1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Red Hat 4 * Copyright (C) 2015 Sony Mobile Communications Inc. 5 * Author: Werner Johansson <werner.johansson@sonymobile.com> 6 * 7 * Based on AUO panel driver by Rob Clark <robdclark@gmail.com> 8 */ 9 10 #include <linux/backlight.h> 11 #include <linux/delay.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/regulator/consumer.h> 15 16 #include <video/mipi_display.h> 17 18 #include <drm/drm_crtc.h> 19 #include <drm/drm_device.h> 20 #include <drm/drm_mipi_dsi.h> 21 #include <drm/drm_panel.h> 22 23 /* 24 * When power is turned off to this panel a minimum off time of 500ms has to be 25 * observed before powering back on as there's no external reset pin. Keep 26 * track of earliest wakeup time and delay subsequent prepare call accordingly 27 */ 28 #define MIN_POFF_MS (500) 29 30 struct wuxga_nt_panel { 31 struct drm_panel base; 32 struct mipi_dsi_device *dsi; 33 34 struct backlight_device *backlight; 35 struct regulator *supply; 36 37 bool prepared; 38 bool enabled; 39 40 ktime_t earliest_wake; 41 42 const struct drm_display_mode *mode; 43 }; 44 45 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel) 46 { 47 return container_of(panel, struct wuxga_nt_panel, base); 48 } 49 50 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt) 51 { 52 return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi); 53 } 54 55 static int wuxga_nt_panel_disable(struct drm_panel *panel) 56 { 57 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 58 int mipi_ret, bl_ret = 0; 59 60 if (!wuxga_nt->enabled) 61 return 0; 62 63 mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi); 64 65 if (wuxga_nt->backlight) { 66 wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN; 67 wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK; 68 bl_ret = backlight_update_status(wuxga_nt->backlight); 69 } 70 71 wuxga_nt->enabled = false; 72 73 return mipi_ret ? mipi_ret : bl_ret; 74 } 75 76 static int wuxga_nt_panel_unprepare(struct drm_panel *panel) 77 { 78 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 79 80 if (!wuxga_nt->prepared) 81 return 0; 82 83 regulator_disable(wuxga_nt->supply); 84 wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS); 85 wuxga_nt->prepared = false; 86 87 return 0; 88 } 89 90 static int wuxga_nt_panel_prepare(struct drm_panel *panel) 91 { 92 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 93 int ret; 94 s64 enablewait; 95 96 if (wuxga_nt->prepared) 97 return 0; 98 99 /* 100 * If the user re-enabled the panel before the required off-time then 101 * we need to wait the remaining period before re-enabling regulator 102 */ 103 enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real()); 104 105 /* Sanity check, this should never happen */ 106 if (enablewait > MIN_POFF_MS) 107 enablewait = MIN_POFF_MS; 108 109 if (enablewait > 0) 110 msleep(enablewait); 111 112 ret = regulator_enable(wuxga_nt->supply); 113 if (ret < 0) 114 return ret; 115 116 /* 117 * A minimum delay of 250ms is required after power-up until commands 118 * can be sent 119 */ 120 msleep(250); 121 122 ret = wuxga_nt_panel_on(wuxga_nt); 123 if (ret < 0) { 124 dev_err(panel->dev, "failed to set panel on: %d\n", ret); 125 goto poweroff; 126 } 127 128 wuxga_nt->prepared = true; 129 130 return 0; 131 132 poweroff: 133 regulator_disable(wuxga_nt->supply); 134 135 return ret; 136 } 137 138 static int wuxga_nt_panel_enable(struct drm_panel *panel) 139 { 140 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 141 142 if (wuxga_nt->enabled) 143 return 0; 144 145 if (wuxga_nt->backlight) { 146 wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK; 147 wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK; 148 backlight_update_status(wuxga_nt->backlight); 149 } 150 151 wuxga_nt->enabled = true; 152 153 return 0; 154 } 155 156 static const struct drm_display_mode default_mode = { 157 .clock = 164402, 158 .hdisplay = 1920, 159 .hsync_start = 1920 + 152, 160 .hsync_end = 1920 + 152 + 52, 161 .htotal = 1920 + 152 + 52 + 20, 162 .vdisplay = 1200, 163 .vsync_start = 