1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
4  */
5 
6 #include <linux/delay.h>
7 #include <linux/gpio/consumer.h>
8 #include <linux/module.h>
9 #include <linux/of.h>
10 #include <linux/of_device.h>
11 #include <linux/regulator/consumer.h>
12 
13 #include <video/mipi_display.h>
14 
15 #include <drm/drm_crtc.h>
16 #include <drm/drm_device.h>
17 #include <drm/drm_mipi_dsi.h>
18 #include <drm/drm_modes.h>
19 #include <drm/drm_panel.h>
20 
21 struct panel_init_cmd {
22 	size_t len;
23 	const char *data;
24 };
25 
26 #define _INIT_CMD(...) { \
27 	.len = sizeof((char[]){__VA_ARGS__}), \
28 	.data = (char[]){__VA_ARGS__} }
29 
30 struct panel_desc {
31 	const struct drm_display_mode *mode;
32 	unsigned int bpc;
33 	struct {
34 		unsigned int width;
35 		unsigned int height;
36 	} size;
37 
38 	unsigned long flags;
39 	enum mipi_dsi_pixel_format format;
40 	const struct panel_init_cmd *init_cmds;
41 	unsigned int lanes;
42 	const char * const *supply_names;
43 	unsigned int num_supplies;
44 	unsigned int sleep_mode_delay;
45 	unsigned int power_down_delay;
46 };
47 
48 struct innolux_panel {
49 	struct drm_panel base;
50 	struct mipi_dsi_device *link;
51 	const struct panel_desc *desc;
52 
53 	struct regulator_bulk_data *supplies;
54 	struct gpio_desc *enable_gpio;
55 
56 	bool prepared;
57 	bool enabled;
58 };
59 
60 static inline struct innolux_panel *to_innolux_panel(struct drm_panel *panel)
61 {
62 	return container_of(panel, struct innolux_panel, base);
63 }
64 
65 static int innolux_panel_disable(struct drm_panel *panel)
66 {
67 	struct innolux_panel *innolux = to_innolux_panel(panel);
68 
69 	if (!innolux->enabled)
70 		return 0;
71 
72 	innolux->enabled = false;
73 
74 	return 0;
75 }
76 
77 static int innolux_panel_unprepare(struct drm_panel *panel)
78 {
79 	struct innolux_panel *innolux = to_innolux_panel(panel);
80 	int err;
81 
82 	if (!innolux->prepared)
83 		return 0;
84 
85 	err = mipi_dsi_dcs_set_display_off(innolux->link);
86 	if (err < 0)
87 		dev_err(panel->dev, "failed to set display off: %d\n", err);
88 
89 	err = mipi_dsi_dcs_enter_sleep_mode(innolux->link);
90 	if (err < 0) {
91 		dev_err(panel->dev, "failed to enter sleep mode: %d\n", err);
92 		return err;
93 	}
94 
95 	if (innolux->desc->sleep_mode_delay)
96 		msleep(innolux->desc->sleep_mode_delay);
97 
98 	gpiod_set_value_cansleep(innolux->enable_gpio, 0);
99 
100 	if (innolux->desc->power_down_delay)
101 		msleep(innolux->desc->power_down_delay);
102 
103 	err = regulator_bulk_disable(innolux->desc->num_supplies,
104 				     innolux->supplies);
105 	if (err < 0)
106 		return err;
107 
108 	innolux->prepared = false;
109 
110 	return 0;
111 }
112 
113 static int innolux_panel_prepare(struct drm_panel *panel)
114 {
115 	struct innolux_panel *innolux = to_innolux_panel(panel);
116 	int err;
117 
118 	if (innolux->prepared)
119 		return 0;
120 
121 	gpiod_set_value_cansleep(innolux->enable_gpio, 0);
122 
123 	err = regulator_bulk_enable(innolux->desc->num_supplies,
124 				    innolux->supplies);
125 	if (err < 0)
126 		return err;
127 
128 	/* p079zca: t2 (20ms), p097pfg: t4 (15ms) */
129 	usleep_range(20000, 21000);
130 
131 	gpiod_set_value_cansleep(innolux->enable_gpio, 1);
132 
133 	/* p079zca: t4, p097pfg: t5 */
134 	usleep_range(20000, 21000);
135 
136 	if (innolux->desc->init_cmds) {
137 		const struct panel_init_cmd *cmds =
138 					innolux->desc->init_cmds;
139 		unsigned int i;
140 
141 		for (i = 0; cmds[i].len != 0; i++) {
142 			const struct panel_init_cmd *cmd = &cmds[i];
143 
144 			err = mipi_dsi_generic_write(innolux->link, cmd->data,
145 						     cmd->len);
146 			if (err < 0) {
147 				dev_err(panel->dev, "failed to write command %u\n", i);
148 				goto poweroff;
149 			}
150 
151 			/*
152 			 * Included by random guessing, because without this
153 			 * (or at least, some delay), the panel sometimes
154 			 * didn't appear to pick up the command sequence.
