drm/amd/display: Reduce SubVP + DRR stretch margin

[Description]
- Having excessively large margin causes failure in the static
  schedulability check in some cases for SubVP + DRR
- 100us of DRR margin is sufficient based on a weeks worth of
  stress testing on different display configs

Reviewed-by: Michael Strauss <Michael.Strauss@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@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/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
index 181a340..2528400 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
@@ -144,7 +144,7 @@ struct test_pattern {
        unsigned int cust_pattern_size;
 };
 
-#define SUBVP_DRR_MARGIN_US 600 // 600us for DRR margin (SubVP + DRR)
+#define SUBVP_DRR_MARGIN_US 100 // 100us for DRR margin (SubVP + DRR)
 
 enum mall_stream_type {
        SUBVP_NONE, // subvp not in use