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 #include <linux/media-bus-format.h>
14
15 #include <drm/drm_device.h>
16 #include <drm/drm_modes.h>
17 #include <drm/drm_panel.h>
18
19 #define ST7789V_RAMCTRL_CMD 0xb0
20 #define ST7789V_RAMCTRL_RM_RGB BIT(4)
21 #define ST7789V_RAMCTRL_DM_RGB BIT(0)
22 #define ST7789V_RAMCTRL_MAGIC (3 << 6)
23 #define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4)
24
25 #define ST7789V_RGBCTRL_CMD 0xb1
26 #define ST7789V_RGBCTRL_WO BIT(7)
27 #define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5)
28 #define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
29 #define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
30 #define ST7789V_RGBCTRL_PCLK_FALLING BIT(1)
31 #define ST7789V_RGBCTRL_DE_LOW BIT(0)
32 #define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
33 #define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
34
35 #define ST7789V_PORCTRL_CMD 0xb2
36 #define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4)
37 #define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf)
38 #define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4)
39 #define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf)
40
41 #define ST7789V_GCTRL_CMD 0xb7
42 #define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4)
43 #define ST7789V_GCTRL_VGLS(n) ((n) & 7)
44
45 #define ST7789V_VCOMS_CMD 0xbb
46
47 #define ST7789V_LCMCTRL_CMD 0xc0
48 #define ST7789V_LCMCTRL_XBGR BIT(5)
49 #define ST7789V_LCMCTRL_XMX BIT(3)
50 #define ST7789V_LCMCTRL_XMH BIT(2)
51
52 #define ST7789V_VDVVRHEN_CMD 0xc2
53 #define ST7789V_VDVVRHEN_CMDEN BIT(0)
54
55 #define ST7789V_VRHS_CMD 0xc3
56
57 #define ST7789V_VDVS_CMD 0xc4
58
59 #define ST7789V_FRCTRL2_CMD 0xc6
60
61 #define ST7789V_PWCTRL1_CMD 0xd0
62 #define ST7789V_PWCTRL1_MAGIC 0xa4
63 #define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6)
64 #define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4)
65 #define ST7789V_PWCTRL1_VDS(n) ((n) & 3)
66
67 #define ST7789V_PVGAMCTRL_CMD 0xe0
68 #define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4)
69 #define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4)
70 #define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf)
71 #define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f)
72 #define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f)
73 #define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f)
74 #define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f)
75 #define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf)
76 #define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f)
77 #define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7)
78 #define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4)
79 #define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f)
80 #define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf)
81 #define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f)
82 #define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f)
83 #define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f)
84 #define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f)
85 #define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4)
86
87 #define ST7789V_NVGAMCTRL_CMD 0xe1
88 #define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4)
89 #define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4)
