LXR linux/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
  20static int disp_num_counter;
  21
  22void 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}
  41EXPORT_SYMBOL_GPL(omapdss_display_init);
  42
  43struct omap_dss_device *omapdss_display_get(struct omap_dss_device *output)
  44{
  45        while (output->next)
  46                output = output->next;
  47
  48        return omapdss_device_get(output);
  49}
  50EXPORT_SYMBOL_GPL(omapdss_display_get);
  51
  52int omapdss_display_get_modes(struct drm_connector *connector,
  53                              const struct videomode *vm)
  54{
  55        struct drm_display_mode *mode;
  56
  57        mode = drm_mode_create(connector->dev);
  58        if (!mode)
  59                return 0;
  60
  61        drm_display_mode_from_videomode(vm, mode);
  62
  63        mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  64        drm_mode_set_name(mode);
  65        drm_mode_probed_add(connector, mode);
  66
  67        return 1;
  68}
  69EXPORT_SYMBOL_GPL(omapdss_display_get_modes);
  70