1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2017 Free Electrons
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>
12 #include <video/mipi_display.h>
14 #include <drm/drm_device.h>
15 #include <drm/drm_modes.h>
16 #include <drm/drm_panel.h>
18 #define ST7789V_RAMCTRL_CMD 0xb0
19 #define ST7789V_RAMCTRL_RM_RGB BIT(4)
20 #define ST7789V_RAMCTRL_DM_RGB BIT(0)
21 #define ST7789V_RAMCTRL_MAGIC (3 << 6)
22 #define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4)
24 #define ST7789V_RGBCTRL_CMD 0xb1
25 #define ST7789V_RGBCTRL_WO BIT(7)
26 #define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5)
27 #define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
28 #define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
29 #define ST7789V_RGBCTRL_PCLK_HIGH BIT(1)
30 #define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
31 #define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
33 #define ST7789V_PORCTRL_CMD 0xb2
34 #define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4)
35 #define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf)
36 #define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4)
37 #define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf)
39 #define ST7789V_GCTRL_CMD 0xb7
40 #define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4)
41 #define ST7789V_GCTRL_VGLS(n) ((n) & 7)
43 #define ST7789V_VCOMS_CMD 0xbb
45 #define ST7789V_LCMCTRL_CMD 0xc0
46 #define ST7789V_LCMCTRL_XBGR BIT(5)
47 #define ST7789V_LCMCTRL_XMX BIT(3)
48 #define ST7789V_LCMCTRL_XMH BIT(2)
50 #define ST7789V_VDVVRHEN_CMD 0xc2
51 #define ST7789V_VDVVRHEN_CMDEN BIT(0)
53 #define ST7789V_VRHS_CMD 0xc3
55 #define ST7789V_VDVS_CMD 0xc4
57 #define ST7789V_FRCTRL2_CMD 0xc6
59 #define ST7789V_PWCTRL1_CMD 0xd0
60 #define ST7789V_PWCTRL1_MAGIC 0xa4
61 #define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6)
62 #define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4)
63 #define ST7789V_PWCTRL1_VDS(n) ((n) & 3)
65 #define ST7789V_PVGAMCTRL_CMD 0xe0
66 #define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4)
67 #define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4)
68 #define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf)
69 #define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f)
70 #define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f)
71 #define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f)
72 #define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f)
73 #define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf)
74 #define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f)
75 #define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7)
76 #define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4)
77 #define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f)
78 #define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf)
79 #define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f)
80 #define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f)
81 #define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f)
82 #define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f)
83 #define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4)
85 #define ST7789V_NVGAMCTRL_CMD 0xe1
86 #define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4)
87 #define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4)
88 #define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf)
89 #define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f)
90 #define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f)
91 #define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f)
92 #define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f)
93 #define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf)
94 #define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f)
95 #define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7)
96 #define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4)
97 #define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f)
98 #define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf)
99 #define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f)
100 #define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f)
101 #define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f)
102 #define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f)
103 #define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4)
105 #define ST7789V_TEST(val, func) \
107 if ((val = (func))) \
112 struct drm_panel panel;
113 struct spi_device *spi;
114 struct gpio_desc *reset;
115 struct regulator *power;
118 enum st7789v_prefix {
123 static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel)
125 return container_of(panel, struct st7789v, panel);
128 static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix,
131 struct spi_transfer xfer = { };
132 u16 txbuf = ((prefix & 1) << 8) | data;
134 xfer.tx_buf = &txbuf;
135 xfer.bits_per_word = 9;
136 xfer.len = sizeof(txbuf);
138 return spi_sync_transfer(ctx->spi, &xfer, 1);
141 static int st7789v_write_command(struct st7789v *ctx, u8 cmd)
143 return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd);
146 static int st7789v_write_data(struct st7789v *ctx, u8 cmd)
148 return st7789v_spi_write(ctx, ST7789V_DATA, cmd);
151 static const struct drm_display_mode default_mode = {
154 .hsync_start = 240 + 38,
155 .hsync_end = 240 + 38 + 10,
156 .htotal = 240 + 38 + 10 + 10,
158 .vsync_start = 320 + 8,
159 .vsync_end = 320 + 8 + 4,
160 .vtotal = 320 + 8 + 4 + 4,
163 static int st7789v_get_modes(struct drm_panel *panel,
164 struct drm_connector *connector)
166 struct drm_display_mode *mode;
168 mode = drm_mode_duplicate(connector->dev, &default_mode);
170 dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
171 default_mode.hdisplay, default_mode.vdisplay,
172 drm_mode_vrefresh(&default_mode));
176 drm_mode_set_name(mode);
178 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
179 drm_mode_probed_add(connector, mode);
181 connector->display_info.width_mm = 61;
182 connector->display_info.height_mm = 103;
187 static int st7789v_prepare(struct drm_panel *panel)
189 struct st7789v *ctx = panel_to_st7789v(panel);
192 ret = regulator_enable(ctx->power);
196 gpiod_set_value(ctx->reset, 1);
198 gpiod_set_value(ctx->reset, 0);
201 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE));
203 /* We need to wait 120ms after a sleep out command */
206 ST7789V_TEST(ret, st7789v_write_command(ctx,
207 MIPI_DCS_SET_ADDRESS_MODE));
208 ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
210 ST7789V_TEST(ret, st7789v_write_command(ctx,
211 MIPI_DCS_SET_PIXEL_FORMAT));
212 ST7789V_TEST(ret, st7789v_write_data(ctx,
