linux-kernel - Re: [v2] drm/msm: add shutdown support for display platform

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Message-ID: <CAF6AEGvDN2B-xxecOt+0aaweWohGSKekb3tCerX42T1eOte-ig@mail.gmail.com>
Date:   Tue, 18 Aug 2020 08:12:53 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc:     Krishna Manikandan <mkrishn@...eaurora.org>,
        Emil Velikov <emil.velikov@...labora.com>,
        Sean Paul <seanpaul@...omium.org>,
        "Kristian H. Kristensen" <hoegsberg@...omium.org>,
        Kalyan Thota <kalyan_t@...eaurora.org>, nganji@...eaurora.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [v2] drm/msm: add shutdown support for display platform_driver

On Tue, Aug 18, 2020 at 3:03 AM Sai Prakash Ranjan
<saiprakash.ranjan@...eaurora.org> wrote:
>
> Hi,
>
> On 2020-06-01 16:33, Krishna Manikandan wrote:
> > Define shutdown callback for display drm driver,
> > so as to disable all the CRTCS when shutdown
> > notification is received by the driver.
> >
> > This change will turn off the timing engine so
> > that no display transactions are requested
> > while mmu translations are getting disabled
> > during reboot sequence.
> >
> > Signed-off-by: Krishna Manikandan <mkrishn@...eaurora.org>
> >
> > Changes in v2:
> >       - Remove NULL check from msm_pdev_shutdown (Stephen Boyd)
> >       - Change commit text to reflect when this issue
> >         was uncovered (Sai Prakash Ranjan)
> > ---
> >  drivers/gpu/drm/msm/msm_drv.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/msm/msm_drv.c
> > b/drivers/gpu/drm/msm/msm_drv.c
> > index e4b750b..94e3963 100644
> > --- a/drivers/gpu/drm/msm/msm_drv.c
> > +++ b/drivers/gpu/drm/msm/msm_drv.c
> > @@ -1322,6 +1322,13 @@ static int msm_pdev_remove(struct
> > platform_device *pdev)
> >       return 0;
> >  }
> >
> > +static void msm_pdev_shutdown(struct platform_device *pdev)
> > +{
> > +     struct drm_device *drm = platform_get_drvdata(pdev);
> > +
> > +     drm_atomic_helper_shutdown(drm);
> > +}
> > +
> >  static const struct of_device_id dt_match[] = {
> >       { .compatible = "qcom,mdp4", .data = (void *)KMS_MDP4 },
> >       { .compatible = "qcom,mdss", .data = (void *)KMS_MDP5 },
> > @@ -1334,6 +1341,7 @@ static int msm_pdev_remove(struct platform_device
> > *pdev)
> >  static struct platform_driver msm_platform_driver = {
> >       .probe      = msm_pdev_probe,
> >       .remove     = msm_pdev_remove,
> > +     .shutdown   = msm_pdev_shutdown,
> >       .driver     = {
> >               .name   = "msm",
> >               .of_match_table = dt_match,
>
> Any more comments on this patch?

sorry, I managed to overlook this earlier.. I've pulled it in to msm-next

BR,
-R

> Thanks,
> Sai
>
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
> member
> of Code Aurora Forum, hosted by The Linux Foundation