FAILED: patch "[PATCH] Revert "drm/amd/display: Fix overlay validation by" failed to apply to 5.13-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.13-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e7d9560aeae51415f6c9bc343feb783a441ff4c5 Mon Sep 17 00:00:00 2001
From: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Date: Wed, 16 Jun 2021 12:21:30 -0400
Subject: [PATCH] Revert "drm/amd/display: Fix overlay validation by
 considering cursors"

This reverts commit 33f409e60eb0c59a4d0d06a62ab4642a988e17f7.

The patch that we are reverting here was originally applied because it
fixes multiple IGT issues and flickering in Android. However, after a
discussion with Sean Paul and Mark, it looks like that this patch might
cause problems on ChromeOS. For this reason, we decided to revert this
patch.

Cc: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Cc: Harry Wentland <Harry.Wentland@amd.com>
Cc: Hersen Wu <hersenxs.wu@amd.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Mark Yacoub <markyacoub@chromium.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

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 2688a2e759de..cfb2f9e43661 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10120,8 +10120,8 @@ static int validate_overlay(struct drm_atomic_state *state)
 {
 	int i;
 	struct drm_plane *plane;
-	struct drm_plane_state *new_plane_state;
-	struct drm_plane_state *primary_state, *cursor_state, *overlay_state = NULL;
+	struct drm_plane_state *old_plane_state, *new_plane_state;
+	struct drm_plane_state *primary_state, *overlay_state = NULL;
 
 	/* Check if primary plane is contained inside overlay */
 	for_each_new_plane_in_state_reverse(state, plane, new_plane_state, i) {
@@ -10151,14 +10151,6 @@ static int validate_overlay(struct drm_atomic_state *state)
 	if (!primary_state->crtc)
 		return 0;
 
-	/* check if cursor plane is enabled */
-	cursor_state = drm_atomic_get_plane_state(state, overlay_state->crtc->cursor);
-	if (IS_ERR(cursor_state))
-		return PTR_ERR(cursor_state);
-
-	if (drm_atomic_plane_disabling(plane->state, cursor_state))
-		return 0;
-
 	/* Perform the bounds check to ensure the overlay plane covers the primary */
 	if (primary_state->crtc_x < overlay_state->crtc_x ||
 	    primary_state->crtc_y < overlay_state->crtc_y ||