1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017 Free Electrons
4 */
5
6 #include <linux/delay.h>
7 #include <linux/gpio/consumer.h>
8 #include <linux/module.h>
9 #include <linux/regulator/consumer.h>
10 #include <linux/spi/spi.h>
11
12 #include <video/mipi_display.h>
13
14 #include <drm/drm_device.h>
15 #include <drm/drm_modes.h>
16 #include <drm/drm_panel.h>
17
18 #define ST7789V_COLMOD_RGB_FMT_18BITS (6 << 4)
19 #define ST7789V_COLMOD_CTRL_FMT_18BITS (6 << 0)
20
21 #define ST7789V_RAMCTRL_CMD 0xb0
22 #define ST7789V_RAMCTRL_RM_RGB BIT(4)
23 #define ST7789V_RAMCTRL_DM_RGB BIT(0)
24 #define ST7789V_RAMCTRL_MAGIC (3 << 6)
25 #define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4)
26
27 #define ST7789V_RGBCTRL_CMD 0xb1
28 #define ST7789V_RGBCTRL_WO BIT(7)
29 #define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5)
30 #define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
31 #define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
32 #define ST7789V_RGBCTRL_PCLK_HIGH BIT(1)
33 #define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
34 #define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
35
36 #define ST7789V_PORCTRL_CMD 0xb2
37 #define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4)
38 #define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf)
39 #define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4)
40 #define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf)
41
42 #define ST7789V_GCTRL_CMD 0xb7
43 #define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4)
44 #define ST7789V_GCTRL_VGLS(n) ((n) & 7)
45
46 #define ST7789V_VCOMS_CMD 0xbb
47
48 #define ST7789V_LCMCTRL_CMD 0xc0
49 #define ST7789V_LCMCTRL_XBGR BIT(5)
50 #define ST7789V_LCMCTRL_XMX BIT(3)
51 #define ST7789V_LCMCTRL_XMH BIT(2)
52
53 #define ST7789V_VDVVRHEN_CMD 0xc2
54 #define ST7789V_VDVVRHEN_CMDEN BIT(0)
55
56 #define ST7789V_VRHS_CMD 0xc3
57
58 #define ST7789V_VDVS_CMD 0xc4
59
60 #define ST7789V_FRCTRL2_CMD 0xc6
61
62 #define ST7789V_PWCTRL1_CMD 0xd0
63 #define ST7789V_PWCTRL1_MAGIC 0xa4
64 #define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6)
65 #define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4)
66 #define ST7789V_PWCTRL1_VDS(n) ((n) & 3)
67
68 #define ST7789V_PVGAMCTRL_CMD 0xe0
69 #define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4)
70 #define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4)
71 #define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf)
72 #define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f)
73 #define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f)
74 #define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f)
75 #define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f)
76 #define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf)
77 #define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f)
78 #define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7)
79 #define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4)
80 #define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f)
81 #define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf)
82 #define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f)
83 #define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f)
84 #define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f)
85 #define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f)
86 #define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4)
87
88 #define ST7789V_NVGAMCTRL_CMD 0xe1
89 #define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4)
90 #define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4)
91 #define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf)
92 #define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f)
93 #define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f)
94 #define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f)
95 #define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f)
96 #define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf)
97 #define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f)
98 #define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7)
99 #define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4)
100 #define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f)
101 #define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf)
102 #define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f)
103 #define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f)
104 #define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f)
105 #define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f)
106 #define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4)
107
108 #define ST7789V_TEST(val, func) \
109 do { \
110 if ((val = (func))) \
111 return val; \
112 } while (0)
113
114 struct st7789v {
115 struct drm_panel panel;
116 struct spi_device *spi;
117 struct gpio_desc *reset;
118 struct regulator *power;
119 };
120
121 enum st7789v_prefix {
122 ST7789V_COMMAND = 0,
