Hi,
On Tue, 14 Nov 2017 11:16:47 -0800 Eric Anholt wrote:
> 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 <e...@anholt.net>
> Fixes: 13dfc0540a57 ("drm/bridge: Refactor out the panel wrapper from the
> lvds-encoder bri
> dge.")
> ---
>
> Note: I haven't actually tested this patch! Hope it helps, though.
>
> drivers/gpu/drm/bridge/lvds-encoder.c | 48
> ++++++++++++++++++++++++++++++-----
> 1 file changed, 41 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c
> b/drivers/gpu/drm/bridge/lvds-encoder.c
> index 0903ba574f61..75b0d3f6e4de 100644
> --- a/drivers/gpu/drm/bridge/lvds-encoder.c
> +++ b/drivers/gpu/drm/bridge/lvds-encoder.c
> @@ -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);
> +
> + /* 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, 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;
> }
>
Tested-by: Lothar Waßmann <l...@karo-electronics.de>
Lothar Waßmann
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