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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/module.h>
13#include <linux/regmap.h>
14#include <linux/regulator/consumer.h>
15#include <linux/slab.h>
16
17#include <drm/drm_atomic_helper.h>
18#include <drm/drm_crtc_helper.h>
19#include <drm/drm_drv.h>
20#include <drm/drm_mipi_dsi.h>
21#include <drm/drm_of.h>
22#include <drm/drm_panel.h>
23#include <video/mipi_display.h>
24#include <video/videomode.h>
25
26/* Global (16-bit addressable) */
27#define TC358768_CHIPID 0x0000
28#define TC358768_SYSCTL 0x0002
29#define TC358768_CONFCTL 0x0004
30#define TC358768_VSDLY 0x0006
31#define TC358768_DATAFMT 0x0008
32#define TC358768_GPIOEN 0x000E
33#define TC358768_GPIODIR 0x0010
34#define TC358768_GPIOIN 0x0012
35#define TC358768_GPIOOUT 0x0014
36#define TC358768_PLLCTL0 0x0016
37#define TC358768_PLLCTL1 0x0018
38#define TC358768_CMDBYTE 0x0022
39#define TC358768_PP_MISC 0x0032
40#define TC358768_DSITX_DT 0x0050
41#define TC358768_FIFOSTATUS 0x00F8
42
43/* Debug (16-bit addressable) */
44#define TC358768_VBUFCTRL 0x00E0
45#define TC358768_DBG_WIDTH 0x00E2
46#define TC358768_DBG_VBLANK 0x00E4
47#define TC358768_DBG_DATA 0x00E8
48
49/* TX PHY (32-bit addressable) */
50#define TC358768_CLW_DPHYCONTTX 0x0100
51#define TC358768_D0W_DPHYCONTTX 0x0104
52#define TC358768_D1W_DPHYCONTTX 0x0108
53#define TC358768_D2W_DPHYCONTTX 0x010C
54#define TC358768_D3W_DPHYCONTTX 0x0110
55#define TC358768_CLW_CNTRL 0x0140
56#define TC358768_D0W_CNTRL 0x0144
57#define TC358768_D1W_CNTRL 0x0148
58#define TC358768_D2W_CNTRL 0x014C
59#define TC358768_D3W_CNTRL 0x0150
60
61/* TX PPI (32-bit addressable) */
62#define TC358768_STARTCNTRL 0x0204
63#define TC358768_DSITXSTATUS 0x0208
64#define TC358768_LINEINITCNT 0x0210
65#define TC358768_LPTXTIMECNT 0x0214
66#define TC358768_TCLK_HEADERCNT 0x0218
67#define TC358768_TCLK_TRAILCNT 0x021C
68#define TC358768_THS_HEADERCNT 0x0220
69#define TC358768_TWAKEUP 0x0224
70#define TC358768_TCLK_POSTCNT 0x0228
71#define TC358768_THS_TRAILCNT 0x022C
72#define TC358768_HSTXVREGCNT 0x0230
73#define TC358768_HSTXVREGEN 0x0234
74#define TC358768_TXOPTIONCNTRL 0x0238
75#define TC358768_BTACNTRL1 0x023C
76
77/* TX CTRL (32-bit addressable) */
78#define TC358768_DSI_CONTROL 0x040C
79#define TC358768_DSI_STATUS 0x0410
80#define TC358768_DSI_INT 0x0414
81#define TC358768_DSI_INT_ENA 0x0418
82#define TC358768_DSICMD_RDFIFO 0x0430
83#define TC358768_DSI_ACKERR 0x0434
84#define TC358768_DSI_ACKERR_INTENA 0x0438
85#define TC358768_DSI_ACKERR_HALT 0x043c
86#define TC358768_DSI_RXERR 0x0440
87#define TC358768_DSI_RXERR_INTENA 0x0444
88#define TC358768_DSI_RXERR_HALT 0x0448
89#define TC358768_DSI_ERR 0x044C
90#define TC358768_DSI_ERR_INTENA 0x0450
91#define TC358768_DSI_ERR_HALT 0x0454
92#define TC358768_DSI_CONFW 0x0500
93#define TC358768_DSI_LPCMD 0x0500
94#define TC358768_DSI_RESET 0x0504
95#define TC358768_DSI_INT_CLR 0x050C
96#define TC358768_DSI_START 0x0518
97
98/* DSITX CTRL (16-bit addressable) */
99#define TC358768_DSICMD_TX 0x0600
100#define TC358768_DSICMD_TYPE 0x0602
101#define TC358768_DSICMD_WC 0x0604
102#define TC358768_DSICMD_WD0 0x0610
103#define TC358768_DSICMD_WD1 0x0612
104#define TC358768_DSICMD_WD2 0x0614
105#define TC358768_DSICMD_WD3 0x0616
106#define TC358768_DSI_EVENT 0x0620
107#define TC358768_DSI_VSW 0x0622
108#define TC358768_DSI_VBPR 0x0624
109#define TC358768_DSI_VACT 0x0626
110#define TC358768_DSI_HSW 0x0628
111#define TC358768_DSI_HBPR 0x062A
112#define TC358768_DSI_HACT 0x062C
113
114/* TC358768_DSI_CONTROL (0x040C) register */
115#define TC358768_DSI_CONTROL_DIS_MODE BIT(15)
116#define TC358768_DSI_CONTROL_TXMD BIT(7)
117#define TC358768_DSI_CONTROL_HSCKMD BIT(5)
118#define TC358768_DSI_CONTROL_EOTDIS BIT(0)
119
120/* TC358768_DSI_CONFW (0x0500) register */
121#define TC358768_DSI_CONFW_MODE_SET (5 << 29)
122#define TC358768_DSI_CONFW_MODE_CLR (6 << 29)
123#define TC358768_DSI_CONFW_ADDR_DSI_CONTROL (0x3 << 24)
124
125static const char * const tc358768_supplies[] = {
126 "vddc", "vddmipi", "vddio"
127};
128
129struct tc358768_dsi_output {
130 struct mipi_dsi_device *dev;
131 struct drm_panel *panel;
132 struct drm_bridge *bridge;
133};
134
135struct tc358768_priv {
136 struct device *dev;
137 struct regmap *regmap;
138 struct gpio_desc *reset_gpio;
139 struct regulator_bulk_data supplies[ARRAY_SIZE(tc358768_supplies)];
140 struct clk *refclk;
141 int enabled;
142 int error;
143
144 struct mipi_dsi_host dsi_host;
145 struct drm_bridge bridge;
146 struct tc358768_dsi_output output;
147
148 u32 pd_lines; /* number of Parallel Port Input Data Lines */
149 u32 dsi_lanes; /* number of DSI Lanes */
150
151 /* Parameters for PLL programming */
152 u32 fbd; /* PLL feedback divider */
153 u32 prd; /* PLL input divider */
154 u32 frs; /* PLL Freqency range for HSCK (post divider) */
155
156 u32 dsiclk; /* pll_clk / 2 */
157};
158
159static inline struct tc358768_priv *dsi_host_to_tc358768(struct mipi_dsi_host
160 *host)
161{
162 return container_of(host, struct tc358768_priv, dsi_host);
163}
164
165static inline struct tc358768_priv *bridge_to_tc358768(struct drm_bridge
166 *bridge)
167{
168 return container_of(bridge, struct tc358768_priv, bridge);
169}
170
171static int tc358768_clear_error(struct tc358768_priv *priv)
172{
173 int ret = priv->error;
174
175 priv->error = 0;
176 return ret;
177}
178
179static void tc358768_write(struct tc358768_priv *priv, u32 reg, u32 val)
180{
181 /* work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
182 int tmpval = val;
183 size_t count = 2;
184
185 if (priv->error)
186 return;
187
188 /* 16-bit register? */
189 if (reg < 0x100 || reg >= 0x600)
190 count = 1;
191
192 priv->error = regmap_bulk_write(priv->regmap, reg, &tmpval, count);
193}
194
195static void tc358768_read(struct tc358768_priv *priv, u32 reg, u32 *val)
196{
197 size_t count = 2;
198
199 if (priv->error)
200 return;
201
202 /* 16-bit register? */
203 if (reg < 0x100 || reg >= 0x600) {
204 *val = 0;
205 count = 1;
206 }
207
208 priv->error = regmap_bulk_read(priv->regmap, reg, val, count);
209}
210
211static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask,
212 u32 val)
213{
214 u32 tmp, orig;
215
216 tc358768_read(priv, reg, &orig);
217 tmp = orig & ~mask;
218 tmp |= val & mask;
219 if (tmp != orig)
220 tc358768_write(priv, reg, tmp);
221}
222
223static int tc358768_sw_reset(struct tc358768_priv *priv)
224{
225 /* Assert Reset */
226 tc358768_write(priv, TC358768_SYSCTL, 1);
227 /* Release Reset, Exit Sleep */
228 tc358768_write(priv, TC358768_SYSCTL, 0);
229
230 return tc358768_clear_error(priv);
231}
232
233static void tc358768_hw_enable(struct tc358768_priv *priv)
234{
235 int ret;
236
237 if (priv->enabled)
238 return;
239
240 ret = clk_prepare_enable(priv->refclk);
241 if (ret < 0)
242 dev_err(priv->dev, "error enabling refclk (%d)\n", ret);
243
244 ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
245 if (ret < 0)
246 dev_err(priv->dev, "error enabling regulators (%d)\n", ret);
247
248 if (priv->reset_gpio)
249 usleep_range(200, 300);
250
251 /*
252 * The RESX is active low (GPIO_ACTIVE_LOW).
253 * DEASSERT (value = 0) the reset_gpio to enable the chip
254 */
255 gpiod_set_value_cansleep(priv->reset_gpio, 0);
256
257 /* wait for encoder clocks to stabilize */
258 usleep_range(1000, 2000);
259
260 priv->enabled = true;
261}
262
263static void tc358768_hw_disable(struct tc358768_priv *priv)
264{
265 int ret;
266
267 if (!priv->enabled)
268 return;
269
270 /*
271 * The RESX is active low (GPIO_ACTIVE_LOW).
272 * ASSERT (value = 1) the reset_gpio to disable the chip
273 */
274 gpiod_set_value_cansleep(priv->reset_gpio, 1);
275
276 ret = regulator_bulk_disable(ARRAY_SIZE(priv->supplies),
277 priv->supplies);
278 if (ret < 0)
279 dev_err(priv->dev, "error disabling regulators (%d)\n", ret);
280
281 clk_disable_unprepare(priv->refclk);
282
283 priv->enabled = false;
284}
285
286static u32 tc358768_pll_to_pclk(struct tc358768_priv *priv, u32 pll_clk)
287{
288 return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->pd_lines);
289}
290
291static u32 tc358768_pclk_to_pll(struct tc358768_priv *priv, u32 pclk)
292{
293 return (u32)div_u64((u64)pclk * priv->pd_lines, priv->dsi_lanes);
294}
295
296static int tc358768_calc_pll(struct tc358768_priv *priv,
297 const struct drm_display_mode *mode,
298 bool verify_only)
299{
300 static const u32 frs_limits[] = {
301 1000000000,
302 500000000,
303 250000000,
304 125000000,
305 62500000
306 };
307 unsigned long refclk;
308 u32 prd, target_pll, i, max_pll, min_pll;
309 u32 frs, best_diff, best_pll, best_prd, best_fbd;
310
311 target_pll = tc358768_pclk_to_pll(priv, mode->clock * 1000);
312
313 /* pll_clk = RefClk * [(FBD + 1)/ (PRD + 1)] * [1 / (2^FRS)] */
314
315 for (i = 0; i < ARRAY_SIZE(frs_limits); i++)
316 if (target_pll >= frs_limits[i])
317 break;
318
319 if (i == ARRAY_SIZE(frs_limits) || i == 0)
320 return -EINVAL;
321
322 frs = i - 1;
323 max_pll = frs_limits[i - 1];
324 min_pll = frs_limits[i];
325
326 refclk = clk_get_rate(priv->refclk);
327
328 best_diff = UINT_MAX;
329 best_pll = 0;
330 best_prd = 0;
331 best_fbd = 0;
332
333 for (prd = 0; prd < 16; ++prd) {
334 u32 divisor = (prd + 1) * (1 << frs);
335 u32 fbd;
336
337 for (fbd = 0; fbd < 512; ++fbd) {
338 u32 pll, diff;
339
340 pll = (u32)div_u64((u64)refclk * (fbd + 1), divisor);
341
342 if (pll >= max_pll || pll < min_pll)
343 continue;
344
345 diff = max(pll, target_pll) - min(pll, target_pll);
346
347 if (diff < best_diff) {
348 best_diff = diff;
349 best_pll = pll;
350 best_prd = prd;
351 best_fbd = fbd;
352
353 if (best_diff == 0)
354 goto found;
355 }
356 }
357 }
358
359 if (best_diff == UINT_MAX) {
360 dev_err(priv->dev, "could not find suitable PLL setup\n");
361 return -EINVAL;
362 }
363
364found:
365 if (verify_only)
366 return 0;
367
368 priv->fbd = best_fbd;
369 priv->prd = best_prd;
370 priv->frs = frs;
371 priv->dsiclk = best_pll / 2;
372
373 return 0;
374}
375
376static int tc358768_dsi_host_attach(struct mipi_dsi_host *host,
377 struct mipi_dsi_device *dev)
378{
379 struct tc358768_priv *priv = dsi_host_to_tc358768(host);
380 struct drm_bridge *bridge;
381 struct drm_panel *panel;
382 struct device_node *ep;
383 int ret;
384
385 if (dev->lanes > 4) {
386 dev_err(priv->dev, "unsupported number of data lanes(%u)\n",
387 dev->lanes);
388 return -EINVAL;
389 }
390
391 /*
392 * tc358768 supports both Video and Pulse mode, but the driver only
393 * implements Video (event) mode currently
394 */
395 if (!(dev->mode_flags & MIPI_DSI_MODE_VIDEO)) {
396 dev_err(priv->dev, "Only MIPI_DSI_MODE_VIDEO is supported\n");
397 return -ENOTSUPP;
398 }
399
400 /*
401 * tc358768 supports RGB888, RGB666, RGB666_PACKED and RGB565, but only
402 * RGB888 is verified.
