1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2018 Amarula Solutions 4 * Author: Jagan Teki <jagan@amarulasolutions.com> 5 */ 6 7 #include <drm/drm_mipi_dsi.h> 8 #include <drm/drm_modes.h> 9 #include <drm/drm_panel.h> 10 #include <drm/drm_print.h> 11 12 #include <linux/backlight.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/delay.h> 15 #include <linux/module.h> 16 #include <linux/of_device.h> 17 #include <linux/regulator/consumer.h> 18 19 #define FEIYANG_INIT_CMD_LEN 2 20 21 struct feiyang { 22 struct drm_panel panel; 23 struct mipi_dsi_device *dsi; 24 25 struct backlight_device *backlight; 26 struct regulator *dvdd; 27 struct regulator *avdd; 28 struct gpio_desc *reset; 29 }; 30 31 static inline struct feiyang *panel_to_feiyang(struct drm_panel *panel) 32 { 33 return container_of(panel, struct feiyang, panel); 34 } 35 36 struct feiyang_init_cmd { 37 u8 data[FEIYANG_INIT_CMD_LEN]; 38 }; 39 40 static const struct feiyang_init_cmd feiyang_init_cmds[] = { 41 { .data = { 0x80, 0x58 } }, 42 { .data = { 0x81, 0x47 } }, 43 { .data = { 0x82, 0xD4 } }, 44 { .data = { 0x83, 0x88 } }, 45 { .data = { 0x84, 0xA9 } }, 46 { .data = { 0x85, 0xC3 } }, 47 { .data = { 0x86, 0x82 } }, 48 }; 49 50 static int feiyang_prepare(struct drm_panel *panel) 51 { 52 struct feiyang *ctx = panel_to_feiyang(panel); 53 struct mipi_dsi_device *dsi = ctx->dsi; 54 unsigned int i; 55 int ret; 56 57 ret = regulator_enable(ctx->dvdd); 58 if (ret) 59 return ret; 60 61 /* T1 (dvdd start + dvdd rise) 0 < T1 <= 10ms */ 62 msleep(10); 63 64 ret = regulator_enable(ctx->avdd); 65 if (ret) 66 return ret; 67 68 /* T3 (dvdd rise + avdd start + avdd rise) T3 >= 20ms */ 69 msleep(20); 70 71 gpiod_set_value(ctx->reset, 0); 72 73 /* 74 * T5 + T6 (avdd rise + video & logic signal rise) 75 * T5 >= 10ms, 0 < T6 <= 10ms 76 */ 77 msleep(20); 78 79 gpiod_set_value(ctx->reset, 1); 80 81 /* T12 (video & logic signal rise + backlight rise) T12 >= 200ms */ 82 msleep(200); 83 84 for (i = 0; i < ARRAY_SIZE(feiyang_init_cmds); i++) { 85 const struct feiyang_init_cmd *cmd = 86 &feiyang_init_cmds[i]; 87 88 ret = mipi_dsi_dcs_write_buffer(dsi, cmd->data, 89 FEIYANG_INIT_CMD_LEN); 90 if (ret < 0) 91 return ret; 92 } 93 94 return 0; 95 } 96 97 static int feiyang_enable(struct drm_panel *panel) 98 { 99 struct feiyang *ctx = panel_to_feiyang(panel); 100 101 /* T12 (video & logic signal rise + backlight rise) T12 >= 200ms */ 102 msleep(200); 103 104 mipi_dsi_dcs_set_display_on(ctx->dsi); 105 backlight_enable(ctx->backlight); 106 107 return 0; 108 } 109 110 static int feiyang_disable(struct drm_panel *panel) 111 { 112 struct feiyang *ctx = panel_to_feiyang(panel); 113 114 backlight_disable(ctx->backlight); 115 return mipi_dsi_dcs_set_display_off(ctx->dsi); 116 } 117 118 static int feiyang_unprepare(struct drm_panel *panel) 119 { 120 struct feiyang *ctx = panel_to_feiyang(panel); 121 int ret; 122 123 ret = mipi_dsi_dcs_set_display_off(ctx->dsi); 124 if (ret < 0) 125 DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n", 126 ret); 127 128 ret = mipi_dsi_dcs_enter_sleep_mode(ctx->dsi); 129 if (ret < 0) 130 DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n", 131 ret); 132 133 /* T13 (backlight fall + video & logic signal fall) T13 >= 200ms */ 134 msleep(200); 135 136 gpiod_set_value(ctx->reset, 0); 137 138 regulator_disable(ctx->avdd); 139 140 /* T11 (dvdd rise to fall) 0 < T11 <= 10ms */ 141 msleep(10); 142 143 regulator_disable(ctx->dvdd); 144 