From: Thomas Zimmermann <tzimmermann@xxxxxxx>
commit d6ddbd5c97d1b9156646ac5c42b8851edd664ee2 upstream.
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>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
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+
Link: https://patchwork.freedesktop.org/patch/msgid/20200507090640.21561-1-tzimmermann@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ast/ast_mode.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -802,6 +802,9 @@ static int ast_crtc_helper_atomic_check(
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;
