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 regulator_disable(ctx->iovcc); 108 regulator_disable(ctx->vdd); 109 110 ctx->prepared = false; 111 112 return 0; 113 } 114 115 static int kd35t133_prepare(struct drm_panel *panel) 116 { 117 struct kd35t133 *ctx = panel_to_kd35t133(panel); 118 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 119 int ret; 120 121 if (ctx->prepared) 122 return 0; 123 124 dev_dbg(ctx->dev, "Resetting the panel\n"); 125 ret = regulator_enable(ctx->vdd); 126 if (ret < 0) { 127 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret); 128 return ret; 129 } 130 131 ret = regulator_enable(ctx->iovcc); 132 if (ret < 0) { 133 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); 134 goto disable_vdd; 135 } 136 137 msleep(20); 138 139 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 140 usleep_range(10, 20); 141 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 142 143 msleep(20); 144 145 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 146 if (ret < 0) { 147 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret); 148 goto disable_iovcc; 149 } 150 151 msleep(250); 152 153 ret = kd35t133_init_sequence(ctx); 154 if (ret < 0) { 155 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret); 156 goto disable_iovcc; 157 } 158 159 ret = mipi_dsi_dcs_set_display_on(dsi); 160 if (ret < 0) { 161 dev_err(ctx->dev, "Failed to set display on: %d\n", ret); 162 goto disable_iovcc; 163 } 164 165 msleep(50); 166 167 ctx->prepared = true; 168 169 return 0; 170 171 disable_iovcc: 172 regulator_disable(ctx->iovcc); 173 disable_vdd: 174 regulator_disable(ctx->vdd); 175 return ret; 176 } 177 178 static const struct drm_display_mode default_mode = { 179 .hdisplay = 320, 180 .hsync_start = 320 + 130, 181 .hsync_end = 320 + 130 + 4, 182 .htotal = 320 + 130 + 4 + 130, 183 .vdisplay = 480, 184 .vsync_start = 480 + 2, 185 .vsync_end = 480 + 2 + 1, 186 .vtotal = 480 + 2 + 1 + 2, 187 .clock = 17000, 188 .width_mm = 42, 189 .height_mm = 82, 190 }; 191 192 static int kd35t133_get_modes(struct drm_panel *panel, 193 struct drm_connector *connector) 194 { 195 struct kd35t133 *ctx = panel_to_kd35t133(panel); 196 struct drm_display_mode *mode; 197 198 mode = drm_mode_duplicate(connector->dev, &default_mode); 199 if (!mode) { 200 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n", 201 default_mode.hdisplay, default_mode.vdisplay, 202 drm_mode_vrefresh(&default_mode)); 203 return -ENOMEM; 204 } 205 206 drm_mode_set_name(mode); 207 208 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 209 connector->display_info.width_mm = mode->width_mm; 210 connector->display_info.height_mm = mode->height_mm; 211 drm_mode_probed_add(connector, mode); 212 /* 213 * TODO: Remove once all drm drivers call 214 * drm_connector_set_orientation_from_panel() 215 */ 216 drm_connector_set_panel_orientation(connector, ctx->orientation); 217 218 return 1; 219 } 220 221 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel) 222 { 223 struct kd35t133 *ctx = panel_to_kd35t133(panel); 224 225 return ctx->orientation; 226 } 227 228 static const struct drm_panel_funcs kd35t133_funcs = { 229 .unprepare = kd35t133_unprepare, 230 .prepare = kd35t133_prepare, 231 .get_modes = kd35t133_get_modes, 232 .get_orientation = kd35t133_get_orientation, 233 }; 234 235 static int kd35t133_probe(struct mipi_dsi_device *dsi) 236 { 237 struct device *dev = &dsi->dev; 238 struct kd35t133 *ctx; 239 int ret; 240 241 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 242 if (!ctx) 243 return -ENOMEM; 244 245 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 246 if (IS_ERR(ctx->reset_gpio)) { 247 dev_err(dev, "cannot get reset gpio\n"); 248 return PTR_ERR(ctx->reset_gpio); 249 } 250 251 ctx->vdd = devm_regulator_get(dev, "vdd"); 252 if (IS_ERR(ctx->vdd)) { 253 ret = PTR_ERR(ctx->vdd); 254 if (ret != -EPROBE_DEFER) 255 dev_err(dev, "Failed to request vdd regulator: %d\n", ret); 256 return ret; 257 } 258 259 ctx->iovcc = devm_regulator_get(dev, "iovcc"); 260 if (IS_ERR(ctx->iovcc)) { 261 ret = PTR_ERR(ctx->iovcc); 262 if (ret != -EPROBE_DEFER) 263 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret); 264 return ret; 265 } 266 267 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation); 268 if (ret < 0) { 269 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret); 270 return ret; 271 } 272 273 mipi_dsi_set_drvdata(dsi, ctx); 274 275 ctx->dev = dev; 276 277 dsi->lanes = 1; 278 dsi->format = MIPI_DSI_FMT_RGB888; 279 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 280 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET | 281 MIPI_DSI_CLOCK_NON_CONTINUOUS; 282 283 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs, 284 DRM_MODE_CONNECTOR_DSI); 285 286 ret = drm_panel_of_backlight(&ctx->panel); 287 if (ret) 288 return ret; 289 290 drm_panel_add(&ctx->panel); 291 292 ret = mipi_dsi_attach(dsi); 293 if (ret < 0) { 294 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret); 295 drm_panel_remove(&ctx->panel); 296 return ret; 297 } 298 299 return 0; 300 } 301 302 static void kd35t133_shutdown(struct mipi_dsi_device *dsi) 303 { 304 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 305 int ret; 306 307 ret = drm_panel_unprepare(&ctx->panel); 308 if (ret < 0) 309 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret); 310 311 ret = drm_panel_disable(&ctx->panel); 312 if (ret < 0) 313 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret); 314 } 315 316 static void kd35t133_remove(struct mipi_dsi_device *dsi) 317 { 318 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 319 int ret; 320 321 kd35t133_shutdown(dsi); 322 323 ret = mipi_dsi_detach(dsi); 324 if (ret < 0) 325 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); 326 327 drm_panel_remove(&ctx->panel); 328 } 329 330 static const struct of_device_id kd35t133_of_match[] = { 331 { .compatible = "elida,kd35t133" }, 332 { /* sentinel */ } 333 }; 334 MODULE_DEVICE_TABLE(of, kd35t133_of_match); 335 336 static struct mipi_dsi_driver kd35t133_driver = { 337 .driver = { 338 .name = "panel-elida-kd35t133", 339 .of_match_table = kd35t133_of_match, 340 }, 341 .probe = kd35t133_probe, 342 .remove = kd35t133_remove, 343 .shutdown = kd35t133_shutdown, 344 }; 345 module_mipi_dsi_driver(kd35t133_driver); 346 347 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>"); 348 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel"); 349 MODULE_LICENSE("GPL v2"); 350