linux-kernel - Re: [PATCH v2 04/14] drm/msm/hdmi: set infoframes on all pre

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Date: Tue, 11 Jun 2024 17:04:51 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark
	<robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul
	<sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        "David
 Airlie" <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 04/14] drm/msm/hdmi: set infoframes on all pre_enable
 calls



On 5/22/2024 3:50 AM, Dmitry Baryshkov wrote:
> In consequent modeset calls, the atomic_pre_enable() will be called
> several times without calling atomic_post_disable() inbetween. Thus

Hi Dmitry,

Just wondering, where are you seeing multiple pre_enable() calls without 
a post_disable() happening?

IIRC, the msm commit_tail always calls commit_modeset_disables() before 
the commit_modeset_enables(). Also, doesn't the pre_enable() and 
post_disable() only happen once for bringing up/down the bridge?

Thanks,

Jessica Zhang

> iframes will not be updated for the next mode. Fix this by setting the
> iframe outside of the !power_on check.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> index 3c6121c57b01..fb99328107dd 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> @@ -133,10 +133,11 @@ static void msm_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
>   		msm_hdmi_phy_resource_enable(phy);
>   		msm_hdmi_power_on(bridge);
>   		hdmi->power_on = true;
> -		if (hdmi->hdmi_mode) {
> -			msm_hdmi_config_avi_infoframe(hdmi);
> -			msm_hdmi_audio_update(hdmi);
> -		}
> +	}
> +
> +	if (hdmi->hdmi_mode) {
> +		msm_hdmi_config_avi_infoframe(hdmi);
> +		msm_hdmi_audio_update(hdmi);
>   	}
>   
>   	msm_hdmi_phy_powerup(phy, hdmi->pixclock);
> 
> -- 
> 2.39.2
>