linux-kernel - Re: [PATCH v3 5/8] drm/msm/dp: Drop EV_USER

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Message-ID: <d98339f8-7296-4daa-b625-0908ecd3e65c@oss.qualcomm.com>
Date: Thu, 15 Jan 2026 11:12:03 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov
 <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jessica Zhang <jessica.zhang@....qualcomm.com>
Subject: Re: [PATCH v3 5/8] drm/msm/dp: Drop EV_USER_NOTIFICATION

On 1/15/26 10:42 AM, Dmitry Baryshkov wrote:
> 
> 
> On 15/01/2026 11:41, Konrad Dybcio wrote:
>> On 1/15/26 8:29 AM, Dmitry Baryshkov wrote:
>>> From: Jessica Zhang <jessica.zhang@....qualcomm.com>
>>>
>>> Currently, we queue an event for signalling HPD connect/disconnect. This
>>> can mean a delay in plug/unplug handling and notifying DRM core when a
>>> hotplug happens.
>>>
>>> Drop EV_USER_NOTIFICATION and signal the IRQ event as part of hotplug
>>> handling.
>>
>> IIUC, the drm_helper_hpd_irq_event() -> drm_bridge_hpd_notify() change
>> also prevents us from checking *all* connectors if we get *any* HPD?
> 
> _unnecessarily_ checking all connectors if we know that HPD was here.

Yeah that's what I had in mind

Acked-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad