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