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