155 			 */
156 			err = mipi_dsi_dcs_nop(innolux->link);
157 			if (err < 0) {
158 				dev_err(panel->dev, "failed to send DCS nop: %d\n", err);
159 				goto poweroff;
160 			}
161 		}
162 	}
163 
164 	err = mipi_dsi_dcs_exit_sleep_mode(innolux->link);
165 	if (err < 0) {
166 		dev_err(panel->dev, "failed to exit sleep mode: %d\n", err);
167 		goto poweroff;
168 	}
169 
170 	/* T6: 120ms - 1000ms*/
171 	msleep(120);
172 
173 	err = mipi_dsi_dcs_set_display_on(innolux->link);
174 	if (err < 0) {
175 		dev_err(panel->dev, "failed to set display on: %d\n", err);
176 		goto poweroff;
177 	}
178 
179 	/* T7: 5ms */
180 	usleep_range(5000, 6000);
181 
182 	innolux->prepared = true;
183 
184 	return 0;
185 
186 poweroff:
187 	gpiod_set_value_cansleep(innolux->enable_gpio, 0);
188 	regulator_bulk_disable(innolux->desc->num_supplies, innolux->supplies);
189 
190 	return err;
191 }
192 
193 static int innolux_panel_enable(struct drm_panel *panel)
194 {
195 	struct innolux_panel *innolux = to_innolux_panel(panel);
196 
197 	if (innolux->enabled)
198 		return 0;
199 
200 	innolux->enabled = true;
201 
202 	return 0;
203 }
204 
205 static const char * const innolux_p079zca_supply_names[] = {
206 	"power",
207 };
208 
209 static const struct drm_display_mode innolux_p079zca_mode = {
210 	.clock = 56900,
211 	.hdisplay = 768,
212 	.hsync_start = 768 + 40,
213 	.hsync_end = 768 + 40 + 40,
214 	.htotal = 768 + 40 + 40 + 40,
215 	.vdisplay = 1024,
216 	.vsync_start = 1024 + 20,
217 	.vsync_end = 1024 + 20 + 4,
218 	.vtotal = 1024 + 20 + 4 + 20,
219 };
220 
221 static const struct panel_desc innolux_p079zca_panel_desc = {
222 	.mode = &innolux_p079zca_mode,
223 	.bpc = 8,
224 	.size = {
225 		.width = 120,
226 		.height = 160,
227 	},
228 	.flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
229 		 MIPI_DSI_MODE_LPM,
230 	.format = MIPI_DSI_FMT_RGB888,
231 	.lanes = 4,
232 	.supply_names = innolux_p079zca_supply_names,
233 	.num_supplies = ARRAY_SIZE(innolux_p079zca_supply_names),
234 	.power_down_delay = 80, /* T8: 80ms - 1000ms */
235 };
236 
237 static const char * const innolux_p097pfg_supply_names[] = {
238 	"avdd",
239 	"avee",
240 };
241 
242 static const struct drm_display_mode innolux_p097pfg_mode = {
243 	.clock = 229000,
244 	.hdisplay = 1536,
245 	.hsync_start = 1536 + 100,
246 	.hsync_end = 1536 + 100 + 24,
247 	.htotal = 1536 + 100 + 24 + 100,
248 	.vdisplay = 2048,
249 	.vsync_start = 2048 + 100,
250 	.vsync_end = 2048 + 100 + 2,
251 	.vtotal = 2048 + 100 + 2 + 18,
252 };
253 
254 /*
255  * Display manufacturer failed to provide init sequencing according to
256  * https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/+/892065/
257  * so the init sequence stems from a register dump of a working panel.
