drivers/video/fbdev/omap2/omapfb/dss/display.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/video/omap2/dss/display.c
   4  *
   5  * Copyright (C) 2009 Nokia Corporation
   6  * Author: Tomi Valkeinen <[email protected]>
   7  *
   8  * Some code and ideas taken from drivers/video/omap/ driver
   9  * by Imre Deak.
  10  */
  11
  12 #define DSS_SUBSYS_NAME "DISPLAY"
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/jiffies.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/of.h>
  19
  20 #include <video/omapfb_dss.h>
  21 #include "dss.h"
  22 #include "dss_features.h"
  23
  24 void omapdss_default_get_resolution(struct omap_dss_device *dssdev,
  25                         u16 *xres, u16 *yres)
  26 {
  27         *xres = dssdev->panel.timings.x_res;
  28         *yres = dssdev->panel.timings.y_res;
  29 }
  30 EXPORT_SYMBOL(omapdss_default_get_resolution);
  31
  32 int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
  33 {
  34         switch (dssdev->type) {
  35         case OMAP_DISPLAY_TYPE_DPI:
  36                 if (dssdev->phy.dpi.data_lines == 24)
  37                         return 24;
  38                 else
  39                         return 16;
  40
  41         case OMAP_DISPLAY_TYPE_DBI:
  42                 if (dssdev->ctrl.pixel_size == 24)
  43                         return 24;
  44                 else
  45                         return 16;
  46         case OMAP_DISPLAY_TYPE_DSI:
  47                 if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
  48                         return 24;
  49                 else
  50                         return 16;
  51         case OMAP_DISPLAY_TYPE_VENC:
  52         case OMAP_DISPLAY_TYPE_SDI:
  53         case OMAP_DISPLAY_TYPE_HDMI:
  54         case OMAP_DISPLAY_TYPE_DVI:
  55                 return 24;
  56         default:
  57                 BUG();
  58                 return 0;
  59         }
  60 }
  61 EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);
  62
  63 void omapdss_default_get_timings(struct omap_dss_device *dssdev,
  64                 struct omap_video_timings *timings)
  65 {
  66         *timings = dssdev->panel.timings;
  67 }
  68 EXPORT_SYMBOL(omapdss_default_get_timings);
  69
  70 int dss_suspend_all_devices(void)
  71 {
  72         struct omap_dss_device *dssdev = NULL;
  73
  74         for_each_dss_dev(dssdev) {
  75                 if (!dssdev->driver)
  76                         continue;
  77
  78                 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
  79                         dssdev->driver->disable(dssdev);
  80                         dssdev->activate_after_resume = true;
  81                 } else {
  82                         dssdev->activate_after_resume = false;
  83                 }
  84         }
  85
  86         return 0;
  87 }
  88
  89 int dss_resume_all_devices(void)
  90 {
  91         struct omap_dss_device *dssdev = NULL;
  92
  93         for_each_dss_dev(dssdev) {
  94                 if (!dssdev->driver)
  95                         continue;
  96
  97                 if (dssdev->activate_after_resume) {
  98                         dssdev->driver->enable(dssdev);
  99                         dssdev->activate_after_resume = false;
 100                 }
 101         }
 102
 103         return 0;
 104 }
 105
 106 void dss_disable_all_devices(void)
 107 {
 108         struct omap_dss_device *dssdev = NULL;
 109
 110         for_each_dss_dev(dssdev) {
 111                 if (!dssdev->driver)
 112                         continue;
 113
 114                 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 115                         dssdev->driver->disable(dssdev);
 116         }
 117 }
 118
 119 static LIST_HEAD(panel_list);
 120 static DEFINE_MUTEX(panel_list_mutex);
 121 static int disp_num_counter;
 122
 123 int omapdss_register_display(struct omap_dss_device *dssdev)
 124 {
 125         struct omap_dss_driver *drv = dssdev->driver;
 126         int id;
 127
 128         /*
 129          * Note: this presumes all the displays are either using DT or non-DT,
 130          * which normally should be the case. This also presumes that all
 131          * displays either have an DT alias, or none has.
 132          */
 133
 134         if (dssdev->dev->of_node) {
 135                 id = of_alias_get_id(dssdev->dev->of_node, "display");
 136
 137                 if (id < 0)
 138                         id = disp_num_counter++;
 139         } else {
 140                 id = disp_num_counter++;
 141         }
 142
 143         snprintf(dssdev->alias, sizeof(dssdev->alias), "display%d", id);
 144
 145         /* Use 'label' property for name, if it exists */
 146         if (dssdev->dev->of_node)
 147                 of_property_read_string(dssdev->dev->of_node, "label",
 148                         &dssdev->name);
 149
 150         if (dssdev->name == NULL)
 151                 dssdev->name = dssdev->alias;
 152
 153         if (drv && drv->get_resolution == NULL)
 154                 drv->get_resolution = omapdss_default_get_resolution;
 155         if (drv && drv->get_recommended_bpp == NULL)
 156                 drv->get_recommended_bpp = omapdss_default_get_recommended_bpp;
 157         if (drv && drv->get_timings == NULL)
 158                 drv->get_timings = omapdss_default_get_timings;
 159
 160         mutex_lock(&panel_list_mutex);
 161         list_add_tail(&dssdev->panel_list, &panel_list);
 162         mutex_unlock(&panel_list_mutex);
 163         return 0;
 164 }
 165 EXPORT_SYMBOL(omapdss_register_display);
 166
 167 void omapdss_unregister_display(struct omap_dss_device *dssdev)
 168 {
 169         mutex_lock(&panel_list_mutex);
 170         list_del(&dssdev->panel_list);
 171         mutex_unlock(&panel_list_mutex);
 172 }
 173 EXPORT_SYMBOL(omapdss_unregister_display);
 174
 175 struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev)
 176 {
 177         if (!try_module_get(dssdev->owner))
 178                 return NULL;
 179
 180         if (get_device(dssdev->dev) == NULL) {
 181                 module_put(dssdev->owner);
 182                 return NULL;
 183         }
 184
 185         return dssdev;
 186 }
 187 EXPORT_SYMBOL(omap_dss_get_device);
 188
 189 void omap_dss_put_device(struct omap_dss_device *dssdev)
 190 {
 191         put_device(dssdev->dev);
 192         module_put(dssdev->owner);
 193 }
 194 EXPORT_SYMBOL(omap_dss_put_device);
 195
 196 /*
 197  * ref count of the found device is incremented.
