From 8a04026e92bd021d115543ed4968d7e22c439a75 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Wed, 24 Nov 2021 13:36:41 +0200
Subject: drm/i915/fbc: Flatten __intel_fbc_pre_update()
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Git-commit: 62d4874bee61d971b74dfd5fcd8032ff33746885
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

Use an early return to flatten most of __intel_fbc_pre_update().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211124113652.22090-10-ville.syrjala@linux.intel.com
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/i915/display/intel_fbc.c | 42 ++++++++++++------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 5ba79ef9b38f..2e4c6fff3d26 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1223,27 +1223,27 @@ static bool __intel_fbc_pre_update(struct intel_atomic_state *state,
 	intel_fbc_update_state_cache(state, crtc, plane);
 	fbc->flip_pending = true;
 
-	if (!intel_fbc_can_flip_nuke(state, crtc, plane)) {
-		intel_fbc_deactivate(fbc, "update pending");
-
-		/*
-		 * Display WA #1198: glk+
-		 * Need an extra vblank wait between FBC disable and most plane
-		 * updates. Bspec says this is only needed for plane disable, but
-		 * that is not true. Touching most plane registers will cause the
-		 * corruption to appear. Also SKL/derivatives do not seem to be
-		 * affected.
-		 *
-		 * TODO: could optimize this a bit by sampling the frame
-		 * counter when we disable FBC (if it was already done earlier)
-		 * and skipping the extra vblank wait before the plane update
-		 * if at least one frame has already passed.
-		 */
-		if (fbc->activated &&
-		    DISPLAY_VER(i915) >= 10)
-			need_vblank_wait = true;
-		fbc->activated = false;
-	}
+	if (intel_fbc_can_flip_nuke(state, crtc, plane))
+		return need_vblank_wait;
+
+	intel_fbc_deactivate(fbc, "update pending");
+
+	/*
+	 * Display WA #1198: glk+
+	 * Need an extra vblank wait between FBC disable and most plane
+	 * updates. Bspec says this is only needed for plane disable, but
+	 * that is not true. Touching most plane registers will cause the
+	 * corruption to appear. Also SKL/derivatives do not seem to be
+	 * affected.
+	 *
+	 * TODO: could optimize this a bit by sampling the frame
+	 * counter when we disable FBC (if it was already done earlier)
+	 * and skipping the extra vblank wait before the plane update
+	 * if at least one frame has already passed.
+	 */
+	if (fbc->activated && DISPLAY_VER(i915) >= 10)
+		need_vblank_wait = true;
+	fbc->activated = false;
 
 	return need_vblank_wait;
 }
-- 
2.38.1