258  */
259 static const struct panel_init_cmd innolux_p097pfg_init_cmds[] = {
260 	/* page 0 */
261 	_INIT_CMD(0xF0, 0x55, 0xAA, 0x52, 0x08, 0x00),
262 	_INIT_CMD(0xB1, 0xE8, 0x11),
263 	_INIT_CMD(0xB2, 0x25, 0x02),
264 	_INIT_CMD(0xB5, 0x08, 0x00),
265 	_INIT_CMD(0xBC, 0x0F, 0x00),
266 	_INIT_CMD(0xB8, 0x03, 0x06, 0x00, 0x00),
267 	_INIT_CMD(0xBD, 0x01, 0x90, 0x14, 0x14),
268 	_INIT_CMD(0x6F, 0x01),
269 	_INIT_CMD(0xC0, 0x03),
270 	_INIT_CMD(0x6F, 0x02),
271 	_INIT_CMD(0xC1, 0x0D),
272 	_INIT_CMD(0xD9, 0x01, 0x09, 0x70),
273 	_INIT_CMD(0xC5, 0x12, 0x21, 0x00),
274 	_INIT_CMD(0xBB, 0x93, 0x93),
275 
276 	/* page 1 */
277 	_INIT_CMD(0xF0, 0x55, 0xAA, 0x52, 0x08, 0x01),
278 	_INIT_CMD(0xB3, 0x3C, 0x3C),
279 	_INIT_CMD(0xB4, 0x0F, 0x0F),
280 	_INIT_CMD(0xB9, 0x45, 0x45),
281 	_INIT_CMD(0xBA, 0x14, 0x14),
282 	_INIT_CMD(0xCA, 0x02),
283 	_INIT_CMD(0xCE, 0x04),
284 	_INIT_CMD(0xC3, 0x9B, 0x9B),
285 	_INIT_CMD(0xD8, 0xC0, 0x03),
286 	_INIT_CMD(0xBC, 0x82, 0x01),
287 	_INIT_CMD(0xBD, 0x9E, 0x01),
288 
289 	/* page 2 */
290 	_INIT_CMD(0xF0, 0x55, 0xAA, 0x52, 0x08, 0x02),
291 	_INIT_CMD(0xB0, 0x82),
292 	_INIT_CMD(0xD1, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x82, 0x00, 0xA5,
293 		  0x00, 0xC1, 0x00, 0xEA, 0x01, 0x0D, 0x01, 0x40),
294 	_INIT_CMD(0xD2, 0x01, 0x6A, 0x01, 0xA8, 0x01, 0xDC, 0x02, 0x29,
295 		  0x02, 0x67, 0x02, 0x68, 0x02, 0xA8, 0x02, 0xF0),
296 	_INIT_CMD(0xD3, 0x03, 0x19, 0x03, 0x49, 0x03, 0x67, 0x03, 0x8C,
297 		  0x03, 0xA6, 0x03, 0xC7, 0x03, 0xDE, 0x03, 0xEC),
298 	_INIT_CMD(0xD4, 0x03, 0xFF, 0x03, 0xFF),
299 	_INIT_CMD(0xE0, 0x00, 0x00, 0x00, 0x86, 0x00, 0xC5, 0x00, 0xE5,
300 		  0x00, 0xFF, 0x01, 0x26, 0x01, 0x45, 0x01, 0x75),
301 	_INIT_CMD(0xE1, 0x01, 0x9C, 0x01, 0xD5, 0x02, 0x05, 0x02, 0x4D,
302 		  0x02, 0x86, 0x02, 0x87, 0x02, 0xC3, 0x03, 0x03),
303 	_INIT_CMD(0xE2, 0x03, 0x2A, 0x03, 0x56, 0x03, 0x72, 0x03, 0x94,
304 		  0x03, 0xAC, 0x03, 0xCB, 0x03, 0xE0, 0x03, 0xED),
305 	_INIT_CMD(0xE3, 0x03, 0xFF, 0x03, 0xFF),
306 
307 	/* page 3 */
308 	_INIT_CMD(0xF0, 0x55, 0xAA, 0x52, 0x08, 0x03),
309 	_INIT_CMD(0xB0, 0x00, 0x00, 0x00, 0x00),
310 	_INIT_CMD(0xB1, 0x00, 0x00, 0x00, 0x00),
311 	_INIT_CMD(0xB2, 0x00, 0x00, 0x06, 0x04, 0x01, 0x40, 0x85),
312 	_INIT_CMD(0xB3, 0x10, 0x07, 0xFC, 0x04, 0x01, 0x40, 0x80),
313 	_INIT_CMD(0xB6, 0xF0, 0x08, 0x00, 0x04, 0x00, 0x00, 0x00, 0x01,
314 		  0x40, 0x80),
315 	_INIT_CMD(0xBA, 0xC5, 0x07, 0x00, 0x04, 0x11, 0x25, 0x8C),
