linux-kernel - Re: [PATCH v2 1/4] drm/mgag200: Do not call drm_atomic_add_affected

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Date:   Wed, 12 Oct 2022 09:28:31 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     Daniel Vetter <daniel@...ll.ch>, Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 1/4] drm/mgag200: Do not call
 drm_atomic_add_affected_planes()



Am 11.10.22 um 18:51 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 mgag200.
> 
> 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 mgag200. 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>

> ---
> 
> (no changes since v1)
> 
>   drivers/gpu/drm/mgag200/mgag200_mode.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
> index 5f7eb642f0c6..758629da95d9 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_mode.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
> @@ -601,7 +601,7 @@ int mgag200_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_st
>   		}
>   	}
>   
> -	return drm_atomic_add_affected_planes(new_state, crtc);
> +	return 0;
>   }
>   
>   void mgag200_crtc_helper_atomic_flush(struct drm_crtc *crtc, struct drm_atomic_state *old_state)

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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