blob: 4bf4e25d7f011fdacb1eabb1662f2e9fedf9d448 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
* rcar_du_encoder.c -- R-Car Display Unit Encoder
* Copyright (C) 2013-2014 Renesas Electronics Corporation
* Contact: Laurent Pinchart (
#include <linux/export.h>
#include <linux/slab.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_crtc.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_panel.h>
#include "rcar_du_drv.h"
#include "rcar_du_encoder.h"
#include "rcar_du_kms.h"
#include "rcar_lvds.h"
/* -----------------------------------------------------------------------------
* Encoder
static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
struct device_node *ports;
struct device_node *port;
unsigned int num_ports = 0;
ports = of_get_child_by_name(node, "ports");
if (!ports)
ports = of_node_get(node);
for_each_child_of_node(ports, port) {
if (of_node_name_eq(port, "port"))
return num_ports;
static const struct drm_encoder_funcs rcar_du_encoder_funcs = {
int rcar_du_encoder_init(struct rcar_du_device *rcdu,
enum rcar_du_output output,
struct device_node *enc_node)
struct rcar_du_encoder *renc;
struct drm_connector *connector;
struct drm_bridge *bridge;
int ret;
* Locate the DRM bridge from the DT node. For the DPAD outputs, if the
* DT node has a single port, assume that it describes a panel and
* create a panel bridge.
if ((output == RCAR_DU_OUTPUT_DPAD0 ||
output == RCAR_DU_OUTPUT_DPAD1) &&
rcar_du_encoder_count_ports(enc_node) == 1) {
struct drm_panel *panel = of_drm_find_panel(enc_node);
if (IS_ERR(panel))
return PTR_ERR(panel);
bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
if (IS_ERR(bridge))
return PTR_ERR(bridge);
} else {
bridge = of_drm_find_bridge(enc_node);
if (!bridge)
if (output == RCAR_DU_OUTPUT_LVDS0 ||
rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
* Create and initialize the encoder. On Gen3, skip the LVDS1 output if
* the LVDS1 encoder is used as a companion for LVDS0 in dual-link
* mode, or any LVDS output if it isn't connected. The latter may happen
* on D3 or E3 as the LVDS encoders are needed to provide the pixel
* clock to the DU, even when the LVDS outputs are not used.
if (rcdu->info->gen >= 3) {
if (output == RCAR_DU_OUTPUT_LVDS1 &&
return -ENOLINK;
if ((output == RCAR_DU_OUTPUT_LVDS0 ||
output == RCAR_DU_OUTPUT_LVDS1) &&
return -ENOLINK;
dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
enc_node, output);
renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base,
&rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE,
if (!renc)
return -ENOMEM;
renc->output = output;
/* Attach the bridge to the encoder. */
ret = drm_bridge_attach(&renc->base, bridge, NULL,
if (ret) {
dev_err(rcdu->dev, "failed to attach bridge for output %u\n",
return ret;
/* Create the connector for the chain of bridges. */
connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base);
if (IS_ERR(connector)) {
"failed to created connector for output %u\n", output);
return PTR_ERR(connector);
return drm_connector_attach_encoder(connector, &renc->base);