From: Archit Taneja <architt@codeaurora.org>
Date: Fri, 27 Oct 2017 16:27:32 +0530
Subject: drm/msm/mdp5: Don't use async plane update path if plane visibility
 changes
Git-commit: 18075d0d4849c670a09ec2056a4fecb994c6ee3e
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

When a plane moves out of bounds (i.e, outside the crtc clip region), the
plane state's "visible" parameter changes to false. When this happens, we
(a) release the hwpipe resources away from it, and
(b) unstage the corresponding hwpipe(s) from the Layer Mixers in the CRTC.

(a) requires use to acquire the global atomic state and assign a new
hwpipe. (b) requires us to re-configure the Layer Mixer, which is done in
the CRTC. We don't want to do these things in the async plane update path,
so return an error if the new state's "visible" isn't the same as the
current state's "visible".

Cc: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
@@ -470,6 +470,9 @@ static int mdp5_plane_atomic_async_check
 {
 	struct mdp5_plane_state *mdp5_state = to_mdp5_plane_state(state);
 	struct drm_crtc_state *crtc_state;
+	struct drm_rect clip;
+	int min_scale, max_scale;
+	int ret;
 
 	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
 							state->crtc);
@@ -495,6 +498,28 @@ static int mdp5_plane_atomic_async_check
 	    plane->state->fb != state->fb)
 		return -EINVAL;
 
+	clip.x1 = 0;
+	clip.y1 = 0;
+	clip.x2 = crtc_state->adjusted_mode.hdisplay;
+	clip.y2 = crtc_state->adjusted_mode.vdisplay;
+	min_scale = FRAC_16_16(1, 8);
+	max_scale = FRAC_16_16(8, 1);
+
+	ret = drm_plane_helper_check_state(state, &clip, min_scale,
+					   max_scale, true, true);
+	if (ret)
+		return ret;
+
+	/*
+	 * if the visibility of the plane changes (i.e, if the cursor is
+	 * clipped out completely, we can't take the async path because
+	 * we need to stage/unstage the plane from the Layer Mixer(s). We
+	 * also assign/unassign the hwpipe(s) tied to the plane. We avoid
+	 * taking the fast path for both these reasons.
+	 */
+	if (state->visible != plane->state->visible)
+		return -EINVAL;
+
 	return 0;
 }