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 #define dsi_dcs_write_seq(dsi, cmd, seq...) do { \ 55 static const u8 b[] = { cmd, seq }; \ 56 int ret; \ 57 ret = mipi_dsi_dcs_write_buffer(dsi, b, ARRAY_SIZE(b)); \ 58 if (ret < 0) \ 59 return ret; \ 60 } while (0) 61 62 static int kd35t133_init_sequence(struct kd35t133 *ctx) 63 { 64 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 65 struct device *dev = ctx->dev; 66 67 /* 68 * Init sequence was supplied by the panel vendor with minimal 69 * documentation. 70 */ 71 dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA, 72 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56, 73 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f); 74 dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA, 75 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34, 76 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f); 77 dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17); 78 dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41); 79 dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80); 80 dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48); 81 dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 82 dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00); 83 dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0); 84 dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02); 85 dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL, 86 0x20, 0x02); 87 dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00); 88 dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3, 89 0xa9, 0x51, 0x2c, 0x82); 90 mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0); 91 92 dev_dbg(dev, "Panel init sequence done\n"); 93 return 0; 94 } 95 96 static int kd35t133_unprepare(struct drm_panel *panel) 97 { 98 struct kd35t133 *ctx = panel_to_kd35t133(panel); 99 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 100 int ret; 101 102 if (!ctx->prepared) 103 return 0; 104 105 ret = mipi_dsi_dcs_set_display_off(dsi); 106 if (ret < 0) 107 dev_err(ctx->dev, "failed to set display off: %d\n", ret); 108 109 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 110 if (ret < 0) { 111 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret); 112 return ret; 113 } 114 115 regulator_disable(ctx->iovcc); 116 regulator_disable(ctx->vdd); 117 118 ctx->prepared = false; 119 120 return 0; 121 } 122 123 static int kd35t133_prepare(struct drm_panel *panel) 124 { 125 struct kd35t133 *ctx = panel_to_kd35t133(panel); 126 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 127 int ret; 128 129 if (ctx->prepared) 130 return 0; 131 132 dev_dbg(ctx->dev, "Resetting the panel\n"); 133 ret = regulator_enable(ctx->vdd); 134 if (ret < 0) { 135 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret); 136 return ret; 137 } 138 139 ret = regulator_enable(ctx->iovcc); 140 if (ret < 0) { 141 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); 142 goto disable_vdd; 143 } 144 145 msleep(20); 146 147 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 148 usleep_range(10, 20); 149 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 150 151 msleep(20); 152 153 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 154 if (ret < 0) { 155 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret); 156 goto disable_iovcc; 157 } 158 159 msleep(250); 160 161 ret = kd35t133_init_sequence(ctx); 162 if (ret < 0) { 163 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret); 164 goto disable_iovcc; 165 } 166 167 ret = mipi_dsi_dcs_set_display_on(dsi); 168 if (ret < 0) { 169 dev_err(ctx->dev, "Failed to set display on: %d\n", ret); 170 goto disable_iovcc; 171 } 172 173 msleep(50); 174 175 ctx->prepared = true; 176 177 return 0; 178 179 disable_iovcc: 180 regulator_disable(ctx->iovcc); 181 disable_vdd: 182 regulator_disable(ctx->vdd); 183 return ret; 184 } 185 186 static const struct drm_display_mode default_mode = { 187 .hdisplay = 320, 188 .hsync_start = 320 + 130, 189 .hsync_end = 320 + 130 + 4, 190 .htotal = 320 + 130 + 4 + 130, 191 .vdisplay = 480, 192 .vsync_start = 480 + 2, 193 .vsync_end = 480 + 2 + 1, 194 .vtotal = 480 + 2 + 1 + 2, 195 .clock = 17000, 