145 return 0; 146 } 147 148 static const struct drm_display_mode feiyang_default_mode = { 149 .clock = 55000, 150 151 .hdisplay = 1024, 152 .hsync_start = 1024 + 310, 153 .hsync_end = 1024 + 310 + 20, 154 .htotal = 1024 + 310 + 20 + 90, 155 156 .vdisplay = 600, 157 .vsync_start = 600 + 12, 158 .vsync_end = 600 + 12 + 2, 159 .vtotal = 600 + 12 + 2 + 21, 160 .vrefresh = 60, 161 162 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, 163 }; 164 165 static int feiyang_get_modes(struct drm_panel *panel) 166 { 167 struct drm_connector *connector = panel->connector; 168 struct feiyang *ctx = panel_to_feiyang(panel); 169 struct drm_display_mode *mode; 170 171 mode = drm_mode_duplicate(panel->drm, &feiyang_default_mode); 172 if (!mode) { 173 DRM_DEV_ERROR(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n", 174 feiyang_default_mode.hdisplay, 175 feiyang_default_mode.vdisplay, 176 feiyang_default_mode.vrefresh); 177 return -ENOMEM; 178 } 179 180 drm_mode_set_name(mode); 181 182 drm_mode_probed_add(connector, mode); 183 184 return 1; 185 } 186 187 static const struct drm_panel_funcs feiyang_funcs = { 188 .disable = feiyang_disable, 189 .unprepare = feiyang_unprepare, 190 .prepare = feiyang_prepare, 191 .enable = feiyang_enable, 192 .get_modes = feiyang_get_modes, 193 }; 194 195 static int feiyang_dsi_probe(struct mipi_dsi_device *dsi) 196 { 197 struct feiyang *ctx; 198 int ret; 199 200 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL); 201 if (!ctx) 202 return -ENOMEM; 203 204 mipi_dsi_set_drvdata(dsi, ctx); 205 ctx->dsi = dsi; 206 207 drm_panel_init(&ctx->panel); 208 ctx->panel.dev = &dsi->dev; 209 ctx->panel.funcs = &feiyang_funcs; 210 211 ctx->dvdd = devm_regulator_get(&dsi->dev, "dvdd"); 212 if (IS_ERR(ctx->dvdd)) { 213 DRM_DEV_ERROR(&dsi->dev, "Couldn't get dvdd regulator\n"); 214 return PTR_ERR(ctx->dvdd); 215 } 216 217 ctx->avdd = devm_regulator_get(&dsi->dev, "avdd"); 218 if (IS_ERR(ctx->avdd)) { 219 DRM_DEV_ERROR(&dsi->dev, "Couldn't get avdd regulator\n"); 220 return PTR_ERR(ctx->avdd); 221 } 222 223 ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW); 224 if (IS_ERR(ctx->reset)) { 225 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n"); 226 return PTR_ERR(ctx->reset); 227 } 228 229 ctx->backlight = devm_of_find_backlight(&dsi->dev); 230 if (IS_ERR(ctx->backlight)) 231 return PTR_ERR(ctx->backlight); 232 233 ret = drm_panel_add(&ctx->panel); 234 if (ret < 0) 235 return ret; 236 237 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST; 238 dsi->format = MIPI_DSI_FMT_RGB888; 239 dsi->lanes = 4; 240 241 return mipi_dsi_attach(dsi); 242 } 243 244 static int feiyang_dsi_remove(struct mipi_dsi_device *dsi) 245 { 246 struct feiyang *ctx = mipi_dsi_get_drvdata(dsi); 247 248 mipi_dsi_detach(dsi); 249 drm_panel_remove(&ctx->panel); 250 251 return 0; 252 } 253 254 static const struct of_device_id feiyang_of_match[] = { 255 { .compatible = "feiyang,fy07024di26a30d", }, 256 { /* sentinel */ } 257 }; 258 MODULE_DEVICE_TABLE(of, feiyang_of_match); 259 260 static struct mipi_dsi_driver feiyang_driver = { 261 .probe = feiyang_dsi_probe, 262 .remove = feiyang_dsi_remove, 263 .driver = { 264 .name = "feiyang-fy07024di26a30d", 265 .of_match_table = feiyang_of_match, 266 }, 267 }; 268 module_mipi_dsi_driver(feiyang_driver); 269 270 MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>"); 271 MODULE_DESCRIPTION("Feiyang FY07024DI26A30-D MIPI-DSI LCD panel"); 272 MODULE_LICENSE("GPL"); 273