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13dfc0540a
Many DRM drivers have common code to make a stub connector
implementation that wraps a drm_panel. By wrapping the panel in a DRM
bridge, all of the connector code (including calls during encoder
enable/disable) goes away.
v2: Fix build with CONFIG_DRM=m, drop "dev" argument that should just
be the panel's dev, move kerneldoc up a level and document
_remove().
v3: Fix another breakage with CONFIG_DRM=m, fix breakage with
CONFIG_OF=n, move protos under CONFIG_DRM_PANEL_BRIDGE, wrap a
line.
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v1)
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> (v2)
Acked-by: Archit Taneja <architt@codeaurora.org> (v2)
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170602202514.11900-1-eric@anholt.net
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_panel.h>
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#include <linux/of_graph.h>
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static int lvds_encoder_probe(struct platform_device *pdev)
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{
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struct device_node *port;
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struct device_node *endpoint;
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struct device_node *panel_node;
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struct drm_panel *panel;
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struct drm_bridge *bridge;
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/* Locate the panel DT node. */
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port = of_graph_get_port_by_id(pdev->dev.of_node, 1);
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if (!port) {
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dev_dbg(&pdev->dev, "port 1 not found\n");
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return -ENXIO;
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}
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endpoint = of_get_child_by_name(port, "endpoint");
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of_node_put(port);
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if (!endpoint) {
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dev_dbg(&pdev->dev, "no endpoint for port 1\n");
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return -ENXIO;
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}
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panel_node = of_graph_get_remote_port_parent(endpoint);
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of_node_put(endpoint);
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if (!panel_node) {
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dev_dbg(&pdev->dev, "no remote endpoint for port 1\n");
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return -ENXIO;
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}
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panel = of_drm_find_panel(panel_node);
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of_node_put(panel_node);
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if (!panel) {
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dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
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return -EPROBE_DEFER;
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}
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bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS);
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if (IS_ERR(bridge))
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return PTR_ERR(bridge);
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platform_set_drvdata(pdev, bridge);
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return 0;
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}
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static int lvds_encoder_remove(struct platform_device *pdev)
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{
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struct drm_bridge *bridge = platform_get_drvdata(pdev);
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drm_bridge_remove(bridge);
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return 0;
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}
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static const struct of_device_id lvds_encoder_match[] = {
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{ .compatible = "lvds-encoder" },
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{ .compatible = "thine,thc63lvdm83d" },
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{},
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};
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MODULE_DEVICE_TABLE(of, lvds_encoder_match);
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static struct platform_driver lvds_encoder_driver = {
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.probe = lvds_encoder_probe,
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.remove = lvds_encoder_remove,
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.driver = {
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.name = "lvds-encoder",
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.of_match_table = lvds_encoder_match,
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},
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};
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module_platform_driver(lvds_encoder_driver);
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MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
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MODULE_DESCRIPTION("Transparent parallel to LVDS encoder");
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MODULE_LICENSE("GPL");
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