1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Elida kd35t133 3.5" 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 };
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
kd35t133_init_sequence(struct kd35t133 * ctx)53 static int kd35t133_init_sequence(struct kd35t133 *ctx)
54 {
55 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
56 struct device *dev = ctx->dev;
57
58 /*
59 * Init sequence was supplied by the panel vendor with minimal
60 * documentation.
61 */
62 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
63 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
64 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
65 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
66 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
67 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
68 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
69 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
70 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
71 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
72 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
73 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
74 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
75 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
76 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
77 0x20, 0x02);
78 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
79 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
80 0xa9, 0x51, 0x2c, 0x82);
81 mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
82
83 dev_dbg(dev, "Panel init sequence done\n");
84 return 0;
85 }
86
kd35t133_unprepare(struct drm_panel * panel)87 static int kd35t133_unprepare(struct drm_panel *panel)
88 {
89 struct kd35t133 *ctx = panel_to_kd35t133(panel);
90 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
91 int ret;
92
93 ret = mipi_dsi_dcs_set_display_off(dsi);
94 if (ret < 0)
95 dev_err(ctx->dev, "failed to set display off: %d\n", ret);
96
97 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
98 if (ret < 0) {
99 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
100 return ret;
101 }
102
103 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
104
105 regulator_disable(ctx->iovcc);
106 regulator_disable(ctx->vdd);
107
108 return 0;
109 }
110
kd35t133_prepare(struct drm_panel * panel)111 static int kd35t133_prepare(struct drm_panel *panel)
112 {
113 struct kd35t133 *ctx = panel_to_kd35t133(panel);
114 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
115 int ret;
116
117 dev_dbg(ctx->dev, "Resetting the panel\n");
118 ret = regulator_enable(ctx->vdd);
119 if (ret < 0) {
120 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
121 return ret;
122 }
123
124 ret = regulator_enable(ctx->iovcc);
125 if (ret < 0) {
126 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
127 goto disable_vdd;
128 }
129
130 msleep(20);
131
132 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
133 usleep_range(10, 20);
134 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
135
136 msleep(20);
137
138 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
139 if (ret < 0) {
140 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
141 goto disable_iovcc;
142 }
143
144 msleep(250);
145
146 ret = kd35t133_init_sequence(ctx);
147 if (ret < 0) {
148 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
149 goto disable_iovcc;
150 }
151
152 ret = mipi_dsi_dcs_set_display_on(dsi);
153 if (ret < 0) {
154 dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
155 goto disable_iovcc;
156 }
157
158 msleep(50);
159
160 return 0;
161
162 disable_iovcc:
163 regulator_disable(ctx->iovcc);
164 disable_vdd:
165 regulator_disable(ctx->vdd);
166 return ret;
167 }
168
169 static const struct drm_display_mode default_mode = {
170 .hdisplay = 320,
171 .hsync_start = 320 + 130,
172 .hsync_end = 320 + 130 + 4,
173 .htotal = 320 + 130 + 4 + 130,
174 .vdisplay = 480,
175 .vsync_start = 480 + 2,
176 .vsync_end = 480 + 2 + 1,
177 .vtotal = 480 + 2 + 1 + 2,
178 .clock = 17000,
179 .width_mm = 42,
180 .height_mm = 82,
181 };
182
kd35t133_get_modes(struct drm_panel * panel,struct drm_connector * connector)183 static int kd35t133_get_modes(struct drm_panel *panel,
184 struct drm_connector *connector)
185 {
186 struct kd35t133 *ctx = panel_to_kd35t133(panel);
187 struct drm_display_mode *mode;
188
189 mode = drm_mode_duplicate(connector->dev, &default_mode);
190 if (!mode) {
191 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
192 default_mode.hdisplay, default_mode.vdisplay,
193 drm_mode_vrefresh(&default_mode));
194 return -ENOMEM;
195 }
196
197 drm_mode_set_name(mode);
198
199 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
200 connector->display_info.width_mm = mode->width_mm;
201 connector->display_info.height_mm = mode->height_mm;
202 drm_mode_probed_add(connector, mode);
203
204 return 1;
205 }
206
kd35t133_get_orientation(struct drm_panel * panel)207 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
208 {
209 struct kd35t133 *ctx = panel_to_kd35t133(panel);
210
211 return ctx->orientation;
212 }
213
214 static const struct drm_panel_funcs kd35t133_funcs = {
215 .unprepare = kd35t133_unprepare,
216 .prepare = kd35t133_prepare,
217 .get_modes = kd35t133_get_modes,
218 .get_orientation = kd35t133_get_orientation,
219 };
220
kd35t133_probe(struct mipi_dsi_device * dsi)221 static int kd35t133_probe(struct mipi_dsi_device *dsi)
222 {
223 struct device *dev = &dsi->dev;
224 struct kd35t133 *ctx;
225 int ret;
226
227 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
228 if (!ctx)
229 return -ENOMEM;
230
231 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
232 if (IS_ERR(ctx->reset_gpio)) {
233 dev_err(dev, "cannot get reset gpio\n");
234 return PTR_ERR(ctx->reset_gpio);
235 }
236
237 ctx->vdd = devm_regulator_get(dev, "vdd");
238 if (IS_ERR(ctx->vdd)) {
239 ret = PTR_ERR(ctx->vdd);
240 if (ret != -EPROBE_DEFER)
241 dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
242 return ret;
243 }
244
245 ctx->iovcc = devm_regulator_get(dev, "iovcc");
246 if (IS_ERR(ctx->iovcc)) {
247 ret = PTR_ERR(ctx->iovcc);
248 if (ret != -EPROBE_DEFER)
249 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
250 return ret;
251 }
252
253 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
254 if (ret < 0) {
255 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
256 return ret;
257 }
258
259 mipi_dsi_set_drvdata(dsi, ctx);
260
261 ctx->dev = dev;
262
263 dsi->lanes = 1;
264 dsi->format = MIPI_DSI_FMT_RGB888;
265 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
266 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
267 MIPI_DSI_CLOCK_NON_CONTINUOUS;
268
269 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
270 DRM_MODE_CONNECTOR_DSI);
271
272 ret = drm_panel_of_backlight(&ctx->panel);
273 if (ret)
274 return ret;
275
276 drm_panel_add(&ctx->panel);
277
278 ret = mipi_dsi_attach(dsi);
279 if (ret < 0) {
280 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
281 drm_panel_remove(&ctx->panel);
282 return ret;
283 }
284
285 return 0;
286 }
287
kd35t133_remove(struct mipi_dsi_device * dsi)288 static void kd35t133_remove(struct mipi_dsi_device *dsi)
289 {
290 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
291 int ret;
292
293 ret = mipi_dsi_detach(dsi);
294 if (ret < 0)
295 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
296
297 drm_panel_remove(&ctx->panel);
298 }
299
300 static const struct of_device_id kd35t133_of_match[] = {
301 { .compatible = "elida,kd35t133" },
302 { /* sentinel */ }
303 };
304 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
305
306 static struct mipi_dsi_driver kd35t133_driver = {
307 .driver = {
308 .name = "panel-elida-kd35t133",
309 .of_match_table = kd35t133_of_match,
310 },
311 .probe = kd35t133_probe,
312 .remove = kd35t133_remove,
313 };
314 module_mipi_dsi_driver(kd35t133_driver);
315
316 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
317 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
318 MODULE_LICENSE("GPL v2");
319