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// 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 (laurent.pinchart@ideasonboard.com)
*/
#include <linux/export.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_panel.h>
#include <drm/drm_simple_kms_helper.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"))
num_ports++;
}
of_node_put(ports);
return num_ports;
}
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_encoder *encoder;
struct drm_bridge *bridge;
int ret;
renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
if (renc == NULL)
return -ENOMEM;
rcdu->encoders[output] = renc;
renc->output = output;
encoder = rcar_encoder_to_drm_encoder(renc);
dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
enc_node, output);
/*
* 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)) {
ret = PTR_ERR(panel);
goto done;
}
bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
DRM_MODE_CONNECTOR_DPI);
if (IS_ERR(bridge)) {
ret = PTR_ERR(bridge);
goto done;
}
} else {
bridge = of_drm_find_bridge(enc_node);
if (!bridge) {
ret = -EPROBE_DEFER;
goto done;
}
}
/*
* On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a
* companion for LVDS0 in dual-link mode.
*/
if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
if (rcar_lvds_dual_link(bridge)) {
ret = -ENOLINK;
goto done;
}
}
ret = drm_simple_encoder_init(rcdu->ddev, encoder,
DRM_MODE_ENCODER_NONE);
if (ret < 0)
goto done;
/*
* Attach the bridge to the encoder. The bridge will create the
* connector.
*/
ret = drm_bridge_attach(encoder, bridge, NULL, 0);
if (ret) {
drm_encoder_cleanup(encoder);
return ret;
}
done:
if (ret < 0) {
if (encoder->name)
encoder->funcs->destroy(encoder);
devm_kfree(rcdu->dev, renc);
}
return ret;
}
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