drivers/gpu/drm/arc/arcpgu_hdmi.c

   1 /*
   2  * ARC PGU DRM driver.
   3  *
   4  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_encoder_slave.h>
  19
  20 #include "arcpgu.h"
  21
  22 static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
  23         .destroy = drm_encoder_cleanup,
  24 };
  25
  26 int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np)
  27 {
  28         struct drm_encoder *encoder;
  29         struct drm_bridge *bridge;
  30
  31         int ret = 0;
  32
  33         encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
  34         if (encoder == NULL)
  35                 return -ENOMEM;
  36
  37         /* Locate drm bridge from the hdmi encoder DT node */
  38         bridge = of_drm_find_bridge(np);
  39         if (!bridge)
  40                 return -EPROBE_DEFER;
  41
  42         encoder->possible_crtcs = 1;
  43         encoder->possible_clones = 0;
  44         ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
  45                                DRM_MODE_ENCODER_TMDS, NULL);
  46         if (ret)
  47                 return ret;
  48
  49         /* Link drm_bridge to encoder */
  50         ret = drm_bridge_attach(encoder, bridge, NULL);
  51         if (ret)
  52                 drm_encoder_cleanup(encoder);
  53
  54         return ret;
  55 }