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 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
116
117 regulator_disable(ctx->iovcc);
118 regulator_disable(ctx->vdd);
119
120 ctx->prepared = false;
121
122 return 0;
123 }
124
kd35t133_prepare(struct drm_panel * panel)125 static int kd35t133_prepare(struct drm_panel *panel)
126 {
127 struct kd35t133 *ctx = panel_to_kd35t133(panel);
128 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
129 int ret;
130
131 if (ctx->prepared)
132 return 0;
133
134 dev_dbg(ctx->dev, "Resetting the panel\n");
135 ret = regulator_enable(ctx->vdd);
136 if (ret < 0) {
137 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
138 return ret;
139 }
140
141 ret = regulator_enable(ctx->iovcc);
142 if (ret < 0) {
143 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
144 goto disable_vdd;
145 }
146
147 msleep(20);
148
149 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
150 usleep_range(10, 20);
151 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
152
153 msleep(20);
154
155 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
156 if (ret < 0) {
157 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
158 goto disable_iovcc;
159 }
160
161 msleep(250);
162
163 ret = kd35t133_init_sequence(ctx);
164 if (ret < 0) {
165 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
166 goto disable_iovcc;
167 }
168
169 ret = mipi_dsi_dcs_set_display_on(dsi);
170 if (ret < 0) {
171 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
172 goto disable_iovcc;
173 }
174
175 msleep(50);
176
177 ctx->prepared = true;
178
179 return 0;
180
181 disable_iovcc:
182 regulator_disable(ctx->iovcc);
183 disable_vdd:
184 regulator_disable(ctx->vdd);
185 return ret;
186 }
187
188 static const struct drm_display_mode default_mode = {
189 .hdisplay = 320,
190 .hsync_start = 320 + 130,
191 .hsync_end = 320 + 130 + 4,
192 .htotal = 320 + 130 + 4 + 130,
193 .vdisplay = 480,
194 .vsync_start = 480 + 2,
195 .vsync_end = 480 + 2 + 1,
196 .vtotal = 480 + 2 + 1 + 2,
197 .clock = 17000,
198 .width_mm = 42,
199 .height_mm = 82,
200 };
201
kd35t133_get_modes(struct drm_panel * panel,struct drm_connector * connector)202 static int kd35t133_get_modes(struct drm_panel *panel,
203 struct drm_connector *connector)
204 {
205 struct kd35t133 *ctx = panel_to_kd35t133(panel);
206 struct drm_display_mode *mode;
207
208 mode = drm_mode_duplicate(connector->dev, &default_mode);
209 if (!mode) {
210 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
211 default_mode.hdisplay, default_mode.vdisplay,
212 drm_mode_vrefresh(&default_mode));
213 return -ENOMEM;
214 }
215
216 drm_mode_set_name(mode);
217
218 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
219 connector->display_info.width_mm = mode->width_mm;
220 connector->display_info.height_mm = mode->height_mm;
221 drm_mode_probed_add(connector, mode);
222 drm_connector_set_panel_orientation(connector, ctx->orientation);
223
224 return 1;
225 }
226
227 static const struct drm_panel_funcs kd35t133_funcs = {
228 .unprepare = kd35t133_unprepare,
229 .prepare = kd35t133_prepare,
230 .get_modes = kd35t133_get_modes,
231 };
232
kd35t133_probe(struct mipi_dsi_device * dsi)233 static int kd35t133_probe(struct mipi_dsi_device *dsi)
234 {
235 struct device *dev = &dsi->dev;
236 struct kd35t133 *ctx;
237 int ret;
238
239 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
240 if (!ctx)
241 return -ENOMEM;
242
243 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
244 if (IS_ERR(ctx->reset_gpio)) {
245 dev_err(dev, "cannot get reset gpio\n");
246 return PTR_ERR(ctx->reset_gpio);
247 }
248
249 ctx->vdd = devm_regulator_get(dev, "vdd");
250 if (IS_ERR(ctx->vdd)) {
251 ret = PTR_ERR(ctx->vdd);
252 if (ret != -EPROBE_DEFER)
253 dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
254 return ret;
255 }
256
257 ctx->iovcc = devm_regulator_get(dev, "iovcc");
258 if (IS_ERR(ctx->iovcc)) {
259 ret = PTR_ERR(ctx->iovcc);
260 if (ret != -EPROBE_DEFER)
261 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
262 return ret;
263 }
264
265 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
266 if (ret < 0) {
267 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
268 return ret;
269 }
270
271 mipi_dsi_set_drvdata(dsi, ctx);
272
273 ctx->dev = dev;
274
275 dsi->lanes = 1;
276 dsi->format = MIPI_DSI_FMT_RGB888;
277 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
278 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
279 MIPI_DSI_CLOCK_NON_CONTINUOUS;
280
281 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
282 DRM_MODE_CONNECTOR_DSI);
283
284 ret = drm_panel_of_backlight(&ctx->panel);
285 if (ret)
286 return ret;
287
288 drm_panel_add(&ctx->panel);
289
290 ret = mipi_dsi_attach(dsi);
291 if (ret < 0) {
292 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
293 drm_panel_remove(&ctx->panel);
294 return ret;
295 }
296
297 return 0;
298 }
299
kd35t133_shutdown(struct mipi_dsi_device * dsi)300 static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
301 {
302 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
303 int ret;
304
305 ret = drm_panel_unprepare(&ctx->panel);
306 if (ret < 0)
307 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
308
309 ret = drm_panel_disable(&ctx->panel);
310 if (ret < 0)
311 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
312 }
313
kd35t133_remove(struct mipi_dsi_device * dsi)314 static int kd35t133_remove(struct mipi_dsi_device *dsi)
315 {
316 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
317 int ret;
318
319 kd35t133_shutdown(dsi);
320
321 ret = mipi_dsi_detach(dsi);
322 if (ret < 0)
323 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
324
325 drm_panel_remove(&ctx->panel);
326
327 return 0;
328 }
329
330 static const struct of_device_id kd35t133_of_match[] = {
331 { .compatible = "elida,kd35t133" },
332 { /* sentinel */ }
333 };
334 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
335
336 static struct mipi_dsi_driver kd35t133_driver = {
337 .driver = {
338 .name = "panel-elida-kd35t133",
339 .of_match_table = kd35t133_of_match,
340 },
341 .probe = kd35t133_probe,
342 .remove = kd35t133_remove,
343 .shutdown = kd35t133_shutdown,
344 };
345 module_mipi_dsi_driver(kd35t133_driver);
346
347 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
348 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
349 MODULE_LICENSE("GPL v2");
350