[PATCH 04/20] drm/amd/display: Know what a pageflip is

[sunpeng.li at amd.com]

From: David Francis <David.Francis at amd.com>

[Why]
We were assuming that any commit with allow_modeset == false
was a pageflip.  This was against drm intention and only
worked by sheer luck

[How]
A pageflip is the change from one framebuffer to another

Signed-off-by: David Francis <David.Francis at amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland at amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 405c263..db060da 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4995,6 +4995,8 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 		struct drm_crtc *crtc = new_plane_state->crtc;
 		struct drm_crtc_state *new_crtc_state;
 		struct drm_framebuffer *fb = new_plane_state->fb;
+		struct amdgpu_framebuffer *afb = to_amdgpu_framebuffer(fb);
+		struct amdgpu_framebuffer *old_afb = to_amdgpu_framebuffer(old_plane_state->fb);
 		bool pflip_needed;
 		struct dm_plane_state *dm_new_plane_state = to_dm_plane_state(new_plane_state);
 
@@ -5010,7 +5012,8 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 		if (!new_crtc_state->active)
 			continue;
 
-		pflip_needed = !state->allow_modeset;
+		pflip_needed = old_plane_state->fb &&
+			(old_plane_state->fb != new_plane_state->fb || afb->address != old_afb->address);
 
 		spin_lock_irqsave(&crtc->dev->event_lock, flags);
 		if (acrtc_attach->pflip_status != AMDGPU_FLIP_NONE) {
-- 
2.7.4