drivers/gpu/drm/rcar-du/rcar_du_encoder.c

   1 /*
   2  * rcar_du_encoder.c  --  R-Car Display Unit Encoder
   3  *
   4  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/export.h>
  15
  16 #include <drm/drmP.h>
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_panel.h>
  20
  21 #include "rcar_du_drv.h"
  22 #include "rcar_du_encoder.h"
  23 #include "rcar_du_kms.h"
  24
  25 /* -----------------------------------------------------------------------------
  26  * Encoder
  27  */
  28
  29 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
  30                                      struct drm_crtc_state *crtc_state,
  31                                      struct drm_connector_state *conn_state)
  32 {
  33         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  34
  35         rcar_du_crtc_route_output(crtc_state->crtc, renc->output);
  36 }
  37
  38 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  39         .atomic_mode_set = rcar_du_encoder_mode_set,
  40 };
  41
  42 static const struct drm_encoder_funcs encoder_funcs = {
  43         .destroy = drm_encoder_cleanup,
  44 };
  45
  46 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
  47                          enum rcar_du_output output,
  48                          struct device_node *enc_node,
  49                          struct device_node *con_node)
  50 {
  51         struct rcar_du_encoder *renc;
  52         struct drm_encoder *encoder;
  53         struct drm_bridge *bridge = NULL;
  54         int ret;
  55
  56         renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
  57         if (renc == NULL)
  58                 return -ENOMEM;
  59
  60         renc->output = output;
  61         encoder = rcar_encoder_to_drm_encoder(renc);
  62
  63         dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
  64                 enc_node, output);
  65
  66         /* Locate the DRM bridge from the encoder DT node. */
  67         bridge = of_drm_find_bridge(enc_node);
  68         if (!bridge) {
  69                 ret = -EPROBE_DEFER;
  70                 goto done;
  71         }
  72
  73         ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
  74                                DRM_MODE_ENCODER_NONE, NULL);
  75         if (ret < 0)
  76                 goto done;
  77
  78         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
  79
  80         /*
  81          * Attach the bridge to the encoder. The bridge will create the
  82          * connector.
  83          */
  84         ret = drm_bridge_attach(encoder, bridge, NULL);
  85         if (ret) {
  86                 drm_encoder_cleanup(encoder);
  87                 return ret;
  88         }
  89
  90 done:
  91         if (ret < 0) {
  92                 if (encoder->name)
  93                         encoder->funcs->destroy(encoder);
  94                 devm_kfree(rcdu->dev, renc);
  95         }
  96
  97         return ret;
  98 }