Commit 027347d1 authored Jul 18, 2024 by Robin Chen Committed by Alex Deucher Aug 13, 2024

drm/amd/display: Optimize vstartup position for AS-SDP



[Why]
In current design, the vstartup position is adjusted to
vblank start position when AS-SDP is enabled.
However when the vblank length is too big, it may over
vstartup boundary.

[How]
To adjust vstartup position to 1 line before vsync position.

Reviewed-by: Anthony Koo <anthony.koo@amd.com>
Signed-off-by: Robin Chen <robin.chen@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 3bb41f2e

drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1132,7 +1132,8 @@ static void dcn20_adjust_freesync_v_startup(
		patched_crtc_timing.v_addressable -
		patched_crtc_timing.v_border_top;

		newVstartup = asic_blank_end + (patched_crtc_timing.v_total - asic_blank_start);
		/* The newVStartUp is 1 line before vsync point */
		newVstartup = asic_blank_end + 1;

		vstartup_start = ((newVstartup > vstartup_start) ? newVstartup : *vstartup_start);
		}