linux-kernel - Re: [PATCH 1/3] drm/simpledrm: Do not call drm_atomic_add_affected

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Date:   Tue, 11 Oct 2022 15:09:45 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/3] drm/simpledrm: Do not call
 drm_atomic_add_affected_planes()

Hello Thomas,

On 10/11/22 15:06, Thomas Zimmermann wrote:
> Hi
> 
> Am 10.10.22 um 19:02 schrieb Javier Martinez Canillas:
>> There's no need to add planes to the atomic state. Remove the call
>> to drm_atomic_add_affected_planes() from simpledrm.
>>
>> On full modesets, the DRM helpers already add a CRTC's planes to the
>> atomic state; see drm_atomic_helper_check_modeset(). There's no reason
>> to call drm_atomic_add_affected_planes() unconditionally in the CRTC's
>> atomic_check() in simpledrm. It's also too late, as the atomic_check()
>> of the added planes will not be called before the commit.
>>
>> Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> 
> Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
>

Thanks.
 
> There's also drm_atomic_add_affected_planes() in mgag200. Since you're 
> at it, I'd appreciate a patch.
>

Sure, I'll include in v2. I noticed that but didn't feel like posting
a patch because I'm not familiar with that device nor have HW to test.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat