linux-kernel - Re: [PATCH] drm/ssd130x: Use shadow-buffer helpers when managing plane's state

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Message-ID: <87o7jxs6ei.fsf@minerva.mail-host-address-is-not-set>
Date:   Thu, 27 Jul 2023 17:47:33 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, Maxime Ripard <mripard@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/ssd130x: Use shadow-buffer helpers when managing
 plane's state

Javier Martinez Canillas <javierm@...hat.com> writes:

> Thomas Zimmermann <tzimmermann@...e.de> writes:
>
> Hello Thomas,
>
>> Hi Javier
>>
>> Am 27.07.23 um 16:04 schrieb Javier Martinez Canillas:
>>> The commit 45b58669e532 ("drm/ssd130x: Allocate buffer in the plane's
>>> .atomic_check() callback") moved the buffers allocation to be done in
>>> the primary plane's .atomic_check() callback.
>>> 
>>> But it missed that since the driver uses a shadow-buffered plane, the
>>> __drm_gem_{reset,duplicate,destroy}_shadow_plane() helper functions
>>> must be used in the struct drm_plane_funcs handlers.
>>> 
>>> This was missed because the mentioned commit did not remove the macro
>>> DRM_GEM_SHADOW_PLANE_FUNCS, which leads to the custom plane's atomic
>>> state management handlers to not be used.
>>> 
>>> Fixes: 45b58669e532 ("drm/ssd130x: Allocate buffer in the plane's .atomic_check() callback")
>>> Reported-by: Arnd Bergmann <arnd@...db.de>
>>
>> Reported-by needs to be followed by
>>
>> Closes: <url>
>>
>> where <url> would point to Arnd's bug report on dri-devel.
>>
>
> Ah, I thought checkpatch complaining about it but since we already add a
> Link: with dim, didn't know what to add there. Makes sense to add Arnd's
> report indeed.
>
> I can include it when applying instead of posting a v2 if you don't mind.
>

Pushed to drm-misc (drm-misc-next), adding:

Closes: https://lore.kernel.org/dri-devel/20230727122412.2464210-1-arnd@kernel.org

Thanks!

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat