linux-kernel - Re: [PATCH v2 05/12] drm/msm/dp: Drop EV_USER

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Message-ID: <ykbudesvb2ya2gbtgbyrcn5niesul2bnpfsrl2hourpw56zwdn@y7kmcd2ejwxz>
Date: Sat, 9 Aug 2025 05:14:48 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Jessica Zhang <jessica.zhang@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Dmitry Baryshkov <lumag@...nel.org>, 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>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Yongxing Mou <quic_yongmou@...cinc.com>
Subject: Re: [PATCH v2 05/12] drm/msm/dp: Drop EV_USER_NOTIFICATION

On Fri, Aug 08, 2025 at 05:35:17PM -0700, Jessica Zhang wrote:
> 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.
> 
> Signed-off-by: Jessica Zhang <jessica.zhang@....qualcomm.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 

This removes serialisation around
msm_dp_display_send_hpd_notification(). This means that it can be called
this function can be called in parallel, so we need to add locking
around .link_ready access.

-- 
With best wishes
Dmitry