316 	_INIT_CMD(0xBB, 0xC5, 0x07, 0x00, 0x03, 0x11, 0x25, 0x8C),
317 	_INIT_CMD(0xC0, 0x00, 0x3C, 0x00, 0x00, 0x00, 0x80, 0x80),
318 	_INIT_CMD(0xC1, 0x00, 0x3C, 0x00, 0x00, 0x00, 0x80, 0x80),
319 	_INIT_CMD(0xC4, 0x00, 0x00),
320 	_INIT_CMD(0xEF, 0x41),
321 
322 	/* page 4 */
323 	_INIT_CMD(0xF0, 0x55, 0xAA, 0x52, 0x08, 0x04),
324 	_INIT_CMD(0xEC, 0x4C),
325 
326 	/* page 5 */
327 	_INIT_CMD(0xF0, 0x55, 0xAA, 0x52, 0x08, 0x05),
328 	_INIT_CMD(0xB0, 0x13, 0x03, 0x03, 0x01),
329 	_INIT_CMD(0xB1, 0x30, 0x00),
330 	_INIT_CMD(0xB2, 0x02, 0x02, 0x00),
331 	_INIT_CMD(0xB3, 0x82, 0x23, 0x82, 0x9D),
332 	_INIT_CMD(0xB4, 0xC5, 0x75, 0x24, 0x57),
333 	_INIT_CMD(0xB5, 0x00, 0xD4, 0x72, 0x11, 0x11, 0xAB, 0x0A),
334 	_INIT_CMD(0xB6, 0x00, 0x00, 0xD5, 0x72, 0x24, 0x56),
335 	_INIT_CMD(0xB7, 0x5C, 0xDC, 0x5C, 0x5C),
336 	_INIT_CMD(0xB9, 0x0C, 0x00, 0x00, 0x01, 0x00),
337 	_INIT_CMD(0xC0, 0x75, 0x11, 0x11, 0x54, 0x05),
338 	_INIT_CMD(0xC6, 0x00, 0x00, 0x00, 0x00),
339 	_INIT_CMD(0xD0, 0x00, 0x48, 0x08, 0x00, 0x00),
340 	_INIT_CMD(0xD1, 0x00, 0x48, 0x09, 0x00, 0x00),
341 
342 	/* page 6 */
343 	_INIT_CMD(0xF0, 0x55, 0xAA, 0x52, 0x08, 0x06),
344 	_INIT_CMD(0xB0, 0x02, 0x32, 0x32, 0x08, 0x2F),
345 	_INIT_CMD(0xB1, 0x2E, 0x15, 0x14, 0x13, 0x12),
346 	_INIT_CMD(0xB2, 0x11, 0x10, 0x00, 0x3D, 0x3D),
347 	_INIT_CMD(0xB3, 0x3D, 0x3D, 0x3D, 0x3D, 0x3D),
348 	_INIT_CMD(0xB4, 0x3D, 0x32),
349 	_INIT_CMD(0xB5, 0x03, 0x32, 0x32, 0x09, 0x2F),
350 	_INIT_CMD(0xB6, 0x2E, 0x1B, 0x1A, 0x19, 0x18),
351 	_INIT_CMD(0xB7, 0x17, 0x16, 0x01, 0x3D, 0x3D),
352 	_INIT_CMD(0xB8, 0x3D, 0x3D, 0x3D, 0x3D, 0x3D),
353 	_INIT_CMD(0xB9, 0x3D, 0x32),
354 	_INIT_CMD(0xC0, 0x01, 0x32, 0x32, 0x09, 0x2F),
355 	_INIT_CMD(0xC1, 0x2E, 0x1A, 0x1B, 0x16, 0x17),
356 	_INIT_CMD(0xC2, 0x18, 0x19, 0x03, 0x3D, 0x3D),
357 	_INIT_CMD(0xC3, 0x3D, 0x3D, 0x3D, 0x3D, 0x3D),
358 	_INIT_CMD(0xC4, 0x3D, 0x32),
359 	_INIT_CMD(0xC5, 0x00, 0x32, 0x32, 0x08, 0x2F),
360 	_INIT_CMD(0xC6, 0x2E, 0x14, 0x15, 0x10, 0x11),
361 	_INIT_CMD(0xC7, 0x12, 0x13, 0x02, 0x3D, 0x3D),
362 	_INIT_CMD(0xC8, 0x3D, 0x3D, 0x3D, 0x3D, 0x3D),
363 	_INIT_CMD(0xC9, 0x3D, 0x32),
364 
365 	{},
366 };
367 
368 static const struct panel_desc innolux_p097pfg_panel_desc = {
369 	.mode = &innolux_p097pfg_mode,
370 	.bpc = 8,
371 	.size = {
372 		.width = 147,
373 		.height = 196,
374 	},
375 	.flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
376 		 MIPI_DSI_MODE_LPM,
377 	.format = MIPI_DSI_FMT_RGB888,
378 	.init_cmds = innolux_p097pfg_init_cmds,
