summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/panel/panel-samsung-ld9040.c
blob: 250809ba37c7ea51e58b29c545b76bf493a87ae8 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * ld9040 AMOLED LCD drm_panel driver.
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd
 * Derived from drivers/video/backlight/ld9040.c
 *
 * Andrzej Hajda <a.hajda@samsung.com>
*/

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

#include <video/mipi_display.h>
#include <video/of_videomode.h>
#include <video/videomode.h>

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

/* Manufacturer Command Set */
#define MCS_MANPWR		0xb0
#define MCS_ELVSS_ON		0xb1
#define MCS_USER_SETTING	0xf0
#define MCS_DISPCTL		0xf2
#define MCS_POWER_CTRL		0xf4
#define MCS_GTCON		0xf7
#define MCS_PANEL_CONDITION	0xf8
#define MCS_GAMMA_SET1		0xf9
#define MCS_GAMMA_CTRL		0xfb

/* array of gamma tables for gamma value 2.2 */
static u8 const ld9040_gammas[25][22] = {
	{ 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0,
	  0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 },
	{ 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf,
	  0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 },
	{ 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe,
	  0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 },
	{ 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc,
	  0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d },
	{ 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc,
	  0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 },
	{ 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb,
	  0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 },
	{ 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb,
	  0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c },
	{ 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb,
	  0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 },
	{ 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba,
	  0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 },
	{ 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba,
	  0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a },
	{ 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba,
	  0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e },
	{ 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8,
	  0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 },
	{ 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9,
	  0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 },
	{ 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8,
	  0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 },
	{ 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8,
	  0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d },
	{ 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8,
	  0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 },
	{ 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8,
	  0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 },
	{ 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7,
	  0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 },
	{ 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7,
	  0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a },
	{ 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6,
	  0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d },
	{ 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6,
	  0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 },
	{ 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7,
	  0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 },
	{ 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5,
	  0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 },
	{ 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6,
	  0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa },
	{ 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4,
	  0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 },
};

struct ld9040 {
	struct device *dev;
	struct drm_panel panel;

	struct regulator_bulk_data supplies[2];
	struct gpio_desc *reset_gpio;
	u32 power_on_delay;
	u32 reset_delay;
	struct videomode vm;
	u32 width_mm;
	u32 height_mm;

	int brightness;

	/* This field is tested by functions directly accessing bus before
	 * transfer, transfer is skipped if it is set. In case of transfer
	 * failure or unexpected response the field is set to error value.
	 * Such construct allows to eliminate many checks in higher level
	 * functions.
	 */
	int error;
};

static inline struct ld9040 *panel_to_ld9040(struct drm_panel *panel)
{
	return container_of(panel, struct ld9040, panel);
}

static int ld9040_clear_error(struct ld9040 *ctx)
{
	int ret = ctx->error;

	ctx->error = 0;
	return ret;
}

static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data)
{
	struct spi_device *spi = to_spi_device(ctx->dev);
	struct spi_transfer xfer = {
		.len		= 2,
		.tx_buf		= &data,
	};
	struct spi_message msg;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	return spi_sync(spi, &msg);
}

static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len)
{
	int ret = 0;

	if (ctx->error < 0 || len == 0)
		return;

	dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
	ret = ld9040_spi_write_word(ctx, *data);

	while (!ret && --len) {
		++data;
		ret = ld9040_spi_write_word(ctx, *data | 0x100);
	}

	if (ret) {
		dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
			(int)len, data);
		ctx->error = ret;
	}

	usleep_range(300, 310);
}

#define ld9040_dcs_write_seq_static(ctx, seq...) \
({\
	static const u8 d[] = { seq };\
	ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\
})

static void ld9040_brightness_set(struct ld9040 *ctx)
{
	ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness],
			 ARRAY_SIZE(ld9040_gammas[ctx->brightness]));

	ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a);
}

static void ld9040_init(struct ld9040 *ctx)
{
	ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a);
	ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
		0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d,
		0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d,
		0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02);
	ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL,
		0x02, 0x08, 0x08, 0x10, 0x10);
	ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04);
	ld9040_dcs_write_seq_static(ctx, MCS_POWER_CTRL,
		0x0a, 0x87, 0x25, 0x6a, 0x44, 0x02, 0x88);
	ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16);
	ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00);
	ld9040_brightness_set(ctx);
	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
}

static int ld9040_power_on(struct ld9040 *ctx)
{
	int ret;

	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
	if (ret < 0)
		return ret;

	msleep(ctx->power_on_delay);
	gpiod_set_value(ctx->reset_gpio, 0);
	msleep(ctx->reset_delay);
	gpiod_set_value(ctx->reset_gpio, 1);
	msleep(ctx->reset_delay);

	return 0;
}

static int ld9040_power_off(struct ld9040 *ctx)
{
	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
}

static int ld9040_disable(struct drm_panel *panel)
{
	return 0;
}

static int ld9040_unprepare(struct drm_panel *panel)
{
	struct ld9040 *ctx = panel_to_ld9040(panel);

	msleep(120);
	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
	msleep(40);

	ld9040_clear_error(ctx);

	return ld9040_power_off(ctx);
}

static int ld9040_prepare(struct drm_panel *panel)
{
	struct ld9040 *ctx = panel_to_ld9040(panel);
	int ret;

	ret = ld9040_power_on(ctx);
	if (ret < 0)
		return ret;

	ld9040_init(ctx);

	ret = ld9040_clear_error(ctx);

	if (ret < 0)
		ld9040_unprepare(panel);

	return ret;
}

static int ld9040_enable(struct drm_panel *panel)
{
	return 0;
}

static int ld9040_get_modes(struct drm_panel *panel)
{
	struct drm_connector *connector = panel->connector;
	struct ld9040 *ctx = panel_to_ld9040(panel);
	struct drm_display_mode *mode;

	mode = drm_mode_create(connector->dev);
	if (!mode) {
		DRM_ERROR("failed to create a new display mode\n");
		return 0;
	}

	drm_display_mode_from_videomode(&ctx->vm, mode);
	mode->width_mm = ctx->width_mm;
	mode->height_mm = ctx->height_mm;
	connector->display_info.width_mm = mode->width_mm;
	connector->display_info.height_mm = mode->height_mm;

	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
	drm_mode_probed_add(connector, mode);

	return 1;
}

static const struct drm_panel_funcs ld9040_drm_funcs = {
	.disable = ld9040_disable,
	.unprepare = ld9040_unprepare,
	.prepare = ld9040_prepare,
	.enable = ld9040_enable,
	.get_modes = ld9040_get_modes,
};

static int ld9040_parse_dt(struct ld9040 *ctx)
{
	struct device *dev = ctx->dev;
	struct device_node *np = dev->of_node;
	int ret;

	ret = of_get_videomode(np, &ctx->vm, 0);
	if (ret < 0)
		return ret;

	of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
	of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
	of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
	of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);

	return 0;
}

static int ld9040_probe(struct spi_device *spi)
{
	struct device *dev = &spi->dev;
	struct ld9040 *ctx;
	int ret;

	ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	spi_set_drvdata(spi, ctx);

	ctx->dev = dev;
	ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1;

	ret = ld9040_parse_dt(ctx);
	if (ret < 0)
		return ret;

	ctx->supplies[0].supply = "vdd3";
	ctx->supplies[1].supply = "vci";
	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
				      ctx->supplies);
	if (ret < 0)
		return ret;

	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(ctx->reset_gpio)) {
		dev_err(dev, "cannot get reset-gpios %ld\n",
			PTR_ERR(ctx->reset_gpio));
		return PTR_ERR(ctx->reset_gpio);
	}

	spi->bits_per_word = 9;
	ret = spi_setup(spi);
	if (ret < 0) {
		dev_err(dev, "spi setup failed.\n");
		return ret;
	}

	drm_panel_init(&ctx->panel, dev, &ld9040_drm_funcs,
		       DRM_MODE_CONNECTOR_DPI);

	return drm_panel_add(&ctx->panel);
}

static int ld9040_remove(struct spi_device *spi)
{
	struct ld9040 *ctx = spi_get_drvdata(spi);

	ld9040_power_off(ctx);
	drm_panel_remove(&ctx->panel);

	return 0;
}

static const struct of_device_id ld9040_of_match[] = {
	{ .compatible = "samsung,ld9040" },
	{ }
};
MODULE_DEVICE_TABLE(of, ld9040_of_match);

static struct spi_driver ld9040_driver = {
	.probe = ld9040_probe,
	.remove = ld9040_remove,
	.driver = {
		.name = "panel-samsung-ld9040",
		.of_match_table = ld9040_of_match,
	},
};
module_spi_driver(ld9040_driver);

MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
MODULE_DESCRIPTION("ld9040 LCD Driver");
MODULE_LICENSE("GPL v2");