73eb5476df
The R-Car DU driver assumes that a bridge is always connected to the DU output. This is valid for the LVDS and HDMI outputs, but the DPAD outputs can be connected directly to a panel, in which case no bridge is available. To support this use case, detect whether the entities connected to the DU DPAD outputs are encoders or panels based on the number of ports of their DT node, and retrieve the corresponding type of DRM objects. For panels, additionally create panel bridge instances. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Tested-by: Kevin Key <kevin.key@gentex.com> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* rcar_du_encoder.c -- R-Car Display Unit Encoder
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*
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* Copyright (C) 2013-2014 Renesas Electronics Corporation
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*
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* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/export.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#include <drm/drm_panel.h>
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#include "rcar_du_drv.h"
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#include "rcar_du_encoder.h"
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#include "rcar_du_kms.h"
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/* -----------------------------------------------------------------------------
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* Encoder
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*/
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static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
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};
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static const struct drm_encoder_funcs encoder_funcs = {
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.destroy = drm_encoder_cleanup,
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};
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static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
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{
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struct device_node *ports;
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struct device_node *port;
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unsigned int num_ports = 0;
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ports = of_get_child_by_name(node, "ports");
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if (!ports)
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ports = of_node_get(node);
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for_each_child_of_node(ports, port) {
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if (of_node_name_eq(port, "port"))
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num_ports++;
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}
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of_node_put(ports);
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return num_ports;
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}
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int rcar_du_encoder_init(struct rcar_du_device *rcdu,
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enum rcar_du_output output,
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struct device_node *enc_node)
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{
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struct rcar_du_encoder *renc;
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struct drm_encoder *encoder;
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struct drm_bridge *bridge;
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int ret;
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renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
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if (renc == NULL)
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return -ENOMEM;
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rcdu->encoders[output] = renc;
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renc->output = output;
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encoder = rcar_encoder_to_drm_encoder(renc);
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dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
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enc_node, output);
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/*
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* Locate the DRM bridge from the DT node. For the DPAD outputs, if the
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* DT node has a single port, assume that it describes a panel and
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* create a panel bridge.
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*/
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if ((output == RCAR_DU_OUTPUT_DPAD0 ||
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output == RCAR_DU_OUTPUT_DPAD1) &&
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rcar_du_encoder_count_ports(enc_node) == 1) {
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struct drm_panel *panel = of_drm_find_panel(enc_node);
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if (IS_ERR(panel)) {
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ret = PTR_ERR(panel);
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goto done;
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}
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bridge = devm_drm_panel_bridge_add(rcdu->dev, panel,
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DRM_MODE_CONNECTOR_DPI);
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if (IS_ERR(bridge)) {
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ret = PTR_ERR(bridge);
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goto done;
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}
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} else {
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bridge = of_drm_find_bridge(enc_node);
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if (!bridge) {
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ret = -EPROBE_DEFER;
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goto done;
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}
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}
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ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
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DRM_MODE_ENCODER_NONE, NULL);
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if (ret < 0)
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goto done;
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drm_encoder_helper_add(encoder, &encoder_helper_funcs);
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/*
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* Attach the bridge to the encoder. The bridge will create the
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* connector.
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*/
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ret = drm_bridge_attach(encoder, bridge, NULL);
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if (ret) {
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drm_encoder_cleanup(encoder);
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return ret;
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}
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done:
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if (ret < 0) {
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if (encoder->name)
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encoder->funcs->destroy(encoder);
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devm_kfree(rcdu->dev, renc);
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}
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return ret;
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}
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