On Thu, May 07, 2020 at 11:06:40AM +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.
>
> v3:
> * fixed commit message
> v2:
> * added Tested-by/Reported-by tags
> * added Fixes tags and CC (Sam)
> * improved comment
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Reported-by: Cary Garrett <cogarre@xxxxxxxxx>
> Tested-by: Cary Garrett <cogarre@xxxxxxxxx>
> Fixes: b48e1b6ffd28 ("drm/ast: Add CRTC helpers for atomic modesetting")
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.6+
Yeah legacy crtc helpers just let you shut stuff off and no checks.
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> 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..0cbbb21edb4e1 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 mode checks if CRTC is being disabled */
> +
> ast_state = to_ast_crtc_state(state);
>
> format = ast_state->format;
> --
> 2.26.0
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
