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 16 struct 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 bool prepared; 23 }; 24 25 static inline struct 26 s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel) 27 { 28 return container_of(panel, struct s6e88a0_ams452ef01, panel); 29 } 30 31 #define dsi_dcs_write_seq(dsi, seq...) do { \ 32 static const u8 d[] = { seq }; \ 33 int ret; \ 34 ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d)); \ 35 if (ret < 0) \ 36 return ret; \ 37 } while (0) 38 39 static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx) 40 { 41 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 42 usleep_range(5000, 6000); 43 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 44 usleep_range(1000, 2000); 45 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 46 usleep_range(10000, 11000); 47 } 48 49 static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx) 50 { 51 struct mipi_dsi_device *dsi = ctx->dsi; 52 struct device *dev = &dsi->dev; 53 int ret; 54 55 dsi->mode_flags |= MIPI_DSI_MODE_LPM; 56 57 dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands 58 dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity 59 60 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 61 if (ret < 0) { 62 dev_err(dev, "Failed to exit sleep mode: %d\n", ret); 63 return ret; 64 } 65 msleep(120); 66 67 // set default brightness/gama 68 dsi_dcs_write_seq(dsi, 0xca, 69 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, // V255 RR,GG,BB 70 0x80, 0x80, 0x80, // V203 R,G,B 71 0x80, 0x80, 0x80, // V151 R,G,B 72 0x80, 0x80, 0x80, // V87 R,G,B 73 0x80, 0x80, 0x80, // V51 R,G,B 74 0x80, 0x80, 0x80, // V35 R,G,B 75 0x80, 0x80, 0x80, // V23 R,G,B 76 0x80, 0x80, 0x80, // V11 R,G,B 77 0x6b, 0x68, 0x71, // V3 R,G,B 78 0x00, 0x00, 0x00); // V1 R,G,B 79 // set default Amoled Off Ratio 80 dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a); 81 dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage 82 dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00); 83 dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update 84 dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands 85 86 ret = mipi_dsi_dcs_set_display_on(dsi); 87 if (ret < 0) { 88 dev_err(dev, "Failed to set display on: %d\n", ret); 89 return ret; 90 } 91 92 return 0; 93 } 94 95 static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx) 96 { 97 struct mipi_dsi_device *dsi = ctx->dsi; 98 struct device *dev = &dsi->dev; 99 int ret; 100 101 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; 102 103 ret = mipi_dsi_dcs_set_display_off(dsi); 104 if (ret < 0) { 105 dev_err(dev, "Failed to set display off: %d\n", ret); 106 return ret; 107 } 108 msleep(35); 109 110 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 111 if (ret < 0) { 112 dev_err(dev, "Failed to enter sleep mode: %d\n", ret); 113 return ret; 114 } 115 msleep(120); 116 117 return 0; 118 } 119 120 static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel) 121 { 122 struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel); 123 struct device *dev = &ctx->dsi->dev; 124 int ret; 125 126 if (ctx->prepared) 127 return 0; 128 129 ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 130 if (ret < 0) { 131 dev_err(dev, "Failed to enable regulators: %d\n", ret); 132 return ret; 133 } 134 135 s6e88a0_ams452ef01_reset(ctx); 136 137 ret = s6e88a0_ams452ef01_on(ctx); 138 if (ret < 0) { 139 dev_err(dev, "Failed to initialize panel: %d\n", ret); 140 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 141 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), 142 ctx->supplies); 143 return ret; 144 } 145 146 ctx->prepared = true; 147 return 0; 148 } 149 150 static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel) 151 { 152 struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel); 153 struct device *dev = &ctx->dsi->dev; 154 int ret; 155 156 if (!ctx->prepared) 157 return 0; 158 159 ret = s6e88a0_ams452ef01_off(ctx); 160 if (ret < 0) 161 dev_err(dev, "Failed to un-initialize panel: %d\n", ret); 162 163 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 164 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 165 166 ctx->prepared = false; 167 return 0; 168 } 169 170 static const struct drm_display_mode s6e88a0_ams452ef01_mode = { 171 .clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000, 172 .hdisplay = 540, 173 .hsync_start = 540 + 88, 174 .hsync_end = 540 + 88 + 4, 175 .htotal = 540 + 88 + 4 + 20, 176 .vdisplay = 960, 177 .vsync_start = 960 + 14, 178 .vsync_end = 960 + 14 + 2, 179 .vtotal = 960 + 14 + 2 + 8, 180 .width_mm = 56, 181 .height_mm = 100, 182 }; 183 184 static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel, 185 struct drm_connector *connector) 186 { 187 struct drm_display_mode *mode; 188 189 mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode); 190 if (!mode) 191 return -ENOMEM; 192 193 drm_mode_set_name(mode); 194 195 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 196 connector->display_info.width_mm = mode->width_mm; 197 connector->display_info.height_mm = mode->height_mm; 198 drm_mode_probed_add(connector, mode); 199 200 return 1; 201 } 202 203 static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = { 204 .unprepare = s6e88a0_ams452ef01_unprepare, 205 .prepare = s6e88a0_ams452ef01_prepare, 206 .get_modes = s6e88a0_ams452ef01_get_modes, 207 }; 208 209 static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi) 210 { 211 struct device *dev = &dsi->dev; 212 struct s6e88a0_ams452ef01 *ctx; 213 int ret; 214 215 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 216 if (!ctx) 217 return -ENOMEM; 218 219 ctx->supplies[0].supply = "vdd3"; 220 ctx->supplies[1].supply = "vci"; 221 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies), 222 ctx->supplies); 223 if (ret < 0) { 224 dev_err(dev, "Failed to get regulators: %d\n", ret); 225 return ret; 226 } 227 228 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 229 if (IS_ERR(ctx->reset_gpio)) { 230 ret = PTR_ERR(ctx->reset_gpio); 231 dev_err(dev, "Failed to get reset-gpios: %d\n", ret); 232 return ret; 233 } 234 235 ctx->dsi = dsi; 236 mipi_dsi_set_drvdata(dsi, ctx); 237 238 dsi->lanes = 2; 239 dsi->format = MIPI_DSI_FMT_RGB888; 240 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST; 241 242 drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs, 243 DRM_MODE_CONNECTOR_DSI); 244 245 drm_panel_add(&ctx->panel); 246 247 ret = mipi_dsi_attach(dsi); 248 if (ret < 0) { 249 dev_err(dev, "Failed to attach to DSI host: %d\n", ret); 250 drm_panel_remove(&ctx->panel); 251 return ret; 252 } 253 254 return 0; 255 } 256 257 static void s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi) 258 { 259 struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi); 260 int ret; 261 262 ret = mipi_dsi_detach(dsi); 263 if (ret < 0) 264 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); 265 266 drm_panel_remove(&ctx->panel); 267 } 268 269 static const struct of_device_id s6e88a0_ams452ef01_of_match[] = { 270 { .compatible = "samsung,s6e88a0-ams452ef01" }, 271 { /* sentinel */ }, 272 }; 273 MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match); 274 275 static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = { 276 .probe = s6e88a0_ams452ef01_probe, 277 .remove = s6e88a0_ams452ef01_remove, 278 .driver = { 279 .name = "panel-s6e88a0-ams452ef01", 280 .of_match_table = s6e88a0_ams452ef01_of_match, 281 }, 282 }; 283 module_mipi_dsi_driver(s6e88a0_ams452ef01_driver); 284 285 MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>"); 286 MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller"); 287 MODULE_LICENSE("GPL v2"); 288