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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Chrontel CH7033 Video Encoder Driver
4 *
5 * Copyright (C) 2019,2020 Lubomir Rintel
6 */
7
8#include <linux/gpio/consumer.h>
9#include <linux/module.h>
10#include <linux/regmap.h>
11
12#include <drm/drm_atomic_helper.h>
13#include <drm/drm_bridge.h>
14#include <drm/drm_edid.h>
15#include <drm/drm_of.h>
16#include <drm/drm_print.h>
17#include <drm/drm_probe_helper.h>
18
19/* Page 0, Register 0x07 */
20enum {
21 DRI_PD = BIT(3),
22 IO_PD = BIT(5),
23};
24
25/* Page 0, Register 0x08 */
26enum {
27 DRI_PDDRI = GENMASK(7, 4),
28 PDDAC = GENMASK(3, 1),
29 PANEN = BIT(0),
30};
31
32/* Page 0, Register 0x09 */
33enum {
34 DPD = BIT(7),
35 GCKOFF = BIT(6),
36 TV_BP = BIT(5),
37 SCLPD = BIT(4),
38 SDPD = BIT(3),
39 VGA_PD = BIT(2),
40 HDBKPD = BIT(1),
41 HDMI_PD = BIT(0),
42};
43
44/* Page 0, Register 0x0a */
45enum {
46 MEMINIT = BIT(7),
47 MEMIDLE = BIT(6),
48 MEMPD = BIT(5),
49 STOP = BIT(4),
50 LVDS_PD = BIT(3),
51 HD_DVIB = BIT(2),
52 HDCP_PD = BIT(1),
53 MCU_PD = BIT(0),
54};
55
56/* Page 0, Register 0x18 */
57enum {
58 IDF = GENMASK(7, 4),
59 INTEN = BIT(3),
60 SWAP = GENMASK(2, 0),
61};
62
63enum {
64 BYTE_SWAP_RGB = 0,
65 BYTE_SWAP_RBG = 1,
66 BYTE_SWAP_GRB = 2,
67 BYTE_SWAP_GBR = 3,
68 BYTE_SWAP_BRG = 4,
69 BYTE_SWAP_BGR = 5,
70};
71
72/* Page 0, Register 0x19 */
73enum {
74 HPO_I = BIT(5),
75 VPO_I = BIT(4),
76 DEPO_I = BIT(3),
77 CRYS_EN = BIT(2),
78 GCLKFREQ = GENMASK(2, 0),
79};
80
81/* Page 0, Register 0x2e */
82enum {
83 HFLIP = BIT(7),
84 VFLIP = BIT(6),
85 DEPO_O = BIT(5),
86 HPO_O = BIT(4),
87 VPO_O = BIT(3),
88 TE = GENMASK(2, 0),
89};
90
91/* Page 0, Register 0x2b */
92enum {
93 SWAPS = GENMASK(7, 4),
94 VFMT = GENMASK(3, 0),
95};
96
97/* Page 0, Register 0x54 */
98enum {
99 COMP_BP = BIT(7),
100 DAC_EN_T = BIT(6),
101 HWO_HDMI_HI = GENMASK(5, 3),
102 HOO_HDMI_HI = GENMASK(2, 0),
103};
104
105/* Page 0, Register 0x57 */
106enum {
107 FLDSEN = BIT(7),
108 VWO_HDMI_HI = GENMASK(5, 3),
109 VOO_HDMI_HI = GENMASK(2, 0),
110};
111
112/* Page 0, Register 0x7e */
113enum {
114 HDMI_LVDS_SEL = BIT(7),
115 DE_GEN = BIT(6),
116 PWM_INDEX_HI = BIT(5),
117 USE_DE = BIT(4),
118 R_INT = GENMASK(3, 0),
119};
120
121/* Page 1, Register 0x07 */
122enum {
123 BPCKSEL = BIT(7),
124 DRI_CMFB_EN = BIT(6),
125 CEC_PUEN = BIT(5),
126 CEC_T = BIT(3),
127 CKINV = BIT(2),
128 CK_TVINV = BIT(1),
129 DRI_CKS2 = BIT(0),
130};
131
132/* Page 1, Register 0x08 */
133enum {
134 DACG = BIT(6),
135 DACKTST = BIT(5),
136 DEDGEB = BIT(4),
137 SYO = BIT(3),
138 DRI_IT_LVDS = GENMASK(2, 1),
139 DISPON = BIT(0),
140};
141
142/* Page 1, Register 0x0c */
143enum {
144 DRI_PLL_CP = GENMASK(7, 6),
145 DRI_PLL_DIVSEL = BIT(5),
146 DRI_PLL_N1_1 = BIT(4),
147 DRI_PLL_N1_0 = BIT(3),
148 DRI_PLL_N3_1 = BIT(2),
149 DRI_PLL_N3_0 = BIT(1),
150 DRI_PLL_CKTSTEN = BIT(0),
151};
152
153/* Page 1, Register 0x6b */
154enum {
155 VCO3CS = GENMASK(7, 6),
156 ICPGBK2_0 = GENMASK(5, 3),
157 DRI_VCO357SC = BIT(2),
158 PDPLL2 = BIT(1),
159 DRI_PD_SER = BIT(0),
160};
161
162/* Page 1, Register 0x6c */
163enum {
164 PLL2N11 = GENMASK(7, 4),
165 PLL2N5_4 = BIT(3),
166 PLL2N5_TOP = BIT(2),
167 DRI_PLL_PD = BIT(1),
168 PD_I2CM = BIT(0),
169};
170
171/* Page 3, Register 0x28 */
172enum {
173 DIFF_EN = GENMASK(7, 6),
174 CORREC_EN = GENMASK(5, 4),
175 VGACLK_BP = BIT(3),
176 HM_LV_SEL = BIT(2),
177 HD_VGA_SEL = BIT(1),
178};
179
180/* Page 3, Register 0x2a */
181enum {
182 LVDSCLK_BP = BIT(7),
183 HDTVCLK_BP = BIT(6),
184 HDMICLK_BP = BIT(5),
185 HDTV_BP = BIT(4),
186 HDMI_BP = BIT(3),
187 THRWL = GENMASK(2, 0),
188};
189
190/* Page 4, Register 0x52 */
191enum {
192 PGM_ARSTB = BIT(7),
193 MCU_ARSTB = BIT(6),
194 MCU_RETB = BIT(2),
195 RESETIB = BIT(1),
196 RESETDB = BIT(0),
197};
198
199struct ch7033_priv {
200 struct regmap *regmap;
201 struct drm_bridge *next_bridge;
202 struct drm_bridge bridge;
203 struct drm_connector connector;
204};
205
206#define conn_to_ch7033_priv(x) \
207 container_of(x, struct ch7033_priv, connector)
208#define bridge_to_ch7033_priv(x) \
209 container_of(x, struct ch7033_priv, bridge)
210
211
212static enum drm_connector_status ch7033_connector_detect(
213 struct drm_connector *connector, bool force)
214{
215 struct ch7033_priv *priv = conn_to_ch7033_priv(connector);
216
217 return drm_bridge_detect(priv->next_bridge);
218}
219
220static const struct drm_connector_funcs ch7033_connector_funcs = {
221 .reset = drm_atomic_helper_connector_reset,
222 .fill_modes = drm_helper_probe_single_connector_modes,
223 .detect = ch7033_connector_detect,
224 .destroy = drm_connector_cleanup,
225 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
226 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
227};
228
229static int ch7033_connector_get_modes(struct drm_connector *connector)
230{
231 struct ch7033_priv *priv = conn_to_ch7033_priv(connector);
232 struct edid *edid;
233 int ret;
234
235 edid = drm_bridge_get_edid(priv->next_bridge, connector);
236 drm_connector_update_edid_property(connector, edid);
237 if (edid) {
238 ret = drm_add_edid_modes(connector, edid);
239 kfree(edid);
240 } else {
241 ret = drm_add_modes_noedid(connector, 1920, 1080);
242 drm_set_preferred_mode(connector, 1024, 768);
243 }
244
245 return ret;
246}
247
248static struct drm_encoder *ch7033_connector_best_encoder(
249 struct drm_connector *connector)
250{
251 struct ch7033_priv *priv = conn_to_ch7033_priv(connector);
252
253 return priv->bridge.encoder;
254}
255
256static const struct drm_connector_helper_funcs ch7033_connector_helper_funcs = {
257 .get_modes = ch7033_connector_get_modes,
258 .best_encoder = ch7033_connector_best_encoder,
259};