379 	.lanes = 4,
380 	.supply_names = innolux_p097pfg_supply_names,
381 	.num_supplies = ARRAY_SIZE(innolux_p097pfg_supply_names),
382 	.sleep_mode_delay = 100, /* T15 */
383 };
384 
385 static int innolux_panel_get_modes(struct drm_panel *panel,
386 				   struct drm_connector *connector)
387 {
388 	struct innolux_panel *innolux = to_innolux_panel(panel);
389 	const struct drm_display_mode *m = innolux->desc->mode;
390 	struct drm_display_mode *mode;
391 
392 	mode = drm_mode_duplicate(connector->dev, m);
393 	if (!mode) {
394 		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
395 			m->hdisplay, m->vdisplay, drm_mode_vrefresh(m));
396 		return -ENOMEM;
397 	}
398 
399 	drm_mode_set_name(mode);
400 
401 	drm_mode_probed_add(connector, mode);
402 
403 	connector->display_info.width_mm = innolux->desc->size.width;
404 	connector->display_info.height_mm = innolux->desc->size.height;
405 	connector->display_info.bpc = innolux->desc->bpc;
406 
407 	return 1;
408 }
409 
410 static const struct drm_panel_funcs innolux_panel_funcs = {
411 	.disable = innolux_panel_disable,
412 	.unprepare = innolux_panel_unprepare,
413 	.prepare = innolux_panel_prepare,
414 	.enable = innolux_panel_enable,
415 	.get_modes = innolux_panel_get_modes,
416 };
417 
418 static const struct of_device_id innolux_of_match[] = {
419 	{ .compatible = "innolux,p079zca",
420 	  .data = &innolux_p079zca_panel_desc
421 	},
422 	{ .compatible = "innolux,p097pfg",
423 	  .data = &innolux_p097pfg_panel_desc
424 	},
425 	{ }
426 };
427 MODULE_DEVICE_TABLE(of, innolux_of_match);
428 
429 static int innolux_panel_add(struct mipi_dsi_device *dsi,
430 			     const struct panel_desc *desc)
431 {
432 	struct innolux_panel *innolux;
433 	struct device *dev = &dsi->dev;
434 	int err, i;
435 
436 	innolux = devm_kzalloc(dev, sizeof(*innolux), GFP_KERNEL);
437 	if (!innolux)
438 		return -ENOMEM;
439 
440 	innolux->desc = desc;
441 
442 	innolux->supplies = devm_kcalloc(dev, desc->num_supplies,
443 					 sizeof(*innolux->supplies),
444 					 GFP_KERNEL);
445 	if (!innolux->supplies)
446 		return -ENOMEM;
447 
448 	for (i = 0; i < desc->num_supplies; i++)
449 		innolux->supplies[i].supply = desc->supply_names[i];
450 
451 	err = devm_regulator_bulk_get(dev, desc->num_supplies,
452 				      innolux->supplies);
453 	if (err < 0)
454 		return err;
455 
456 	innolux->enable_gpio = devm_gpiod_get_optional(dev, "enable",
457 						       GPIOD_OUT_HIGH);
