1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Elida kd35t133 5.5" MIPI-DSI panel driver
4 * Copyright (C) 2020 Theobroma Systems Design und Consulting GmbH
5 *
6 * based on
7 *
8 * Rockteck jh057n00900 5.5" MIPI-DSI panel driver
9 * Copyright (C) Purism SPC 2019
10 */
11
12 #include <linux/delay.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/media-bus-format.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/regulator/consumer.h>
18
19 #include <video/display_timing.h>
20 #include <video/mipi_display.h>
21
22 #include <drm/drm_mipi_dsi.h>
23 #include <drm/drm_modes.h>
24 #include <drm/drm_panel.h>
25
26 /* Manufacturer specific Commands send via DSI */
27 #define KD35T133_CMD_INTERFACEMODECTRL 0xb0
28 #define KD35T133_CMD_FRAMERATECTRL 0xb1
29 #define KD35T133_CMD_DISPLAYINVERSIONCTRL 0xb4
30 #define KD35T133_CMD_DISPLAYFUNCTIONCTRL 0xb6
31 #define KD35T133_CMD_POWERCONTROL1 0xc0
32 #define KD35T133_CMD_POWERCONTROL2 0xc1
33 #define KD35T133_CMD_VCOMCONTROL 0xc5
34 #define KD35T133_CMD_POSITIVEGAMMA 0xe0
35 #define KD35T133_CMD_NEGATIVEGAMMA 0xe1
36 #define KD35T133_CMD_SETIMAGEFUNCTION 0xe9
37 #define KD35T133_CMD_ADJUSTCONTROL3 0xf7
38
39 struct kd35t133 {
40 struct device *dev;
41 struct drm_panel panel;
42 struct gpio_desc *reset_gpio;
43 struct regulator *vdd;
44 struct regulator *iovcc;
45 bool prepared;
46 };
47
panel_to_kd35t133(struct drm_panel * panel)48 static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
49 {
50 return container_of(panel, struct kd35t133, panel);
51 }
52
53 #define dsi_dcs_write_seq(dsi, cmd, seq...) do { \
54 static const u8 b[] = { cmd, seq }; \
55 int ret; \
56 ret = mipi_dsi_dcs_write_buffer(dsi, b, ARRAY_SIZE(b)); \
57 if (ret < 0) \
58 return ret; \
59 } while (0)
60
kd35t133_init_sequence(struct kd35t133 * ctx)61 static int kd35t133_init_sequence(struct kd35t133 *ctx)
62 {
63 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
64 struct device *dev = ctx->dev;
65
66 /*
67 * Init sequence was supplied by the panel vendor with minimal
68 * documentation.
69 */
70 dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
71 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
72 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
73 dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
74 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
75 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
76 dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
77 dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
78 dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
79 dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
80 dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
81 dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
82 dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
83 dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
84 dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
85 0x20, 0x02);
86 dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
87 dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
88 0xa9, 0x51, 0x2c, 0x82);
89 mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
90
91 dev_dbg(dev, "Panel init sequence done\n");
92 return 0;
93 }
94
kd35t133_unprepare(struct drm_panel * panel)95 static int kd35t133_unprepare(struct drm_panel *panel)
96 {
97 struct kd35t133 *ctx = panel_to_kd35t133(panel);
98 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
99 int ret;
100
101 if (!ctx->prepared)
102 return 0;
103
104 ret = mipi_dsi_dcs_set_display_off(dsi);
105 if (ret < 0)
106 dev_err(ctx->dev, "failed to set display off: %d\n", ret);
107
108 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
109 if (ret < 0) {
110 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
111 return ret;
112 }
113
114 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
115
116 regulator_disable(ctx->iovcc);
117 regulator_disable(ctx->vdd);
118
119 ctx->prepared = false;
120
121 return 0;
122 }
123
kd35t133_prepare(struct drm_panel * panel)124 static int kd35t133_prepare(struct drm_panel *panel)
125 {
126 struct kd35t133 *ctx = panel_to_kd35t133(panel);
127 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
128 int ret;
129
130 if (ctx->prepared)
131 return 0;
132
133 dev_dbg(ctx->dev, "Resetting the panel\n");
134 ret = regulator_enable(ctx->vdd);
135 if (ret < 0) {
136 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
137 return ret;
138 }
139
140 ret = regulator_enable(ctx->iovcc);
141 if (ret < 0) {
142 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
143 goto disable_vdd;
144 }
145
146 msleep(20);
147
148 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
149 usleep_range(10, 20);
150 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
151
152 msleep(20);
153
154 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
155 if (ret < 0) {
156 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
157 goto disable_iovcc;
158 }
159
