panel-lg-ld070wx3.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include <linux/array_size.h>
  4#include <linux/delay.h>
  5#include <linux/err.h>
  6#include <linux/gpio/consumer.h>
  7#include <linux/mod_devicetable.h>
  8#include <linux/module.h>
  9#include <linux/property.h>
 10#include <linux/regulator/consumer.h>
 11
 12#include <video/mipi_display.h>
 13
 14#include <drm/drm_mipi_dsi.h>
 15#include <drm/drm_modes.h>
 16#include <drm/drm_panel.h>
 17#include <drm/drm_probe_helper.h>
 18
 19static const struct regulator_bulk_data lg_ld070wx3_supplies[] = {
 20	{ .supply = "vdd" }, { .supply = "vcc" },
 21};
 22
 23struct lg_ld070wx3 {
 24	struct drm_panel panel;
 25	struct mipi_dsi_device *dsi;
 26
 27	struct regulator_bulk_data *supplies;
 28};
 29
 30static inline struct lg_ld070wx3 *to_lg_ld070wx3(struct drm_panel *panel)
 31{
 32	return container_of(panel, struct lg_ld070wx3, panel);
 33}
 34
 35static int lg_ld070wx3_prepare(struct drm_panel *panel)
 36{
 37	struct lg_ld070wx3 *priv = to_lg_ld070wx3(panel);
 38	struct mipi_dsi_multi_context ctx = { .dsi = priv->dsi };
 39	struct device *dev = panel->dev;
 40	int ret;
 41
 42	ret = regulator_bulk_enable(ARRAY_SIZE(lg_ld070wx3_supplies), priv->supplies);
 43	if (ret < 0) {
 44		dev_err(dev, "failed to enable power supplies: %d\n", ret);
 45		return ret;
 46	}
 47
 48	/*
 49	 * According to spec delay between enabling supply is 0,
 50	 * for regulators to reach required voltage ~5ms needed.
 51	 * MIPI interface signal for setup requires additional
 52	 * 110ms which in total results in 115ms.
 53	 */
 54	mdelay(115);
 55
 56	mipi_dsi_dcs_soft_reset_multi(&ctx);
 57	mipi_dsi_msleep(&ctx, 20);
 58
 59	/* Differential input impedance selection */
 60	mipi_dsi_dcs_write_seq_multi(&ctx, 0xae, 0x0b);
 61
 62	/* Enter test mode 1 and 2*/
 63	mipi_dsi_dcs_write_seq_multi(&ctx, 0xee, 0xea);
 64	mipi_dsi_dcs_write_seq_multi(&ctx, 0xef, 0x5f);
 65
 66	/* Increased MIPI CLK driving ability */
 67	mipi_dsi_dcs_write_seq_multi(&ctx, 0xf2, 0x68);
 68
 69	/* Exit test mode 1 and 2 */
 70	mipi_dsi_dcs_write_seq_multi(&ctx, 0xee, 0x00);
 71	mipi_dsi_dcs_write_seq_multi(&ctx, 0xef, 0x00);
 72
 73	return ctx.accum_err;
 74}
 75
 76static int lg_ld070wx3_unprepare(struct drm_panel *panel)
 77{
 78	struct lg_ld070wx3 *priv = to_lg_ld070wx3(panel);
 79	struct mipi_dsi_multi_context ctx = { .dsi = priv->dsi };
 80
 81	mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);
 82
 83	msleep(50);
 84
 85	regulator_bulk_disable(ARRAY_SIZE(lg_ld070wx3_supplies), priv->supplies);
 86
 87	/* power supply must be off for at least 1s after panel disable */
 88	msleep(1000);
 89
 90	return 0;
 91}
 92
 93static const struct drm_display_mode lg_ld070wx3_mode = {
 94	.clock = (800 + 32 + 48 + 8) * (1280 + 5 + 3 + 1) * 60 / 1000,
 95	.hdisplay = 800,
 96	.hsync_start = 800 + 32,
 97	.hsync_end = 800 + 32 + 48,
 98	.htotal = 800 + 32 + 48 + 8,
 99	.vdisplay = 1280,
100	.vsync_start = 1280 + 5,
101	.vsync_end = 1280 + 5 + 3,
102	.vtotal = 1280 + 5 + 3 + 1,
103	.width_mm = 94,
104	.height_mm = 151,
105	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
106};
107
108static int lg_ld070wx3_get_modes(struct drm_panel *panel,
109				 struct drm_connector *connector)
110{
111	return drm_connector_helper_get_modes_fixed(connector, &lg_ld070wx3_mode);
112}
113
114static const struct drm_panel_funcs lg_ld070wx3_panel_funcs = {
115	.prepare = lg_ld070wx3_prepare,
116	.unprepare = lg_ld070wx3_unprepare,
117	.get_modes = lg_ld070wx3_get_modes,
118};
119
120static int lg_ld070wx3_probe(struct mipi_dsi_device *dsi)
121{
122	struct device *dev = &dsi->dev;
123	struct lg_ld070wx3 *priv;
124	int ret;
125
126	priv = devm_drm_panel_alloc(dev, struct lg_ld070wx3, panel,
127				    &lg_ld070wx3_panel_funcs,
128				    DRM_MODE_CONNECTOR_DSI);
129	if (IS_ERR(priv))
130		return PTR_ERR(priv);
131
132	ret = devm_regulator_bulk_get_const(dev, ARRAY_SIZE(lg_ld070wx3_supplies),
133					    lg_ld070wx3_supplies, &priv->supplies);
134	if (ret < 0)
135		return dev_err_probe(dev, ret, "failed to get supplies\n");
136
137	priv->dsi = dsi;
138	mipi_dsi_set_drvdata(dsi, priv);
139
140	dsi->lanes = 4;
141	dsi->format = MIPI_DSI_FMT_RGB888;
142	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM;
143
144	ret = drm_panel_of_backlight(&priv->panel);
145	if (ret < 0)
146		return dev_err_probe(dev, ret, "failed to get backlight\n");
147
148	drm_panel_add(&priv->panel);
149
150	ret = devm_mipi_dsi_attach(dev, dsi);
151	if (ret < 0) {
152		drm_panel_remove(&priv->panel);
153		return dev_err_probe(dev, ret, "failed to attach to DSI host\n");
154	}
155
156	return 0;
157}
158
159static void lg_ld070wx3_remove(struct mipi_dsi_device *dsi)
160{
161	struct lg_ld070wx3 *priv = mipi_dsi_get_drvdata(dsi);
162
163	drm_panel_remove(&priv->panel);
164}
165
166static const struct of_device_id lg_ld070wx3_of_match[] = {
167	{ .compatible = "lg,ld070wx3-sl01" },
168	{ /* sentinel */ }
169};
170MODULE_DEVICE_TABLE(of, lg_ld070wx3_of_match);
171
172static struct mipi_dsi_driver lg_ld070wx3_driver = {
173	.driver = {
174		.name = "panel-lg-ld070wx3",
175		.of_match_table = lg_ld070wx3_of_match,
176	},
177	.probe = lg_ld070wx3_probe,
178	.remove = lg_ld070wx3_remove,
179};
180module_mipi_dsi_driver(lg_ld070wx3_driver);
181
182MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
183MODULE_DESCRIPTION("LG LD070WX3-SL01 DSI panel driver");
184MODULE_LICENSE("GPL");