linux-kernel - Re: [PATCH v1] drm/msm/dp: use dp_hpd_plug_handle() and dp_hpd_unplug

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Message-ID: <CAE-0n503FwcwreZ14MMKgdzu8QybWYtMdLOKasiCwmE8pCJOSw@mail.gmail.com>
Date: Thu, 28 Mar 2024 15:58:17 -0500
From: Stephen Boyd <swboyd@...omium.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>, Bjorn Andersson <andersson@...nel.org>, 
	Johan Hovold <johan@...nel.org>, Kuogee Hsieh <quic_khsieh@...cinc.com>, abel.vesa@...aro.org, 
	agross@...nel.org, airlied@...il.com, daniel@...ll.ch, dianders@...omium.org, 
	dmitry.baryshkov@...aro.org, dri-devel@...ts.freedesktop.org, 
	robdclark@...il.com, sean@...rly.run, vkoul@...nel.org
Cc: quic_jesszhan@...cinc.com, quic_sbillaka@...cinc.com, 
	marijn.suijten@...ainline.org, freedreno@...ts.freedesktop.org, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] drm/msm/dp: use dp_hpd_plug_handle() and
 dp_hpd_unplug_handle() directly

Quoting Abhinav Kumar (2024-03-28 13:24:34)
> + Johan and Bjorn for FYI
>
> On 3/28/2024 1:04 PM, Kuogee Hsieh wrote:
> > For internal HPD case, hpd_event_thread is created to handle HPD
> > interrupts generated by HPD block of DP controller. It converts
> > HPD interrupts into events and executed them under hpd_event_thread
> > context. For external HPD case, HPD events is delivered by way of
> > dp_bridge_hpd_notify() under thread context. Since they are executed
> > under thread context already, there is no reason to hand over those
> > events to hpd_event_thread. Hence dp_hpd_plug_handle() and
> > dp_hpd_unplug_hanlde() are called directly at dp_bridge_hpd_notify().
> >
> > Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> > ---
> >   drivers/gpu/drm/msm/dp/dp_display.c | 5 +++--
> >   1 file changed, 3 insertions(+), 2 deletions(-)
> >
>
> Fixes: 542b37efc20e ("drm/msm/dp: Implement hpd_notify()")

Is this a bug fix or an optimization? The commit text doesn't tell me.

>
> Looks right to me,
>
> Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>