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

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Message-ID: <576a5cce-a750-9ea4-c26c-eeb5e0bcddf3@suse.de>
Date:   Thu, 27 Jul 2023 17:44:50 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     dri-devel@...ts.freedesktop.org,
        Maxime Ripard <mripard@...nel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] drm/ssd130x: Use shadow-buffer helpers when managing
 plane's state



Am 27.07.23 um 17:16 schrieb Javier Martinez Canillas:
> 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.

Sure NP

> 
>>> 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.
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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