mirror of https://gitee.com/openkylin/linux.git
131 lines
2.9 KiB
C
131 lines
2.9 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_bridge.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 <drm/drm_simple_kms_helper.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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#include "rcar_lvds.h"
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/* -----------------------------------------------------------------------------
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* Encoder
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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_typed(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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/*
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* On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a
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* companion for LVDS0 in dual-link mode.
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*/
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if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
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if (rcar_lvds_dual_link(bridge)) {
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ret = -ENOLINK;
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goto done;
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}
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}
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ret = drm_simple_encoder_init(rcdu->ddev, encoder,
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DRM_MODE_ENCODER_NONE);
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if (ret < 0)
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goto done;
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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, 0);
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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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