403 */
404 if (dev->format != MIPI_DSI_FMT_RGB888) {
405 dev_warn(priv->dev, "Only MIPI_DSI_FMT_RGB888 tested!\n");
406 return -ENOTSUPP;
407 }
408
409 ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0, &panel,
410 &bridge);
411 if (ret)
412 return ret;
413
414 if (panel) {
415 bridge = drm_panel_bridge_add_typed(panel,
416 DRM_MODE_CONNECTOR_DSI);
417 if (IS_ERR(bridge))
418 return PTR_ERR(bridge);
419 }
420
421 priv->output.dev = dev;
422 priv->output.bridge = bridge;
423 priv->output.panel = panel;
424
425 priv->dsi_lanes = dev->lanes;
426
427 /* get input ep (port0/endpoint0) */
428 ret = -EINVAL;
429 ep = of_graph_get_endpoint_by_regs(host->dev->of_node, 0, 0);
430 if (ep) {
431 ret = of_property_read_u32(ep, "data-lines", &priv->pd_lines);
432
433 of_node_put(ep);
434 }
435
436 if (ret)
437 priv->pd_lines = mipi_dsi_pixel_format_to_bpp(dev->format);
438
439 drm_bridge_add(&priv->bridge);
440
441 return 0;
442}
443
444static int tc358768_dsi_host_detach(struct mipi_dsi_host *host,
445 struct mipi_dsi_device *dev)
446{
447 struct tc358768_priv *priv = dsi_host_to_tc358768(host);
448
449 drm_bridge_remove(&priv->bridge);
450 if (priv->output.panel)
451 drm_panel_bridge_remove(priv->output.bridge);
452
453 return 0;
454}
455
456static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host,
457 const struct mipi_dsi_msg *msg)
458{
459 struct tc358768_priv *priv = dsi_host_to_tc358768(host);
460 struct mipi_dsi_packet packet;
461 int ret;
462
463 if (!priv->enabled) {
464 dev_err(priv->dev, "Bridge is not enabled\n");
465 return -ENODEV;
466 }
467
468 if (msg->rx_len) {
469 dev_warn(priv->dev, "MIPI rx is not supported\n");
470 return -ENOTSUPP;
471 }
472
473 if (msg->tx_len > 8) {
474 dev_warn(priv->dev, "Maximum 8 byte MIPI tx is supported\n");
475 return -ENOTSUPP;
476 }
477
478 ret = mipi_dsi_create_packet(&packet, msg);
479 if (ret)
480 return ret;
481
482 if (mipi_dsi_packet_format_is_short(msg->type)) {
483 tc358768_write(priv, TC358768_DSICMD_TYPE,
484 (0x10 << 8) | (packet.header[0] & 0x3f));
485 tc358768_write(priv, TC358768_DSICMD_WC, 0);
486 tc358768_write(priv, TC358768_DSICMD_WD0,
487 (packet.header[2] << 8) | packet.header[1]);
488 } else {
489 int i;
490
491 tc358768_write(priv, TC358768_DSICMD_TYPE,
492 (0x40 << 8) | (packet.header[0] & 0x3f));
493 tc358768_write(priv, TC358768_DSICMD_WC, packet.payload_length);
494 for (i = 0; i < packet.payload_length; i += 2) {
495 u16 val = packet.payload[i];
496
497 if (i + 1 < packet.payload_length)
498 val |= packet.payload[i + 1] << 8;
499
500 tc358768_write(priv, TC358768_DSICMD_WD0 + i, val);
501 }
502 }
503
504 /* start transfer */
505 tc358768_write(priv, TC358768_DSICMD_TX, 1);
506
507 ret = tc358768_clear_error(priv);
508 if (ret)
509 dev_warn(priv->dev, "Software disable failed: %d\n", ret);
510 else
511 ret = packet.size;
512
513 return ret;
514}
515
516static const struct mipi_dsi_host_ops tc358768_dsi_host_ops = {
517 .attach = tc358768_dsi_host_attach,
518 .detach = tc358768_dsi_host_detach,
519 .transfer = tc358768_dsi_host_transfer,
520};
521
522static int tc358768_bridge_attach(struct drm_bridge *bridge,
523 enum drm_bridge_attach_flags flags)
524{
525 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
526
527 if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) {
528 dev_err(priv->dev, "needs atomic updates support\n");
529 return -ENOTSUPP;
530 }
531
532 return drm_bridge_attach(bridge->encoder, priv->output.bridge, bridge,
533 flags);
534}
535
536static enum drm_mode_status
537tc358768_bridge_mode_valid(struct drm_bridge *bridge,
538 const struct drm_display_info *info,
539 const struct drm_display_mode *mode)
540{
541 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
542
543 if (tc358768_calc_pll(priv, mode, true))
544 return MODE_CLOCK_RANGE;
545
546 return MODE_OK;
547}
548
549static void tc358768_bridge_disable(struct drm_bridge *bridge)
550{
551 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
552 int ret;
553
554 /* set FrmStop */
555 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(15), BIT(15));
556
557 /* wait at least for one frame */
558 msleep(50);
559
560 /* clear PP_en */
561 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), 0);
562
563 /* set RstPtr */
