drivers/gpu/drm/omapdrm/dss/display.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2009 Nokia Corporation
   4  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   5  *
   6  * Some code and ideas taken from drivers/video/omap/ driver
   7  * by Imre Deak.
   8  */
   9
  10 #define DSS_SUBSYS_NAME "DISPLAY"
  11
  12 #include <linux/kernel.h>
  13 #include <linux/of.h>
  14
  15 #include <drm/drm_connector.h>
  16 #include <drm/drm_modes.h>
  17
  18 #include "omapdss.h"
  19
  20 static int disp_num_counter;
  21
  22 void omapdss_display_init(struct omap_dss_device *dssdev)
  23 {
  24         int id;
  25
  26         /*
  27          * Note: this presumes that all displays either have an DT alias, or
  28          * none has.
  29          */
  30         id = of_alias_get_id(dssdev->dev->of_node, "display");
  31         if (id < 0)
  32                 id = disp_num_counter++;
  33
  34         /* Use 'label' property for name, if it exists */
  35         of_property_read_string(dssdev->dev->of_node, "label", &dssdev->name);
  36
  37         if (dssdev->name == NULL)
  38                 dssdev->name = devm_kasprintf(dssdev->dev, GFP_KERNEL,
  39                                               "display%u", id);
  40 }
  41 EXPORT_SYMBOL_GPL(omapdss_display_init);
  42
  43 int omapdss_display_get_modes(struct drm_connector *connector,
  44                               const struct videomode *vm)
  45 {
  46         struct drm_display_mode *mode;
  47
  48         mode = drm_mode_create(connector->dev);
  49         if (!mode)
  50                 return 0;
  51
  52         drm_display_mode_from_videomode(vm, mode);
  53
  54         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  55         drm_mode_set_name(mode);
  56         drm_mode_probed_add(connector, mode);
  57
  58         return 1;
  59 }
  60 EXPORT_SYMBOL_GPL(omapdss_display_get_modes);