260
261static void ch7033_hpd_event(void *arg, enum drm_connector_status status)
262{
263 struct ch7033_priv *priv = arg;
264
265 if (priv->bridge.dev)
266 drm_helper_hpd_irq_event(priv->connector.dev);
267}
268
269static int ch7033_bridge_attach(struct drm_bridge *bridge,
270 enum drm_bridge_attach_flags flags)
271{
272 struct ch7033_priv *priv = bridge_to_ch7033_priv(bridge);
273 struct drm_connector *connector = &priv->connector;
274 int ret;
275
276 ret = drm_bridge_attach(bridge->encoder, priv->next_bridge, bridge,
277 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
278 if (ret)
279 return ret;
280
281 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
282 return 0;
283
284 if (priv->next_bridge->ops & DRM_BRIDGE_OP_DETECT) {
285 connector->polled = DRM_CONNECTOR_POLL_HPD;
286 } else {
287 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
288 DRM_CONNECTOR_POLL_DISCONNECT;
289 }
290
291 if (priv->next_bridge->ops & DRM_BRIDGE_OP_HPD) {
292 drm_bridge_hpd_enable(priv->next_bridge, ch7033_hpd_event,
293 priv);
294 }
295
296 drm_connector_helper_add(connector,
297 &ch7033_connector_helper_funcs);
298 ret = drm_connector_init_with_ddc(bridge->dev, &priv->connector,
299 &ch7033_connector_funcs,
300 priv->next_bridge->type,
301 priv->next_bridge->ddc);
302 if (ret) {
303 DRM_ERROR("Failed to initialize connector\n");
304 return ret;
305 }
306
307 return drm_connector_attach_encoder(&priv->connector, bridge->encoder);
308}
309
310static void ch7033_bridge_detach(struct drm_bridge *bridge)
311{
312 struct ch7033_priv *priv = bridge_to_ch7033_priv(bridge);
313
314 if (priv->next_bridge->ops & DRM_BRIDGE_OP_HPD)
315 drm_bridge_hpd_disable(priv->next_bridge);
316 drm_connector_cleanup(&priv->connector);
317}
318
319static enum drm_mode_status ch7033_bridge_mode_valid(struct drm_bridge *bridge,
320 const struct drm_display_info *info,
321 const struct drm_display_mode *mode)
322{
323 if (mode->clock > 165000)
324 return MODE_CLOCK_HIGH;
325 if (mode->hdisplay >= 1920)
326 return MODE_BAD_HVALUE;
327 if (mode->vdisplay >= 1080)
328 return MODE_BAD_VVALUE;
329 return MODE_OK;
330}
331
332static void ch7033_bridge_disable(struct drm_bridge *bridge)
333{
334 struct ch7033_priv *priv = bridge_to_ch7033_priv(bridge);
335
336 regmap_write(priv->regmap, 0x03, 0x04);
337 regmap_update_bits(priv->regmap, 0x52, RESETDB, 0x00);
338}
339
340static void ch7033_bridge_enable(struct drm_bridge *bridge)
341{
342 struct ch7033_priv *priv = bridge_to_ch7033_priv(bridge);
343
344 regmap_write(priv->regmap, 0x03, 0x04);
345 regmap_update_bits(priv->regmap, 0x52, RESETDB, RESETDB);
346}
347
348static void ch7033_bridge_mode_set(struct drm_bridge *bridge,
349 const struct drm_display_mode *mode,
350 const struct drm_display_mode *adjusted_mode)
351{
352 struct ch7033_priv *priv = bridge_to_ch7033_priv(bridge);