564 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(14), BIT(14));
565
566 ret = tc358768_clear_error(priv);
567 if (ret)
568 dev_warn(priv->dev, "Software disable failed: %d\n", ret);
569}
570
571static void tc358768_bridge_post_disable(struct drm_bridge *bridge)
572{
573 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
574
575 tc358768_hw_disable(priv);
576}
577
578static int tc358768_setup_pll(struct tc358768_priv *priv,
579 const struct drm_display_mode *mode)
580{
581 u32 fbd, prd, frs;
582 int ret;
583
584 ret = tc358768_calc_pll(priv, mode, false);
585 if (ret) {
586 dev_err(priv->dev, "PLL calculation failed: %d\n", ret);
587 return ret;
588 }
589
590 fbd = priv->fbd;
591 prd = priv->prd;
592 frs = priv->frs;
593
594 dev_dbg(priv->dev, "PLL: refclk %lu, fbd %u, prd %u, frs %u\n",
595 clk_get_rate(priv->refclk), fbd, prd, frs);
596 dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, DSIByteClk %u\n",
597 priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4);
598 dev_dbg(priv->dev, "PLL: pclk %u (panel: %u)\n",
599 tc358768_pll_to_pclk(priv, priv->dsiclk * 2),
600 mode->clock * 1000);
601
602 /* PRD[15:12] FBD[8:0] */
603 tc358768_write(priv, TC358768_PLLCTL0, (prd << 12) | fbd);
604
605 /* FRS[11:10] LBWS[9:8] CKEN[4] RESETB[1] EN[0] */
606 tc358768_write(priv, TC358768_PLLCTL1,
607 (frs << 10) | (0x2 << 8) | BIT(1) | BIT(0));
608
609 /* wait for lock */
610 usleep_range(1000, 2000);
611
612 /* FRS[11:10] LBWS[9:8] CKEN[4] PLL_CKEN[4] RESETB[1] EN[0] */
613 tc358768_write(priv, TC358768_PLLCTL1,
614 (frs << 10) | (0x2 << 8) | BIT(4) | BIT(1) | BIT(0));
615
616 return tc358768_clear_error(priv);
617}
618
619#define TC358768_PRECISION 1000
620static u32 tc358768_ns_to_cnt(u32 ns, u32 period_nsk)
621{
622 return (ns * TC358768_PRECISION + period_nsk) / period_nsk;
623}
624
625static u32 tc358768_to_ns(u32 nsk)
626{
627 return (nsk / TC358768_PRECISION);
628}
629
630static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
631{
632 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
633 struct mipi_dsi_device *dsi_dev = priv->output.dev;
634 unsigned long mode_flags = dsi_dev->mode_flags;
635 u32 val, val2, lptxcnt, hact, data_type;
636 const struct drm_display_mode *mode;
637 u32 dsibclk_nsk, dsiclk_nsk, ui_nsk, phy_delay_nsk;
638 u32 dsiclk, dsibclk, video_start;
639 const u32 internal_delay = 40;
640 int ret, i;
641
642 if (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
643 dev_warn_once(priv->dev, "Non-continuous mode unimplemented, falling back to continuous\n");
644 mode_flags &= ~MIPI_DSI_CLOCK_NON_CONTINUOUS;
645 }
646
647 tc358768_hw_enable(priv);
648
649 ret = tc358768_sw_reset(priv);
650 if (ret) {
651 dev_err(priv->dev, "Software reset failed: %d\n", ret);
652 tc358768_hw_disable(priv);
653 return;
654 }
655
656 mode = &bridge->encoder->crtc->state->adjusted_mode;
657 ret = tc358768_setup_pll(priv, mode);
658 if (ret) {
659 dev_err(priv->dev, "PLL setup failed: %d\n", ret);
660 tc358768_hw_disable(priv);
661 return;
662 }
663
664 dsiclk = priv->dsiclk;
665 dsibclk = dsiclk / 4;
666
667 /* Data Format Control Register */
668 val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */
669 switch (dsi_dev->format) {
670 case MIPI_DSI_FMT_RGB888:
671 val |= (0x3 << 4);
672 hact = mode->hdisplay * 3;
673 video_start = (mode->htotal - mode->hsync_start) * 3;
674 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24;
675 break;
676 case MIPI_DSI_FMT_RGB666:
677 val |= (0x4 << 4);
678 hact = mode->hdisplay * 3;
679 video_start = (mode->htotal - mode->hsync_start) * 3;
680 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18;
681 break;
682
683 case MIPI_DSI_FMT_RGB666_PACKED:
684 val |= (0x4 << 4) | BIT(3);
685 hact = mode->hdisplay * 18 / 8;
686 video_start = (mode->htotal - mode->hsync_start) * 18 / 8;
687 data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
688 break;
689
690 case MIPI_DSI_FMT_RGB565:
691 val |= (0x5 << 4);
692 hact = mode->hdisplay * 2;
693 video_start = (mode->htotal - mode->hsync_start) * 2;
694 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16;
695 break;
696 default:
697 dev_err(priv->dev, "Invalid data format (%u)\n",
698 dsi_dev->format);
699 tc358768_hw_disable(priv);
700 return;
701 }
702
703 /* VSDly[9:0] */
