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From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date:   Mon, 27 Mar 2023 01:02:28 +0300
Message-ID: <CAA8EJpp+gX+6zniMioBfXC95VF2qVTPidQB36zyrohhrGerK8g@mail.gmail.com>
Subject: Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support
To:     Bjorn Andersson <andersson@kernel.org>
Cc:     Vinod Polimera <quic_vpolimer@quicinc.com>,
        dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        freedreno@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, robdclark@gmail.com,
        dianders@chromium.org, swboyd@chromium.org,
        quic_kalyant@quicinc.com, quic_khsieh@quicinc.com,
        quic_vproddut@quicinc.com, quic_bjorande@quicinc.com,
        quic_abhinavk@quicinc.com, quic_sbillaka@quicinc.com
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On Sun, 26 Mar 2023 at 19:24, Bjorn Andersson <andersson@kernel.org> wrote:
>
> On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > For the PSR to kick in, self_refresh_aware has to be set.
> > Initialize it based on the PSR support for the eDP interface.
> >
>
> When I boot my sc8280xp devices (CRD and X13s) to console with this
> patch included I get a login prompt, and then there are no more screen
> updates.
>
> Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
>
> Blindly login in and launching Wayland works and from then on screen
> updates works as expected.
>
> Switching from Wayland to another virtual terminal causes the problem to
> re-appear, no updates after the initial refresh, switching back go the
> Wayland-terminal crashed the machine.
>
>
>
> Reverting this single patch resolves both the issue with the console
> updating as exected and flipping between the virtual terminal with
> Wayland and the others no longer crashes my machine.

I hope Vinod Polimera can assist in solving the issue. In the worst
case we will have to revert this commit, shortcutting the PSR until it
is properly debugged.

>
> Regards,
> Bjorn
>
> > Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> > ---
> >  drivers/gpu/drm/msm/dp/dp_drm.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> > index 029e08c..785d766 100644
> > --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> > +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> > @@ -117,6 +117,8 @@ static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
> >       if (WARN_ON(!conn_state))
> >               return -ENODEV;
> >
> > +     conn_state->self_refresh_aware = dp->psr_supported;
> > +
> >       if (!conn_state->crtc || !crtc_state)
> >               return 0;
> >
> > --
> > 2.7.4
> >


-- 
With best wishes
Dmitry