90 #define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf)
91 #define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f)
92 #define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f)
93 #define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f)
94 #define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f)
95 #define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf)
96 #define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f)
97 #define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7)
98 #define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4)
99 #define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f)
100 #define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf)
101 #define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f)
102 #define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f)
103 #define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f)
104 #define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f)
105 #define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4)
106
107 #define ST7789V_TEST(val, func) \
108 do { \
109 if ((val = (func))) \
110 return val; \
111 } while (0)
112
113 #define ST7789V_IDS { 0x85, 0x85, 0x52 }
114 #define ST7789V_IDS_SIZE 3
115
116 struct st7789_panel_info {
117 const struct drm_display_mode *mode;
118 u32 bus_format;
119 u32 bus_flags;
120 bool invert_mode;
121 bool partial_mode;
122 u16 partial_start;
123 u16 partial_end;
124 };
125
126 struct st7789v {
127 struct drm_panel panel;
128 const struct st7789_panel_info *info;
129 struct spi_device *spi;
130 struct gpio_desc *reset;
131 struct regulator *power;
132 enum drm_panel_orientation orientation;
133 };
134
135 enum st7789v_prefix {
136 ST7789V_COMMAND = 0,
137 ST7789V_DATA = 1,
138 };
139
panel_to_st7789v(struct drm_panel * panel)140 static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel)
141 {
142 return container_of(panel, struct st7789v, panel);
143 }
144
st7789v_spi_write(struct st7789v * ctx,enum st7789v_prefix prefix,u8 data)145 static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix,
146 u8 data)
147 {
148 struct spi_transfer xfer = { };
149 u16 txbuf = ((prefix & 1) << 8) | data;
150
151 xfer.tx_buf = &txbuf;
152 xfer.len = sizeof(txbuf);
153
154 return spi_sync_transfer(ctx->spi, &xfer, 1);
155 }
156
st7789v_write_command(struct st7789v * ctx,u8 cmd)157 static int st7789v_write_command(struct st7789v *ctx, u8 cmd)
158 {
159 return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd);
160 }
161
st7789v_write_data(struct st7789v * ctx,u8 cmd)162 static int st7789v_write_data(struct st7789v *ctx, u8 cmd)
163 {
164 return st7789v_spi_write(ctx, ST7789V_DATA, cmd);
165 }
166
st7789v_read_data(struct st7789v * ctx,u8 cmd,u8 * buf,unsigned int len)167 static int st7789v_read_data(struct st7789v *ctx, u8 cmd, u8 *buf,
168 unsigned int len)
169 {
170 struct spi_transfer xfer[2] = { };
171 struct spi_message msg;
172 u16 txbuf = ((ST7789V_COMMAND & 1) << 8) | cmd;
173 u16 rxbuf[4] = {};
174 u8 bit9 = 0;
175 int ret, i;
176
177 switch (len) {
178 case 1:
179 case 3:
180 case 4:
181 break;
182 default:
183 return -EOPNOTSUPP;
184 }
185
186 spi_message_init(&msg);
187
188 xfer[0].tx_buf = &txbuf;
189 xfer[0].len = sizeof(txbuf);
190 spi_message_add_tail(&xfer[0], &msg);
191
192 xfer[1].rx_buf = rxbuf;
193 xfer[1].len = len * 2;
194 spi_message_add_tail(&xfer[1], &msg);
195
196 ret = spi_sync(ctx->spi, &msg);
197 if (ret)
198 return ret;
199
200 for (i = 0; i < len; i++) {
201 buf[i] = rxbuf[i] >> i | (bit9 << (9 - i));
202 if (i)
203 bit9 = rxbuf[i] & GENMASK(i - 1, 0);
204 }
205
206 return 0;
207 }
208
st7789v_check_id(struct drm_panel * panel)209 static int st7789v_check_id(struct drm_panel *panel)
210 {
211 const u8 st7789v_ids[ST7789V_IDS_SIZE] = ST7789V_IDS;
212 struct st7789v *ctx = panel_to_st7789v(panel);
213 bool invalid_ids = false;
214 int ret, i;
215 u8 ids[3];
216
217 if (ctx->spi->mode & SPI_NO_RX)
218 return 0;
219
220 ret = st7789v_read_data(ctx, MIPI_DCS_GET_DISPLAY_ID, ids, ST7789V_IDS_SIZE);
221 if (ret)
222 return ret;
223
224 for (i = 0; i < ST7789V_IDS_SIZE; i++) {
225 if (ids[i] != st7789v_ids[i]) {
226 invalid_ids = true;
227 break;
228 }
229 }
230
231 if (invalid_ids)
232 return -EIO;
233
234 return 0;
235 }
236
237 static const struct drm_display_mode default_mode = {
238 .clock = 7000,
239 .hdisplay = 240,
240 .hsync_start = 240 + 38,
241 .hsync_end = 240 + 38 + 10,
242 .htotal = 240 + 38 + 10 + 10,
243 .vdisplay = 320,
244 .vsync_start = 320 + 8,
245 .vsync_end = 320 + 8 + 4,
246 .vtotal = 320 + 8 + 4 + 4,
247 .width_mm = 61,
248 .height_mm = 103,
249 .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
250 };
251
252 static const struct drm_display_mode t28cp45tn89_mode = {
253 .clock = 6008,
254 .hdisplay = 240,
255 .hsync_start = 240 + 38,
256 .hsync_end = 240 + 38 + 10,
257 .htotal = 240 + 38 + 10 + 10,
258 .vdisplay = 320,
259 .vsync_start = 320 + 8,
260 .vsync_end = 320 + 8 + 4,
261 .vtotal = 320 + 8 + 4 + 4,
262 .width_mm = 43,
263 .height_mm = 57,
264 .flags = DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC,
265 };
266
267 static const struct drm_display_mode et028013dma_mode = {
268 .clock = 3000,
269 .hdisplay = 240,
270 .hsync_start = 240 + 38,
271 .hsync_end = 240 + 38 + 10,
272 .htotal = 240 + 38 + 10 + 10,
273 .vdisplay = 320,
274 .vsync_start = 320 + 8,
275 .vsync_end = 320 + 8 + 4,
276 .vtotal = 320 + 8 + 4 + 4,
277 .width_mm = 43,
278 .height_mm = 58,
279 .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
280 };
281
282 static const struct drm_display_mode jt240mhqs_hwt_ek_e3_mode = {
283 .clock = 6000,
284 .hdisplay = 240,
285 .hsync_start = 240 + 28,
286 .hsync_end = 240 + 28 + 10,
287 .htotal = 240 + 28 + 10 + 10,
288 .vdisplay = 280,
289 .vsync_start = 280 + 8,
290 .vsync_end = 280 + 8 + 4,
291 .vtotal = 280 + 8 + 4 + 4,
292 .width_mm = 43,
293 .height_mm = 37,
294 .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
295 };
296
297 static const struct st7789_panel_info default_panel = {
298 .mode = &default_mode,
299 .invert_mode = true,
300 .bus_format = MEDIA_BUS_FMT_RGB666_1X18,
301 .bus_flags = DRM_BUS_FLAG_DE_HIGH |
302 DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
303 };
304
305 static const struct st7789_panel_info t28cp45tn89_panel = {
306 .mode = &t28cp45tn89_mode,
307 .invert_mode = false,
308 .bus_format = MEDIA_BUS_FMT_RGB565_1X16,
309 .bus_flags = DRM_BUS_FLAG_DE_HIGH |
310 DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE,
311 };
312
313 static const struct st7789_panel_info et028013dma_panel = {
314 .mode = &et028013dma_mode,
315 .invert_mode = true,
316 .bus_format = MEDIA_BUS_FMT_RGB666_1X18,
317 .bus_flags = DRM_BUS_FLAG_DE_HIGH |
318 DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE,
319 };
320
321 static const struct st7789_panel_info jt240mhqs_hwt_ek_e3_panel = {
322 .mode = &jt240mhqs_hwt_ek_e3_mode,
323 .invert_mode = true,
324 .bus_format = MEDIA_BUS_FMT_RGB666_1X18,
325 .bus_flags = DRM_BUS_FLAG_DE_HIGH |
326 DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
327 .partial_mode = true,
328 .partial_start = 38,
329 .partial_end = 318,
330 };
331
st7789v_get_modes(struct drm_panel * panel,struct drm_connector * connector)332 static int st7789v_get_modes(struct drm_panel *panel,
333 struct drm_connector *connector)
334 {
335 struct st7789v *ctx = panel_to_st7789v(panel);
336 struct drm_display_mode *mode;
337
338 mode = drm_mode_duplicate(connector->dev, ctx->info->mode);
339 if (!mode) {
340 dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
341 ctx->info->mode->hdisplay, ctx->info->mode->vdisplay,
342 drm_mode_vrefresh(ctx->info->mode));
343 return -ENOMEM;
344 }
345
346 drm_mode_set_name(mode);
347
348 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
349 drm_mode_probed_add(connector, mode);
350
351 connector->display_info.bpc = 6;
352 connector->display_info.width_mm = ctx->info->mode->width_mm;
353 connector->display_info.height_mm = ctx->info->mode->height_mm;
354 connector->display_info.bus_flags = ctx->info->bus_flags;
355 drm_display_info_set_bus_formats(&connector->display_info,
356 &ctx->info->bus_format, 1);
357
358 /*
359 * TODO: Remove once all drm drivers call
360 * drm_connector_set_orientation_from_panel()
361 */
362 drm_connector_set_panel_orientation(connector, ctx->orientation);
363
364 return 1;
365 }
366
st7789v_get_orientation(struct drm_panel * p)367 static enum drm_panel_orientation st7789v_get_orientation(struct drm_panel *p)
368 {
369 struct st7789v *ctx = panel_to_st7789v(p);
370
371 return ctx->orientation;
372 }
373
st7789v_prepare(struct drm_panel * panel)374 static int st7789v_prepare(struct drm_panel *panel)
375 {
376 struct st7789v *ctx = panel_to_st7789v(panel);
377 u8 mode, pixel_fmt, polarity;
378 int ret;
379
380 if (!ctx->info->partial_mode)
381 mode = ST7789V_RGBCTRL_WO;
382 else
383 mode = 0;
384
385 switch (ctx->info->bus_format) {
386 case MEDIA_BUS_FMT_RGB666_1X18:
387 pixel_fmt = MIPI_DCS_PIXEL_FMT_18BIT;
388 break;
389 case MEDIA_BUS_FMT_RGB565_1X16:
390 pixel_fmt = MIPI_DCS_PIXEL_FMT_16BIT;
391 break;
392 default:
393 dev_err(panel->dev, "unsupported bus format: %d\n",
394 ctx->info->bus_format);
395 return -EINVAL;
396 }
397
398 pixel_fmt = (pixel_fmt << 4) | pixel_fmt;
399
400 polarity = 0;
401 if (ctx->info->mode->flags & DRM_MODE_FLAG_PVSYNC)
402 polarity |= ST7789V_RGBCTRL_VSYNC_HIGH;
403 if (ctx->info->mode->flags & DRM_MODE_FLAG_PHSYNC)
404 polarity |= ST7789V_RGBCTRL_HSYNC_HIGH;
405 if (ctx->info->bus_flags & DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE)
406 polarity |= ST7789V_RGBCTRL_PCLK_FALLING;
407 if (ctx->info->bus_flags & DRM_BUS_FLAG_DE_LOW)
408 polarity |= ST7789V_RGBCTRL_DE_LOW;
409
410 ret = regulator_enable(ctx->power);
411 if (ret)
412 return ret;
413
414 gpiod_set_value(ctx->reset, 1);
415 msleep(30);
416 gpiod_set_value(ctx->reset, 0);
417 msleep(120);
418
419 /*
420 * Avoid failing if the IDs are invalid in case the Rx bus width
421 * description is missing.
