1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Elida kd35t133 5.5" MIPI-DSI panel driver 4 * Copyright (C) 2020 Theobroma Systems Design und Consulting GmbH 5 * 6 * based on 7 * 8 * Rockteck jh057n00900 5.5" MIPI-DSI panel driver 9 * Copyright (C) Purism SPC 2019 10 */ 11 12 #include <linux/delay.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/media-bus-format.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/regulator/consumer.h> 18 19 #include <video/display_timing.h> 20 #include <video/mipi_display.h> 21 22 #include <drm/drm_mipi_dsi.h> 23 #include <drm/drm_modes.h> 24 #include <drm/drm_panel.h> 25 26 /* Manufacturer specific Commands send via DSI */ 27 #define KD35T133_CMD_INTERFACEMODECTRL 0xb0 28 #define KD35T133_CMD_FRAMERATECTRL 0xb1 29 #define KD35T133_CMD_DISPLAYINVERSIONCTRL 0xb4 30 #define KD35T133_CMD_DISPLAYFUNCTIONCTRL 0xb6 31 #define KD35T133_CMD_POWERCONTROL1 0xc0 32 #define KD35T133_CMD_POWERCONTROL2 0xc1 33 #define KD35T133_CMD_VCOMCONTROL 0xc5 34 #define KD35T133_CMD_POSITIVEGAMMA 0xe0 35 #define KD35T133_CMD_NEGATIVEGAMMA 0xe1 36 #define KD35T133_CMD_SETIMAGEFUNCTION 0xe9 37 #define KD35T133_CMD_ADJUSTCONTROL3 0xf7 38 39 struct kd35t133 { 40 struct device *dev; 41 struct drm_panel panel; 42 struct gpio_desc *reset_gpio; 43 struct regulator *vdd; 44 struct regulator *iovcc; 45 enum drm_panel_orientation orientation; 46 bool prepared; 47 }; 48 49 static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel) 50 { 51 return container_of(panel, struct kd35t133, panel); 52 } 53 54 static int kd35t133_init_sequence(struct kd35t133 *ctx) 55 { 56 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 57 struct device *dev = ctx->dev; 58 59 /* 60 * Init sequence was supplied by the panel vendor with minimal 61 * documentation. 62 */ 63 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA, 64 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56, 65 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f); 66 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA, 67 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34, 68 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f); 69 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17); 70 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41); 71 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80); 72 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48); 73 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 74 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00); 75 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0); 76 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02); 77 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL, 78 0x20, 0x02); 79 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00); 80 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3, 81 0xa9, 0x51, 0x2c, 0x82); 82 mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0); 83 84 dev_dbg(dev, "Panel init sequence done\n"); 85 return 0; 86 } 87 88 static int kd35t133_unprepare(struct drm_panel *panel) 89 { 90 struct kd35t133 *ctx = panel_to_kd35t133(panel); 91 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 92 int ret; 93 94 if (!ctx->prepared) 95 return 0; 96 97 ret = mipi_dsi_dcs_set_display_off(dsi); 98 if (ret < 0) 99 dev_err(ctx->dev, "failed to set display off: %d\n", ret); 100 101 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 102 if (ret < 0) { 103 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret); 104 return ret; 105 } 106 107 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 108 109 regulator_disable(ctx->iovcc); 110 regulator_disable(ctx->vdd); 111 112 ctx->prepared = false; 113 114 return 0; 115 } 116 117 static int kd35t133_prepare(struct drm_panel *panel) 118 { 119 struct kd35t133 *ctx = panel_to_kd35t133(panel); 120 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 121 int ret; 122 123 if (ctx->prepared) 124 return 0; 125 126 dev_dbg(ctx->dev, "Resetting the panel\n"); 127 ret = regulator_enable(ctx->vdd); 128 if (ret < 0) { 129 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret); 130 return ret; 131 } 132 133 ret = regulator_enable(ctx->iovcc); 134 if (ret < 0) { 135 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); 136 goto disable_vdd; 137 } 138 139 msleep(20); 140 141 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 142 usleep_range(10, 20); 143 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 144 145 msleep(20); 146 147 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 148 if (ret < 0) { 149 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret); 150 goto disable_iovcc; 151 } 152 153 msleep(250); 154 155 ret = kd35t133_init_sequence(ctx); 156 if (ret < 0) { 157 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret); 158 goto disable_iovcc; 159 } 160 161 ret = mipi_dsi_dcs_set_display_on(dsi); 162 if (ret < 0) { 163 dev_err(ctx->dev, "Failed to set display on: %d\n", ret); 164 goto disable_iovcc; 165 } 166 167 