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
25 struct 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
to_panel_info(struct drm_panel * panel)36 static inline struct sw43408_panel *to_panel_info(struct drm_panel *panel)
37 {
38 return container_of(panel, struct sw43408_panel, base);
39 }
40
sw43408_unprepare(struct drm_panel * panel)41 static 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
sw43408_program(struct drm_panel * panel)60 static 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
sw43408_prepare(struct drm_panel * panel)122 static 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
146 poweroff:
147 gpiod_set_value(ctx->reset_gpio, 1);
148 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
149 return ret;
150 }
151
152 static 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
sw43408_get_modes(struct drm_panel * panel,struct drm_connector * connector)171 static 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
sw43408_backlight_update_status(struct backlight_device * bl)177 static 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
185 static const struct backlight_ops sw43408_backlight_ops = {
186 .update_status = sw43408_backlight_update_status,
187 };
188
sw43408_backlight_init(struct sw43408_panel * ctx)189 static 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
210 static const struct drm_panel_funcs sw43408_funcs = {
211 .unprepare = sw43408_unprepare,
212 .prepare = sw43408_prepare,
213 .get_modes = sw43408_get_modes,
214 };
215
216 static const struct of_device_id sw43408_of_match[] = {
217 { .compatible = "lg,sw43408", },
218 { /* sentinel */ }
219 };
220 MODULE_DEVICE_TABLE(of, sw43408_of_match);
221
sw43408_add(struct sw43408_panel * ctx)222 static 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
sw43408_probe(struct mipi_dsi_device * dsi)255 static 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
sw43408_remove(struct mipi_dsi_device * dsi)292 static 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
308 static 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 };
316 module_mipi_dsi_driver(sw43408_driver);
317
318 MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
319 MODULE_DESCRIPTION("LG SW436408 MIPI-DSI LED panel");
320 MODULE_LICENSE("GPL");
321