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 <tzimmerm...@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
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