linux-kernel - Re: [PATCH] drm/panel: atna33xc20: Fix unbalanced regulator in the case HPD doesn't assert

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Date: Wed, 20 Mar 2024 08:33:28 -0700
From: Doug Anderson <dianders@...omium.org>
To: Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, Sam Ravnborg <sam@...nborg.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: atna33xc20: Fix unbalanced regulator in the
 case HPD doesn't assert

Hi,

On Thu, Mar 14, 2024 at 3:32 PM Jessica Zhang <quic_jesszhan@...cinc.com> wrote:
>
> On 3/13/2024 2:12 PM, Douglas Anderson via B4 Relay wrote:
> > From: Douglas Anderson <dianders@...omium.org>
> >
> > When the atna33xc20 driver was first written the resume code never
> > returned an error. If there was a problem waiting for HPD it just
> > printed a warning and moved on. This changed in response to review
> > feedback [1] on a future patch but I accidentally didn't account for
> > rolling back the regulator enable in the error cases. Do so now.
> >
> > [1] https://lore.kernel.org/all/5f3cf3a6-1cc2-63e4-f76b-4ee686764705@linaro.org/
> >
> > Fixes: 3b5765df375c ("drm/panel: atna33xc20: Take advantage of wait_hpd_asserted() in struct drm_dp_aux")
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > ---
> >   drivers/gpu/drm/panel/panel-samsung-atna33xc20.c | 22 +++++++++++++---------
> >   1 file changed, 13 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c b/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
> > index 76c2a8f6718c..9c336c71562b 100644
> > --- a/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
> > +++ b/drivers/gpu/drm/panel/panel-samsung-atna33xc20.c
> > @@ -109,19 +109,17 @@ static int atana33xc20_resume(struct device *dev)
> >               if (hpd_asserted < 0)
> >                       ret = hpd_asserted;
> >
> > -             if (ret)
> > +             if (ret) {
> >                       dev_warn(dev, "Error waiting for HPD GPIO: %d\n", ret);
> > -
> > -             return ret;
> > -     }
> > -
> > -     if (p->aux->wait_hpd_asserted) {
> > +                     goto error;
> > +             }
> > +     } else if (p->aux->wait_hpd_asserted) {
>
> Hi Doug,
>
> Acked-by: Jessica Zhang <quic_jesszhan@...cinc.com>

Pushed with Jessica's Ack to drm-misc-next.

5e842d55bad7 drm/panel: atna33xc20: Fix unbalanced regulator in the
case HPD doesn't assert

I chose drm-misc-next instead of drm-misc-fixes because this isn't
super urgent and the patch would have to be modified on drm-misc-fixes
because we don't have commit 8df1ddb5bf11 ("drm/dp: Don't attempt AUX
transfers when eDP panels are not powered") there.