summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/panel/panel-startek-kd070fhfid015.c
blob: 0156689f41cdaf96a27d118cb3e328ffd5f50947 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2016 InforceComputing
 * Copyright (C) 2016 Linaro Ltd
 * Copyright (C) 2023 BayLibre, SAS
 *
 * Authors:
 * - Vinay Simha BN <simhavcs@gmail.com>
 * - Sumit Semwal <sumit.semwal@linaro.org>
 * - Guillaume La Roque <glaroque@baylibre.com>
 *
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

#include <video/mipi_display.h>

#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>

#define DSI_REG_MCAP	0xB0
#define DSI_REG_IS	0xB3 /* Interface Setting */
#define DSI_REG_IIS	0xB4 /* Interface ID Setting */
#define DSI_REG_CTRL	0xB6

enum {
	IOVCC = 0,
	POWER = 1
};

struct stk_panel {
	const struct drm_display_mode *mode;
	struct backlight_device *backlight;
	struct drm_panel base;
	struct gpio_desc *enable_gpio; /* Power IC supply enable */
	struct gpio_desc *reset_gpio; /* External reset */
	struct mipi_dsi_device *dsi;
	struct regulator_bulk_data supplies[2];
};

static inline struct stk_panel *to_stk_panel(struct drm_panel *panel)
{
	return container_of(panel, struct stk_panel, base);
}

static int stk_panel_init(struct stk_panel *stk)
{
	struct mipi_dsi_device *dsi = stk->dsi;
	struct device *dev = &stk->dsi->dev;
	int ret;

	ret = mipi_dsi_dcs_soft_reset(dsi);
	if (ret < 0) {
		dev_err(dev, "failed to mipi_dsi_dcs_soft_reset: %d\n", ret);
		return ret;
	}
	mdelay(5);

	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
	if (ret < 0) {
		dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
		return ret;
	}
	msleep(120);

	mipi_dsi_generic_write_seq(dsi, DSI_REG_MCAP, 0x04);

	/* Interface setting, video mode */
	mipi_dsi_generic_write_seq(dsi, DSI_REG_IS, 0x14, 0x08, 0x00, 0x22, 0x00);
	mipi_dsi_generic_write_seq(dsi, DSI_REG_IIS, 0x0C, 0x00);
	mipi_dsi_generic_write_seq(dsi, DSI_REG_CTRL, 0x3A, 0xD3);

	ret = mipi_dsi_dcs_set_display_brightness(dsi, 0x77);
	if (ret < 0) {
		dev_err(dev, "failed to write display brightness: %d\n", ret);
		return ret;
	}

	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
			       MIPI_DCS_WRITE_MEMORY_START);

	ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x77);
	if (ret < 0) {
		dev_err(dev, "failed to set pixel format: %d\n", ret);
		return ret;
	}

	ret = mipi_dsi_dcs_set_column_address(dsi, 0, stk->mode->hdisplay - 1);
	if (ret < 0) {
		dev_err(dev, "failed to set column address: %d\n", ret);
		return ret;
	}

	ret = mipi_dsi_dcs_set_page_address(dsi, 0, stk->mode->vdisplay - 1);
	if (ret < 0) {
		dev_err(dev, "failed to set page address: %d\n", ret);
		return ret;
	}

	return 0;
}

static int stk_panel_on(struct stk_panel *stk)
{
	struct mipi_dsi_device *dsi = stk->dsi;
	struct device *dev = &stk->dsi->dev;
	int ret;

	ret = mipi_dsi_dcs_set_display_on(dsi);
	if (ret < 0)
		dev_err(dev, "failed to set display on: %d\n", ret);

	mdelay(20);

	return ret;
}

static void stk_panel_off(struct stk_panel *stk)
{
	struct mipi_dsi_device *dsi = stk->dsi;
	struct device *dev = &stk->dsi->dev;
	int ret;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_set_display_off(dsi);
	if (ret < 0)
		dev_err(dev, "failed to set display off: %d\n", ret);

	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
	if (ret < 0)
		dev_err(dev, "failed to enter sleep mode: %d\n", ret);

	msleep(100);
}

static int stk_panel_unprepare(struct drm_panel *panel)
{
	struct stk_panel *stk = to_stk_panel(panel);

	stk_panel_off(stk);
	regulator_bulk_disable(ARRAY_SIZE(stk->supplies), stk->supplies);
	gpiod_set_value(stk->reset_gpio, 0);
	gpiod_set_value(stk->enable_gpio, 1);

	return 0;
}

static int stk_panel_prepare(struct drm_panel *panel)
{
	struct stk_panel *stk = to_stk_panel(panel);
	struct device *dev = &stk->dsi->dev;
	int ret;

	gpiod_set_value(stk->reset_gpio, 0);
	gpiod_set_value(stk->enable_gpio, 0);
	ret = regulator_enable(stk->supplies[IOVCC].consumer);
	if (ret < 0)
		return ret;

	mdelay(8);
	ret = regulator_enable(stk->supplies[POWER].consumer);
	if (ret < 0)
		goto iovccoff;

	mdelay(20);
	gpiod_set_value(stk->enable_gpio, 1);
	mdelay(20);
	gpiod_set_value(stk->reset_gpio, 1);
	mdelay(10);
	ret = stk_panel_init(stk);
	if (ret < 0) {
		dev_err(dev, "failed to init panel: %d\n", ret);
		goto poweroff;
	}

	ret = stk_panel_on(stk);
	if (ret < 0) {
		dev_err(dev, "failed to set panel on: %d\n", ret);
		goto poweroff;
	}

