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path: root/drivers/gpu/drm/panel/panel-ld9040.c
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Diffstat (limited to 'drivers/gpu/drm/panel/panel-ld9040.c')
-rw-r--r--drivers/gpu/drm/panel/panel-ld9040.c376
1 files changed, 376 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-ld9040.c b/drivers/gpu/drm/panel/panel-ld9040.c
new file mode 100644
index 000000000000..1f1f8371a199
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ld9040.c
@@ -0,0 +1,376 @@
1/*
2 * ld9040 AMOLED LCD drm_panel driver.
3 *
4 * Copyright (c) 2014 Samsung Electronics Co., Ltd
5 * Derived from drivers/video/backlight/ld9040.c
6 *
7 * Andrzej Hajda <a.hajda@samsung.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12*/
13
14#include <drm/drmP.h>
15#include <drm/drm_panel.h>
16
17#include <linux/gpio/consumer.h>
18#include <linux/regulator/consumer.h>
19#include <linux/spi/spi.h>
20
21#include <video/mipi_display.h>
22#include <video/of_videomode.h>
23#include <video/videomode.h>
24
25/* Manufacturer Command Set */
26#define MCS_MANPWR 0xb0
27#define MCS_ELVSS_ON 0xb1
28#define MCS_USER_SETTING 0xf0
29#define MCS_DISPCTL 0xf2
30#define MCS_GTCON 0xf7
31#define MCS_PANEL_CONDITION 0xf8
32#define MCS_GAMMA_SET1 0xf9
33#define MCS_GAMMA_CTRL 0xfb
34
35/* array of gamma tables for gamma value 2.2 */
36static u8 const ld9040_gammas[25][22] = {
37 { 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0,
38 0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 },
39 { 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf,
40 0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 },
41 { 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe,
42 0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 },
43 { 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc,
44 0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d },
45 { 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc,
46 0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 },
47 { 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb,
48 0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 },
49 { 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb,
50 0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c },
51 { 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb,
52 0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 },
53 { 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba,
54 0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 },
55 { 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba,
56 0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a },
57 { 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba,
58 0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e },
59 { 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8,
60 0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 },
61 { 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9,
62 0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 },
63 { 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8,
64 0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 },
65 { 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8,
66 0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d },
67 { 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8,
68 0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 },
69 { 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8,
70 0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 },
71 { 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7,
72 0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 },
73 { 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7,
74 0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a },
75 { 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6,
76 0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d },
77 { 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6,
78 0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 },
79 { 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7,
80 0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 },
81 { 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5,
82 0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 },
83 { 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6,
84 0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa },
85 { 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4,
86 0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 },
87};
88
89struct ld9040 {
90 struct device *dev;
91 struct drm_panel panel;
92
93 struct regulator_bulk_data supplies[2];
94 struct gpio_desc *reset_gpio;
95 u32 power_on_delay;
96 u32 reset_delay;
97 struct videomode vm;
98 u32 width_mm;
99 u32 height_mm;
100
101 int brightness;
102
103 /* This field is tested by functions directly accessing bus before
104 * transfer, transfer is skipped if it is set. In case of transfer
105 * failure or unexpected response the field is set to error value.
106 * Such construct allows to eliminate many checks in higher level
107 * functions.
108 */
109 int error;
110};
111
112#define panel_to_ld9040(p) container_of(p, struct ld9040, panel)
113
114static int ld9040_clear_error(struct ld9040 *ctx)
115{
116 int ret = ctx->error;
117
118 ctx->error = 0;
119 return ret;
120}
121
122static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data)
123{
124 struct spi_device *spi = to_spi_device(ctx->dev);
125 struct spi_transfer xfer = {
126 .len = 2,
127 .tx_buf = &data,
128 };
129 struct spi_message msg;
130
131 spi_message_init(&msg);
132 spi_message_add_tail(&xfer, &msg);
133
134 return spi_sync(spi, &msg);
135}
136
137static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len)
138{
139 int ret = 0;
140
141 if (ctx->error < 0 || len == 0)
142 return;
143
144 dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", len, data);
145 ret = ld9040_spi_write_word(ctx, *data);
146
147 while (!ret && --len) {
148 ++data;
149 ret = ld9040_spi_write_word(ctx, *data | 0x100);