704 video_start = max(video_start, internal_delay + 1) - internal_delay;
705 tc358768_write(priv, TC358768_VSDLY, video_start);
706
707 tc358768_write(priv, TC358768_DATAFMT, val);
708 tc358768_write(priv, TC358768_DSITX_DT, data_type);
709
710 /* Enable D-PHY (HiZ->LP11) */
711 tc358768_write(priv, TC358768_CLW_CNTRL, 0x0000);
712 /* Enable lanes */
713 for (i = 0; i < dsi_dev->lanes; i++)
714 tc358768_write(priv, TC358768_D0W_CNTRL + i * 4, 0x0000);
715
716 /* DSI Timings */
717 dsibclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION,
718 dsibclk);
719 dsiclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION, dsiclk);
720 ui_nsk = dsiclk_nsk / 2;
721 phy_delay_nsk = dsibclk_nsk + 2 * dsiclk_nsk;
722 dev_dbg(priv->dev, "dsiclk_nsk: %u\n", dsiclk_nsk);
723 dev_dbg(priv->dev, "ui_nsk: %u\n", ui_nsk);
724 dev_dbg(priv->dev, "dsibclk_nsk: %u\n", dsibclk_nsk);
725 dev_dbg(priv->dev, "phy_delay_nsk: %u\n", phy_delay_nsk);
726
727 /* LP11 > 100us for D-PHY Rx Init */
728 val = tc358768_ns_to_cnt(100 * 1000, dsibclk_nsk) - 1;
729 dev_dbg(priv->dev, "LINEINITCNT: 0x%x\n", val);
730 tc358768_write(priv, TC358768_LINEINITCNT, val);
731
732 /* LPTimeCnt > 50ns */
733 val = tc358768_ns_to_cnt(50, dsibclk_nsk) - 1;
734 lptxcnt = val;
735 dev_dbg(priv->dev, "LPTXTIMECNT: 0x%x\n", val);
736 tc358768_write(priv, TC358768_LPTXTIMECNT, val);
737
738 /* 38ns < TCLK_PREPARE < 95ns */
739 val = tc358768_ns_to_cnt(65, dsibclk_nsk) - 1;
740 /* TCLK_PREPARE > 300ns */
741 val2 = tc358768_ns_to_cnt(300 + tc358768_to_ns(3 * ui_nsk),
742 dsibclk_nsk);
743 val |= (val2 - tc358768_to_ns(phy_delay_nsk - dsibclk_nsk)) << 8;
744 dev_dbg(priv->dev, "TCLK_HEADERCNT: 0x%x\n", val);
745 tc358768_write(priv, TC358768_TCLK_HEADERCNT, val);
746
747 /* TCLK_TRAIL > 60ns + 3*UI */
748 val = 60 + tc358768_to_ns(3 * ui_nsk);
749 val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 5;
750 dev_dbg(priv->dev, "TCLK_TRAILCNT: 0x%x\n", val);
751 tc358768_write(priv, TC358768_TCLK_TRAILCNT, val);
752
753 /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */
754 val = 50 + tc358768_to_ns(4 * ui_nsk);
755 val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1;
756 /* THS_ZERO > 145ns + 10*UI */
757 val2 = tc358768_ns_to_cnt(145 - tc358768_to_ns(ui_nsk), dsibclk_nsk);
758 val |= (val2 - tc358768_to_ns(phy_delay_nsk)) << 8;
759 dev_dbg(priv->dev, "THS_HEADERCNT: 0x%x\n", val);
760 tc358768_write(priv, TC358768_THS_HEADERCNT, val);
761
762 /* TWAKEUP > 1ms in lptxcnt steps */
763 val = tc358768_ns_to_cnt(1020000, dsibclk_nsk);
764 val = val / (lptxcnt + 1) - 1;
765 dev_dbg(priv->dev, "TWAKEUP: 0x%x\n", val);
766 tc358768_write(priv, TC358768_TWAKEUP, val);
767
768 /* TCLK_POSTCNT > 60ns + 52*UI */
769 val = tc358768_ns_to_cnt(60 + tc358768_to_ns(52 * ui_nsk),
770 dsibclk_nsk) - 3;
771 dev_dbg(priv->dev, "TCLK_POSTCNT: 0x%x\n", val);
772 tc358768_write(priv, TC358768_TCLK_POSTCNT, val);
773
774 /* 60ns + 4*UI < THS_PREPARE < 105ns + 12*UI */
775 val = tc358768_ns_to_cnt(60 + tc358768_to_ns(15 * ui_nsk),
776 dsibclk_nsk) - 5;
777 dev_dbg(priv->dev, "THS_TRAILCNT: 0x%x\n", val);
778 tc358768_write(priv, TC358768_THS_TRAILCNT, val);
779
780 val = BIT(0);
781 for (i = 0; i < dsi_dev->lanes; i++)
782 val |= BIT(i + 1);
783 tc358768_write(priv, TC358768_HSTXVREGEN, val);
784
785 if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
786 tc358768_write(priv, TC358768_TXOPTIONCNTRL, 0x1);
787
788 /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
789 val = tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk * 4);
790 val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1;
791 val2 = tc358768_ns_to_cnt(tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk),
792 dsibclk_nsk) - 2;
793 val = val << 16 | val2;
794 dev_dbg(priv->dev, "BTACNTRL1: 0x%x\n", val);
795 tc358768_write(priv, TC358768_BTACNTRL1, val);
796
797 /* START[0] */
798 tc358768_write(priv, TC358768_STARTCNTRL, 1);
799
800 if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
801 /* Set pulse mode */
802 tc358768_write(priv, TC358768_DSI_EVENT, 0);
803
804 /* vact */
805 tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
806
807 /* vsw */
808 tc358768_write(priv, TC358768_DSI_VSW,
809 mode->vsync_end - mode->vsync_start);
810 /* vbp */
811 tc358768_write(priv, TC358768_DSI_VBPR,
