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/delay.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/regulator/consumer.h> 14 15 #include <video/mipi_display.h> 16 17 #include <drm/drm_crtc.h> 18 #include <drm/drm_device.h> 19 #include <drm/drm_mipi_dsi.h> 20 #include <drm/drm_panel.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 regulator *supply; 34 35 bool prepared; 36 bool enabled; 37 38 ktime_t earliest_wake; 39 40 const struct drm_display_mode *mode; 41 }; 42 43 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel) 44 { 45 return container_of(panel, struct wuxga_nt_panel, base); 46 } 47 48 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt) 49 { 50 return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi); 51 } 52 53 static int wuxga_nt_panel_disable(struct drm_panel *panel) 54 { 55 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 56 int mipi_ret, bl_ret = 0; 57 58 if (!wuxga_nt->enabled) 59 return 0; 60 61 mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi); 62 63 wuxga_nt->enabled = false; 64 65 return mipi_ret ? mipi_ret : bl_ret; 66 } 67 68 static int wuxga_nt_panel_unprepare(struct drm_panel *panel) 69 { 70 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 71 72 if (!wuxga_nt->prepared) 73 return 0; 74 75 regulator_disable(wuxga_nt->supply); 76 wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS); 77 wuxga_nt->prepared = false; 78 79 return 0; 80 } 81 82 static int wuxga_nt_panel_prepare(struct drm_panel *panel) 83 { 84 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 85 int ret; 86 s64 enablewait; 87 88 if (wuxga_nt->prepared) 89 return 0; 90 91 /* 92 * If the user re-enabled the panel before the required off-time then 93 * we need to wait the remaining period before re-enabling regulator 94 */ 95 enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real()); 96 97 /* Sanity check, this should never happen */ 98 if (enablewait > MIN_POFF_MS) 99 enablewait = MIN_POFF_MS; 100 101 if (enablewait > 0) 102 msleep(enablewait); 103 104 ret = regulator_enable(wuxga_nt->supply); 105 if (ret < 0) 106 return ret; 107 108 /* 109 * A minimum delay of 250ms is required after power-up until commands 110 * can be sent 111 */ 112 msleep(250); 113 114 ret = wuxga_nt_panel_on(wuxga_nt); 115 if (ret < 0) { 116 dev_err(panel->dev, "failed to set panel on: %d\n", ret); 117 goto poweroff; 118 } 119 120 wuxga_nt->prepared = true; 121 122 return 0; 123 124 poweroff: 125 regulator_disable(wuxga_nt->supply); 126 127 return ret; 128 } 129 130 static int wuxga_nt_panel_enable(struct drm_panel *panel) 131 { 132 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel); 133 134 if (wuxga_nt->enabled) 135 return 0; 136 137 wuxga_nt->enabled = true; 138 139 return 0; 140 } 141 142 static const struct drm_display_mode default_mode = { 143 .clock = 164402, 144 .hdisplay = 1920, 145 .hsync_start = 1920 + 152, 146 .hsync_end = 1920 + 152 + 52, 147 .htotal = 1920 + 152 + 52 + 20, 148 .vdisplay = 1200, 149 .vsync_start = 1200 + 24, 150 .vsync_end = 1200 + 24 + 6, 151 .vtotal = 1200 + 24 + 6 + 48, 152 .vrefresh = 60, 153 }; 154 155 static int wuxga_nt_panel_get_modes(struct drm_panel *panel, 156 struct drm_connector *connector) 157 { 158 struct drm_display_mode *mode; 159 160 mode = drm_mode_duplicate(connector->dev, &default_mode); 161 if (!mode) { 162 dev_err(panel->dev, "failed to add mode %ux%u@%u\n", 163 default_mode.hdisplay, default_mode.vdisplay, 164 default_mode.vrefresh); 165 return -ENOMEM; 166 } 167 168 drm_mode_set_name(mode); 169 170 drm_mode_probed_add(connector, mode); 171 172 connector->display_info.width_mm = 217; 173 connector->display_info.height_mm = 136; 174 175 return 1; 176 } 177 178 static const struct drm_panel_funcs wuxga_nt_panel_funcs = { 179 .disable = wuxga_nt_panel_disable, 180 .unprepare = wuxga_nt_panel_unprepare, 181 .prepare = wuxga_nt_panel_prepare, 182 .enable = wuxga_nt_panel_enable, 183 .get_modes = wuxga_nt_panel_get_modes, 184 }; 185 186 static const struct of_device_id wuxga_nt_of_match[] = { 187 { .compatible = "panasonic,vvx10f034n00", }, 188 { } 189 }; 190 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match); 191 192 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt) 193 { 194 struct device *dev = &wuxga_nt->dsi->dev; 195 int ret; 196 197 wuxga_nt->mode = &default_mode; 198 199 wuxga_nt->supply = devm_regulator_get(dev, "power"); 200 if (IS_ERR(wuxga_nt->supply)) 201 return PTR_ERR(wuxga_nt->supply); 202 203 drm_panel_init(&wuxga_nt->base, &wuxga_nt->dsi->dev, 204 &wuxga_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI); 205 206 ret = drm_panel_of_backlight(&wuxga_nt->base); 207 if (ret) 208 return ret; 209 210 return drm_panel_add(&wuxga_nt->base); 211 } 212 213 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt) 214 { 215 if (wuxga_nt->base.dev) 216 drm_panel_remove(&wuxga_nt->base); 217 } 218 219 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi) 220 { 221 struct wuxga_nt_panel *wuxga_nt; 222 int ret; 223 224 dsi->lanes = 4; 225 dsi->format = MIPI_DSI_FMT_RGB888; 226 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 227 MIPI_DSI_MODE_VIDEO_HSE | 228 MIPI_DSI_CLOCK_NON_CONTINUOUS | 229 MIPI_DSI_MODE_LPM; 230 231 wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL); 232 if (!wuxga_nt) 233 return -ENOMEM; 234 235 mipi_dsi_set_drvdata(dsi, wuxga_nt); 236 237 wuxga_nt->dsi = dsi; 238 239 ret = wuxga_nt_panel_add(wuxga_nt); 240 if (ret < 0) 241 return ret; 242 243 return mipi_dsi_attach(dsi); 244 } 245 246 static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi) 247 { 248 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi); 249 int ret; 250 251 ret = drm_panel_disable(&wuxga_nt->base); 252 if (ret < 0) 253 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret); 254 255 ret = mipi_dsi_detach(dsi); 256 if (ret < 0) 257 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret); 258 259 wuxga_nt_panel_del(wuxga_nt); 260 261 return 0; 262 } 263 264 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi) 265 { 266 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi); 267 268 drm_panel_disable(&wuxga_nt->base); 269 } 270 271 static struct mipi_dsi_driver wuxga_nt_panel_driver = { 272 .driver = { 273 .name = "panel-panasonic-vvx10f034n00", 274 .of_match_table = wuxga_nt_of_match, 275 }, 276 .probe = wuxga_nt_panel_probe, 277 .remove = wuxga_nt_panel_remove, 278 .shutdown = wuxga_nt_panel_shutdown, 279 }; 280 module_mipi_dsi_driver(wuxga_nt_panel_driver); 281 282 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>"); 283 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver"); 284 MODULE_LICENSE("GPL v2"); 285