linux-kernel - Re: [PATCH v2] drm/msm/dp: enhance both connect and disconnect pending

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Message-ID: <CAE-0n51F+S4a2mQoyWa-TpJcd73hstm2Sh1uO+4T_75UaWQASQ@mail.gmail.com>
Date:   Wed, 20 Apr 2022 15:58:49 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc:     robdclark@...il.com, sean@...rly.run, vkoul@...nel.org,
        daniel@...ll.ch, airlied@...ux.ie, agross@...nel.org,
        bjorn.andersson@...aro.org, quic_abhinavk@...cinc.com,
        quic_aravindh@...cinc.com, quic_sbillaka@...cinc.com,
        freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/dp: enhance both connect and disconnect
 pending_timeout handle

Quoting Kuogee Hsieh (2022-04-15 17:06:48)
>
> On 4/14/2022 4:34 PM, Dmitry Baryshkov wrote:
> >
> > I'm not sure how should the driver react if the client doesn't disable
> > the output, but then the sink gets reattached?
>
> I do not know that either.
>
> But it should not happen as long as framework response to uevent.

In talking with seanpaul@ it sounds like we can update the link status
to BAD with drm_connector_set_link_status_property() and then put it
back to GOOD when the link is re-established. This way userspace will
know it needs to retry the modeset. Does that help here?