812 mode->vtotal - mode->vsync_end);
813
814 /* hsw * byteclk * ndl / pclk */
815 val = (u32)div_u64((mode->hsync_end - mode->hsync_start) *
816 ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
817 mode->clock * 1000);
818 tc358768_write(priv, TC358768_DSI_HSW, val);
819
820 /* hbp * byteclk * ndl / pclk */
821 val = (u32)div_u64((mode->htotal - mode->hsync_end) *
822 ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
823 mode->clock * 1000);
824 tc358768_write(priv, TC358768_DSI_HBPR, val);
825 } else {
826 /* Set event mode */
827 tc358768_write(priv, TC358768_DSI_EVENT, 1);
828
829 /* vact */
830 tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
831
832 /* vsw (+ vbp) */
833 tc358768_write(priv, TC358768_DSI_VSW,
834 mode->vtotal - mode->vsync_start);
835 /* vbp (not used in event mode) */
836 tc358768_write(priv, TC358768_DSI_VBPR, 0);
837
838 /* (hsw + hbp) * byteclk * ndl / pclk */
839 val = (u32)div_u64((mode->htotal - mode->hsync_start) *
840 ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
841 mode->clock * 1000);
842 tc358768_write(priv, TC358768_DSI_HSW, val);
843
844 /* hbp (not used in event mode) */
845 tc358768_write(priv, TC358768_DSI_HBPR, 0);
846 }
847
848 /* hact (bytes) */
849 tc358768_write(priv, TC358768_DSI_HACT, hact);
850
851 /* VSYNC polarity */
852 if (!(mode->flags & DRM_MODE_FLAG_NVSYNC))
853 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5), BIT(5));
854 /* HSYNC polarity */
855 if (mode->flags & DRM_MODE_FLAG_PHSYNC)
856 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0), BIT(0));
857
858 /* Start DSI Tx */
859 tc358768_write(priv, TC358768_DSI_START, 0x1);
860
861 /* Configure DSI_Control register */
862 val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
863 val |= TC358768_DSI_CONTROL_TXMD | TC358768_DSI_CONTROL_HSCKMD |
864 0x3 << 1 | TC358768_DSI_CONTROL_EOTDIS;
865 tc358768_write(priv, TC358768_DSI_CONFW, val);
866
867 val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
868 val |= (dsi_dev->lanes - 1) << 1;
869
870 if (!(dsi_dev->mode_flags & MIPI_DSI_MODE_LPM))
871 val |= TC358768_DSI_CONTROL_TXMD;
872
873 if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
874 val |= TC358768_DSI_CONTROL_HSCKMD;
875
876 if (dsi_dev->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET)
877 val |= TC358768_DSI_CONTROL_EOTDIS;
878
879 tc358768_write(priv, TC358768_DSI_CONFW, val);
880
881 val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
882 val |= TC358768_DSI_CONTROL_DIS_MODE; /* DSI mode */
883 tc358768_write(priv, TC358768_DSI_CONFW, val);
884
885 ret = tc358768_clear_error(priv);
886 if (ret) {
887 dev_err(priv->dev, "Bridge pre_enable failed: %d\n", ret);
888 tc358768_bridge_disable(bridge);
889 tc358768_bridge_post_disable(bridge);
890 }
891}
892
893static void tc358768_bridge_enable(struct drm_bridge *bridge)
894{
895 struct tc358768_priv *priv = bridge_to_tc358768(bridge);
896 int ret;
897
898 if (!priv->enabled) {
899 dev_err(priv->dev, "Bridge is not enabled\n");
900 return;
901 }
902
903 /* clear FrmStop and RstPtr */
904 tc358768_update_bits(priv, TC358768_PP_MISC, 0x3 << 14, 0);
905
906 /* set PP_en */
907 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), BIT(6));
908
909 ret = tc358768_clear_error(priv);
910 if (ret) {
911 dev_err(priv->dev, "Bridge enable failed: %d\n", ret);
912 tc358768_bridge_disable(bridge);
913 tc358768_bridge_post_disable(bridge);
914 }
915}
916
917static const struct drm_bridge_funcs tc358768_bridge_funcs = {
918 .attach = tc358768_bridge_attach,
919 .mode_valid = tc358768_bridge_mode_valid,
920 .pre_enable = tc358768_bridge_pre_enable,
921 .enable = tc358768_bridge_enable,
922 .disable = tc358768_bridge_disable,
923 .post_disable = tc358768_bridge_post_disable,
924};
925
926static const struct drm_bridge_timings default_tc358768_timings = {
927 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
928 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
929 | DRM_BUS_FLAG_DE_HIGH,
930};
931
932static bool tc358768_is_reserved_reg(unsigned int reg)
933{
934 switch (reg) {
935 case 0x114 ... 0x13f:
936 case 0x200:
937 case 0x20c:
938 case 0x400 ... 0x408:
939 case 0x41c ... 0x42f:
940 return true;
941 default:
942 return false;
943 }
944}
945