353 int hbporch = mode->hsync_start - mode->hdisplay;
354 int hsynclen = mode->hsync_end - mode->hsync_start;
355 int vbporch = mode->vsync_start - mode->vdisplay;
356 int vsynclen = mode->vsync_end - mode->vsync_start;
357
358 /*
359 * Page 4
360 */
361 regmap_write(priv->regmap, 0x03, 0x04);
362
363 /* Turn everything off to set all the registers to their defaults. */
364 regmap_write(priv->regmap, 0x52, 0x00);
365 /* Bring I/O block up. */
366 regmap_write(priv->regmap, 0x52, RESETIB);
367
368 /*
369 * Page 0
370 */
371 regmap_write(priv->regmap, 0x03, 0x00);
372
373 /* Bring up parts we need from the power down. */
374 regmap_update_bits(priv->regmap, 0x07, DRI_PD | IO_PD, 0);
375 regmap_update_bits(priv->regmap, 0x08, DRI_PDDRI | PDDAC | PANEN, 0);
376 regmap_update_bits(priv->regmap, 0x09, DPD | GCKOFF |
377 HDMI_PD | VGA_PD, 0);
378 regmap_update_bits(priv->regmap, 0x0a, HD_DVIB, 0);
379
380 /* Horizontal input timing. */
381 regmap_write(priv->regmap, 0x0b, (mode->htotal >> 8) << 3 |
382 (mode->hdisplay >> 8));
383 regmap_write(priv->regmap, 0x0c, mode->hdisplay);
384 regmap_write(priv->regmap, 0x0d, mode->htotal);
385 regmap_write(priv->regmap, 0x0e, (hsynclen >> 8) << 3 |
386 (hbporch >> 8));
387 regmap_write(priv->regmap, 0x0f, hbporch);
388 regmap_write(priv->regmap, 0x10, hsynclen);
389
390 /* Vertical input timing. */
391 regmap_write(priv->regmap, 0x11, (mode->vtotal >> 8) << 3 |
392 (mode->vdisplay >> 8));
393 regmap_write(priv->regmap, 0x12, mode->vdisplay);
394 regmap_write(priv->regmap, 0x13, mode->vtotal);
395 regmap_write(priv->regmap, 0x14, ((vsynclen >> 8) << 3) |
396 (vbporch >> 8));
397 regmap_write(priv->regmap, 0x15, vbporch);
398 regmap_write(priv->regmap, 0x16, vsynclen);
399
400 /* Input color swap. */
401 regmap_update_bits(priv->regmap, 0x18, SWAP, BYTE_SWAP_BGR);
402
403 /* Input clock and sync polarity. */
404 regmap_update_bits(priv->regmap, 0x19, 0x1, mode->clock >> 16);
405 regmap_update_bits(priv->regmap, 0x19, HPO_I | VPO_I | GCLKFREQ,
406 (mode->flags & DRM_MODE_FLAG_PHSYNC) ? HPO_I : 0 |
407 (mode->flags & DRM_MODE_FLAG_PVSYNC) ? VPO_I : 0 |
408 mode->clock >> 16);
409 regmap_write(priv->regmap, 0x1a, mode->clock >> 8);
410 regmap_write(priv->regmap, 0x1b, mode->clock);
411
412 /* Horizontal output timing. */
413 regmap_write(priv->regmap, 0x1f, (mode->htotal >> 8) << 3 |
414 (mode->hdisplay >> 8));
415 regmap_write(priv->regmap, 0x20, mode->hdisplay);
416 regmap_write(priv->regmap, 0x21, mode->htotal);
417
418 /* Vertical output timing. */
419 regmap_write(priv->regmap, 0x25, (mode->vtotal >> 8) << 3 |
420 (mode->vdisplay >> 8));
421 regmap_write(priv->regmap, 0x26, mode->vdisplay);
422 regmap_write(priv->regmap, 0x27, mode->vtotal);
423
424 /* VGA channel bypass */
425 regmap_update_bits(priv->regmap, 0x2b, VFMT, 9);
426
427 /* Output sync polarity. */
