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 	bool prepared;
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 #define dsi_dcs_write_seq(dsi, cmd, seq...) do {			\
54 		static const u8 b[] = { cmd, seq };			\
55 		int ret;						\
56 		ret = mipi_dsi_dcs_write_buffer(dsi, b, ARRAY_SIZE(b));	\
57 		if (ret < 0)						\
58 			return ret;					\
59 	} while (0)
60 
61 static int kd35t133_init_sequence(struct kd35t133 *ctx)
62 {
63 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
64 	struct device *dev = ctx->dev;
65 
66 	/*
67 	 * Init sequence was supplied by the panel vendor with minimal
68 	 * documentation.
69 	 */
70 	dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
71 			  0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
72 			  0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
73 	dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
74 			  0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
75 			  0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
76 	dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
77 	dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
78 	dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
79 	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
80 	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
81 	dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
82 	dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
83 	dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
84 	dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
85 			  0x20, 0x02);
86 	dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
87 	dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
88 			  0xa9, 0x51, 0x2c, 0x82);
89 	mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
90 
91 	dev_dbg(dev, "Panel init sequence done\n");
92 	return 0;
93 }
94 
95 static int kd35t133_unprepare(struct drm_panel *panel)
96 {
97 	struct kd35t133 *ctx = panel_to_kd35t133(panel);
98 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
99 	int ret;
100 
101 	if (!ctx->prepared)
102 		return 0;
103 
104 	ret = mipi_dsi_dcs_set_display_off(dsi);
105 	if (ret < 0)
106 		dev_err(ctx->dev, "failed to set display off: %d\n", ret);
107 
108 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
109 	if (ret < 0) {
110 		dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
111 		return ret;
112 	}
113 
114 	regulator_disable(ctx->iovcc);
115 	regulator_disable(ctx->vdd);
116 
117 	ctx->prepared = false;
118 
119 	return 0;
120 }
121 
122 static int kd35t133_prepare(struct drm_panel *panel)
123 {
124 	struct kd35t133 *ctx = panel_to_kd35t133(panel);
125 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
126 	int ret;
127 
128 	if (ctx->prepared)
129 		return 0;
130 
131 	dev_dbg(ctx->dev, "Resetting the panel\n");
132 	ret = regulator_enable(ctx->vdd);
133 	if (ret < 0) {
134 		dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
135 		return ret;
136 	}
137 
138 	ret = regulator_enable(ctx->iovcc);
139 	if (ret < 0) {
140 		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
141 		goto disable_vdd;
142 	}
143 
144 	msleep(20);
145 
146 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
147 	usleep_range(10, 20);
148 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
149 
150 	msleep(20);
151 
152 	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
153 	if (ret < 0) {
154 		dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
155 		goto disable_iovcc;
156 	}
157 
158 	msleep(250);
159 
160 	ret = kd35t133_init_sequence(ctx);
161 	if (ret < 0) {
162 		dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
163 		goto disable_iovcc;
164 	}
165 
166 	ret = mipi_dsi_dcs_set_display_on(dsi);
167 	if (ret < 0) {
168 		dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
169 		goto disable_iovcc;
170 	}
171 
172 	msleep(50);
173 
174 	ctx->prepared = true;
175 
176 	return 0;
177 
178 disable_iovcc:
179 	regulator_disable(ctx->iovcc);
180 disable_vdd:
181 	regulator_disable(ctx->vdd);
182 	return ret;
183 }
184 
185 static const struct drm_display_mode default_mode = {
186 	.hdisplay	= 320,
187 	.hsync_start	= 320 + 130,
188 	.hsync_end	= 320 + 130 + 4,
