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_of.h> 25 #include <drm/drm_panel.h> 26 27 /* Manufacturer specific Commands send via DSI */ 28 #define KD35T133_CMD_INTERFACEMODECTRL 0xb0 29 #define KD35T133_CMD_FRAMERATECTRL 0xb1 30 #define KD35T133_CMD_DISPLAYINVERSIONCTRL 0xb4 31 #define KD35T133_CMD_DISPLAYFUNCTIONCTRL 0xb6 32 #define KD35T133_CMD_POWERCONTROL1 0xc0 33 #define KD35T133_CMD_POWERCONTROL2 0xc1 34 #define KD35T133_CMD_VCOMCONTROL 0xc5 35 #define KD35T133_CMD_POSITIVEGAMMA 0xe0 36 #define KD35T133_CMD_NEGATIVEGAMMA 0xe1 37 #define KD35T133_CMD_SETIMAGEFUNCTION 0xe9 38 #define KD35T133_CMD_ADJUSTCONTROL3 0xf7 39 40 struct kd35t133 { 41 struct device *dev; 42 struct drm_panel panel; 43 struct gpio_desc *reset_gpio; 44 struct regulator *vdd; 45 struct regulator *iovcc; 46 enum drm_panel_orientation orientation; 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 void kd35t133_init_sequence(struct mipi_dsi_multi_context *dsi_ctx) 55 { 56 /* 57 * Init sequence was supplied by the panel vendor with minimal 58 * documentation. 59 */ 60 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POSITIVEGAMMA, 61 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56, 62 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f); 63 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_NEGATIVEGAMMA, 64 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34, 65 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f); 66 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17); 67 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL2, 0x41); 68 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80); 69 mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_ADDRESS_MODE, 0x48); 70 mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 71 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_INTERFACEMODECTRL, 0x00); 72 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_FRAMERATECTRL, 0xa0); 73 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02); 74 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYFUNCTIONCTRL, 75 0x20, 0x02); 76 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_SETIMAGEFUNCTION, 0x00); 77 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_ADJUSTCONTROL3, 78 0xa9, 0x51, 0x2c, 0x82); 79 mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_ENTER_INVERT_MODE); 80 } 81 82 static int kd35t133_unprepare(struct drm_panel *panel) 83 { 84 struct kd35t133 *ctx = panel_to_kd35t133(panel); 85 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 86 struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi }; 87 88 mipi_dsi_dcs_set_display_off_multi(&dsi_ctx); 89 mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx); 90 if (dsi_ctx.accum_err) 91 return dsi_ctx.accum_err; 92 93 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 94 95 regulator_disable(ctx->iovcc); 96 regulator_disable(ctx->vdd); 97 98 return 0; 99 } 100 101 static int kd35t133_prepare(struct drm_panel *panel) 102 { 103 struct kd35t133 *ctx = panel_to_kd35t133(panel); 104 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); 105 struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi }; 106 107 dev_dbg(ctx->dev, "Resetting the panel\n"); 108 dsi_ctx.accum_err = regulator_enable(ctx->vdd); 109 if (dsi_ctx.accum_err) { 110 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", 111 dsi_ctx.accum_err); 112 return dsi_ctx.accum_err; 113 } 114 115 dsi_ctx.accum_err = regulator_enable(ctx->iovcc); 116 if (dsi_ctx.accum_err) { 117 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", 118 dsi_ctx.accum_err); 119 goto disable_vdd; 120 } 121 122 msleep(20); 123 124 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 125 usleep_range(10, 20); 126 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 127 128 msleep(20); 129 130 mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx); 131 mipi_dsi_msleep(&dsi_ctx, 250); 132 133 kd35t133_init_sequence(&dsi_ctx); 134 if (!dsi_ctx.accum_err) 135 dev_dbg(ctx->dev, "Panel init sequence done\n"); 136 137 mipi_dsi_dcs_set_display_on_multi(&dsi_ctx); 138 mipi_dsi_msleep(&dsi_ctx, 50); 139 140 if (dsi_ctx.accum_err) 141 goto disable_iovcc; 142 143 return 0; 144 145 disable_iovcc: 146 regulator_disable(ctx->iovcc); 147 disable_vdd: 148 regulator_disable(ctx->vdd); 149 return dsi_ctx.accum_err; 150 } 151 152 static const struct drm_display_mode default_mode = { 153 .hdisplay = 320, 154 .hsync_start = 320 + 130, 155 .hsync_end = 320 + 130 + 4, 156 .htotal = 320 + 130 + 4 + 130, 157 .vdisplay = 480, 158 .vsync_start = 480 + 2, 159 .vsync_end = 480 + 2 + 1, 160 .vtotal = 480 + 2 + 1 + 2, 161 .clock = 17000, 162 .width_mm = 42, 163 .height_mm = 82, 164 }; 165 166 static int kd35t133_get_modes(struct drm_panel *panel, 167 struct drm_connector *connector) 168 { 169 struct kd35t133 *ctx = panel_to_kd35t133(panel); 170 struct drm_display_mode *mode; 171 172 mode = drm_mode_duplicate(connector->dev, &default_mode); 173 if (!mode) { 174 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n", 175 default_mode.hdisplay, default_mode.vdisplay, 176 drm_mode_vrefresh(&default_mode)); 177 return -ENOMEM; 178 } 179 180 drm_mode_set_name(mode); 181 182 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 183 connector->display_info.width_mm = mode->width_mm; 184 connector->display_info.height_mm = mode->height_mm; 185 drm_mode_probed_add(connector, mode); 186 187 return 1; 188 } 189 190 static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel) 191 { 192 struct kd35t133 *ctx = panel_to_kd35t133(panel); 193 194 return ctx->orientation; 195 } 196 197 static const struct drm_panel_funcs kd35t133_funcs = { 198 .unprepare = kd35t133_unprepare, 199 .prepare = kd35t133_prepare, 200 .get_modes = kd35t133_get_modes, 201 .get_orientation = kd35t133_get_orientation, 202 }; 203 204 static int kd35t133_probe(struct mipi_dsi_device *dsi) 205 { 206 struct device *dev = &dsi->dev; 207 struct kd35t133 *ctx; 208 int ret; 209 210 ctx = devm_drm_panel_alloc(dev, struct kd35t133, panel, 211 &kd35t133_funcs, DRM_MODE_CONNECTOR_DSI); 212 if (IS_ERR(ctx)) 213 return PTR_ERR(ctx); 214 215 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 216 if (IS_ERR(ctx->reset_gpio)) { 217 dev_err(dev, "cannot get reset gpio\n"); 218 return PTR_ERR(ctx->reset_gpio); 219 } 220 221 ctx->vdd = devm_regulator_get(dev, "vdd"); 222 if (IS_ERR(ctx->vdd)) { 223 ret = PTR_ERR(ctx->vdd); 224 if (ret != -EPROBE_DEFER) 225 dev_err(dev, "Failed to request vdd regulator: %d\n", ret); 226 return ret; 227 } 228 229 ctx->iovcc = devm_regulator_get(dev, "iovcc"); 230 if (IS_ERR(ctx->iovcc)) { 231 ret = PTR_ERR(ctx->iovcc); 232 if (ret != -EPROBE_DEFER) 233 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret); 234 return ret; 235 } 236 237 ret = drm_of_get_panel_orientation(dev->of_node, &ctx->orientation); 238 if (ret < 0) { 239 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret); 240 return ret; 241 } 242 243 mipi_dsi_set_drvdata(dsi, ctx); 244 245 ctx->dev = dev; 246 247 dsi->lanes = 1; 248 dsi->format = MIPI_DSI_FMT_RGB888; 249 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 250 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET | 251 MIPI_DSI_CLOCK_NON_CONTINUOUS; 252 253 ret = drm_panel_of_backlight(&ctx->panel); 254 if (ret) 255 return ret; 256 257 drm_panel_add(&ctx->panel); 258 259 ret = mipi_dsi_attach(dsi); 260 if (ret < 0) { 261 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret); 262 drm_panel_remove(&ctx->panel); 263 return ret; 264 } 265 266 return 0; 267 } 268 269 static void kd35t133_remove(struct mipi_dsi_device *dsi) 270 { 271 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi); 272 int ret; 273 274 ret = mipi_dsi_detach(dsi); 275 if (ret < 0) 276 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); 277 278 drm_panel_remove(&ctx->panel); 279 } 280 281 static const struct of_device_id kd35t133_of_match[] = { 282 { .compatible = "elida,kd35t133" }, 283 { /* sentinel */ } 284 }; 285 MODULE_DEVICE_TABLE(of, kd35t133_of_match); 286 287 static struct mipi_dsi_driver kd35t133_driver = { 288 .driver = { 289 .name = "panel-elida-kd35t133", 290 .of_match_table = kd35t133_of_match, 291 }, 292 .probe = kd35t133_probe, 293 .remove = kd35t133_remove, 294 }; 295 module_mipi_dsi_driver(kd35t133_driver); 296 297 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>"); 298 MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel"); 299 MODULE_LICENSE("GPL v2"); 300