150 }
151
152 if (ret) {
153 dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret, len,
154 data);
155 ctx->error = ret;
156 }
157
158 usleep_range(300, 310);
159}
160
161#define ld9040_dcs_write_seq_static(ctx, seq...) \
162({\
163 static const u8 d[] = { seq };\
164 ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\
165})
166
167static void ld9040_brightness_set(struct ld9040 *ctx)
168{
169 ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness],
170 ARRAY_SIZE(ld9040_gammas[ctx->brightness]));
171
172 ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a);
173}
174
175static void ld9040_init(struct ld9040 *ctx)
176{
177 ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a);
178 ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
179 0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d,
180 0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d,
181 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02);
182 ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL,
183 0x02, 0x08, 0x08, 0x10, 0x10);
184 ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04);
185 ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16);
186 ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00);
187 ld9040_brightness_set(ctx);
188 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
189 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
190}
191
192static int ld9040_power_on(struct ld9040 *ctx)
193{
194 int ret;
195
196 ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
197 if (ret < 0)
198 return ret;
199
200 msleep(ctx->power_on_delay);
201 gpiod_set_value(ctx->reset_gpio, 0);
202 msleep(ctx->reset_delay);
203 gpiod_set_value(ctx->reset_gpio, 1);
204 msleep(ctx->reset_delay);
205
206 return 0;
207}
208
209static int ld9040_power_off(struct ld9040 *ctx)
210{
211 return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
212}
213
214static int ld9040_disable(struct drm_panel *panel)
215{
216 struct ld9040 *ctx = panel_to_ld9040(panel);
217
218 msleep(120);
219 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
220 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
221 msleep(40);
222
223 ld9040_clear_error(ctx);
224
225 return ld9040_power_off(ctx);
226}
227
228static int ld9040_enable(struct drm_panel *panel)
229{
230 struct ld9040 *ctx = panel_to_ld9040(panel);
231 int ret;
232
233 ret = ld9040_power_on(ctx);
234 if (ret < 0)
235 return ret;
236
237 ld9040_init(ctx);
238
239 ret = ld9040_clear_error(ctx);
240
241 if (ret < 0)
242 ld9040_disable(panel);
243
244 return ret;
245}
246
247static int ld9040_get_modes(struct drm_panel *panel)
248{
249 struct drm_connector *connector = panel->connector;
250 struct ld9040 *ctx = panel_to_ld9040(panel);
251 struct drm_display_mode *mode;
252
253 mode = drm_mode_create(connector->dev);
254 if (!mode) {
255 DRM_ERROR("failed to create a new display mode\n");
256 return 0;
257 }
258
259 drm_display_mode_from_videomode(&ctx->vm, mode);
260 mode->width_mm = ctx->width_mm;
261 mode->height_mm = ctx->height_mm;
262 connector->display_info.width_mm = mode->width_mm;
263 connector->display_info.height_mm = mode->height_mm;
264
265 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
266 drm_mode_probed_add(connector, mode);
267
268 return 1;
269}
270
271static const struct drm_panel_funcs ld9040_drm_funcs = {
272 .disable = ld9040_disable,
273 .enable = ld9040_enable,
274 .get_modes = ld9040_get_modes,
275};
276
277static int ld9040_parse_dt(struct ld9040 *ctx)
278{
279 struct device *dev = ctx->dev;
280 struct device_node *np = dev->of_node;
281 int ret;
282
283 ret = of_get_videomode(np, &ctx->vm, 0);
284 if (ret < 0)
285 return ret;
286
287 of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
288 of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
289 of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
290 of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
291
292 return 0;
293}
294
295static int ld9040_probe(struct spi_device *spi)
296{
297 struct device *dev = &spi->dev;
298 struct ld9040 *ctx;
299 int ret;
300
301 ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL);
302 if (!ctx)
303 return -ENOMEM;
304
305 spi_set_drvdata(spi, ctx);
306
307 ctx->dev = dev;
308 ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1;
309
310 ret = ld9040_parse_dt(ctx);
311 if (ret < 0)
312 return ret;
313
314 ctx->supplies[0].supply = "vdd3";
315 ctx->supplies[1].supply = "vci";
316 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
317 ctx->supplies);
318 if (ret < 0)
319 return ret;
320
321 ctx->reset_gpio = devm_gpiod_get(dev, "reset");
322 if (IS_ERR(ctx->reset_gpio)) {
323 dev_err(dev, "cannot get reset-gpios %ld\n",
324 PTR_ERR(ctx->reset_gpio));
325 return PTR_ERR(ctx->reset_gpio);
326 }
327 ret = gpiod_direction_output(ctx->reset_gpio, 1);
328 if (ret < 0) {
329 dev_err(dev, "cannot configure reset-gpios %d\n", ret);
330 return ret;
331 }
332
333 spi->bits_per_word = 9;
334 ret = spi_setup(spi);
335 if (ret < 0) {
336 dev_err(dev, "spi setup failed.\n");
337 return ret;
338 }
339
340 drm_panel_init(&ctx->panel);
341 ctx->panel.dev = dev;
342 ctx->panel.funcs = &ld9040_drm_funcs;
343
344 return drm_panel_add(&ctx->panel);
345}
346
347static int ld9040_remove(struct spi_device *spi)
348{
349 struct ld9040 *ctx = spi_get_drvdata(spi);
350
351 ld9040_power_off(ctx);
352 drm_panel_remove(&ctx->panel);
353
354 return 0;
355}
356
357static struct of_device_id ld9040_of_match[] = {
358 { .compatible = "samsung,ld9040" },
359 { }
360};
361MODULE_DEVICE_TABLE(of, ld9040_of_match);
362
363static struct spi_driver ld9040_driver = {
364 .probe = ld9040_probe,
365 .remove = ld9040_remove,
366 .driver = {
367 .name = "ld9040",
368 .owner = THIS_MODULE,
369 .of_match_table = ld9040_of_match,
370 },
371};
372module_spi_driver(ld9040_driver);
373
374MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
375MODULE_DESCRIPTION("ld9040 LCD Driver");
376MODULE_LICENSE("GPL v2");