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
 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
 62static 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
 96static 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	regulator_disable(ctx->iovcc);
116	regulator_disable(ctx->vdd);
117
118	ctx->prepared = false;
119
120	return 0;
121}
122
123static int kd35t133_prepare(struct drm_panel *panel)
124{
125	struct kd35t133 *ctx = panel_to_kd35t133(panel);
126	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
127	int ret;
128
129	if (ctx->prepared)
130		return 0;
131
132	dev_dbg(ctx->dev, "Resetting the panel\n");
133	ret = regulator_enable(ctx->vdd);
134	if (ret < 0) {
135		dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
136		return ret;
137	}
138
139	ret = regulator_enable(ctx->iovcc);
140	if (ret < 0) {
141		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
142		goto disable_vdd;
143	}
144
145	msleep(20);
146
147	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
148	usleep_range(10, 20);
149	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
150
151	msleep(20);
152
153	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
154	if (ret < 0) {
155		dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
156		goto disable_iovcc;
157	}
158
159	msleep(250);
160
161	ret = kd35t133_init_sequence(ctx);
162	if (ret < 0) {
163		dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
164		goto disable_iovcc;
165	}
166
167	ret = mipi_dsi_dcs_set_display_on(dsi);
168	if (ret < 0) {
169		dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
170		goto disable_iovcc;
171	}
172
173	msleep(50);
174
175	ctx->prepared = true;
176
177	return 0;
178
179disable_iovcc:
180	regulator_disable(ctx->iovcc);
181disable_vdd:
182	regulator_disable(ctx->vdd);
183	return ret;
184}
185
186static const struct drm_display_mode default_mode = {
187	.hdisplay	= 320,
188	.hsync_start	= 320 + 130,
189	.hsync_end	= 320 + 130 + 4,
190	.htotal		= 320 + 130 + 4 + 130,
191	.vdisplay	= 480,
192	.vsync_start	= 480 + 2,
193	.vsync_end	= 480 + 2 + 1,
194	.vtotal		= 480 + 2 + 1 + 2,
195	.clock		= 17000,
196	.width_mm	= 42,
197	.height_mm	= 82,
198};
199
200static int kd35t133_get_modes(struct drm_panel *panel,
201				struct drm_connector *connector)
202{
203	struct kd35t133 *ctx = panel_to_kd35t133(panel);
204	struct drm_display_mode *mode;
205
206	mode = drm_mode_duplicate(connector->dev, &default_mode);
207	if (!mode) {
208		dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
209			default_mode.hdisplay, default_mode.vdisplay,
210			drm_mode_vrefresh(&default_mode));
211		return -ENOMEM;
212	}
213
214	drm_mode_set_name(mode);
215
216	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
217	connector->display_info.width_mm = mode->width_mm;
218	connector->display_info.height_mm = mode->height_mm;
219	drm_mode_probed_add(connector, mode);
220	drm_connector_set_panel_orientation(connector, ctx->orientation);
221
222	return 1;
223}
224
225static const struct drm_panel_funcs kd35t133_funcs = {
226	.unprepare	= kd35t133_unprepare,
227	.prepare	= kd35t133_prepare,
228	.get_modes	= kd35t133_get_modes,
229};
230
231static int kd35t133_probe(struct mipi_dsi_device *dsi)
232{
233	struct device *dev = &dsi->dev;
234	struct kd35t133 *ctx;
235	int ret;
236
237	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
238	if (!ctx)
239		return -ENOMEM;
240
241	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
242	if (IS_ERR(ctx->reset_gpio)) {
243		dev_err(dev, "cannot get reset gpio\n");
244		return PTR_ERR(ctx->reset_gpio);
245	}
246
247	ctx->vdd = devm_regulator_get(dev, "vdd");
248	if (IS_ERR(ctx->vdd)) {
249		ret = PTR_ERR(ctx->vdd);
250		if (ret != -EPROBE_DEFER)
251			dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
252		return ret;
253	}
254
255	ctx->iovcc = devm_regulator_get(dev, "iovcc");
256	if (IS_ERR(ctx->iovcc)) {
257		ret = PTR_ERR(ctx->iovcc);
258		if (ret != -EPROBE_DEFER)
259			dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
260		return ret;
261	}
262
263	ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
264	if (ret < 0) {
265		dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
266		return ret;
267	}
268
269	mipi_dsi_set_drvdata(dsi, ctx);
270
271	ctx->dev = dev;
272
273	dsi->lanes = 1;
274	dsi->format = MIPI_DSI_FMT_RGB888;
275	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
276			  MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET |
277			  MIPI_DSI_CLOCK_NON_CONTINUOUS;
278
279	drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
280		       DRM_MODE_CONNECTOR_DSI);
281
282	ret = drm_panel_of_backlight(&ctx->panel);
283	if (ret)
284		return ret;
285
286	drm_panel_add(&ctx->panel);
287
288	ret = mipi_dsi_attach(dsi);
289	if (ret < 0) {
290		dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
291		drm_panel_remove(&ctx->panel);
292		return ret;
293	}
294
295	return 0;
296}
297
298static void kd35t133_shutdown(struct mipi_dsi_device *dsi)
299{
300	struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
301	int ret;
302
303	ret = drm_panel_unprepare(&ctx->panel);
304	if (ret < 0)
305		dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
306
307	ret = drm_panel_disable(&ctx->panel);
308	if (ret < 0)
309		dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
310}
311
312static int kd35t133_remove(struct mipi_dsi_device *dsi)
313{
314	struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
315	int ret;
316
317	kd35t133_shutdown(dsi);
318
319	ret = mipi_dsi_detach(dsi);
320	if (ret < 0)
321		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
322
323	drm_panel_remove(&ctx->panel);
324
325	return 0;
326}
327
328static const struct of_device_id kd35t133_of_match[] = {
329	{ .compatible = "elida,kd35t133" },
330	{ /* sentinel */ }
331};
332MODULE_DEVICE_TABLE(of, kd35t133_of_match);
333
334static struct mipi_dsi_driver kd35t133_driver = {
335	.driver = {
336		.name = "panel-elida-kd35t133",
337		.of_match_table = kd35t133_of_match,
338	},
339	.probe	= kd35t133_probe,
340	.remove = kd35t133_remove,
341	.shutdown = kd35t133_shutdown,
342};
343module_mipi_dsi_driver(kd35t133_driver);
344
345MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
346MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
347MODULE_LICENSE("GPL v2");