panel-samsung-s6e88a0-ams452ef01.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2// Copyright (C) 2019, Michael Srba
  3
  4#include <linux/delay.h>
  5#include <linux/gpio/consumer.h>
  6#include <linux/module.h>
  7#include <linux/of.h>
  8#include <linux/regulator/consumer.h>
  9
 10#include <video/mipi_display.h>
 11
 12#include <drm/drm_mipi_dsi.h>
 13#include <drm/drm_modes.h>
 14#include <drm/drm_panel.h>
 15
 16struct s6e88a0_ams452ef01 {
 17	struct drm_panel panel;
 18	struct mipi_dsi_device *dsi;
 19	struct regulator_bulk_data supplies[2];
 20	struct gpio_desc *reset_gpio;
 21};
 22
 23static inline struct
 24s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
 25{
 26	return container_of(panel, struct s6e88a0_ams452ef01, panel);
 27}
 28
 29static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
 30{
 31	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 32	usleep_range(5000, 6000);
 33	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 34	usleep_range(1000, 2000);
 35	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 36	usleep_range(10000, 11000);
 37}
 38
 39static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
 40{
 41	struct mipi_dsi_device *dsi = ctx->dsi;
 42	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
 43
 44	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 45
 46	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
 47	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xcc, 0x4c); // set Pixel Clock Divider polarity
 48
 49	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
 50	mipi_dsi_msleep(&dsi_ctx, 120);
 51
 52	// set default brightness/gama
 53	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xca,
 54				     0x01, 0x00, 0x01, 0x00, 0x01, 0x00,// V255 RR,GG,BB
 55				     0x80, 0x80, 0x80,			// V203 R,G,B
 56				     0x80, 0x80, 0x80,			// V151 R,G,B
 57				     0x80, 0x80, 0x80,			// V87  R,G,B
 58				     0x80, 0x80, 0x80,			// V51  R,G,B
 59				     0x80, 0x80, 0x80,			// V35  R,G,B
 60				     0x80, 0x80, 0x80,			// V23  R,G,B
 61				     0x80, 0x80, 0x80,			// V11  R,G,B
 62				     0x6b, 0x68, 0x71,			// V3   R,G,B
 63				     0x00, 0x00, 0x00);			// V1   R,G,B
 64	// set default Amoled Off Ratio
 65	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);
 66	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb6, 0x2c, 0x0b); // set default elvss voltage
 67	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
 68	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf7, 0x03); // gamma/aor update
 69	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands
 70
 71	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
 72
 73	return dsi_ctx.accum_err;
 74}
 75
 76static void s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
 77{
 78	struct mipi_dsi_device *dsi = ctx->dsi;
 79	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi};
 80
 81	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 82
 83	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
 84	mipi_dsi_msleep(&dsi_ctx, 35);
 85	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
 86	mipi_dsi_msleep(&dsi_ctx, 120);
 87}
 88
 89static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
 90{
 91	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
 92	int ret;
 93
 94	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 95	if (ret < 0)
 96		return ret;
 97
 98	s6e88a0_ams452ef01_reset(ctx);
 99
100	ret = s6e88a0_ams452ef01_on(ctx);
101	if (ret < 0) {
102		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
103		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
104				       ctx->supplies);
105		return ret;
106	}
107
108	return 0;
109}
110
111static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
112{
113	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
114
115	s6e88a0_ams452ef01_off(ctx);
116
117	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
118	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
119
120	return 0;
121}
122
123static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
124	.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
125	.hdisplay = 540,
126	.hsync_start = 540 + 88,
127	.hsync_end = 540 + 88 + 4,
128	.htotal = 540 + 88 + 4 + 20,
129	.vdisplay = 960,
130	.vsync_start = 960 + 14,
131	.vsync_end = 960 + 14 + 2,
132	.vtotal = 960 + 14 + 2 + 8,
133	.width_mm = 56,
134	.height_mm = 100,
135};
136
137static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
138					struct drm_connector *connector)
139{
140	struct drm_display_mode *mode;
141
142	mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
143	if (!mode)
144		return -ENOMEM;
145
146	drm_mode_set_name(mode);
147
148	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
149	connector->display_info.width_mm = mode->width_mm;
150	connector->display_info.height_mm = mode->height_mm;
151	drm_mode_probed_add(connector, mode);
152
153	return 1;
154}
155
156static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
157	.unprepare = s6e88a0_ams452ef01_unprepare,
158	.prepare = s6e88a0_ams452ef01_prepare,
159	.get_modes = s6e88a0_ams452ef01_get_modes,
160};
161
162static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
163{
164	struct device *dev = &dsi->dev;
165	struct s6e88a0_ams452ef01 *ctx;
166	int ret;
167
168	ctx = devm_drm_panel_alloc(dev, struct s6e88a0_ams452ef01, panel,
169				   &s6e88a0_ams452ef01_panel_funcs,
170				   DRM_MODE_CONNECTOR_DSI);
171	if (IS_ERR(ctx))
172		return PTR_ERR(ctx);
173
174	ctx->supplies[0].supply = "vdd3";
175	ctx->supplies[1].supply = "vci";
176	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
177				      ctx->supplies);
178	if (ret < 0) {
179		dev_err(dev, "Failed to get regulators: %d\n", ret);
180		return ret;
181	}
182
183	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
184	if (IS_ERR(ctx->reset_gpio)) {
185		ret = PTR_ERR(ctx->reset_gpio);
186		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
187		return ret;
188	}
189
190	ctx->dsi = dsi;
191	mipi_dsi_set_drvdata(dsi, ctx);
192
193	dsi->lanes = 2;
194	dsi->format = MIPI_DSI_FMT_RGB888;
195	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
196
197	drm_panel_add(&ctx->panel);
198
199	ret = mipi_dsi_attach(dsi);
200	if (ret < 0) {
201		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
202		drm_panel_remove(&ctx->panel);
203		return ret;
204	}
205
206	return 0;
207}
208
209static void s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
210{
211	struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
212	int ret;
213
214	ret = mipi_dsi_detach(dsi);
215	if (ret < 0)
216		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
217
218	drm_panel_remove(&ctx->panel);
219}
220
221static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
222	{ .compatible = "samsung,s6e88a0-ams452ef01" },
223	{ /* sentinel */ },
224};
225MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
226
227static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
228	.probe = s6e88a0_ams452ef01_probe,
229	.remove = s6e88a0_ams452ef01_remove,
230	.driver = {
231		.name = "panel-s6e88a0-ams452ef01",
232		.of_match_table = s6e88a0_ams452ef01_of_match,
233	},
234};
235module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
236
237MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
238MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
239MODULE_LICENSE("GPL v2");