From: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@amd.com>
Date: Fri, 2 Aug 2019 05:22:49 +0000 (+0530)
Subject: drm/amd/display: fix trigger not generated for freesync
X-Git-Tag: v5.4-rc1~106^2~7^2~17
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1e7f100ce8c0640634b794604880d9204480c9f1;p=thirdparty%2Flinux.git

drm/amd/display: fix trigger not generated for freesync

[Why]
In newer hardware MANUAL_FLOW_CONTROL is not a trigger bit. Due to this
front porch is fixed and in these hardware freesync does not work.

[How]
Change the programming to generate a pulse so that the event will be
triggered, front porch will be cut short and freesync will work.

Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
index e5e5be63032b8..e98e6bab48088 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
@@ -825,6 +825,9 @@ void optc1_program_manual_trigger(struct timing_generator *optc)
 
 	REG_SET(OTG_MANUAL_FLOW_CONTROL, 0,
 			MANUAL_FLOW_CONTROL, 1);
+
+	REG_SET(OTG_MANUAL_FLOW_CONTROL, 0,
+			MANUAL_FLOW_CONTROL, 0);
 }