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drm/bridge: Fix lvds-encoder since the panel_bridge rework.

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The panel_bridge bridge attaches to the panel's OF node, not the
lvds-encoder's node.  Put in a little no-op bridge of our own so that
our consumers can still find a bridge where they expect.

This also fixes an unintended unregistration and leak of the
panel-bridge on module remove.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: 13dfc0540a ("drm/bridge: Refactor out the panel wrapper from the lvds-encoder bri
dge.")
Tested-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114191647.22207-1-eric@anholt.net
This commit is contained in:
Eric Anholt 2017-11-14 11:16:47 -08:00 committed by Archit Taneja
parent ebe32c3e28
commit dbb58bfd9a
1 changed files with 41 additions and 7 deletions
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48
drivers/gpu/drm/bridge/lvds-encoder.c
View File

@ -13,13 +13,37 @@
#include <linux/of_graph.h>
struct lvds_encoder {
struct drm_bridge bridge;
struct drm_bridge *panel_bridge;
};
static int lvds_encoder_attach(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds_encoder = container_of(bridge,
struct lvds_encoder,
bridge);
return drm_bridge_attach(bridge->encoder, lvds_encoder->panel_bridge,
bridge);
}
static struct drm_bridge_funcs funcs = {
.attach = lvds_encoder_attach,
};
static int lvds_encoder_probe(struct platform_device *pdev)
{
struct device_node *port;
struct device_node *endpoint;
struct device_node *panel_node;
struct drm_panel *panel;
struct drm_bridge *bridge;
struct lvds_encoder *lvds_encoder;
lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder),
GFP_KERNEL);
if (!lvds_encoder)
return -ENOMEM;
/* Locate the panel DT node. */
port = of_graph_get_port_by_id(pdev->dev.of_node, 1);
@ -49,20 +73,30 @@ static int lvds_encoder_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
}
bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS);
if (IS_ERR(bridge))
return PTR_ERR(bridge);
lvds_encoder->panel_bridge =
devm_drm_panel_bridge_add(&pdev->dev,
panel, DRM_MODE_CONNECTOR_LVDS);
if (IS_ERR(lvds_encoder->panel_bridge))
return PTR_ERR(lvds_encoder->panel_bridge);
platform_set_drvdata(pdev, bridge);
/* The panel_bridge bridge is attached to the panel's of_node,
* but we need a bridge attached to our of_node for our user
* to look up.
*/
lvds_encoder->bridge.of_node = pdev->dev.of_node;
lvds_encoder->bridge.funcs = &funcs;
drm_bridge_add(&lvds_encoder->bridge);
platform_set_drvdata(pdev, lvds_encoder);
return 0;
}
static int lvds_encoder_remove(struct platform_device *pdev)
{
struct drm_bridge *bridge = platform_get_drvdata(pdev);
struct lvds_encoder *lvds_encoder = platform_get_drvdata(pdev);
drm_bridge_remove(bridge);
drm_bridge_remove(&lvds_encoder->bridge);
return 0;
}