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

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Date:   Thu, 27 Jul 2023 17:16:53 +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

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.

>> Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
>
> This looks correct now. Thanks for fixing this bug quickly. With the 
> Close added:
>
> Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
>

Thanks and to you for pointing that out.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat