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