From: Dillon Varone <Dillon.Varone@amd.com>
Date: Thu, 3 Nov 2022 22:33:38 +0000 (-0400)
Subject: drm/amd/display: Fix prefetch calculations for dcn32
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c9e6aeb5885da86d417ce11e0f54416122665e19;p=linux.git

drm/amd/display: Fix prefetch calculations for dcn32

[Description]
Prefetch calculation loop was not exiting until utilizing all of vstartup if it
failed once.  Locals need to be reset on each iteration of the loop.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Dillon Varone <Dillon.Varone@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
index 7aaf67b464e0d..e5c8f6a71b5b4 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
@@ -718,6 +718,8 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
 
 	do {
 		MaxTotalRDBandwidth = 0;
+		DestinationLineTimesForPrefetchLessThan2 = false;
+		VRatioPrefetchMoreThanMax = false;
 #ifdef __DML_VBA_DEBUG__
 		dml_print("DML::%s: Start loop: VStartup = %d\n", __func__, mode_lib->vba.VStartupLines);
 #endif