458 	if (IS_ERR(innolux->enable_gpio)) {
459 		err = PTR_ERR(innolux->enable_gpio);
460 		dev_dbg(dev, "failed to get enable gpio: %d\n", err);
461 		innolux->enable_gpio = NULL;
462 	}
463 
464 	drm_panel_init(&innolux->base, dev, &innolux_panel_funcs,
465 		       DRM_MODE_CONNECTOR_DSI);
466 
467 	err = drm_panel_of_backlight(&innolux->base);
468 	if (err)
469 		return err;
470 
471 	drm_panel_add(&innolux->base);
472 
473 	mipi_dsi_set_drvdata(dsi, innolux);
474 	innolux->link = dsi;
475 
476 	return 0;
477 }
478 
479 static void innolux_panel_del(struct innolux_panel *innolux)
480 {
481 	drm_panel_remove(&innolux->base);
482 }
483 
484 static int innolux_panel_probe(struct mipi_dsi_device *dsi)
485 {
486 	const struct panel_desc *desc;
487 	int err;
488 
489 	desc = of_device_get_match_data(&dsi->dev);
490 	dsi->mode_flags = desc->flags;
491 	dsi->format = desc->format;
492 	dsi->lanes = desc->lanes;
493 
494 	err = innolux_panel_add(dsi, desc);
495 	if (err < 0)
496 		return err;
497 
498 	return mipi_dsi_attach(dsi);
499 }
500 
501 static int innolux_panel_remove(struct mipi_dsi_device *dsi)
502 {
503 	struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
504 	int err;
505 
506 	err = drm_panel_unprepare(&innolux->base);
507 	if (err < 0)
508 		dev_err(&dsi->dev, "failed to unprepare panel: %d\n", err);
509 
510 	err = drm_panel_disable(&innolux->base);
511 	if (err < 0)
512 		dev_err(&dsi->dev, "failed to disable panel: %d\n", err);
513 
514 	err = mipi_dsi_detach(dsi);
515 	if (err < 0)
516 		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);
517 
518 	innolux_panel_del(innolux);
519 
520 	return 0;
521 }
522 
523 static void innolux_panel_shutdown(struct mipi_dsi_device *dsi)
524 {
525 	struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
526 
527 	drm_panel_unprepare(&innolux->base);
528 	drm_panel_disable(&innolux->base);
529 }
530 
531 static struct mipi_dsi_driver innolux_panel_driver = {
532 	.driver = {
533 		.name = "panel-innolux-p079zca",
534 		.of_match_table = innolux_of_match,
535 	},
536 	.probe = innolux_panel_probe,
537 	.remove = innolux_panel_remove,
538 	.shutdown = innolux_panel_shutdown,
539 };
540 module_mipi_dsi_driver(innolux_panel_driver);
541 
542 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
543 MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
544 MODULE_DESCRIPTION("Innolux P079ZCA panel driver");
545 MODULE_LICENSE("GPL v2");
546