msleep(50); 168 169 ctx->prepared = true; 170 171 return 0; 172 173 disable_iovcc: 174 regulator_disable(ctx->iovcc); 175 disable_vdd: 176 regulator_disable(ctx->vdd); 177 return ret; 178 } 179 180 static const struct drm_display_mode default_mode = { 181 .hdisplay = 320, 182 .hsync_start = 320 + 130, 183 .hsync_end = 320 + 130 + 4, 184 .htotal = 320 + 130 + 4 + 130, 185 .vdisplay = 480, 186 .vsync_start = 480 + 2, 187 .vsync_end = 480 + 2 + 1, 188 .vtotal = 480 + 2 + 1 + 2, 189 .clock = 17000, 190 .width_mm = 42, 191 .height_mm = 82, 192 }; 193 194 static int kd35t133_get_modes(struct drm_panel *panel, 195 struct drm_connector *connector) 196 { 197 struct kd35t133 *ctx = panel_to_kd35t133(panel); 198 struct drm_display_mode *mode; 199 200 mode = drm_mode_duplicate(connector->dev, &default_mode); 201 if (!mode) { 202 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n", 203 default_mode.hdisplay, default_mode.vdisplay, 204 drm_mode_vrefresh(&default_mode)); 205 return -ENOMEM; 206 } 207 208 drm_mode_set_name(mode); 209 210 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 211 connector->display_info.width_mm = mode->width_mm; 212 connector->display_info.height_mm = mode->height_mm; 213 drm_mode_probed_add(connector, mode); 214 /* 215 * TODO: Remove once all drm drivers call 216 * drm_connector_set_orientation_from_panel() 217 */ 218 drm_connector_set_panel_orientation(connector, ctx->orientation); 219 220 return 1; 221 } 222 223 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel) 224 { 225 struct kd35t133 *ctx = panel_to_kd35t133(panel); 226 227 return ctx->orientation; 228 } 229 230 static const struct drm_panel_funcs kd35t133_funcs = { 231 .unprepare = kd35t133_unprepare, 232 .prepare = kd35t133_prepare, 233 .get_modes = kd35t133_get_modes, 234 .get_orientation = kd35t133_get_orientation, 235 }; 236 237 static int kd35t133_probe(struct mipi_dsi_device *dsi) 238 { 239 struct device *dev = &dsi->dev; 240 struct kd35t133 *ctx; 241 int ret; 242 243 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 244 if (!ctx) 245 return -ENOMEM; 246 247 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 248 if (IS_ERR(ctx->reset_gpio)) { 249 dev_err(dev, "cannot get reset gpio\n"); 250 return PTR_ERR(ctx->reset_gpio); 251 } 252 253 ctx->vdd = devm_regulator_get(dev, "vdd"); 254 if (IS_ERR(ctx->vdd)) { 255 ret = PTR_ERR(ctx->vdd); 256 if (ret != -EPROBE_DEFER) 257 dev_err(dev, "Failed to request vdd regulator: %d\n", ret); 258 return ret; 259 } 260 261 ctx->iovcc = devm_regulator_get(dev, "iovcc"); 262 if (IS_ERR(ctx->iovcc)) { 263 ret = PTR_ERR(ctx->iovcc); 264 if (ret != -EPROBE_DEFER) 265 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret); 266 return ret; 267 } 268 269 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation); 270 if (ret < 0) { 271 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret); 272 return ret; 273 } 274 275 mipi_dsi_set_drvdata(dsi, ctx); 276 277 ctx->dev = dev; 278 279 dsi->lanes = 1; 280 dsi->format = MIPI_DSI_FMT_RGB888; 281 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 282 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET | 283 MIPI_DSI_CLOCK_NON_CONTINUOUS; 284 285 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs, 286 DRM_MODE_CONNECTOR_DSI); 287 288 ret = drm_panel_of_backlight(&ctx->panel); 289 if (ret) 290 return ret; 291 292 drm_panel_add(&ctx->panel); 293 294 ret = mipi_dsi_attach(dsi); 295 if (ret < 0) { 296 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret); 297 drm_panel_remove(&ctx->panel); 298 return ret; 299 } 300 301 return 0; 302 } 303 304 static void kd35t133_shutdown(struct mipi_dsi_device *dsi) 305 { 306 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 307 int ret; 308 309 ret = drm_panel_unprepare(&ctx->panel); 310 if (ret < 0) 311 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret); 312 313 ret = drm_panel_disable(&ctx->panel); 314 if (ret < 0) 315 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret); 316 } 317 318 static void kd35t133_remove(struct mipi_dsi_device *dsi) 319 { 320 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 321 int ret; 322 323 kd35t133_shutdown(dsi); 324 325 ret = mipi_dsi_detach(dsi); 326 if (ret < 0) 327 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); 328 329 drm_panel_remove(&ctx->panel); 330 } 331 332 static const struct of_device_id kd35t133_of_match[] = { 333 { .compatible = "elida,kd35t133" }, 334 { /* sentinel */ } 335 }; 336 MODULE_DEVICE_TABLE(of, kd35t133_of_match); 337 338 static struct mipi_dsi_driver kd35t133_driver = { 339 .driver = { 340 .name = "panel-elida-kd35t133", 341 .of_match_table = kd35t133_of_match, 342 }, 343 .probe = kd35t133_probe, 344 .remove = kd35t133_remove, 345 .shutdown = kd35t133_shutdown, 346 }; 347 module_mipi_dsi_driver(kd35t133_driver); 348 349 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>"); 350 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel"); 351 MODULE_LICENSE("GPL v2"); 352