[PATCH] drm/ast: Don't check new mode if CRTC is being disabled

[Sam Ravnborg]

Hi Thomas.

On Thu, Apr 30, 2020 at 11:13:30AM +0200, Thomas Zimmermann wrote:
> Suspending failed because there's no mode if the CRTC is being
> disabled. Early-out in this case. This fixes runtime PM for ast.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>

Don't you miss:

Reported-by:
Tested-by:
Fixes:
???

	Sam

> ---
>  drivers/gpu/drm/ast/ast_mode.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
> index 7a9f20a2fd303..089b7d9a0cf3f 100644
> --- a/drivers/gpu/drm/ast/ast_mode.c
> +++ b/drivers/gpu/drm/ast/ast_mode.c
> @@ -801,6 +801,9 @@ static int ast_crtc_helper_atomic_check(struct drm_crtc *crtc,
>  		return -EINVAL;
>  	}
>  
> +	if (!state->enable)
> +		return 0; /* no checks required if CRTC is being disabled */
> +
>  	ast_state = to_ast_crtc_state(state);
>  
>  	format = ast_state->format;
> -- 
> 2.26.0