422 */
423 ret = st7789v_check_id(panel);
424 if (ret)
425 dev_warn(panel->dev, "Unrecognized panel IDs");
426
427 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE));
428
429 /* We need to wait 120ms after a sleep out command */
430 msleep(120);
431
432 ST7789V_TEST(ret, st7789v_write_command(ctx,
433 MIPI_DCS_SET_ADDRESS_MODE));
434 ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
435
436 ST7789V_TEST(ret, st7789v_write_command(ctx,
437 MIPI_DCS_SET_PIXEL_FORMAT));
438 ST7789V_TEST(ret, st7789v_write_data(ctx, pixel_fmt));
439
440 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD));
441 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
442 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
443 ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
444 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) |
445 ST7789V_PORCTRL_IDLE_FP(3)));
446 ST7789V_TEST(ret, st7789v_write_data(ctx,
447 ST7789V_PORCTRL_PARTIAL_BP(3) |
448 ST7789V_PORCTRL_PARTIAL_FP(3)));
449
450 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD));
451 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) |
452 ST7789V_GCTRL_VGHS(3)));
453
454 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD));
455 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b));
456
457 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD));
458 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH |
459 ST7789V_LCMCTRL_XMX |
460 ST7789V_LCMCTRL_XBGR));
461
462 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD));
463 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN));
464
465 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD));
466 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
467
468 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD));
469 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20));
470
471 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD));
472 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
473
474 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD));
475 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC));
476 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) |
477 ST7789V_PWCTRL1_AVCL(2) |
478 ST7789V_PWCTRL1_VDS(1)));
479
480 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD));
481 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd)));
482 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca)));
483 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe)));
484 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8)));
485 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9)));
486 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7)));
487 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d)));
488 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) |
489 ST7789V_PVGAMCTRL_VP36(3)));
490 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d)));
491 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) |
492 ST7789V_PVGAMCTRL_VP50(4)));
493 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa)));
494 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa)));
495 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b)));
496 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28)));
497
498 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD));
499 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd)));
500 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca)));
501 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf)));
502 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8)));
503 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8)));
504 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7)));
505 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e)));
506 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) |
507 ST7789V_NVGAMCTRL_VN36(5)));
508 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40)));
509 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) |
510 ST7789V_NVGAMCTRL_VN50(4)));
511 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9)));
512 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb)));
513 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b)));
514 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28)));
515
516 if (ctx->info->invert_mode) {
517 ST7789V_TEST(ret, st7789v_write_command(ctx,
518 MIPI_DCS_ENTER_INVERT_MODE));
519 } else {
520 ST7789V_TEST(ret, st7789v_write_command(ctx,
521 MIPI_DCS_EXIT_INVERT_MODE));
522 }
523
524 if (ctx->info->partial_mode) {
525 u8 area_data[4] = {
526 (ctx->info->partial_start >> 8) & 0xff,
527 (ctx->info->partial_start >> 0) & 0xff,
528 ((ctx->info->partial_end - 1) >> 8) & 0xff,
529 ((ctx->info->partial_end - 1) >> 0) & 0xff,
530 };
531
532 /* Caution: if userspace ever pushes a mode different from the
533 * expected one (i.e., the one advertised by get_modes), we'll
534 * add margins.
535 */
536
537 ST7789V_TEST(ret, st7789v_write_command(
538 ctx, MIPI_DCS_ENTER_PARTIAL_MODE));
539
