drivers/gpu/drm/arc/arcpgu_hdmi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ARC PGU DRM driver.
   4  *
   5  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   6  */
   7
   8 #include <drm/drm_bridge.h>
   9 #include <drm/drm_crtc.h>
  10 #include <drm/drm_encoder.h>
  11 #include <drm/drm_device.h>
  12
  13 #include "arcpgu.h"
  14
  15 static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
  16         .destroy = drm_encoder_cleanup,
  17 };
  18
  19 int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np)
  20 {
  21         struct drm_encoder *encoder;
  22         struct drm_bridge *bridge;
  23
  24         int ret = 0;
  25
  26         encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
  27         if (encoder == NULL)
  28                 return -ENOMEM;
  29
  30         /* Locate drm bridge from the hdmi encoder DT node */
  31         bridge = of_drm_find_bridge(np);
  32         if (!bridge)
  33                 return -EPROBE_DEFER;
  34
  35         encoder->possible_crtcs = 1;
  36         encoder->possible_clones = 0;
  37         ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
  38                                DRM_MODE_ENCODER_TMDS, NULL);
  39         if (ret)
  40                 return ret;
  41
  42         /* Link drm_bridge to encoder */
  43         ret = drm_bridge_attach(encoder, bridge, NULL, 0);
  44         if (ret)
  45                 drm_encoder_cleanup(encoder);
  46
  47         return ret;
  48 }