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
 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};
 47
 48static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
 49{
 50	return container_of(panel, struct kd35t133, panel);
 51}
 52
 53static 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
 87static 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
111static 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
162disable_iovcc:
163	regulator_disable(ctx->iovcc);
164disable_vdd:
165	regulator_disable(ctx->vdd);
166	return ret;
167}
168
169static 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
183static 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
207static 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
214static 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
221static 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
288static 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
300static const struct of_device_id kd35t133_of_match[] = {
301	{ .compatible = "elida,kd35t133" },
302	{ /* sentinel */ }
303};
304MODULE_DEVICE_TABLE(of, kd35t133_of_match);
305
306static 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};
314module_mipi_dsi_driver(kd35t133_driver);
315
316MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
317MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
318MODULE_LICENSE("GPL v2");