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 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 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 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 } 121 122 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 }; 170 171 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 } 176 177 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 }; 188 189 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); 221 222 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 } 254 255 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 } 291 292 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