linux-kernel - Re: [RFC][PATCH] drm: kirin: Remove useless "Scale not support" error message

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Date:   Fri, 22 Jun 2018 10:34:48 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Xinliang Liu <z.liuxinliang@...ilicon.com>,
        Rongrong Zou <zourongrong@...il.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Chen Feng <puck.chen@...ilicon.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Peter Griffin <peter.griffin@...aro.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC][PATCH] drm: kirin: Remove useless "Scale not support"
 error message

On Thu, Jun 21, 2018 at 04:01:16PM -0700, John Stultz wrote:
> The driver doesn't support scaling, but when an atomic test is done
> it repeatedly spits out this warning which isn't particularly useful.
> 
> So just remove the error message.
> 
> Cc: Xinliang Liu <z.liuxinliang@...ilicon.com>
> Cc: Rongrong Zou <zourongrong@...il.com>
> Cc: Xinwei Kong <kong.kongxinwei@...ilicon.com>
> Cc: Chen Feng <puck.chen@...ilicon.com>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Peter Griffin <peter.griffin@...aro.org>
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>

Makes sense, applied to drm-misc-next. This code should probably use
drm_atomic_helper_check_plane_state() anyway, which also comes with a
useful set of opt-in debug output to replace this.
-Daniel

> ---
>  drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> index 2269be9..bb77420 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> @@ -859,7 +859,6 @@ static int ade_plane_atomic_check(struct drm_plane *plane,
>  		return PTR_ERR(crtc_state);
>  
>  	if (src_w != crtc_w || src_h != crtc_h) {
> -		DRM_ERROR("Scale not support!!!\n");
>  		return -EINVAL;
>  	}
>  
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch