1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright (C) 2019-2024 Linaro Ltd
  4 * Author: Sumit Semwal <sumit.semwal@linaro.org>
  5 *	 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
  6 */
  7
  8#include <linux/backlight.h>
  9#include <linux/delay.h>
 10#include <linux/gpio/consumer.h>
 11#include <linux/module.h>
 12#include <linux/of.h>
 13#include <linux/regulator/consumer.h>
 14
 15#include <video/mipi_display.h>
 16
 17#include <drm/drm_mipi_dsi.h>
 18#include <drm/drm_panel.h>
 19#include <drm/drm_probe_helper.h>
 20#include <drm/display/drm_dsc.h>
 21#include <drm/display/drm_dsc_helper.h>
 22
 23#define NUM_SUPPLIES 2
 24
 25struct sw43408_panel {
 26	struct drm_panel base;
 27	struct mipi_dsi_device *link;
 28
 29	struct regulator_bulk_data supplies[NUM_SUPPLIES];
 30
 31	struct gpio_desc *reset_gpio;
 32
 33	struct drm_dsc_config dsc;
 34};
 35
 36static inline struct sw43408_panel *to_panel_info(struct drm_panel *panel)
 37{
 38	return container_of(panel, struct sw43408_panel, base);
 39}
 40
 41static int sw43408_unprepare(struct drm_panel *panel)
 42{
 43	struct sw43408_panel *sw43408 = to_panel_info(panel);
 44	struct mipi_dsi_multi_context ctx = { .dsi = sw43408->link };
 45	int ret;
 46
 47	mipi_dsi_dcs_set_display_off_multi(&ctx);
 48
 49	mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);
 50
 51	mipi_dsi_msleep(&ctx, 100);
 52
 53	gpiod_set_value(sw43408->reset_gpio, 1);
 54
 55	ret = regulator_bulk_disable(ARRAY_SIZE(sw43408->supplies), sw43408->supplies);
 56
 57	return ret ? : ctx.accum_err;
 58}
 59
 60static int sw43408_program(struct drm_panel *panel)
 61{
 62	struct sw43408_panel *sw43408 = to_panel_info(panel);
 63	struct mipi_dsi_multi_context ctx = { .dsi = sw43408->link };
 64	struct drm_dsc_picture_parameter_set pps;
 65
 66	mipi_dsi_dcs_write_seq_multi(&ctx, MIPI_DCS_SET_GAMMA_CURVE, 0x02);
 67
 68	mipi_dsi_dcs_set_tear_on_multi(&ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
 69
 70	mipi_dsi_dcs_write_seq_multi(&ctx, 0x53, 0x0c, 0x30);
 71	mipi_dsi_dcs_write_seq_multi(&ctx, 0x55, 0x00, 0x70, 0xdf, 0x00, 0x70, 0xdf);
 72	mipi_dsi_dcs_write_seq_multi(&ctx, 0xf7, 0x01, 0x49, 0x0c);
 73
 74	mipi_dsi_dcs_exit_sleep_mode_multi(&ctx);
 75
 76	mipi_dsi_msleep(&ctx, 135);
 77
 78	/* COMPRESSION_MODE moved after setting the PPS */
 79
 80	mipi_dsi_dcs_write_seq_multi(&ctx, 0xb0, 0xac);
 81	mipi_dsi_dcs_write_seq_multi(&ctx, 0xe5,
 82			       0x00, 0x3a, 0x00, 0x3a, 0x00, 0x0e, 0x10);
 83	mipi_dsi_dcs_write_seq_multi(&ctx, 0xb5,
 84			       0x75, 0x60, 0x2d, 0x5d, 0x80, 0x00, 0x0a, 0x0b,
 85			       0x00, 0x05, 0x0b, 0x00, 0x80, 0x0d, 0x0e, 0x40,
 86			       0x00, 0x0c, 0x00, 0x16, 0x00, 0xb8, 0x00, 0x80,
 87			       0x0d, 0x0e, 0x40, 0x00, 0x0c, 0x00, 0x16, 0x00,
 88			       0xb8, 0x00, 0x81, 0x00, 0x03, 0x03, 0x03, 0x01,
 89			       0x01);
 90	mipi_dsi_msleep(&ctx, 85);
 91	mipi_dsi_dcs_write_seq_multi(&ctx, 0xcd,
 92			       0x00, 0x00, 0x00, 0x19, 0x19, 0x19, 0x19, 0x19,
 93			       0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
 94			       0x16, 0x16);
