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

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Message-ID: <dbdc34a0-bead-491e-a0fb-2f74416b7366@linaro.org>
Date: Wed, 20 Mar 2024 17:09:44 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Doug Anderson <dianders@...omium.org>,
 Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: 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

On 20/03/2024 16:33, Doug Anderson wrote:
> 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.

Thx I wasn't really sure where to push this so I waited v6.9-rc1 to decide!