From fc2a69f3903dfd97cd47f593e642b47918c949df Mon Sep 17 00:00:00 2001
From: Satendra Singh Thakur <satendra.t@samsung.com>
Date: Thu, 3 May 2018 11:19:32 +0530
Subject: [PATCH] drm/atomic: Handling the case when setting old crtc for plane
Git-commit: fc2a69f3903dfd97cd47f593e642b47918c949df
Patch-mainline: v4.18-rc1
References: bsc#1051510
In the func drm_atomic_set_crtc_for_plane, with the current code,
if crtc of the plane_state and crtc passed as argument to the func
are same, entire func will executed in vein.
It will get state of crtc and clear and set the bits in plane_mask.
All these steps are not required for same old crtc.
Ideally, we should do nothing in this case, this patch handles the same,
and causes the program to return without doing anything in such scenario.
Signed-off-by: Satendra Singh Thakur <satendra.t@samsung.com>
Cc: Madhur Verma <madhur.verma@samsung.com>
Cc: Hemanshu Srivastava <hemanshu.s@samsung.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1525326572-25854-1-git-send-email-satendra.t@samsung.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/drm_atomic.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1433,7 +1433,9 @@ drm_atomic_set_crtc_for_plane(struct drm
{
struct drm_plane *plane = plane_state->plane;
struct drm_crtc_state *crtc_state;
-
+ /* Nothing to do for same crtc*/
+ if (plane_state->crtc == crtc)
+ return 0;
if (plane_state->crtc) {
crtc_state = drm_atomic_get_crtc_state(plane_state->state,
plane_state->crtc);