160 msleep(250);
161
162 ret = kd35t133_init_sequence(ctx);
163 if (ret < 0) {
164 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
165 goto disable_iovcc;
166 }
167
168 ret = mipi_dsi_dcs_set_display_on(dsi);
169 if (ret < 0) {
170 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
171 goto disable_iovcc;
172 }
173
174 msleep(50);
175
176 ctx->prepared = true;
177
178 return 0;
179
180 disable_iovcc:
181 regulator_disable(ctx->iovcc);
182 disable_vdd:
183 regulator_disable(ctx->vdd);
184 return ret;
185 }
186
187 static const struct drm_display_mode default_mode = {
188 .hdisplay = 320,
189 .hsync_start = 320 + 130,
190 .hsync_end = 320 + 130 + 4,
191 .htotal = 320 + 130 + 4 + 130,
192 .vdisplay = 480,
193 .vsync_start = 480 + 2,
194 .vsync_end = 480 + 2 + 1,
195 .vtotal = 480 + 2 + 1 + 2,
196 .clock = 17000,
197 .width_mm = 42,
198 .height_mm = 82,
199 };
200
kd35t133_get_modes(struct drm_panel * panel,struct drm_connector * connector)201 static int kd35t133_get_modes(struct drm_panel *panel,
202 struct drm_connector *connector)
203 {
204 struct kd35t133 *ctx = panel_to_kd35t133(panel);
205 struct drm_display_mode *mode;
206
207 mode = drm_mode_duplicate(connector->dev, &default_mode);
208 if (!mode) {
209 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
210 default_mode.hdisplay, default_mode.vdisplay,
211 drm_mode_vrefresh(&default_mode));
212 return -ENOMEM;
213 }
214
215 drm_mode_set_name(mode);
216
217 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
218 connector->display_info.width_mm = mode->width_mm;
219 connector->display_info.height_mm = mode->height_mm;
220 drm_mode_probed_add(connector, mode);
221
222 return 1;
223 }
224
225 static const struct drm_panel_funcs kd35t133_funcs = {
226 .unprepare = kd35t133_unprepare,
227 .prepare = kd35t133_prepare,
228 .get_modes = kd35t133_get_modes,
229 };
230
kd35t133_probe(struct mipi_dsi_device * dsi)231 static int kd35t133_probe(struct mipi_dsi_device *dsi)
232 {
233 struct device *dev = &dsi->dev;
234 struct kd35t133 *ctx;
235 int ret;
236
237 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
238 if (!ctx)
239 return -ENOMEM;
240
241 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
242 if (IS_ERR(ctx->reset_gpio)) {
243 dev_err(dev, "cannot get reset gpio\n");
244 return PTR_ERR(ctx->reset_gpio);
245 }
246
247 ctx->vdd = devm_regulator_get(dev, "vdd");
248 if (IS_ERR(ctx->vdd)) {
249 ret = PTR_ERR(ctx->vdd);
250 if (ret != -EPROBE_DEFER)
251 dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
252 return ret;
253 }
254
255 ctx->iovcc = devm_regulator_get(dev, "iovcc");
256 if (IS_ERR(ctx->iovcc)) {
257 ret = PTR_ERR(ctx->iovcc);
258 if (ret != -EPROBE_DEFER)
259 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
260 return ret;
261 }
262
263 mipi_dsi_set_drvdata(dsi, ctx);
264
265 ctx->dev = dev;
266
267 dsi->lanes = 1;
268 dsi->format = MIPI_DSI_FMT_RGB888;
269 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
270 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET |
271 MIPI_DSI_CLOCK_NON_CONTINUOUS;
272
273 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
274 DRM_MODE_CONNECTOR_DSI);
275
276 ret = drm_panel_of_backlight(&ctx->panel);
277 if (ret)
278 return ret;
279
280 drm_panel_add(&ctx->panel);
281
282 ret = mipi_dsi_attach(dsi);
283 if (ret < 0) {
284 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
285 drm_panel_remove(&ctx->panel);
286 return ret;
287 }
288
289 return 0;
290 }
291
kd35t133_shutdown(struct mipi_dsi_device * dsi)292 static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
293 {
294 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
295 int ret;
296
297 ret = drm_panel_unprepare(&ctx->panel);
298 if (ret < 0)
299 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
300
301 ret = drm_panel_disable(&ctx->panel);
302 if (ret < 0)
303 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
304 }
305
kd35t133_remove(struct mipi_dsi_device * dsi)306 static int kd35t133_remove(struct mipi_dsi_device *dsi)
307 {
308 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
309 int ret;
310
311 kd35t133_shutdown(dsi);
312
313 ret = mipi_dsi_detach(dsi);
314 if (ret < 0)
315 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
316
317 drm_panel_remove(&ctx->panel);
318
319 return 0;
320 }
321
322 static const struct of_device_id kd35t133_of_match[] = {
323 { .compatible = "elida,kd35t133" },
324 { /* sentinel */ }
325 };
326 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
327
328 static struct mipi_dsi_driver kd35t133_driver = {
329 .driver = {
330 .name = "panel-elida-kd35t133",
331 .of_match_table = kd35t133_of_match,
332 },
333 .probe = kd35t133_probe,
334 .remove = kd35t133_remove,
335 .shutdown = kd35t133_shutdown,
336 };
337 module_mipi_dsi_driver(kd35t133_driver);
338
339 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
340 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
341 MODULE_LICENSE("GPL v2");
342