1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * MIPI-DSI Samsung s6d16d0 panel driver. This is a 864x480 4 * AMOLED panel with a command-only DSI interface. 5 */ 6 7 #include <drm/drm_modes.h> 8 #include <drm/drm_mipi_dsi.h> 9 #include <drm/drm_panel.h> 10 #include <drm/drm_print.h> 11 12 #include <linux/gpio/consumer.h> 13 #include <linux/regulator/consumer.h> 14 #include <linux/delay.h> 15 #include <linux/of_device.h> 16 #include <linux/module.h> 17 18 struct s6d16d0 { 19 struct device *dev; 20 struct drm_panel panel; 21 struct regulator *supply; 22 struct gpio_desc *reset_gpio; 23 }; 24 25 /* 26 * The timings are not very helpful as the display is used in 27 * command mode. 28 */ 29 static const struct drm_display_mode samsung_s6d16d0_mode = { 30 /* HS clock, (htotal*vtotal*vrefresh)/1000 */ 31 .clock = 420160, 32 .hdisplay = 864, 33 .hsync_start = 864 + 154, 34 .hsync_end = 864 + 154 + 16, 35 .htotal = 864 + 154 + 16 + 32, 36 .vdisplay = 480, 37 .vsync_start = 480 + 1, 38 .vsync_end = 480 + 1 + 1, 39 .vtotal = 480 + 1 + 1 + 1, 40 /* 41 * This depends on the clocking HS vs LP rate, this value 42 * is calculated as: 43 * vrefresh = (clock * 1000) / (htotal*vtotal) 44 */ 45 .vrefresh = 816, 46 .width_mm = 84, 47 .height_mm = 48, 48 }; 49 50 static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel) 51 { 52 return container_of(panel, struct s6d16d0, panel); 53 } 54 55 static int s6d16d0_unprepare(struct drm_panel *panel) 56 { 57 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 58 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 59 int ret; 60 61 /* Enter sleep mode */ 62 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 63 if (ret) { 64 DRM_DEV_ERROR(s6->dev, "failed to enter sleep mode (%d)\n", 65 ret); 66 return ret; 67 } 68 69 /* Assert RESET */ 70 gpiod_set_value_cansleep(s6->reset_gpio, 1); 71 regulator_disable(s6->supply); 72 73 return 0; 74 } 75 76 static int s6d16d0_prepare(struct drm_panel *panel) 77 { 78 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 79 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 80 int ret; 81 82 ret = regulator_enable(s6->supply); 83 if (ret) { 84 DRM_DEV_ERROR(s6->dev, "failed to enable supply (%d)\n", ret); 85 return ret; 86 } 87 88 /* Assert RESET */ 89 gpiod_set_value_cansleep(s6->reset_gpio, 1); 90 udelay(10); 91 /* De-assert RESET */ 92 gpiod_set_value_cansleep(s6->reset_gpio, 0); 93 msleep(120); 94 95 /* Enabe tearing mode: send TE (tearing effect) at VBLANK */ 96 ret = mipi_dsi_dcs_set_tear_on(dsi, 97 MIPI_DSI_DCS_TEAR_MODE_VBLANK); 98 if (ret) { 99 DRM_DEV_ERROR(s6->dev, "failed to enable vblank TE (%d)\n", 100 ret); 101 return ret; 102 } 103 /* Exit sleep mode and power on */ 104 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 105 if (ret) { 106 DRM_DEV_ERROR(s6->dev, "failed to exit sleep mode (%d)\n", 107 ret); 108 return ret; 109 } 110 111 return 0; 112 } 113 114 static int s6d16d0_enable(struct drm_panel *panel) 115 { 116 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 117 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 118 int ret; 119 120 ret = mipi_dsi_dcs_set_display_on(dsi); 121 if (ret) { 122 DRM_DEV_ERROR(s6->dev, "failed to turn display on (%d)\n", 123 ret); 124 return ret; 125 } 126 127 return 0; 128 } 129 130 static int s6d16d0_disable(struct drm_panel *panel) 131 { 132 struct s6d16d0 *s6 = panel_to_s6d16d0(panel); 133 struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev); 134 int ret; 135 136 ret = mipi_dsi_dcs_set_display_off(dsi); 137 if (ret) { 138 DRM_DEV_ERROR(s6->dev, "failed to turn display off (%d)\n", 139 ret); 140 return ret; 141 } 142 143 return 0; 144 } 145 146 static int s6d16d0_get_modes(struct drm_panel *panel, 147 struct drm_connector *connector) 148 { 149 struct drm_display_mode *mode; 150 151 mode = drm_mode_duplicate(connector->dev, &samsung_s6d16d0_mode); 152 if (!mode) { 153 DRM_ERROR("bad mode or failed to add mode\n"); 154 return -EINVAL; 155 } 156 drm_mode_set_name(mode); 157 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 158 159 connector->display_info.width_mm = mode->width_mm; 160 connector->display_info.height_mm = mode->height_mm; 161 162 drm_mode_probed_add(connector, mode); 163 164 return 1; /* Number of modes */ 165 } 166 167 static const struct drm_panel_funcs s6d16d0_drm_funcs = { 168 .disable = s6d16d0_disable, 169 .unprepare = s6d16d0_unprepare, 170 .prepare = s6d16d0_prepare, 171 .enable = s6d16d0_enable, 172 .get_modes = s6d16d0_get_modes, 173 }; 174 175 static int s6d16d0_probe(struct mipi_dsi_device *dsi) 176 { 177 struct device *dev = &dsi->dev; 178 struct s6d16d0 *s6; 179 int ret; 180 181 s6 = devm_kzalloc(dev, sizeof(struct s6d16d0), GFP_KERNEL); 182 if (!s6) 183 return -ENOMEM; 184 185 mipi_dsi_set_drvdata(dsi, s6); 186 s6->dev = dev; 187 188 dsi->lanes = 2; 189 dsi->format = MIPI_DSI_FMT_RGB888; 190 dsi->hs_rate = 420160000; 191 dsi->lp_rate = 19200000; 192 /* 193 * This display uses command mode so no MIPI_DSI_MODE_VIDEO 194 * or MIPI_DSI_MODE_VIDEO_SYNC_PULSE 195 * 196 * As we only send commands we do not need to be continuously 197 * clocked. 198 */ 199 dsi->mode_flags = 200 MIPI_DSI_CLOCK_NON_CONTINUOUS | 201 MIPI_DSI_MODE_EOT_PACKET; 202 203 s6->supply = devm_regulator_get(dev, "vdd1"); 204 if (IS_ERR(s6->supply)) 205 return PTR_ERR(s6->supply); 206 207 /* This asserts RESET by default */ 208 s6->reset_gpio = devm_gpiod_get_optional(dev, "reset", 209 GPIOD_OUT_HIGH); 210 if (IS_ERR(s6->reset_gpio)) { 211 ret = PTR_ERR(s6->reset_gpio); 212 if (ret != -EPROBE_DEFER) 213 DRM_DEV_ERROR(dev, "failed to request GPIO (%d)\n", 214 ret); 215 return ret; 216 } 217 218 drm_panel_init(&s6->panel, dev, &s6d16d0_drm_funcs, 219 DRM_MODE_CONNECTOR_DSI); 220 221 ret = drm_panel_add(&s6->panel); 222 if (ret < 0) 223 return ret; 224 225 ret = mipi_dsi_attach(dsi); 226 if (ret < 0) 227 drm_panel_remove(&s6->panel); 228 229 return ret; 230 } 231 232 static int s6d16d0_remove(struct mipi_dsi_device *dsi) 233 { 234 struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi); 235 236 mipi_dsi_detach(dsi); 237 drm_panel_remove(&s6->panel); 238 239 return 0; 240 } 241 242 static const struct of_device_id s6d16d0_of_match[] = { 243 { .compatible = "samsung,s6d16d0" }, 244 { } 245 }; 246 MODULE_DEVICE_TABLE(of, s6d16d0_of_match); 247 248 static struct mipi_dsi_driver s6d16d0_driver = { 249 .probe = s6d16d0_probe, 250 .remove = s6d16d0_remove, 251 .driver = { 252 .name = "panel-samsung-s6d16d0", 253 .of_match_table = s6d16d0_of_match, 254 }, 255 }; 256 module_mipi_dsi_driver(s6d16d0_driver); 257 258 MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>"); 259 MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver"); 260 MODULE_LICENSE("GPL v2"); 261