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 | |
48 | static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel) |
49 | { |
50 | return container_of(panel, struct kd35t133, panel); |
51 | } |
52 | |
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, cmd: MIPI_DCS_ENTER_INVERT_MODE, NULL, len: 0); |
82 | |
83 | dev_dbg(dev, "Panel init sequence done\n" ); |
84 | return 0; |
85 | } |
86 | |
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(desc: ctx->reset_gpio, value: 1); |
104 | |
105 | regulator_disable(regulator: ctx->iovcc); |
106 | regulator_disable(regulator: ctx->vdd); |
107 | |
108 | return 0; |
109 | } |
110 | |
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(regulator: 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(regulator: 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(msecs: 20); |
131 | |
132 | gpiod_set_value_cansleep(desc: ctx->reset_gpio, value: 1); |
133 | usleep_range(min: 10, max: 20); |
134 | gpiod_set_value_cansleep(desc: ctx->reset_gpio, value: 0); |
135 | |
136 | msleep(msecs: 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(msecs: 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(msecs: 50); |
159 | |
160 | return 0; |
161 | |
162 | disable_iovcc: |
163 | regulator_disable(regulator: ctx->iovcc); |
164 | disable_vdd: |
165 | regulator_disable(regulator: 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 | |
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(dev: connector->dev, mode: &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 | |
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 | |
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, size: sizeof(*ctx), GFP_KERNEL); |
228 | if (!ctx) |
229 | return -ENOMEM; |
230 | |
231 | ctx->reset_gpio = devm_gpiod_get_optional(dev, con_id: "reset" , flags: GPIOD_OUT_LOW); |
232 | if (IS_ERR(ptr: ctx->reset_gpio)) { |
233 | dev_err(dev, "cannot get reset gpio\n" ); |
234 | return PTR_ERR(ptr: ctx->reset_gpio); |
235 | } |
236 | |
237 | ctx->vdd = devm_regulator_get(dev, id: "vdd" ); |
238 | if (IS_ERR(ptr: ctx->vdd)) { |
239 | ret = PTR_ERR(ptr: 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, id: "iovcc" ); |
246 | if (IS_ERR(ptr: ctx->iovcc)) { |
247 | ret = PTR_ERR(ptr: 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(np: dev->of_node, orientation: &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, data: 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(panel: &ctx->panel, dev: &dsi->dev, funcs: &kd35t133_funcs, |
270 | DRM_MODE_CONNECTOR_DSI); |
271 | |
272 | ret = drm_panel_of_backlight(panel: &ctx->panel); |
273 | if (ret) |
274 | return ret; |
275 | |
276 | drm_panel_add(panel: &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(panel: &ctx->panel); |
282 | return ret; |
283 | } |
284 | |
285 | return 0; |
286 | } |
287 | |
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(panel: &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 | |