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

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * rcar_du_encoder.c  --  R-Car Display Unit Encoder
   4  *
   5  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   6  *
   7  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8  */
   9
  10 #include <linux/export.h>
  11
  12 #include <drm/drmP.h>
  13 #include <drm/drm_crtc.h>
  14 #include <drm/drm_crtc_helper.h>
  15 #include <drm/drm_panel.h>
  16
  17 #include "rcar_du_drv.h"
  18 #include "rcar_du_encoder.h"
  19 #include "rcar_du_kms.h"
  20
  21 /* -----------------------------------------------------------------------------
  22  * Encoder
  23  */
  24
  25 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
  26                                      struct drm_crtc_state *crtc_state,
  27                                      struct drm_connector_state *conn_state)
  28 {
  29         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  30
  31         rcar_du_crtc_route_output(crtc_state->crtc, renc->output);
  32 }
  33
  34 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  35         .atomic_mode_set = rcar_du_encoder_mode_set,
  36 };
  37
  38 static const struct drm_encoder_funcs encoder_funcs = {
  39         .destroy = drm_encoder_cleanup,
  40 };
  41
  42 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
  43                          enum rcar_du_output output,
  44                          struct device_node *enc_node,
  45                          struct device_node *con_node)
  46 {
  47         struct rcar_du_encoder *renc;
  48         struct drm_encoder *encoder;
  49         struct drm_bridge *bridge = NULL;
  50         int ret;
  51
  52         renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
  53         if (renc == NULL)
  54                 return -ENOMEM;
  55
  56         renc->output = output;
  57         encoder = rcar_encoder_to_drm_encoder(renc);
  58
  59         dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
  60                 enc_node, output);
  61
  62         /* Locate the DRM bridge from the encoder DT node. */
  63         bridge = of_drm_find_bridge(enc_node);
  64         if (!bridge) {
  65                 ret = -EPROBE_DEFER;
  66                 goto done;
  67         }
  68
  69         ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
  70                                DRM_MODE_ENCODER_NONE, NULL);
  71         if (ret < 0)
  72                 goto done;
  73
  74         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
  75
  76         /*
  77          * Attach the bridge to the encoder. The bridge will create the
  78          * connector.
  79          */
  80         ret = drm_bridge_attach(encoder, bridge, NULL);
  81         if (ret) {
  82                 drm_encoder_cleanup(encoder);
  83                 return ret;
  84         }
  85
  86 done:
  87         if (ret < 0) {
  88                 if (encoder->name)
  89                         encoder->funcs->destroy(encoder);
  90                 devm_kfree(rcdu->dev, renc);
  91         }
  92
  93         return ret;
  94 }