196 .width_mm = 42, 197 .height_mm = 82, 198 }; 199 200 static int kd35t133_get_modes(struct drm_panel *panel, 201 struct drm_connector *connector) 202 { 203 struct kd35t133 *ctx = panel_to_kd35t133(panel); 204 struct drm_display_mode *mode; 205 206 mode = drm_mode_duplicate(connector->dev, &default_mode); 207 if (!mode) { 208 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n", 209 default_mode.hdisplay, default_mode.vdisplay, 210 drm_mode_vrefresh(&default_mode)); 211 return -ENOMEM; 212 } 213 214 drm_mode_set_name(mode); 215 216 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 217 connector->display_info.width_mm = mode->width_mm; 218 connector->display_info.height_mm = mode->height_mm; 219 drm_mode_probed_add(connector, mode); 220 drm_connector_set_panel_orientation(connector, ctx->orientation); 221 222 return 1; 223 } 224 225 static const struct drm_panel_funcs kd35t133_funcs = { 226 .unprepare = kd35t133_unprepare, 227 .prepare = kd35t133_prepare, 228 .get_modes = kd35t133_get_modes, 229 }; 230 231 static int kd35t133_probe(struct mipi_dsi_device *dsi) 232 { 233 struct device *dev = &dsi->dev; 234 struct kd35t133 *ctx; 235 int ret; 236 237 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 238 if (!ctx) 239 return -ENOMEM; 240 241 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 242 if (IS_ERR(ctx->reset_gpio)) { 243 dev_err(dev, "cannot get reset gpio\n"); 244 return PTR_ERR(ctx->reset_gpio); 245 } 246 247 ctx->vdd = devm_regulator_get(dev, "vdd"); 248 if (IS_ERR(ctx->vdd)) { 249 ret = PTR_ERR(ctx->vdd); 250 if (ret != -EPROBE_DEFER) 251 dev_err(dev, "Failed to request vdd regulator: %d\n", ret); 252 return ret; 253 } 254 255 ctx->iovcc = devm_regulator_get(dev, "iovcc"); 256 if (IS_ERR(ctx->iovcc)) { 257 ret = PTR_ERR(ctx->iovcc); 258 if (ret != -EPROBE_DEFER) 259 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret); 260 return ret; 261 } 262 263 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation); 264 if (ret < 0) { 265 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret); 266 return ret; 267 } 268 269 mipi_dsi_set_drvdata(dsi, ctx); 270 271 ctx->dev = dev; 272 273 dsi->lanes = 1; 274 dsi->format = MIPI_DSI_FMT_RGB888; 275 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 276 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET | 277 MIPI_DSI_CLOCK_NON_CONTINUOUS; 278 279 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs, 280 DRM_MODE_CONNECTOR_DSI); 281 282 ret = drm_panel_of_backlight(&ctx->panel); 283 if (ret) 284 return ret; 285 286 drm_panel_add(&ctx->panel); 287 288 ret = mipi_dsi_attach(dsi); 289 if (ret < 0) { 290 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret); 291 drm_panel_remove(&ctx->panel); 292 return ret; 293 } 294 295 return 0; 296 } 297 298 static void kd35t133_shutdown(struct mipi_dsi_device *dsi) 299 { 300 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 301 int ret; 302 303 ret = drm_panel_unprepare(&ctx->panel); 304 if (ret < 0) 305 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret); 306 307 ret = drm_panel_disable(&ctx->panel); 308 if (ret < 0) 309 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret); 310 } 311 312 static int kd35t133_remove(struct mipi_dsi_device *dsi) 313 { 314 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 315 int ret; 316 317 kd35t133_shutdown(dsi); 318 319 ret = mipi_dsi_detach(dsi); 320 if (ret < 0) 321 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); 322 323 drm_panel_remove(&ctx->panel); 324 325 return 0; 326 } 327 328 static const struct of_device_id kd35t133_of_match[] = { 329 { .compatible = "elida,kd35t133" }, 330 { /* sentinel */ } 331 }; 332 MODULE_DEVICE_TABLE(of, kd35t133_of_match); 333 334 static struct mipi_dsi_driver kd35t133_driver = { 335 .driver = { 336 .name = "panel-elida-kd35t133", 337 .of_match_table = kd35t133_of_match, 338 }, 339 .probe = kd35t133_probe, 340 .remove = kd35t133_remove, 341 .shutdown = kd35t133_shutdown, 342 }; 343 module_mipi_dsi_driver(kd35t133_driver); 344 345 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>"); 346 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel"); 347 MODULE_LICENSE("GPL v2"); 348