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linux
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
39struct 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
49static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
50{
51 return container_of(panel, struct kd35t133, panel);
52}
53
54static 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
88static 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 regulator_disable(ctx->iovcc);
108 regulator_disable(ctx->vdd);
109
110 ctx->prepared = false;
111
112 return 0;
113}
114
115static int kd35t133_prepare(struct drm_panel *panel)
116{
117 struct kd35t133 *ctx = panel_to_kd35t133(panel);
118 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
119 int ret;
120
121 if (ctx->prepared)
122 return 0;
123
124 dev_dbg(ctx->dev, "Resetting the panel\n");
125 ret = regulator_enable(ctx->vdd);
126 if (ret < 0) {
127 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
128 return ret;
129 }
130
131 ret = regulator_enable(ctx->iovcc);
132 if (ret < 0) {
133 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
134 goto disable_vdd;
135 }
136
137 msleep(20);
138
139 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
140 usleep_range(10, 20);
141 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
142
143 msleep(20);
144
145 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
146 if (ret < 0) {
147 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
148 goto disable_iovcc;
149 }
150
151 msleep(250);
152
153 ret = kd35t133_init_sequence(ctx);
154 if (ret < 0) {
155 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
156 goto disable_iovcc;
157 }
158
159 ret = mipi_dsi_dcs_set_display_on(dsi);
160 if (ret < 0) {
161 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
162 goto disable_iovcc;
163 }
164
165 msleep(50);
166
167 ctx->prepared = true;
168
169 return 0;
170
171disable_iovcc:
172 regulator_disable(ctx->iovcc);
173disable_vdd:
174 regulator_disable(ctx->vdd);
175 return ret;
176}
177
178static const struct drm_display_mode default_mode = {
179 .hdisplay = 320,
180 .hsync_start = 320 + 130,
181 .hsync_end = 320 + 130 + 4,
182 .htotal = 320 + 130 + 4 + 130,
183 .vdisplay = 480,
184 .vsync_start = 480 + 2,
185 .vsync_end = 480 + 2 + 1,
186 .vtotal = 480 + 2 + 1 + 2,
187 .clock = 17000,
188 .width_mm = 42,
189 .height_mm = 82,
190};
191
192static int kd35t133_get_modes(struct drm_panel *panel,
193 struct drm_connector *connector)
194{
195 struct kd35t133 *ctx = panel_to_kd35t133(panel);
196 struct drm_display_mode *mode;
197
198 mode = drm_mode_duplicate(connector->dev, &default_mode);
199 if (!mode) {
200 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
201 default_mode.hdisplay, default_mode.vdisplay,
202 drm_mode_vrefresh(&default_mode));
203 return -ENOMEM;
204 }
205
206 drm_mode_set_name(mode);
207
208 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
209 connector->display_info.width_mm = mode->width_mm;
210 connector->display_info.height_mm = mode->height_mm;
211 drm_mode_probed_add(connector, mode);
212 /*
213 * TODO: Remove once all drm drivers call
214 * drm_connector_set_orientation_from_panel()
215 */
216 drm_connector_set_panel_orientation(connector, ctx->orientation);
217
218 return 1;
219}
220
221static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
222{
223 struct kd35t133 *ctx = panel_to_kd35t133(panel);
224
225 return ctx->orientation;
226}
227
228static const struct drm_panel_funcs kd35t133_funcs = {
229 .unprepare = kd35t133_unprepare,
230 .prepare = kd35t133_prepare,
231 .get_modes = kd35t133_get_modes,
232 .get_orientation = kd35t133_get_orientation,
233};
234
235static int kd35t133_probe(struct mipi_dsi_device *dsi)
236{
237 struct device *dev = &dsi->dev;
238 struct kd35t133 *ctx;
239 int ret;
240
241 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
242 if (!ctx)
243 return -ENOMEM;
244
245 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
246 if (IS_ERR(ctx->reset_gpio)) {
247 dev_err(dev, "cannot get reset gpio\n");
248 return PTR_ERR(ctx->reset_gpio);
249 }
250
251 ctx->vdd = devm_regulator_get(dev, "vdd");
252 if (IS_ERR(ctx->vdd)) {
253 ret = PTR_ERR(ctx->vdd);
254 if (ret != -EPROBE_DEFER)
255 dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
256 return ret;
257 }
258
259 ctx->iovcc = devm_regulator_get(dev, "iovcc");
260 if (IS_ERR(ctx->iovcc)) {
261 ret = PTR_ERR(ctx->iovcc);
262 if (ret != -EPROBE_DEFER)
263 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
264 return ret;
265 }
266
267 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
268 if (ret < 0) {
269 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
270 return ret;
271 }
272
273 mipi_dsi_set_drvdata(dsi, ctx);
274
275 ctx->dev = dev;
276
277 dsi->lanes = 1;
278 dsi->format = MIPI_DSI_FMT_RGB888;
279 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
280 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
281 MIPI_DSI_CLOCK_NON_CONTINUOUS;
282
283 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
284 DRM_MODE_CONNECTOR_DSI);
285
286 ret = drm_panel_of_backlight(&ctx->panel);
287 if (ret)
288 return ret;
289
290 drm_panel_add(&ctx->panel);
291
292 ret = mipi_dsi_attach(dsi);
293 if (ret < 0) {
294 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
295 drm_panel_remove(&ctx->panel);
296 return ret;
297 }
298
299 return 0;
300}
301
302static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
303{
304 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
305 int ret;
306
307 ret = drm_panel_unprepare(&ctx->panel);
308 if (ret < 0)
309 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
310
311 ret = drm_panel_disable(&ctx->panel);
312 if (ret < 0)
313 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
314}
315
316static void kd35t133_remove(struct mipi_dsi_device *dsi)
317{
318 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
319 int ret;
320
321 kd35t133_shutdown(dsi);
322
323 ret = mipi_dsi_detach(dsi);
324 if (ret < 0)
325 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
326
327 drm_panel_remove(&ctx->panel);
328}
329
330static const struct of_device_id kd35t133_of_match[] = {
331 { .compatible = "elida,kd35t133" },
332 { /* sentinel */ }
333};
334MODULE_DEVICE_TABLE(of, kd35t133_of_match);
335
336static 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};
345module_mipi_dsi_driver(kd35t133_driver);
346
347MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
348MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
349MODULE_LICENSE("GPL v2");