213 (MIPI_DCS_PIXEL_FMT_18BIT << 4) |
214 (MIPI_DCS_PIXEL_FMT_18BIT)));
216 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD));
217 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
218 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
219 ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
220 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) |
221 ST7789V_PORCTRL_IDLE_FP(3)));
222 ST7789V_TEST(ret, st7789v_write_data(ctx,
223 ST7789V_PORCTRL_PARTIAL_BP(3) |
224 ST7789V_PORCTRL_PARTIAL_FP(3)));
226 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD));
227 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) |
228 ST7789V_GCTRL_VGHS(3)));
230 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD));
231 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b));
233 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD));
234 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH |
235 ST7789V_LCMCTRL_XMX |
236 ST7789V_LCMCTRL_XBGR));
238 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD));
239 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN));
241 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD));
242 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
244 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD));
245 ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20));
247 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD));
248 ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
250 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD));
251 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC));
252 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) |
253 ST7789V_PWCTRL1_AVCL(2) |
254 ST7789V_PWCTRL1_VDS(1)));
256 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD));
257 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd)));
258 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca)));
259 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe)));
260 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8)));
261 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9)));
262 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7)));
263 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d)));
264 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) |
265 ST7789V_PVGAMCTRL_VP36(3)));
266 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d)));
267 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) |
268 ST7789V_PVGAMCTRL_VP50(4)));
269 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa)));
270 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa)));
271 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b)));
272 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28)));
274 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD));
275 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd)));
276 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca)));
277 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf)));
278 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8)));
279 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8)));
280 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7)));
281 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e)));
282 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) |
283 ST7789V_NVGAMCTRL_VN36(5)));
284 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40)));
285 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) |
286 ST7789V_NVGAMCTRL_VN50(4)));
287 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9)));
288 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb)));
289 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b)));
290 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28)));
292 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_INVERT_MODE));
294 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD));
295 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB |
296 ST7789V_RAMCTRL_RM_RGB));
297 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) |
298 ST7789V_RAMCTRL_MAGIC));
300 ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));
301 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO |
302 ST7789V_RGBCTRL_RCM(2) |
303 ST7789V_RGBCTRL_VSYNC_HIGH |
304 ST7789V_RGBCTRL_HSYNC_HIGH |
305 ST7789V_RGBCTRL_PCLK_HIGH));
306 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));
307 ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20)));
312 static int st7789v_enable(struct drm_panel *panel)
314 struct st7789v *ctx = panel_to_st7789v(panel);
316 return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON);
319 static int st7789v_disable(struct drm_panel *panel)
321 struct st7789v *ctx = panel_to_st7789v(panel);
324 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF));
329 static int st7789v_unprepare(struct drm_panel *panel)
331 struct st7789v *ctx = panel_to_st7789v(panel);
334 ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE));
336 regulator_disable(ctx->power);
341 static const struct drm_panel_funcs st7789v_drm_funcs = {
342 .disable = st7789v_disable,
343 .enable = st7789v_enable,
344 .get_modes = st7789v_get_modes,
345 .prepare = st7789v_prepare,
346 .unprepare = st7789v_unprepare,
349 static int st7789v_probe(struct spi_device *spi)
351 struct device *dev = &spi->dev;
355 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
359 spi_set_drvdata(spi, ctx);
362 drm_panel_init(&ctx->panel, dev, &st7789v_drm_funcs,
363 DRM_MODE_CONNECTOR_DPI);
365 ctx->power = devm_regulator_get(dev, "power");
366 ret = PTR_ERR_OR_ZERO(ctx->power);
368 return dev_err_probe(dev, ret, "Failed to get regulator\n");
370 ctx->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
371 ret = PTR_ERR_OR_ZERO(ctx->reset);
373 return dev_err_probe(dev, ret, "Failed to get reset line\n");
375 ret = drm_panel_of_backlight(&ctx->panel);
377 return dev_err_probe(dev, ret, "Failed to get backlight\n");
379 drm_panel_add(&ctx->panel);
384 static void st7789v_remove(struct spi_device *spi)
386 struct st7789v *ctx = spi_get_drvdata(spi);
388 drm_panel_remove(&ctx->panel);
391 static const struct spi_device_id st7789v_spi_id[] = {
395 MODULE_DEVICE_TABLE(spi, st7789v_spi_id);
397 static const struct of_device_id st7789v_of_match[] = {
398 { .compatible = "sitronix,st7789v" },
401 MODULE_DEVICE_TABLE(of, st7789v_of_match);
403 static struct spi_driver st7789v_driver = {
404 .probe = st7789v_probe,
405 .remove = st7789v_remove,
406 .id_table = st7789v_spi_id,
409 .of_match_table = st7789v_of_match,
412 module_spi_driver(st7789v_driver);
414 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
415 MODULE_DESCRIPTION("Sitronix st7789v LCD Driver");
416 MODULE_LICENSE("GPL v2");