 198  * ref count of from-device is decremented.
 199  */
 200 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
 201 {
 202         struct list_head *l;
 203         struct omap_dss_device *dssdev;
 204
 205         mutex_lock(&panel_list_mutex);
 206
 207         if (list_empty(&panel_list)) {
 208                 dssdev = NULL;
 209                 goto out;
 210         }
 211
 212         if (from == NULL) {
 213                 dssdev = list_first_entry(&panel_list, struct omap_dss_device,
 214                                 panel_list);
 215                 omap_dss_get_device(dssdev);
 216                 goto out;
 217         }
 218
 219         omap_dss_put_device(from);
 220
 221         list_for_each(l, &panel_list) {
 222                 dssdev = list_entry(l, struct omap_dss_device, panel_list);
 223                 if (dssdev == from) {
 224                         if (list_is_last(l, &panel_list)) {
 225                                 dssdev = NULL;
 226                                 goto out;
 227                         }
 228
 229                         dssdev = list_entry(l->next, struct omap_dss_device,
 230                                         panel_list);
 231                         omap_dss_get_device(dssdev);
 232                         goto out;
 233                 }
 234         }
 235
 236         WARN(1, "'from' dssdev not found\n");
 237
 238         dssdev = NULL;
 239 out:
 240         mutex_unlock(&panel_list_mutex);
 241         return dssdev;
 242 }
 243 EXPORT_SYMBOL(omap_dss_get_next_device);
 244
 245 struct omap_dss_device *omap_dss_find_device(void *data,
 246                 int (*match)(struct omap_dss_device *dssdev, void *data))
 247 {
 248         struct omap_dss_device *dssdev = NULL;
 249
 250         while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
 251                 if (match(dssdev, data))
 252                         return dssdev;
 253         }
 254
 255         return NULL;
 256 }
 257 EXPORT_SYMBOL(omap_dss_find_device);
 258
 259 void videomode_to_omap_video_timings(const struct videomode *vm,
 260                 struct omap_video_timings *ovt)
 261 {
 262         memset(ovt, 0, sizeof(*ovt));
 263
 264         ovt->pixelclock = vm->pixelclock;
 265         ovt->x_res = vm->hactive;
 266         ovt->hbp = vm->hback_porch;
 267         ovt->hfp = vm->hfront_porch;
 268         ovt->hsw = vm->hsync_len;
 269         ovt->y_res = vm->vactive;
 270         ovt->vbp = vm->vback_porch;
 271         ovt->vfp = vm->vfront_porch;
 272         ovt->vsw = vm->vsync_len;
 273
 274         ovt->vsync_level = vm->flags & DISPLAY_FLAGS_VSYNC_HIGH ?
 275                 OMAPDSS_SIG_ACTIVE_HIGH :
 276                 OMAPDSS_SIG_ACTIVE_LOW;
 277         ovt->hsync_level = vm->flags & DISPLAY_FLAGS_HSYNC_HIGH ?
 278                 OMAPDSS_SIG_ACTIVE_HIGH :
 279                 OMAPDSS_SIG_ACTIVE_LOW;
 280         ovt->de_level = vm->flags & DISPLAY_FLAGS_DE_HIGH ?
 281                 OMAPDSS_SIG_ACTIVE_HIGH :
 282                 OMAPDSS_SIG_ACTIVE_LOW;
 283         ovt->data_pclk_edge = vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ?
 284                 OMAPDSS_DRIVE_SIG_RISING_EDGE :
 285                 OMAPDSS_DRIVE_SIG_FALLING_EDGE;
 286
 287         ovt->sync_pclk_edge = ovt->data_pclk_edge;
 288 }
 289 EXPORT_SYMBOL(videomode_to_omap_video_timings);
 290
 291 void omap_video_timings_to_videomode(const struct omap_video_timings *ovt,
 292                 struct videomode *vm)
 293 {
 294         memset(vm, 0, sizeof(*vm));
 295
 296         vm->pixelclock = ovt->pixelclock;
 297
 298         vm->hactive = ovt->x_res;
 299         vm->hback_porch = ovt->hbp;
 300         vm->hfront_porch = ovt->hfp;
 301         vm->hsync_len = ovt->hsw;
 302         vm->vactive = ovt->y_res;
 303         vm->vback_porch = ovt->vbp;
 304         vm->vfront_porch = ovt->vfp;
 305         vm->vsync_len = ovt->vsw;
 306
 307         if (ovt->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 308                 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 309         else
 310                 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
 311
 312         if (ovt->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 313                 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
 314         else
 315                 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
 316
 317         if (ovt->de_level == OMAPDSS_SIG_ACTIVE_HIGH)
 318                 vm->flags |= DISPLAY_FLAGS_DE_HIGH;
 319         else
 320                 vm->flags |= DISPLAY_FLAGS_DE_LOW;
 321
 322         if (ovt->data_pclk_edge == OMAPDSS_DRIVE_SIG_RISING_EDGE)
 323                 vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
 324         else
 325                 vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
 326 }
 327 EXPORT_SYMBOL(omap_video_timings_to_videomode);