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
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017 Free Electrons
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
#include <drm/drm_device.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#define ST7789V_COLMOD_RGB_FMT_18BITS (6 << 4)
#define ST7789V_COLMOD_CTRL_FMT_18BITS (6 << 0)
#define ST7789V_RAMCTRL_CMD 0xb0
#define ST7789V_RAMCTRL_RM_RGB BIT(4)
#define ST7789V_RAMCTRL_DM_RGB BIT(0)
#define ST7789V_RAMCTRL_MAGIC (3 << 6)
#define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4)
#define ST7789V_RGBCTRL_CMD 0xb1
#define ST7789V_RGBCTRL_WO BIT(7)
#define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5)
#define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
#define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
#define ST7789V_RGBCTRL_PCLK_HIGH BIT(1)
#define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
#define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
#define ST7789V_PORCTRL_CMD 0xb2
#define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4)
#define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf)
#define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4)
#define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf)
#define ST7789V_GCTRL_CMD 0xb7
#define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4)
#define ST7789V_GCTRL_VGLS(n) ((n) & 7)
#define ST7789V_VCOMS_CMD 0xbb
#define ST7789V_LCMCTRL_CMD 0xc0
#define ST7789V_LCMCTRL_XBGR BIT(5)
#define ST7789V_LCMCTRL_XMX BIT(3)
#define ST7789V_LCMCTRL_XMH BIT(2)
#define ST7789V_VDVVRHEN_CMD 0xc2
#define ST7789V_VDVVRHEN_CMDEN BIT(0)
#define ST7789V_VRHS_CMD 0xc3
#define ST7789V_VDVS_CMD 0xc4
#define ST7789V_FRCTRL2_CMD 0xc6
#define ST7789V_PWCTRL1_CMD 0xd0
#define ST7789V_PWCTRL1_MAGIC 0xa4
#define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6)
#define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4)
#define ST7789V_PWCTRL1_VDS(n) ((n) & 3)
#define ST7789V_PVGAMCTRL_CMD 0xe0
#define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4)
#define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4)
#define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf)
#define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf)
#define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f)
#define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7)
#define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4)
#define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f)
#define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf)
#define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4)
#define ST7789V_NVGAMCTRL_CMD 0xe1
#define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4)
#define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4)
#define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf)
#define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf)
#define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f)
#define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7)
#define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4)
#define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f)
#define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf)
#define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4)
#define ST7789V_TEST(val, func) \
do { \
if ((val = (func))) \
return val; \
} while (0)
struct st7789v {
struct drm_panel panel;
struct spi_device *spi;
struct gpio_desc *reset;
struct regulator *power;
};
enum st7789v_prefix {
ST7789V_COMMAND = 0,
ST7789V_DATA = 1,
};
static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel)
{
return container_of(panel, struct st7789v, panel);
}
static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix,
u8 data)
{
struct spi_transfer xfer = { };
struct spi_message msg;
u16 txbuf = ((prefix & 1) << 8) | data;
spi_message_init(&msg);
xfer.tx_buf = &txbuf;
xfer.bits_per_word = 9;
xfer.len = sizeof(txbuf);
spi_message_add_tail(&xfer, &msg);
return spi_sync(ctx->spi, &msg);
}
static int st7789v_write_command(struct st7789v *ctx, u8 cmd)
{
return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd);
}
static int st7789v_write_data(struct st7789v *ctx, u8 cmd)
{
return st7789v_spi_write(ctx, ST7789V_DATA, cmd);
}
static const struct drm_display_mode default_mode = {