	return 0;

poweroff:
	regulator_disable(stk->supplies[POWER].consumer);
iovccoff:
	regulator_disable(stk->supplies[IOVCC].consumer);
	gpiod_set_value(stk->reset_gpio, 0);
	gpiod_set_value(stk->enable_gpio, 0);

	return ret;
}

static const struct drm_display_mode default_mode = {
		.clock = 163204,
		.hdisplay = 1200,
		.hsync_start = 1200 + 144,
		.hsync_end = 1200 + 144 + 16,
		.htotal = 1200 + 144 + 16 + 45,
		.vdisplay = 1920,
		.vsync_start = 1920 + 8,
		.vsync_end = 1920 + 8 + 4,
		.vtotal = 1920 + 8 + 4 + 4,
		.width_mm = 95,
		.height_mm = 151,
};

static int stk_panel_get_modes(struct drm_panel *panel,
			       struct drm_connector *connector)
{
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(connector->dev, &default_mode);
	if (!mode) {
		dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
			default_mode.hdisplay, default_mode.vdisplay,
			drm_mode_vrefresh(&default_mode));
		return -ENOMEM;
	}

	drm_mode_set_name(mode);
	drm_mode_probed_add(connector, mode);
	connector->display_info.width_mm = default_mode.width_mm;
	connector->display_info.height_mm = default_mode.height_mm;
	return 1;
}

static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
{
	struct mipi_dsi_device *dsi = bl_get_data(bl);
	int ret;
	u16 brightness;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
	if (ret < 0)
		return ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
	return brightness & 0xff;
}

static int dsi_dcs_bl_update_status(struct backlight_device *bl)
{
	struct mipi_dsi_device *dsi = bl_get_data(bl);
	struct device *dev = &dsi->dev;
	int ret;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
	if (ret < 0) {
		dev_err(dev, "failed to set DSI control: %d\n", ret);
		return ret;
	}

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
	return 0;
}

static const struct backlight_ops dsi_bl_ops = {
	.update_status = dsi_dcs_bl_update_status,
	.get_brightness = dsi_dcs_bl_get_brightness,
};

static struct backlight_device *
drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
{
	struct device *dev = &dsi->dev;
	struct backlight_properties props = {
		.type = BACKLIGHT_RAW,
		.brightness = 255,
		.max_brightness = 255,
	};

	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
					      &dsi_bl_ops, &props);
}

static const struct drm_panel_funcs stk_panel_funcs = {
	.unprepare = stk_panel_unprepare,
	.prepare = stk_panel_prepare,
	.get_modes = stk_panel_get_modes,
};

static const struct of_device_id stk_of_match[] = {
	{ .compatible = "startek,kd070fhfid015", },
	{ }
};
MODULE_DEVICE_TABLE(of, stk_of_match);

static int stk_panel_add(struct stk_panel *stk)
{
	struct device *dev = &stk->dsi->dev;
	int ret;

	stk->mode = &default_mode;

	stk->supplies[IOVCC].supply = "iovcc";
	stk->supplies[POWER].supply = "power";
	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(stk->supplies), stk->supplies);
	if (ret) {
		dev_err(dev, "regulator_bulk failed\n");
		return ret;
	}

	stk->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(stk->reset_gpio)) {
		ret = PTR_ERR(stk->reset_gpio);
		dev_err(dev, "cannot get reset-gpios %d\n", ret);
		return ret;
	}

	stk->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
	if (IS_ERR(stk->enable_gpio)) {
		ret = PTR_ERR(stk->enable_gpio);
		dev_err(dev, "cannot get enable-gpio %d\n", ret);
		return ret;
	}

	stk->backlight = drm_panel_create_dsi_backlight(stk->dsi);
	if (IS_ERR(stk->backlight)) {
		ret = PTR_ERR(stk->backlight);
		dev_err(dev, "failed to register backlight %d\n", ret);
		return ret;
	}

	drm_panel_init(&stk->base, &stk->dsi->dev, &stk_panel_funcs,
		       DRM_MODE_CONNECTOR_DSI);

	drm_panel_add(&stk->base);

	return 0;
}

static int stk_panel_probe(struct mipi_dsi_device *dsi)
{
	struct stk_panel *stk;
	int ret;

	dsi->lanes = 4;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->mode_flags = (MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM);

	stk = devm_kzalloc(&dsi->dev, sizeof(*stk), GFP_KERNEL);
	if (!stk)
		return -ENOMEM;

	mipi_dsi_set_drvdata(dsi, stk);

	stk->dsi = dsi;

	ret = stk_panel_add(stk);
	if (ret < 0)
		return ret;

	ret = mipi_dsi_attach(dsi);
	if (ret < 0)
		drm_panel_remove(&stk->base);

	return 0;
}

static void stk_panel_remove(struct mipi_dsi_device *dsi)
{
	struct stk_panel *stk = mipi_dsi_get_drvdata(dsi);
	int err;

	err = mipi_dsi_detach(dsi);
	if (err < 0)
		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
			err);

	drm_panel_remove(&stk->base);
}

static struct mipi_dsi_driver stk_panel_driver = {
	.driver = {
		.name = "panel-startek-kd070fhfid015",
		.of_match_table = stk_of_match,
	},
	.probe = stk_panel_probe,
	.remove = stk_panel_remove,
};
module_mipi_dsi_driver(stk_panel_driver);

MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
MODULE_DESCRIPTION("STARTEK KD070FHFID015");
MODULE_LICENSE("GPL");