189 	.htotal		= 320 + 130 + 4 + 130,
190 	.vdisplay	= 480,
191 	.vsync_start	= 480 + 2,
192 	.vsync_end	= 480 + 2 + 1,
193 	.vtotal		= 480 + 2 + 1 + 2,
194 	.clock		= 17000,
195 	.width_mm	= 42,
196 	.height_mm	= 82,
197 };
198 
199 static int kd35t133_get_modes(struct drm_panel *panel,
200 				struct drm_connector *connector)
201 {
202 	struct kd35t133 *ctx = panel_to_kd35t133(panel);
203 	struct drm_display_mode *mode;
204 
205 	mode = drm_mode_duplicate(connector->dev, &default_mode);
206 	if (!mode) {
207 		dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
208 			default_mode.hdisplay, default_mode.vdisplay,
209 			drm_mode_vrefresh(&default_mode));
210 		return -ENOMEM;
211 	}
212 
213 	drm_mode_set_name(mode);
214 
215 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
216 	connector->display_info.width_mm = mode->width_mm;
217 	connector->display_info.height_mm = mode->height_mm;
218 	drm_mode_probed_add(connector, mode);
219 
220 	return 1;
221 }
222 
223 static const struct drm_panel_funcs kd35t133_funcs = {
224 	.unprepare	= kd35t133_unprepare,
225 	.prepare	= kd35t133_prepare,
226 	.get_modes	= kd35t133_get_modes,
227 };
228 
229 static int kd35t133_probe(struct mipi_dsi_device *dsi)
230 {
231 	struct device *dev = &dsi->dev;
232 	struct kd35t133 *ctx;
233 	int ret;
234 
235 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
236 	if (!ctx)
237 		return -ENOMEM;
238 
239 	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
240 	if (IS_ERR(ctx->reset_gpio)) {
241 		dev_err(dev, "cannot get reset gpio\n");
242 		return PTR_ERR(ctx->reset_gpio);
243 	}
244 
245 	ctx->vdd = devm_regulator_get(dev, "vdd");
246 	if (IS_ERR(ctx->vdd)) {
247 		ret = PTR_ERR(ctx->vdd);
248 		if (ret != -EPROBE_DEFER)
249 			dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
250 		return ret;
251 	}
252 
253 	ctx->iovcc = devm_regulator_get(dev, "iovcc");
254 	if (IS_ERR(ctx->iovcc)) {
255 		ret = PTR_ERR(ctx->iovcc);
256 		if (ret != -EPROBE_DEFER)
257 			dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
258 		return ret;
259 	}
260 
261 	mipi_dsi_set_drvdata(dsi, ctx);
262 
263 	ctx->dev = dev;
264 
265 	dsi->lanes = 1;
266 	dsi->format = MIPI_DSI_FMT_RGB888;
267 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
268 			  MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET;
269 
270 	drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
271 		       DRM_MODE_CONNECTOR_DSI);
272 
273 	ret = drm_panel_of_backlight(&ctx->panel);
274 	if (ret)
275 		return ret;
276 
277 	drm_panel_add(&ctx->panel);
278 
279 	ret = mipi_dsi_attach(dsi);
280 	if (ret < 0) {
281 		dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
282 		drm_panel_remove(&ctx->panel);
283 		return ret;
284 	}
285 
286 	return 0;
287 }
288 
289 static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
290 {
291 	struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
292 	int ret;
293 
294 	ret = drm_panel_unprepare(&ctx->panel);
295 	if (ret < 0)
296 		dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
297 
298 	ret = drm_panel_disable(&ctx->panel);
299 	if (ret < 0)
300 		dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
301 }
302 
303 static int kd35t133_remove(struct mipi_dsi_device *dsi)
304 {
305 	struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
306 	int ret;
307 
308 	kd35t133_shutdown(dsi);
309 
310 	ret = mipi_dsi_detach(dsi);
311 	if (ret < 0)
312 		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
313 
314 	drm_panel_remove(&ctx->panel);
315 
316 	return 0;
317 }
318 
319 static const struct of_device_id kd35t133_of_match[] = {
320 	{ .compatible = "elida,kd35t133" },
321 	{ /* sentinel */ }
322 };
323 MODULE_DEVICE_TABLE(of, kd35t133_of_match);
324 
325 static struct mipi_dsi_driver kd35t133_driver = {
326 	.driver = {
327 		.name = "panel-elida-kd35t133",
328 		.of_match_table = kd35t133_of_match,
329 	},
330 	.probe	= kd35t133_probe,
331 	.remove = kd35t133_remove,
332 	.shutdown = kd35t133_shutdown,
333 };
334 module_mipi_dsi_driver(kd35t133_driver);
335 
336 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
337 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
338 MODULE_LICENSE("GPL v2");
339