428 regmap_update_bits(priv->regmap, 0x2e, HPO_O | VPO_O,
429 (mode->flags & DRM_MODE_FLAG_PHSYNC) ? HPO_O : 0 |
430 (mode->flags & DRM_MODE_FLAG_PVSYNC) ? VPO_O : 0);
431
432 /* HDMI horizontal output timing. */
433 regmap_update_bits(priv->regmap, 0x54, HWO_HDMI_HI | HOO_HDMI_HI,
434 (hsynclen >> 8) << 3 |
435 (hbporch >> 8));
436 regmap_write(priv->regmap, 0x55, hbporch);
437 regmap_write(priv->regmap, 0x56, hsynclen);
438
439 /* HDMI vertical output timing. */
440 regmap_update_bits(priv->regmap, 0x57, VWO_HDMI_HI | VOO_HDMI_HI,
441 (vsynclen >> 8) << 3 |
442 (vbporch >> 8));
443 regmap_write(priv->regmap, 0x58, vbporch);
444 regmap_write(priv->regmap, 0x59, vsynclen);
445
446 /* Pick HDMI, not LVDS. */
447 regmap_update_bits(priv->regmap, 0x7e, HDMI_LVDS_SEL, HDMI_LVDS_SEL);
448
449 /*
450 * Page 1
451 */
452 regmap_write(priv->regmap, 0x03, 0x01);
453
454 /* No idea what these do, but VGA is wobbly and blinky without them. */
455 regmap_update_bits(priv->regmap, 0x07, CKINV, CKINV);
456 regmap_update_bits(priv->regmap, 0x08, DISPON, DISPON);
457
458 /* DRI PLL */
459 regmap_update_bits(priv->regmap, 0x0c, DRI_PLL_DIVSEL, DRI_PLL_DIVSEL);
460 if (mode->clock <= 40000) {
461 regmap_update_bits(priv->regmap, 0x0c, DRI_PLL_N1_1 |
462 DRI_PLL_N1_0 |
463 DRI_PLL_N3_1 |
464 DRI_PLL_N3_0,
465 0);
466 } else if (mode->clock < 80000) {
467 regmap_update_bits(priv->regmap, 0x0c, DRI_PLL_N1_1 |
468 DRI_PLL_N1_0 |
469 DRI_PLL_N3_1 |
470 DRI_PLL_N3_0,
471 DRI_PLL_N3_0 |
472 DRI_PLL_N1_0);
473 } else {
474 regmap_update_bits(priv->regmap, 0x0c, DRI_PLL_N1_1 |
475 DRI_PLL_N1_0 |
476 DRI_PLL_N3_1 |
477 DRI_PLL_N3_0,
478 DRI_PLL_N3_1 |
479 DRI_PLL_N1_1);
480 }
481
482 /* This seems to be color calibration for VGA. */
483 regmap_write(priv->regmap, 0x64, 0x29); /* LSB Blue */
484 regmap_write(priv->regmap, 0x65, 0x29); /* LSB Green */
485 regmap_write(priv->regmap, 0x66, 0x29); /* LSB Red */
486 regmap_write(priv->regmap, 0x67, 0x00); /* MSB Blue */
487 regmap_write(priv->regmap, 0x68, 0x00); /* MSB Green */
488 regmap_write(priv->regmap, 0x69, 0x00); /* MSB Red */
489
490 regmap_update_bits(priv->regmap, 0x6b, DRI_PD_SER, 0x00);
491 regmap_update_bits(priv->regmap, 0x6c, DRI_PLL_PD, 0x00);
492
493 /*
494 * Page 3
495 */
496 regmap_write(priv->regmap, 0x03, 0x03);
497
498 /* More bypasses and apparently another HDMI/LVDS selector. */
499 regmap_update_bits(priv->regmap, 0x28, VGACLK_BP | HM_LV_SEL,
500 VGACLK_BP | HM_LV_SEL);
501 regmap_update_bits(priv->regmap, 0x2a, HDMICLK_BP | HDMI_BP,
502 HDMICLK_BP | HDMI_BP);
503
504 /*
505 * Page 4
506 */
507 regmap_write(priv->regmap, 0x03, 0x04);
508
509 /* Output clock. */
510 regmap_write(priv->regmap, 0x10, mode->clock >> 16);
511 regmap_write(priv->regmap, 0x11, mode->clock >> 8);
512 regmap_write(priv->regmap, 0x12, mode->clock);
513}
514