540 ST7789V_TEST(ret, st7789v_write_command(
541 ctx, MIPI_DCS_SET_PAGE_ADDRESS));
542 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[0]));
543 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[1]));
544 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[2]));
545 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[3]));
546
547 ST7789V_TEST(ret, st7789v_write_command(
548 ctx, MIPI_DCS_SET_PARTIAL_ROWS));
549 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[0]));
550 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[1]));
551 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[2]));
552 ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[3]));
553 }
554
555 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD));
556 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB |
557 ST7789V_RAMCTRL_RM_RGB));
558 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) |
559 ST7789V_RAMCTRL_MAGIC));
560
561 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));
562 ST7789V_TEST(ret, st7789v_write_data(ctx, mode |
563 ST7789V_RGBCTRL_RCM(2) |
564 polarity));
565 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));
566 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20)));
567
568 return 0;
569 }
570
st7789v_enable(struct drm_panel * panel)571 static int st7789v_enable(struct drm_panel *panel)
572 {
573 struct st7789v *ctx = panel_to_st7789v(panel);
574
575 return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON);
576 }
577
st7789v_disable(struct drm_panel * panel)578 static int st7789v_disable(struct drm_panel *panel)
579 {
580 struct st7789v *ctx = panel_to_st7789v(panel);
581 int ret;
582
583 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF));
584
585 return 0;
586 }
587
st7789v_unprepare(struct drm_panel * panel)588 static int st7789v_unprepare(struct drm_panel *panel)
589 {
590 struct st7789v *ctx = panel_to_st7789v(panel);
591 int ret;
592
593 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE));
594
595 regulator_disable(ctx->power);
596
597 return 0;
598 }
599
600 static const struct drm_panel_funcs st7789v_drm_funcs = {
601 .disable = st7789v_disable,
602 .enable = st7789v_enable,
603 .get_modes = st7789v_get_modes,
604 .get_orientation = st7789v_get_orientation,
605 .prepare = st7789v_prepare,
606 .unprepare = st7789v_unprepare,
607 };
608
st7789v_probe(struct spi_device * spi)609 static int st7789v_probe(struct spi_device *spi)
610 {
611 struct device *dev = &spi->dev;
612 struct st7789v *ctx;
613 int ret;
614
615 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
616 if (!ctx)
617 return -ENOMEM;
618
619 spi_set_drvdata(spi, ctx);
620 ctx->spi = spi;
621
622 spi->bits_per_word = 9;
623 ret = spi_setup(spi);
624 if (ret < 0)
625 return dev_err_probe(&spi->dev, ret, "Failed to setup spi\n");
626
627 ctx->info = device_get_match_data(&spi->dev);
628
629 drm_panel_init(&ctx->panel, dev, &st7789v_drm_funcs,
630 DRM_MODE_CONNECTOR_DPI);
631
632 ctx->power = devm_regulator_get(dev, "power");
633 ret = PTR_ERR_OR_ZERO(ctx->power);
634 if (ret)
635 return dev_err_probe(dev, ret, "Failed to get regulator\n");
636
637 ctx->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
638 ret = PTR_ERR_OR_ZERO(ctx->reset);
639 if (ret)
640 return dev_err_probe(dev, ret, "Failed to get reset line\n");
641
642 ret = drm_panel_of_backlight(&ctx->panel);
643 if (ret)
644 return dev_err_probe(dev, ret, "Failed to get backlight\n");
645
646 of_drm_get_panel_orientation(spi->dev.of_node, &ctx->orientation);
647
648 drm_panel_add(&ctx->panel);
649
650 return 0;
651 }
652
st7789v_remove(struct spi_device * spi)653 static void st7789v_remove(struct spi_device *spi)
654 {
655 struct st7789v *ctx = spi_get_drvdata(spi);
656
657 drm_panel_remove(&ctx->panel);
658 }
659
660 static const struct spi_device_id st7789v_spi_id[] = {
661 { "st7789v", (unsigned long) &default_panel },
662 { "t28cp45tn89-v17", (unsigned long) &t28cp45tn89_panel },
663 { "et028013dma", (unsigned long) &et028013dma_panel },
664 { "jt240mhqs-hwt-ek-e3", (unsigned long) &jt240mhqs_hwt_ek_e3_panel },
665 { }
666 };
667 MODULE_DEVICE_TABLE(spi, st7789v_spi_id);
668
669 static const struct of_device_id st7789v_of_match[] = {
670 { .compatible = "sitronix,st7789v", .data = &default_panel },
671 { .compatible = "inanbo,t28cp45tn89-v17", .data = &t28cp45tn89_panel },
672 { .compatible = "edt,et028013dma", .data = &et028013dma_panel },
673 { .compatible = "jasonic,jt240mhqs-hwt-ek-e3",
674 .data = &jt240mhqs_hwt_ek_e3_panel },
675 { }
676 };
677 MODULE_DEVICE_TABLE(of, st7789v_of_match);
678
679 static struct spi_driver st7789v_driver = {
680 .probe = st7789v_probe,
681 .remove = st7789v_remove,
682 .id_table = st7789v_spi_id,
683 .driver = {
684 .name = "st7789v",
685 .of_match_table = st7789v_of_match,
686 },
687 };
688 module_spi_driver(st7789v_driver);
689
690 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
691 MODULE_DESCRIPTION("Sitronix st7789v LCD Driver");
692 MODULE_LICENSE("GPL v2");
693