123 ST7789V_DATA = 1,
124 };
125
panel_to_st7789v(struct drm_panel * panel)126 static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel)
127 {
128 return container_of(panel, struct st7789v, panel);
129 }
130
st7789v_spi_write(struct st7789v * ctx,enum st7789v_prefix prefix,u8 data)131 static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix,
132 u8 data)
133 {
134 struct spi_transfer xfer = { };
135 struct spi_message msg;
136 u16 txbuf = ((prefix & 1) << 8) | data;
137
138 spi_message_init(&msg);
139
140 xfer.tx_buf = &txbuf;
141 xfer.bits_per_word = 9;
142 xfer.len = sizeof(txbuf);
143
144 spi_message_add_tail(&xfer, &msg);
145 return spi_sync(ctx->spi, &msg);
146 }
147
st7789v_write_command(struct st7789v * ctx,u8 cmd)148 static int st7789v_write_command(struct st7789v *ctx, u8 cmd)
149 {
150 return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd);
151 }
152
st7789v_write_data(struct st7789v * ctx,u8 cmd)153 static int st7789v_write_data(struct st7789v *ctx, u8 cmd)
154 {
155 return st7789v_spi_write(ctx, ST7789V_DATA, cmd);
156 }
157
158 static const struct drm_display_mode default_mode = {
159 .clock = 7000,
160 .hdisplay = 240,
161 .hsync_start = 240 + 38,
162 .hsync_end = 240 + 38 + 10,
163 .htotal = 240 + 38 + 10 + 10,
164 .vdisplay = 320,
165 .vsync_start = 320 + 8,
166 .vsync_end = 320 + 8 + 4,
167 .vtotal = 320 + 8 + 4 + 4,
168 };
169
st7789v_get_modes(struct drm_panel * panel,struct drm_connector * connector)170 static int st7789v_get_modes(struct drm_panel *panel,
171 struct drm_connector *connector)
172 {
173 struct drm_display_mode *mode;
174
175 mode = drm_mode_duplicate(connector->dev, &default_mode);
176 if (!mode) {
177 dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
178 default_mode.hdisplay, default_mode.vdisplay,
179 drm_mode_vrefresh(&default_mode));
180 return -ENOMEM;
181 }
182
183 drm_mode_set_name(mode);
184
185 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
186 drm_mode_probed_add(connector, mode);
187
188 connector->display_info.width_mm = 61;
189 connector->display_info.height_mm = 103;
190
191 return 1;
192 }
193
st7789v_prepare(struct drm_panel * panel)194 static int st7789v_prepare(struct drm_panel *panel)
195 {
196 struct st7789v *ctx = panel_to_st7789v(panel);
197 int ret;
198
199 ret = regulator_enable(ctx->power);
200 if (ret)
201 return ret;
202
203 gpiod_set_value(ctx->reset, 1);
204 msleep(30);
205 gpiod_set_value(ctx->reset, 0);
206 msleep(120);
207
208 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE));
209
210 /* We need to wait 120ms after a sleep out command */
211 msleep(120);
212
213 ST7789V_TEST(ret, st7789v_write_command(ctx,
214 MIPI_DCS_SET_ADDRESS_MODE));
215 ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
216
217 ST7789V_TEST(ret, st7789v_write_command(ctx,
218 MIPI_DCS_SET_PIXEL_FORMAT));
219 ST7789V_TEST(ret, st7789v_write_data(ctx,
220 (MIPI_DCS_PIXEL_FMT_18BIT << 4) |
221 (MIPI_DCS_PIXEL_FMT_18BIT)));
222
223 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD));
224 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
225 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
226 ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
227 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) |
228 ST7789V_PORCTRL_IDLE_FP(3)));
229 ST7789V_TEST(ret, st7789v_write_data(ctx,
230 ST7789V_PORCTRL_PARTIAL_BP(3) |
231 ST7789V_PORCTRL_PARTIAL_FP(3)));
232
233 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD));
234 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) |
235 ST7789V_GCTRL_VGHS(3)));
236
237 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD));
238 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b));
239
240 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD));
241 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH |
242 ST7789V_LCMCTRL_XMX |
243 ST7789V_LCMCTRL_XBGR));
244
245 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD));
246 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN));
247
248 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD));
249 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
250
251 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD));
252 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20));
253
254 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD));
255 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
256
257 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD));
258 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC));
259 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) |
260 ST7789V_PWCTRL1_AVCL(2) |
261 ST7789V_PWCTRL1_VDS(1)));
262
263 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD));
264 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd)));
265 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca)));
266 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe)));
267 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8)));
268 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9)));
