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 enum drm_panel_orientation orientation;
46 bool prepared;
47 };
48
panel_to_kd35t133(struct drm_panel * panel)49 static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
50 {
51 return container_of(panel, struct kd35t133, panel);
52 }
53
54 #define dsi_dcs_write_seq(dsi, cmd, seq...) do { \
55 static const u8 b[] = { cmd, seq }; \
56 int ret; \
57 ret = mipi_dsi_dcs_write_buffer(dsi, b, ARRAY_SIZE(b)); \
58 if (ret < 0) \
59 return ret; \
60 } while (0)
61
kd35t133_init_sequence(struct kd35t133 * ctx)62 static int kd35t133_init_sequence(struct kd35t133 *ctx)
63 {
64 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
65 struct device *dev = ctx->dev;
66
67 /*
68 * Init sequence was supplied by the panel vendor with minimal
69 * documentation.
70 */
71 dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
72 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
73 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
74 dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
75 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
76 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
77 dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
78 dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
79 dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
80 dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
81 dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
82 dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
83 dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
84 dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
85 dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
86 0x20, 0x02);
87 dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
88 dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
89 0xa9, 0x51, 0x2c, 0x82);
90 mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
91
92 dev_dbg(dev, "Panel init sequence done\n");
93 return 0;
94 }
95
kd35t133_unprepare(struct drm_panel * panel)96 static int kd35t133_unprepare(struct drm_panel *panel)
97 {
98 struct kd35t133 *ctx = panel_to_kd35t133(panel);
99 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
100 int ret;
101
102 if (!ctx->prepared)
103 return 0;
104
105 ret = mipi_dsi_dcs_set_display_off(dsi);
106 if (ret < 0)
107 dev_err(ctx->dev, "failed to set display off: %d\n", ret);
108
109 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
110 if (ret < 0) {
111 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
112 return ret;
113 }
114
115 regulator_disable(ctx->iovcc);
116 regulator_disable(ctx->vdd);
117
118 ctx->prepared = false;
119
120 return 0;
121 }
122
kd35t133_prepare(struct drm_panel * panel)123 static int kd35t133_prepare(struct drm_panel *panel)
124 {
125 struct kd35t133 *ctx = panel_to_kd35t133(panel);
126 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
127 int ret;
128
129 if (ctx->prepared)
130 return 0;
131
132 dev_dbg(ctx->dev, "Resetting the panel\n");
133 ret = regulator_enable(ctx->vdd);
134 if (ret < 0) {
135 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
136 return ret;
137 }
138
139 ret = regulator_enable(ctx->iovcc);
140 if (ret < 0) {
141 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
142 goto disable_vdd;
143 }
144
145 msleep(20);
146
147 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
148 usleep_range(10, 20);
149 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
150
151 msleep(20);
152
153 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
154 if (ret < 0) {
155 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
156 goto disable_iovcc;
157 }
158
159 msleep(250);
160
161 ret = kd35t133_init_sequence(ctx);
162 if (ret < 0) {
163 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
164 goto disable_iovcc;
165 }
166
167 ret = mipi_dsi_dcs_set_display_on(dsi);
168 if (ret < 0) {
169 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
170 goto disable_iovcc;
171 }
172
173 msleep(50);
174
175 ctx->prepared = true;
176
177 return 0;
178
179 disable_iovcc:
180 regulator_disable(ctx->iovcc);
181 disable_vdd:
182 regulator_disable(ctx->vdd);
183 return ret;
184 }
185
186 static const struct drm_display_mode default_mode = {
187 .hdisplay = 320,
188 .hsync_start = 320 + 130,
189 .hsync_end = 320 + 130 + 4,
190 .htotal = 320 + 130 + 4 + 130,
191 .vdisplay = 480,
192 .vsync_start = 480 + 2,
193 .vsync_end = 480 + 2 + 1,
194 .vtotal = 480 + 2 + 1 + 2,
195 .clock = 17000,
196 .width_mm = 42,
197 .height_mm = 82,
198 };
199
