[Letux-kernel] [PATCH v4 05/10] drm/bridge: synopsis: Fix to properly handle HPD

Maxime Ripard maxime at cerno.tech
Mon Sep 27 19:00:34 CEST 2021


Hi,

On Mon, Sep 27, 2021 at 06:44:23PM +0200, H. Nikolaus Schaller wrote:
> It appears that dw-hdmi plugin detection is not properly
> propagated unless we call drm_kms_helper_hotplug_event().
> 
> Maybe drm_bridge_hpd_notify should have been setup to
> call this.
> 
> Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index f082e14320e1..edea04f80576 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -3018,6 +3018,8 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
>  		if (hdmi->bridge.dev) {
>  			drm_helper_hpd_irq_event(hdmi->bridge.dev);
>  			drm_bridge_hpd_notify(&hdmi->bridge, status);
> +
> +			drm_kms_helper_hotplug_event(hdmi->bridge.dev);

drm_kms_helper_hotplug_event is already called from drm_helper_hpd_irq_event

Maxime
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