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