LXR linux/drivers/gpu/drm/rcar-du/rcar_du

   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
  25static 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
  34static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  35        .atomic_mode_set = rcar_du_encoder_mode_set,
  36};
  37
  38static const struct drm_encoder_funcs encoder_funcs = {
  39        .destroy = drm_encoder_cleanup,
  40};
  41
  42int 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
  86done:
  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}
  95