138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* 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 <linux/of.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_bridge_connector.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_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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static const struct drm_encoder_funcs rcar_du_encoder_funcs = {
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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_connector *connector;
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struct drm_bridge *bridge;
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int ret;
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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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return PTR_ERR(panel);
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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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return PTR_ERR(bridge);
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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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return -EPROBE_DEFER;
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if (output == RCAR_DU_OUTPUT_LVDS0 ||
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output == RCAR_DU_OUTPUT_LVDS1)
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rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
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if (output == RCAR_DU_OUTPUT_DSI0 ||
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output == RCAR_DU_OUTPUT_DSI1)
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rcdu->dsi[output - RCAR_DU_OUTPUT_DSI0] = bridge;
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}
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/*
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* Create and initialize the encoder. On Gen3, skip the LVDS1 output if
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* the LVDS1 encoder is used as a companion for LVDS0 in dual-link
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* mode, or any LVDS output if it isn't connected. The latter may happen
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* on D3 or E3 as the LVDS encoders are needed to provide the pixel
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* clock to the DU, even when the LVDS outputs are not used.
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*/
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if (rcdu->info->gen >= 3) {
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if (output == RCAR_DU_OUTPUT_LVDS1 &&
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rcar_lvds_dual_link(bridge))
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return -ENOLINK;
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if ((output == RCAR_DU_OUTPUT_LVDS0 ||
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output == RCAR_DU_OUTPUT_LVDS1) &&
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!rcar_lvds_is_connected(bridge))
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return -ENOLINK;
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}
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dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n",
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enc_node, rcar_du_output_name(output));
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renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base,
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&rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE,
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NULL);
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if (!renc)
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return -ENOMEM;
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renc->output = output;
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/* Attach the bridge to the encoder. */
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ret = drm_bridge_attach(&renc->base, bridge, NULL,
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DRM_BRIDGE_ATTACH_NO_CONNECTOR);
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if (ret) {
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dev_err(rcdu->dev,
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"failed to attach bridge %pOF for output %s (%d)\n",
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bridge->of_node, rcar_du_output_name(output), ret);
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return ret;
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}
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/* Create the connector for the chain of bridges. */
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connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base);
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if (IS_ERR(connector)) {
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dev_err(rcdu->dev,
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"failed to created connector for output %s (%ld)\n",
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rcar_du_output_name(output), PTR_ERR(connector));
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return PTR_ERR(connector);
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}
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return drm_connector_attach_encoder(connector, &renc->base);
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}
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