.clock = 7000,
.hdisplay = 240,
.hsync_start = 240 + 38,
.hsync_end = 240 + 38 + 10,
.htotal = 240 + 38 + 10 + 10,
.vdisplay = 320,
.vsync_start = 320 + 8,
.vsync_end = 320 + 8 + 4,
.vtotal = 320 + 8 + 4 + 4,
};
static int st7789v_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);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = 61;
connector->display_info.height_mm = 103;
return 1;
}
static int st7789v_prepare(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
int ret;
ret = regulator_enable(ctx->power);
if (ret)
return ret;
gpiod_set_value(ctx->reset, 1);
msleep(30);
gpiod_set_value(ctx->reset, 0);
msleep(120);
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE));
/* We need to wait 120ms after a sleep out command */
msleep(120);
ST7789V_TEST(ret, st7789v_write_command(ctx,
MIPI_DCS_SET_ADDRESS_MODE));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
ST7789V_TEST(ret, st7789v_write_command(ctx,
MIPI_DCS_SET_PIXEL_FORMAT));
ST7789V_TEST(ret, st7789v_write_data(ctx,
(MIPI_DCS_PIXEL_FMT_18BIT << 4) |
(MIPI_DCS_PIXEL_FMT_18BIT)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) |
ST7789V_PORCTRL_IDLE_FP(3)));
ST7789V_TEST(ret, st7789v_write_data(ctx,
ST7789V_PORCTRL_PARTIAL_BP(3) |
ST7789V_PORCTRL_PARTIAL_FP(3)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) |
ST7789V_GCTRL_VGHS(3)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH |
ST7789V_LCMCTRL_XMX |
ST7789V_LCMCTRL_XBGR));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) |
ST7789V_PWCTRL1_AVCL(2) |
ST7789V_PWCTRL1_VDS(1)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) |
ST7789V_PVGAMCTRL_VP36(3)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) |
ST7789V_PVGAMCTRL_VP50(4)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) |
ST7789V_NVGAMCTRL_VN36(5)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) |
ST7789V_NVGAMCTRL_VN50(4)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28)));
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_INVERT_MODE));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB |
ST7789V_RAMCTRL_RM_RGB));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) |
ST7789V_RAMCTRL_MAGIC));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO |
ST7789V_RGBCTRL_RCM(2) |
ST7789V_RGBCTRL_VSYNC_HIGH |
ST7789V_RGBCTRL_HSYNC_HIGH |
ST7789V_RGBCTRL_PCLK_HIGH));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20)));
return 0;
}
static int st7789v_enable(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON);
}
static int st7789v_disable(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
int ret;
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF));
return 0;
}
static int st7789v_unprepare(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
int ret;
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE));
regulator_disable(ctx->power);
return 0;
}
static const struct drm_panel_funcs st7789v_drm_funcs = {
.disable = st7789v_disable,
.enable = st7789v_enable,
.get_modes = st7789v_get_modes,
.prepare = st7789v_prepare,
.unprepare = st7789v_unprepare,
};
static int st7789v_probe(struct spi_device *spi)
{
struct st7789v *ctx;
int ret;
ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
spi_set_drvdata(spi, ctx);
ctx->spi = spi;
drm_panel_init(&ctx->panel, &spi->dev, &st7789v_drm_funcs,
DRM_MODE_CONNECTOR_DPI);
ctx->power = devm_regulator_get(&spi->dev, "power");
if (IS_ERR(ctx->power))
return PTR_ERR(ctx->power);
ctx->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ctx->reset)) {
dev_err(&spi->dev, "Couldn't get our reset line\n");
return PTR_ERR(ctx->reset);
}
ret = drm_panel_of_backlight(&ctx->panel);
if (ret)
return ret;
ret = drm_panel_add(&ctx->panel);
if (ret < 0)
return ret;
return 0;
}
static int st7789v_remove(struct spi_device *spi)
{
struct st7789v *ctx = spi_get_drvdata(spi);
drm_panel_remove(&ctx->panel);
return 0;
}
static const struct of_device_id st7789v_of_match[] = {
{ .compatible = "sitronix,st7789v" },
{ }
};
MODULE_DEVICE_TABLE(of, st7789v_of_match);
static struct spi_driver st7789v_driver = {
.probe = st7789v_probe,
.remove = st7789v_remove,
.driver = {
.name = "st7789v",
.of_match_table = st7789v_of_match,
},
};
module_spi_driver(st7789v_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Sitronix st7789v LCD Driver");
MODULE_LICENSE("GPL v2");
|
