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SubjectRe: [PATCH] drm/bridge: Fix lvds-encoder since the panel_bridge rework.
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On 11/15/2017 03:29 PM, Lothar Waßmann wrote:
> 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 <eric@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 <LW@KARO-electronics.de>

queued to drm-misc-fixes.

I think we should send this patch for the stable kernels (v4.12+) too.

Thanks,
Archit

>
>
> Lothar Waßmann
>

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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