1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Elida kd35t133 3.5" 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 }; 47 48 static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel) 49 { 50 return container_of(panel, struct kd35t133, panel); 51 } 52 53 static int kd35t133_init_sequence(struct kd35t133 *ctx) 54 { 55 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 56 struct device *dev = ctx->dev; 57 58 /* 59 * Init sequence was supplied by the panel vendor with minimal 60 * documentation. 61 */ 62 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA, 63 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56, 64 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f); 65 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA, 66 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34, 67 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f); 68 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17); 69 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41); 70 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80); 71 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48); 72 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 73 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00); 74 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0); 75 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02); 76 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL, 77 0x20, 0x02); 78 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00); 79 mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3, 80 0xa9, 0x51, 0x2c, 0x82); 81 mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0); 82 83 dev_dbg(dev, "Panel init sequence done\n"); 84 return 0; 85 } 86 87 static int kd35t133_unprepare(struct drm_panel *panel) 88 { 89 struct kd35t133 *ctx = panel_to_kd35t133(panel); 90 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 91 int ret; 92 93 ret = mipi_dsi_dcs_set_display_off(dsi); 94 if (ret < 0) 95 dev_err(ctx->dev, "failed to set display off: %d\n", ret); 96 97 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 98 if (ret < 0) { 99 dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret); 100 return ret; 101 } 102 103 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 104 105 regulator_disable(ctx->iovcc); 106 regulator_disable(ctx->vdd); 107 108 return 0; 109 } 110 111 static int kd35t133_prepare(struct drm_panel *panel) 112 { 113 struct kd35t133 *ctx = panel_to_kd35t133(panel); 114 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 115 int ret; 116 117 dev_dbg(ctx->dev, "Resetting the panel\n"); 118 ret = regulator_enable(ctx->vdd); 119 if (ret < 0) { 120 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret); 121 return ret; 122 } 123 124 ret = regulator_enable(ctx->iovcc); 125 if (ret < 0) { 126 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); 127 goto disable_vdd; 128 } 129 130 msleep(20); 131 132 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 133 usleep_range(10, 20); 134 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 135 136 msleep(20); 137 138 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 139 if (ret < 0) { 140 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret); 141 goto disable_iovcc; 142 } 143 144 msleep(250); 145 146 ret = kd35t133_init_sequence(ctx); 147 if (ret < 0) { 148 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret); 149 goto disable_iovcc; 150 } 151 152 ret = mipi_dsi_dcs_set_display_on(dsi); 153 if (ret < 0) { 154 dev_err(ctx->dev, "Failed to set display on: %d\n", ret); 155 goto disable_iovcc; 156 } 157 158 msleep(50); 159 160 return 0; 161 162 disable_iovcc: 163 regulator_disable(ctx->iovcc); 164 disable_vdd: 165 regulator_disable(ctx->vdd); 166 return ret; 167 } 168 169 static const struct drm_display_mode default_mode = { 170 .hdisplay = 320, 171 .hsync_start = 320 + 130, 172 .hsync_end = 320 + 130 + 4, 173 .htotal = 320 + 130 + 4 + 130, 174 .vdisplay = 480, 175 .vsync_start = 480 + 2, 176 .vsync_end = 480 + 2 + 1, 177 .vtotal = 480 + 2 + 1 + 2, 178 .clock = 17000, 179 .width_mm = 42, 180 .height_mm = 82, 181 }; 182 183 static int kd35t133_get_modes(struct drm_panel *panel, 184 struct drm_connector *connector) 185 { 186 struct kd35t133 *ctx = panel_to_kd35t133(panel); 187 struct drm_display_mode *mode; 188 189 mode = drm_mode_duplicate(connector->dev, &default_mode); 190 if (!mode) { 191 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n", 192 default_mode.hdisplay, default_mode.vdisplay, 193 drm_mode_vrefresh(&default_mode)); 194 return -ENOMEM; 195 } 196 197 drm_mode_set_name(mode); 198 199 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 200 connector->display_info.width_mm = mode->width_mm; 201 connector->display_info.height_mm = mode->height_mm; 202 drm_mode_probed_add(connector, mode); 203 204 return 1; 205 } 206 207 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel) 208 { 209 struct kd35t133 *ctx = panel_to_kd35t133(panel); 210 211 return ctx->orientation; 212 } 213 214 static const struct drm_panel_funcs kd35t133_funcs = { 215 .unprepare = kd35t133_unprepare, 216 .prepare = kd35t133_prepare, 217 .get_modes = kd35t133_get_modes, 218 .get_orientation = kd35t133_get_orientation, 219 }; 220 221 static int kd35t133_probe(struct mipi_dsi_device *dsi) 222 { 223 struct device *dev = &dsi->dev; 224 struct kd35t133 *ctx; 225 int ret; 226 227 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 228 if (!ctx) 229 return -ENOMEM; 230 231 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 232 if (IS_ERR(ctx->reset_gpio)) { 233 dev_err(dev, "cannot get reset gpio\n"); 234 return PTR_ERR(ctx->reset_gpio); 235 } 236 237 ctx->vdd = devm_regulator_get(dev, "vdd"); 238 if (IS_ERR(ctx->vdd)) { 239 ret = PTR_ERR(ctx->vdd); 240 if (ret != -EPROBE_DEFER) 241 dev_err(dev, "Failed to request vdd regulator: %d\n", ret); 242 return ret; 243 } 244 245 ctx->iovcc = devm_regulator_get(dev, "iovcc"); 246 if (IS_ERR(ctx->iovcc)) { 247 ret = PTR_ERR(ctx->iovcc); 248 if (ret != -EPROBE_DEFER) 249 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret); 250 return ret; 251 } 252 253 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation); 254 if (ret < 0) { 255 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret); 256 return ret; 257 } 258 259 mipi_dsi_set_drvdata(dsi, ctx); 260 261 ctx->dev = dev; 262 263 dsi->lanes = 1; 264 dsi->format = MIPI_DSI_FMT_RGB888; 265 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 266 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET | 267 MIPI_DSI_CLOCK_NON_CONTINUOUS; 268 269 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs, 270 DRM_MODE_CONNECTOR_DSI); 271 272 ret = drm_panel_of_backlight(&ctx->panel); 273 if (ret) 274 return ret; 275 276 drm_panel_add(&ctx->panel); 277 278 ret = mipi_dsi_attach(dsi); 279 if (ret < 0) { 280 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret); 281 drm_panel_remove(&ctx->panel); 282 return ret; 283 } 284 285 return 0; 286 } 287 288 static void kd35t133_remove(struct mipi_dsi_device *dsi) 289 { 290 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 291 int ret; 292 293 ret = mipi_dsi_detach(dsi); 294 if (ret < 0) 295 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); 296 297 drm_panel_remove(&ctx->panel); 298 } 299 300 static const struct of_device_id kd35t133_of_match[] = { 301 { .compatible = "elida,kd35t133" }, 302 { /* sentinel */ } 303 }; 304 MODULE_DEVICE_TABLE(of, kd35t133_of_match); 305 306 static struct mipi_dsi_driver kd35t133_driver = { 307 .driver = { 308 .name = "panel-elida-kd35t133", 309 .of_match_table = kd35t133_of_match, 310 }, 311 .probe = kd35t133_probe, 312 .remove = kd35t133_remove, 313 }; 314 module_mipi_dsi_driver(kd35t133_driver); 315 316 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>"); 317 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel"); 318 MODULE_LICENSE("GPL v2"); 319