERR_HALT + 2):
1192 return false;
1193 default:
1194 return true;
1195 }
1196}
1197
1198static bool tc358768_readable_reg(struct device *dev, unsigned int reg)
1199{
1200 if (tc358768_is_reserved_reg(reg))
1201 return false;
1202
1203 switch (reg) {
1204 case TC358768_STARTCNTRL:
1205 case TC358768_DSI_CONFW ... (TC358768_DSI_CONFW + 2):
1206 case TC358768_DSI_INT_CLR ... (TC358768_DSI_INT_CLR + 2):
1207 case TC358768_DSI_START ... (TC358768_DSI_START + 2):
1208 case TC358768_DBG_DATA:
1209 return false;
1210 default:
1211 return true;
1212 }
1213}
1214
1215static const struct regmap_config tc358768_regmap_config = {
1216 .name = "tc358768",
1217 .reg_bits = 16,
1218 .val_bits = 16,
1219 .max_register = TC358768_DSI_HACT,
1220 .cache_type = REGCACHE_NONE,
1221 .writeable_reg = tc358768_writeable_reg,
1222 .readable_reg = tc358768_readable_reg,
1223 .reg_format_endian = REGMAP_ENDIAN_BIG,
1224 .val_format_endian = REGMAP_ENDIAN_BIG,
1225};
1226
1227static const struct i2c_device_id tc358768_i2c_ids[] = {
1228 { "tc358768", 0 },
1229 { "tc358778", 0 },
1230 { }
1231};
1232MODULE_DEVICE_TABLE(i2c, tc358768_i2c_ids);
1233
1234static const struct of_device_id tc358768_of_ids[] = {
1235 { .compatible = "toshiba,tc358768", },
1236 { .compatible = "toshiba,tc358778", },
1237 { }
1238};
1239MODULE_DEVICE_TABLE(of, tc358768_of_ids);
1240
1241static int tc358768_get_regulators(struct tc358768_priv *priv)
1242{
1243 int i, ret;
1244
1245 for (i = 0; i < ARRAY_SIZE(priv->supplies); ++i)
1246 priv->supplies[i].supply = tc358768_supplies[i];
1247
1248 ret = devm_regulator_bulk_get(priv->dev, ARRAY_SIZE(priv->supplies),
1249 priv->supplies);
1250 if (ret < 0)
1251 dev_err(priv->dev, "failed to get regulators: %d\n", ret);
1252
1253 return ret;
1254}
1255
1256static int tc358768_i2c_probe(struct i2c_client *client)
1257{
1258 struct tc358768_priv *priv;
1259 struct device *dev = &client->dev;
1260 struct device_node *np = dev->of_node;
1261 int ret;
1262
1263 if (!np)
1264 return -ENODEV;
1265
1266 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
1267 if (!priv)
1268 return -ENOMEM;
1269
1270 dev_set_drvdata(dev, priv);
1271 priv->dev = dev;
1272
1273 ret = tc358768_get_regulators(priv);
1274 if (ret)
1275 return ret;
1276
1277 priv->refclk = devm_clk_get(dev, "refclk");
1278 if (IS_ERR(priv->refclk))
1279 return PTR_ERR(priv->refclk);
1280
1281 /*
1282 * RESX is low active, to disable tc358768 initially (keep in reset)
1283 * the gpio line must be LOW. This is the ASSERTED state of
1284 * GPIO_ACTIVE_LOW (GPIOD_OUT_HIGH == ASSERTED).
1285 */
1286 priv->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1287 GPIOD_OUT_HIGH);
1288 if (IS_ERR(priv->reset_gpio))
1289 return PTR_ERR(priv->reset_gpio);
1290
1291 priv->regmap = devm_regmap_init_i2c(client, &tc358768_regmap_config);
1292 if (IS_ERR(priv->regmap)) {
1293 dev_err(dev, "Failed to init regmap\n");
1294 return PTR_ERR(priv->regmap);
1295 }
1296
1297 priv->dsi_host.dev = dev;
1298 priv->dsi_host.ops = &tc358768_dsi_host_ops;
1299
1300 priv->bridge.funcs = &tc358768_bridge_funcs;
1301 priv->bridge.timings = &default_tc358768_timings;
1302 priv->bridge.of_node = np;
1303
1304 i2c_set_clientdata(client, priv);
1305
1306 return mipi_dsi_host_register(&priv->dsi_host);
1307}
1308
1309static void tc358768_i2c_remove(struct i2c_client *client)
1310{
1311 struct tc358768_priv *priv = i2c_get_clientdata(client);
1312
1313 mipi_dsi_host_unregister(&priv->dsi_host);
1314}
1315
1316static struct i2c_driver tc358768_driver = {
1317 .driver = {
1318 .name = "tc358768",
1319 .of_match_table = tc358768_of_ids,
1320 },
1321 .id_table = tc358768_i2c_ids,
1322 .probe = tc358768_i2c_probe,
1323 .remove = tc358768_i2c_remove,
1324};
1325module_i2c_driver(tc358768_driver);
1326
1327MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
1328MODULE_DESCRIPTION("TC358768AXBG/TC358778XBG DSI bridge");
1329MODULE_LICENSE("GPL v2");