 95	mipi_dsi_dcs_write_seq_multi(&ctx, 0xcb, 0x80, 0x5c, 0x07, 0x03, 0x28);
 96	mipi_dsi_dcs_write_seq_multi(&ctx, 0xc0, 0x02, 0x02, 0x0f);
 97	mipi_dsi_dcs_write_seq_multi(&ctx, 0x55, 0x04, 0x61, 0xdb, 0x04, 0x70, 0xdb);
 98	mipi_dsi_dcs_write_seq_multi(&ctx, 0xb0, 0xca);
 99
100	mipi_dsi_dcs_set_display_on_multi(&ctx);
101
102	mipi_dsi_msleep(&ctx, 50);
103
104	sw43408->link->mode_flags &= ~MIPI_DSI_MODE_LPM;
105
106	drm_dsc_pps_payload_pack(&pps, sw43408->link->dsc);
107
108	mipi_dsi_picture_parameter_set_multi(&ctx, &pps);
109
110	sw43408->link->mode_flags |= MIPI_DSI_MODE_LPM;
111
112	/*
113	 * This panel uses PPS selectors with offset:
114	 * PPS 1 if pps_identifier is 0
115	 * PPS 2 if pps_identifier is 1
116	 */
117	mipi_dsi_compression_mode_ext_multi(&ctx, true,
118					    MIPI_DSI_COMPRESSION_DSC, 1);
119	return ctx.accum_err;
120}
121
122static int sw43408_prepare(struct drm_panel *panel)
123{
124	struct sw43408_panel *ctx = to_panel_info(panel);
125	int ret;
126
127	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
128	if (ret < 0)
129		return ret;
130
131	usleep_range(5000, 6000);
132
133	gpiod_set_value(ctx->reset_gpio, 0);
134	usleep_range(9000, 10000);
135	gpiod_set_value(ctx->reset_gpio, 1);
136	usleep_range(1000, 2000);
137	gpiod_set_value(ctx->reset_gpio, 0);
138	usleep_range(9000, 10000);
139
140	ret = sw43408_program(panel);
141	if (ret)
142		goto poweroff;
143
144	return 0;
145
146poweroff:
147	gpiod_set_value(ctx->reset_gpio, 1);
148	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
149	return ret;
150}
151
152static const struct drm_display_mode sw43408_mode = {
153	.clock = (1080 + 20 + 32 + 20) * (2160 + 20 + 4 + 20) * 60 / 1000,
154
155	.hdisplay = 1080,
156	.hsync_start = 1080 + 20,
157	.hsync_end = 1080 + 20 + 32,
158	.htotal = 1080 + 20 + 32 + 20,
159
160	.vdisplay = 2160,
161	.vsync_start = 2160 + 20,
162	.vsync_end = 2160 + 20 + 4,
163	.vtotal = 2160 + 20 + 4 + 20,
164
165	.width_mm = 62,
166	.height_mm = 124,
167
168	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
169};
170
171static int sw43408_get_modes(struct drm_panel *panel,
172			     struct drm_connector *connector)
173{
174	return drm_connector_helper_get_modes_fixed(connector, &sw43408_mode);
175}
176
177static int sw43408_backlight_update_status(struct backlight_device *bl)
178{
179	struct mipi_dsi_device *dsi = bl_get_data(bl);
180	u16 brightness = backlight_get_brightness(bl);
181
182	return mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
183}
184
185static const struct backlight_ops sw43408_backlight_ops = {
186	.update_status = sw43408_backlight_update_status,
187};
188
189static int sw43408_backlight_init(struct sw43408_panel *ctx)
190{
191	struct device *dev = &ctx->link->dev;
192	const struct backlight_properties props = {
193		.type = BACKLIGHT_PLATFORM,
194		.brightness = 255,
195		.max_brightness = 255,
196	};
197
198	ctx->base.backlight = devm_backlight_device_register(dev, dev_name(dev), dev,
199							     ctx->link,
200							     &sw43408_backlight_ops,
201							     &props);
202
203	if (IS_ERR(ctx->base.backlight))