946static bool tc358768_writeable_reg(struct device *dev, unsigned int reg)
947{
948 if (tc358768_is_reserved_reg(reg))
949 return false;
950
951 switch (reg) {
952 case TC358768_CHIPID:
953 case TC358768_FIFOSTATUS:
954 case TC358768_DSITXSTATUS ... (TC358768_DSITXSTATUS + 2):
955 case TC358768_DSI_CONTROL ... (TC358768_DSI_INT_ENA + 2):
956 case TC358768_DSICMD_RDFIFO ... (TC358768_DSI_ERR_HALT + 2):
957 return false;
958 default:
959 return true;
960 }
961}
962
963static bool tc358768_readable_reg(struct device *dev, unsigned int reg)
964{
965 if (tc358768_is_reserved_reg(reg))
966 return false;
967
968 switch (reg) {
969 case TC358768_STARTCNTRL:
970 case TC358768_DSI_CONFW ... (TC358768_DSI_CONFW + 2):
971 case TC358768_DSI_INT_CLR ... (TC358768_DSI_INT_CLR + 2):
972 case TC358768_DSI_START ... (TC358768_DSI_START + 2):
973 case TC358768_DBG_DATA:
974 return false;
975 default:
976 return true;
977 }
978}
979
980static const struct regmap_config tc358768_regmap_config = {
981 .name = "tc358768",
982 .reg_bits = 16,
983 .val_bits = 16,
984 .max_register = TC358768_DSI_HACT,
985 .cache_type = REGCACHE_NONE,
986 .writeable_reg = tc358768_writeable_reg,
987 .readable_reg = tc358768_readable_reg,
988 .reg_format_endian = REGMAP_ENDIAN_BIG,
989 .val_format_endian = REGMAP_ENDIAN_BIG,
990};
991
992static const struct i2c_device_id tc358768_i2c_ids[] = {
993 { "tc358768", 0 },
994 { "tc358778", 0 },
995 { }
996};
997MODULE_DEVICE_TABLE(i2c, tc358768_i2c_ids);
998
999static const struct of_device_id tc358768_of_ids[] = {
1000 { .compatible = "toshiba,tc358768", },
1001 { .compatible = "toshiba,tc358778", },
1002 { }
1003};
1004MODULE_DEVICE_TABLE(of, tc358768_of_ids);
1005
1006static int tc358768_get_regulators(struct tc358768_priv *priv)
1007{
1008 int i, ret;
1009
1010 for (i = 0; i < ARRAY_SIZE(priv->supplies); ++i)
1011 priv->supplies[i].supply = tc358768_supplies[i];
1012
1013 ret = devm_regulator_bulk_get(priv->dev, ARRAY_SIZE(priv->supplies),
1014 priv->supplies);
1015 if (ret < 0)
1016 dev_err(priv->dev, "failed to get regulators: %d\n", ret);
1017
1018 return ret;
1019}
1020
1021static int tc358768_i2c_probe(struct i2c_client *client,
1022 const struct i2c_device_id *id)
1023{
1024 struct tc358768_priv *priv;
1025 struct device *dev = &client->dev;
1026 struct device_node *np = dev->of_node;
1027 int ret;
1028
1029 if (!np)
1030 return -ENODEV;
1031
1032 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
1033 if (!priv)
1034 return -ENOMEM;
1035
1036 dev_set_drvdata(dev, priv);
1037 priv->dev = dev;
1038
1039 ret = tc358768_get_regulators(priv);
1040 if (ret)
1041 return ret;
1042
1043 priv->refclk = devm_clk_get(dev, "refclk");
1044 if (IS_ERR(priv->refclk))
1045 return PTR_ERR(priv->refclk);
1046
1047 /*
1048 * RESX is low active, to disable tc358768 initially (keep in reset)
1049 * the gpio line must be LOW. This is the ASSERTED state of
1050 * GPIO_ACTIVE_LOW (GPIOD_OUT_HIGH == ASSERTED).
1051 */
1052 priv->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1053 GPIOD_OUT_HIGH);
1054 if (IS_ERR(priv->reset_gpio))
1055 return PTR_ERR(priv->reset_gpio);
1056
1057 priv->regmap = devm_regmap_init_i2c(client, &tc358768_regmap_config);
1058 if (IS_ERR(priv->regmap)) {
1059 dev_err(dev, "Failed to init regmap\n");
1060 return PTR_ERR(priv->regmap);
1061 }
1062
1063 priv->dsi_host.dev = dev;
1064 priv->dsi_host.ops = &tc358768_dsi_host_ops;
1065
1066 priv->bridge.funcs = &tc358768_bridge_funcs;
1067 priv->bridge.timings = &default_tc358768_timings;
1068 priv->bridge.of_node = np;
1069
1070 i2c_set_clientdata(client, priv);
1071
1072 return mipi_dsi_host_register(&priv->dsi_host);
1073}
1074
1075static void tc358768_i2c_remove(struct i2c_client *client)
1076{
1077 struct tc358768_priv *priv = i2c_get_clientdata(client);
1078
1079 mipi_dsi_host_unregister(&priv->dsi_host);
1080}
1081
1082static struct i2c_driver tc358768_driver = {
1083 .driver = {
1084 .name = "tc358768",
1085 .of_match_table = tc358768_of_ids,
1086 },
1087 .id_table = tc358768_i2c_ids,
1088 .probe = tc358768_i2c_probe,
1089 .remove = tc358768_i2c_remove,
1090};
1091module_i2c_driver(tc358768_driver);
1092
1093MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
1094MODULE_DESCRIPTION("TC358768AXBG/TC358778XBG DSI bridge");
1095MODULE_LICENSE("GPL v2");