515static const struct drm_bridge_funcs ch7033_bridge_funcs = {
516 .attach = ch7033_bridge_attach,
517 .detach = ch7033_bridge_detach,
518 .mode_valid = ch7033_bridge_mode_valid,
519 .disable = ch7033_bridge_disable,
520 .enable = ch7033_bridge_enable,
521 .mode_set = ch7033_bridge_mode_set,
522};
523
524static const struct regmap_config ch7033_regmap_config = {
525 .reg_bits = 8,
526 .val_bits = 8,
527 .max_register = 0x7f,
528};
529
530static int ch7033_probe(struct i2c_client *client,
531 const struct i2c_device_id *id)
532{
533 struct device *dev = &client->dev;
534 struct ch7033_priv *priv;
535 unsigned int val;
536 int ret;
537
538 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
539 if (!priv)
540 return -ENOMEM;
541
542 dev_set_drvdata(dev, priv);
543
544 ret = drm_of_find_panel_or_bridge(dev->of_node, 1, -1, NULL,
545 &priv->next_bridge);
546 if (ret)
547 return ret;
548
549 priv->regmap = devm_regmap_init_i2c(client, &ch7033_regmap_config);
550 if (IS_ERR(priv->regmap)) {
551 dev_err(&client->dev, "regmap init failed\n");
552 return PTR_ERR(priv->regmap);
553 }
554
555 ret = regmap_read(priv->regmap, 0x00, &val);
556 if (ret < 0) {
557 dev_err(&client->dev, "error reading the model id: %d\n", ret);
558 return ret;
559 }
560 if ((val & 0xf7) != 0x56) {
561 dev_err(&client->dev, "the device is not a ch7033\n");
562 return -ENODEV;
563 }
564
565 regmap_write(priv->regmap, 0x03, 0x04);
566 ret = regmap_read(priv->regmap, 0x51, &val);
567 if (ret < 0) {
568 dev_err(&client->dev, "error reading the model id: %d\n", ret);
569 return ret;
570 }
571 if ((val & 0x0f) != 3) {
572 dev_err(&client->dev, "unknown revision %u\n", val);
573 return -ENODEV;
574 }
575
576 INIT_LIST_HEAD(&priv->bridge.list);
577 priv->bridge.funcs = &ch7033_bridge_funcs;
578 priv->bridge.of_node = dev->of_node;
579 drm_bridge_add(&priv->bridge);
580
581 dev_info(dev, "Chrontel CH7033 Video Encoder\n");
582 return 0;
583}
584
585static int ch7033_remove(struct i2c_client *client)
586{
587 struct device *dev = &client->dev;
588 struct ch7033_priv *priv = dev_get_drvdata(dev);
589
590 drm_bridge_remove(&priv->bridge);
591
592 return 0;
593}
594
595static const struct of_device_id ch7033_dt_ids[] = {
596 { .compatible = "chrontel,ch7033", },
597 { }
598};
599MODULE_DEVICE_TABLE(of, ch7033_dt_ids);
600
601static const struct i2c_device_id ch7033_ids[] = {
602 { "ch7033", 0 },
603 { }
604};
605MODULE_DEVICE_TABLE(i2c, ch7033_ids);
606
607static struct i2c_driver ch7033_driver = {
608 .probe = ch7033_probe,
609 .remove = ch7033_remove,
610 .driver = {
611 .name = "ch7033",
612 .of_match_table = of_match_ptr(ch7033_dt_ids),
613 },
614 .id_table = ch7033_ids,
615};
616
617module_i2c_driver(ch7033_driver);
618
619MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
620MODULE_DESCRIPTION("Chrontel CH7033 Video Encoder Driver");
621MODULE_LICENSE("GPL v2");