269 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7)));
270 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d)));
271 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) |
272 ST7789V_PVGAMCTRL_VP36(3)));
273 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d)));
274 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) |
275 ST7789V_PVGAMCTRL_VP50(4)));
276 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa)));
277 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa)));
278 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b)));
279 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28)));
280
281 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD));
282 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd)));
283 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca)));
284 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf)));
285 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8)));
286 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8)));
287 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7)));
288 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e)));
289 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) |
290 ST7789V_NVGAMCTRL_VN36(5)));
291 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40)));
292 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) |
293 ST7789V_NVGAMCTRL_VN50(4)));
294 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9)));
295 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb)));
296 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b)));
297 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28)));
298
299 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_INVERT_MODE));
300
301 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD));
302 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB |
303 ST7789V_RAMCTRL_RM_RGB));
304 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) |
305 ST7789V_RAMCTRL_MAGIC));
306
307 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));
308 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO |
309 ST7789V_RGBCTRL_RCM(2) |
310 ST7789V_RGBCTRL_VSYNC_HIGH |
311 ST7789V_RGBCTRL_HSYNC_HIGH |
312 ST7789V_RGBCTRL_PCLK_HIGH));
313 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));
314 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20)));
315
316 return 0;
317 }
318
st7789v_enable(struct drm_panel * panel)319 static int st7789v_enable(struct drm_panel *panel)
320 {
321 struct st7789v *ctx = panel_to_st7789v(panel);
322
323 return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON);
324 }
325
st7789v_disable(struct drm_panel * panel)326 static int st7789v_disable(struct drm_panel *panel)
327 {
328 struct st7789v *ctx = panel_to_st7789v(panel);
329 int ret;
330
331 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF));
332
333 return 0;
334 }
335
st7789v_unprepare(struct drm_panel * panel)336 static int st7789v_unprepare(struct drm_panel *panel)
337 {
338 struct st7789v *ctx = panel_to_st7789v(panel);
339 int ret;
340
341 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE));
342
343 regulator_disable(ctx->power);
344
345 return 0;
346 }
347
348 static const struct drm_panel_funcs st7789v_drm_funcs = {
349 .disable = st7789v_disable,
350 .enable = st7789v_enable,
351 .get_modes = st7789v_get_modes,
352 .prepare = st7789v_prepare,
353 .unprepare = st7789v_unprepare,
354 };
355
st7789v_probe(struct spi_device * spi)356 static int st7789v_probe(struct spi_device *spi)
357 {
358 struct st7789v *ctx;
359 int ret;
360
361 ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
362 if (!ctx)
363 return -ENOMEM;
364
365 spi_set_drvdata(spi, ctx);
366 ctx->spi = spi;
367
368 drm_panel_init(&ctx->panel, &spi->dev, &st7789v_drm_funcs,
369 DRM_MODE_CONNECTOR_DPI);
370
371 ctx->power = devm_regulator_get(&spi->dev, "power");
372 if (IS_ERR(ctx->power))
373 return PTR_ERR(ctx->power);
374
375 ctx->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
376 if (IS_ERR(ctx->reset)) {
377 dev_err(&spi->dev, "Couldn't get our reset line\n");
378 return PTR_ERR(ctx->reset);
379 }
380
381 ret = drm_panel_of_backlight(&ctx->panel);
382 if (ret)
383 return ret;
384
385 drm_panel_add(&ctx->panel);
386
387 return 0;
388 }
389
st7789v_remove(struct spi_device * spi)390 static void st7789v_remove(struct spi_device *spi)
391 {
392 struct st7789v *ctx = spi_get_drvdata(spi);
393
394 drm_panel_remove(&ctx->panel);
395 }
396
397 static const struct of_device_id st7789v_of_match[] = {
398 { .compatible = "sitronix,st7789v" },
399 { }
400 };
401 MODULE_DEVICE_TABLE(of, st7789v_of_match);
402
403 static struct spi_driver st7789v_driver = {
404 .probe = st7789v_probe,
405 .remove = st7789v_remove,
406 .driver = {
407 .name = "st7789v",
408 .of_match_table = st7789v_of_match,
409 },
410 };
411 module_spi_driver(st7789v_driver);
412
413 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
414 MODULE_DESCRIPTION("Sitronix st7789v LCD Driver");
415 MODULE_LICENSE("GPL v2");
416