1200 + 24, 164 .vsync_end = 1200 + 24 + 6, 165 .vtotal = 1200 + 24 + 6 + 48, 166 .vrefresh = 60, 167 }; 168 169 static int wuxga_nt_panel_get_modes(struct drm_panel *panel) 170 { 171 struct drm_display_mode *mode; 172 173 mode = drm_mode_duplicate(panel->drm, &default_mode); 174 if (!mode) { 175 dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n", 176 default_mode.hdisplay, default_mode.vdisplay, 177 default_mode.vrefresh); 178 return -ENOMEM; 179 } 180 181 drm_mode_set_name(mode); 182 183 drm_mode_probed_add(panel->connector, mode); 184 185 panel->connector->display_info.width_mm = 217; 186 panel->connector->display_info.height_mm = 136; 187 188 return 1; 189 } 190 191 static const struct drm_panel_funcs wuxga_nt_panel_funcs = { 192 .disable = wuxga_nt_panel_disable, 193 .unprepare = wuxga_nt_panel_unprepare, 194 .prepare = wuxga_nt_panel_prepare, 195 .enable = wuxga_nt_panel_enable, 196 .get_modes = wuxga_nt_panel_get_modes, 197 }; 198 199 static const struct of_device_id wuxga_nt_of_match[] = { 200 { .compatible = "panasonic,vvx10f034n00", }, 201 { } 202 }; 203 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match); 204 205 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt) 206 { 207 struct device *dev = &wuxga_nt->dsi->dev; 208 struct device_node *np; 209 int ret; 210 211 wuxga_nt->mode = &default_mode; 212 213 wuxga_nt->supply = devm_regulator_get(dev, "power"); 214 if (IS_ERR(wuxga_nt->supply)) 215 return PTR_ERR(wuxga_nt->supply); 216 217 np = of_parse_phandle(dev->of_node, "backlight", 0); 218 if (np) { 219 wuxga_nt->backlight = of_find_backlight_by_node(np); 220 of_node_put(np); 221 222 if (!wuxga_nt->backlight) 223 return -EPROBE_DEFER; 224 } 225 226 drm_panel_init(&wuxga_nt->base); 227 wuxga_nt->base.funcs = &wuxga_nt_panel_funcs; 228 wuxga_nt->base.dev = &wuxga_nt->dsi->dev; 229 230 ret = drm_panel_add(&wuxga_nt->base); 231 if (ret < 0) 232 goto put_backlight; 233 234 return 0; 235 236 put_backlight: 237 if (wuxga_nt->backlight) 238 put_device(&wuxga_nt->backlight->dev); 239 240 return ret; 241 } 242 243 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt) 244 { 245 if (wuxga_nt->base.dev) 246 drm_panel_remove(&wuxga_nt->base); 247 248 if (wuxga_nt->backlight) 249 put_device(&wuxga_nt->backlight->dev); 250 } 251 252 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi) 253 { 254 struct wuxga_nt_panel *wuxga_nt; 255 int ret; 256 257 dsi->lanes = 4; 258 dsi->format = MIPI_DSI_FMT_RGB888; 259 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 260 MIPI_DSI_MODE_VIDEO_HSE | 261 MIPI_DSI_CLOCK_NON_CONTINUOUS | 262 MIPI_DSI_MODE_LPM; 263 264 wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL); 265 if (!wuxga_nt) 266 return -ENOMEM; 267 268 mipi_dsi_set_drvdata(dsi, wuxga_nt); 269 270 wuxga_nt->dsi = dsi; 271 272 ret = wuxga_nt_panel_add(wuxga_nt); 273 if (ret < 0) 274 return ret; 275 276 return mipi_dsi_attach(dsi); 277 } 278 279 static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi) 280 { 281 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi); 282 int ret; 283 284 ret = wuxga_nt_panel_disable(&wuxga_nt->base); 285 if (ret < 0) 286 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret); 287 288 ret = mipi_dsi_detach(dsi); 289 if (ret < 0) 290 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret); 291 292 wuxga_nt_panel_del(wuxga_nt); 293 294 return 0; 295 } 296 297 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi) 298 { 299 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi); 300 301 wuxga_nt_panel_disable(&wuxga_nt->base); 302 } 303 304 static struct mipi_dsi_driver wuxga_nt_panel_driver = { 305 .driver = { 306 .name = "panel-panasonic-vvx10f034n00", 307 .of_match_table = wuxga_nt_of_match, 308 }, 309 .probe = wuxga_nt_panel_probe, 310 .remove = wuxga_nt_panel_remove, 311 .shutdown = wuxga_nt_panel_shutdown, 312 }; 313 module_mipi_dsi_driver(wuxga_nt_panel_driver); 314 315 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>"); 316 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver"); 317 MODULE_LICENSE("GPL v2"); 318