kd35t133_get_modes(struct drm_panel * panel,struct drm_connector * connector)200 static int kd35t133_get_modes(struct drm_panel *panel,
201 struct drm_connector *connector)
202 {
203 struct kd35t133 *ctx = panel_to_kd35t133(panel);
204 struct drm_display_mode *mode;
205
206 mode = drm_mode_duplicate(connector->dev, &default_mode);
207 if (!mode) {
208 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
209 default_mode.hdisplay, default_mode.vdisplay,
210 drm_mode_vrefresh(&default_mode));
211 return -ENOMEM;
212 }
213
214 drm_mode_set_name(mode);
215
216 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
217 connector->display_info.width_mm = mode->width_mm;
218 connector->display_info.height_mm = mode->height_mm;
219 drm_mode_probed_add(connector, mode);
220 /*
221 * TODO: Remove once all drm drivers call
222 * drm_connector_set_orientation_from_panel()
223 */
224 drm_connector_set_panel_orientation(connector, ctx->orientation);
225
226 return 1;
227 }
228
kd35t133_get_orientation(struct drm_panel * panel)229 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
230 {
231 struct kd35t133 *ctx = panel_to_kd35t133(panel);
232
233 return ctx->orientation;
234 }
235
236 static const struct drm_panel_funcs kd35t133_funcs = {
237 .unprepare = kd35t133_unprepare,
238 .prepare = kd35t133_prepare,
239 .get_modes = kd35t133_get_modes,
240 .get_orientation = kd35t133_get_orientation,
241 };
242
kd35t133_probe(struct mipi_dsi_device * dsi)243 static int kd35t133_probe(struct mipi_dsi_device *dsi)
244 {
245 struct device *dev = &dsi->dev;
246 struct kd35t133 *ctx;
247 int ret;
248
249 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
250 if (!ctx)
251 return -ENOMEM;
252
253 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
254 if (IS_ERR(ctx->reset_gpio)) {
255 dev_err(dev, "cannot get reset gpio\n");
256 return PTR_ERR(ctx->reset_gpio);
257 }
258
259 ctx->vdd = devm_regulator_get(dev, "vdd");
260 if (IS_ERR(ctx->vdd)) {
261 ret = PTR_ERR(ctx->vdd);
262 if (ret != -EPROBE_DEFER)
263 dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
264 return ret;
265 }
266
267 ctx->iovcc = devm_regulator_get(dev, "iovcc");
268 if (IS_ERR(ctx->iovcc)) {
269 ret = PTR_ERR(ctx->iovcc);
270 if (ret != -EPROBE_DEFER)
271 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
272 return ret;
273 }
274
275 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
276 if (ret < 0) {
277 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
278 return ret;
279 }
280
281 mipi_dsi_set_drvdata(dsi, ctx);
282
283 ctx->dev = dev;
284
285 dsi->lanes = 1;
286 dsi->format = MIPI_DSI_FMT_RGB888;
287 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
288 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
289 MIPI_DSI_CLOCK_NON_CONTINUOUS;
290
291 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
292 DRM_MODE_CONNECTOR_DSI);
293
294 ret = drm_panel_of_backlight(&ctx->panel);
295 if (ret)
296 return ret;
297
298 drm_panel_add(&ctx->panel);
299
300 ret = mipi_dsi_attach(dsi);
301 if (ret < 0) {
302 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
303 drm_panel_remove(&ctx->panel);
304 return ret;
305 }
306
307 return 0;
308 }
309
kd35t133_shutdown(struct mipi_dsi_device * dsi)310 static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
311 {
312 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
313 int ret;
314
315 ret = drm_panel_unprepare(&ctx->panel);
316 if (ret < 0)
317 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
318
319 ret = drm_panel_disable(&ctx->panel);
320 if (ret < 0)
321 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
322 }
323
kd35t133_remove(struct mipi_dsi_device * dsi)324 static void kd35t133_remove(struct mipi_dsi_device *dsi)
325 {
326 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
327 int ret;
328
329 kd35t133_shutdown(dsi);
330
331 ret = mipi_dsi_detach(dsi);
332 if (ret < 0)
333 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
334
335 drm_panel_remove(&ctx->panel);
336 }
337
338 static const struct of_device_id kd35t133_of_match[] = {
339 { .compatible = "elida,kd35t133" },
340 { /* sentinel */ }
341 };
342 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
343
344 static struct mipi_dsi_driver kd35t133_driver = {
345 .driver = {
346 .name = "panel-elida-kd35t133",
347 .of_match_table = kd35t133_of_match,
348 },
349 .probe = kd35t133_probe,
350 .remove = kd35t133_remove,
351 .shutdown = kd35t133_shutdown,
352 };
353 module_mipi_dsi_driver(kd35t133_driver);
354
355 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
356 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
357 MODULE_LICENSE("GPL v2");
358