204		return dev_err_probe(dev, PTR_ERR(ctx->base.backlight),
205				     "Failed to create backlight\n");
206
207	return 0;
208}
209
210static const struct drm_panel_funcs sw43408_funcs = {
211	.unprepare = sw43408_unprepare,
212	.prepare = sw43408_prepare,
213	.get_modes = sw43408_get_modes,
214};
215
216static const struct of_device_id sw43408_of_match[] = {
217	{ .compatible = "lg,sw43408", },
218	{ /* sentinel */ }
219};
220MODULE_DEVICE_TABLE(of, sw43408_of_match);
221
222static int sw43408_add(struct sw43408_panel *ctx)
223{
224	struct device *dev = &ctx->link->dev;
225	int ret;
226
227	ctx->supplies[0].supply = "vddi"; /* 1.88 V */
228	ctx->supplies[0].init_load_uA = 62000;
229	ctx->supplies[1].supply = "vpnl"; /* 3.0 V */
230	ctx->supplies[1].init_load_uA = 857000;
231
232	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
233				      ctx->supplies);
234	if (ret < 0)
235		return ret;
236
237	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
238	if (IS_ERR(ctx->reset_gpio)) {
239		ret = PTR_ERR(ctx->reset_gpio);
240		return dev_err_probe(dev, ret, "cannot get reset gpio\n");
241	}
242
243	ret = sw43408_backlight_init(ctx);
244	if (ret < 0)
245		return ret;
246
247	ctx->base.prepare_prev_first = true;
248
249	drm_panel_init(&ctx->base, dev, &sw43408_funcs, DRM_MODE_CONNECTOR_DSI);
250
251	drm_panel_add(&ctx->base);
252	return ret;
253}
254
255static int sw43408_probe(struct mipi_dsi_device *dsi)
256{
257	struct sw43408_panel *ctx;
258	int ret;
259
260	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
261	if (!ctx)
262		return -ENOMEM;
263
264	dsi->mode_flags = MIPI_DSI_MODE_LPM;
265	dsi->format = MIPI_DSI_FMT_RGB888;
266	dsi->lanes = 4;
267
268	ctx->link = dsi;
269	mipi_dsi_set_drvdata(dsi, ctx);
270
271	ret = sw43408_add(ctx);
272	if (ret < 0)
273		return ret;
274
275	/* The panel works only in the DSC mode. Set DSC params. */
276	ctx->dsc.dsc_version_major = 0x1;
277	ctx->dsc.dsc_version_minor = 0x1;
278
279	/* slice_count * slice_width == width */
280	ctx->dsc.slice_height = 16;
281	ctx->dsc.slice_width = 540;
282	ctx->dsc.slice_count = 2;
283	ctx->dsc.bits_per_component = 8;
284	ctx->dsc.bits_per_pixel = 8 << 4;
285	ctx->dsc.block_pred_enable = true;
286
287	dsi->dsc = &ctx->dsc;
288
289	return mipi_dsi_attach(dsi);
290}
291
292static void sw43408_remove(struct mipi_dsi_device *dsi)
293{
294	struct sw43408_panel *ctx = mipi_dsi_get_drvdata(dsi);
295	int ret;
296
297	ret = sw43408_unprepare(&ctx->base);
298	if (ret < 0)
299		dev_err(&dsi->dev, "failed to unprepare panel: %d\n", ret);
300
301	ret = mipi_dsi_detach(dsi);
302	if (ret < 0)
303		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
304
305	drm_panel_remove(&ctx->base);
306}
307
308static struct mipi_dsi_driver sw43408_driver = {
309	.driver = {
310		.name = "panel-lg-sw43408",
311		.of_match_table = sw43408_of_match,
312	},
313	.probe = sw43408_probe,
314	.remove = sw43408_remove,
315};
316module_mipi_dsi_driver(sw43408_driver);
317
318MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
319MODULE_DESCRIPTION("LG SW436408 MIPI-DSI LED panel");
320MODULE_LICENSE("GPL");