Commit 7dbd2053 authored by Daniel Miess's avatar Daniel Miess Committed by Greg Kroah-Hartman
Browse files

drm/amd/display: Adjust downscaling limits for dcn314 



[ Upstream commit dd2db2dc ]

[Why]
Lower max_downscale_ratio and ARGB888 downscale factor
to prevent cases where underflow may occur on dcn314

[How]
Set max_downscale_ratio to 400 and ARGB downscale factor
to 250 for dcn314

Reviewed-by: default avatarNicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: default avatarAlex Hung <alex.hung@amd.com>
Signed-off-by: default avatarDaniel Miess <Daniel.Miess@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 0c42622a

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c

+3 −2
Original line number Diff line number Diff line
@@ -871,8 +871,9 @@ static const struct dc_plane_cap plane_cap = { 
	},



	// 6:1 downscaling ratio: 1000/6 = 166.666

	// 4:1 downscaling ratio for ARGB888 to prevent underflow during P010 playback: 1000/4 = 250

	.max_downscale_factor = {

			.argb8888 = 167,

			.argb8888 = 250,

			.nv12 = 167,

			.fp16 = 167

	},
@@ -1755,7 +1756,7 @@ static bool dcn314_resource_construct( 
	pool->base.underlay_pipe_index = NO_UNDERLAY_PIPE;

	pool->base.pipe_count = pool->base.res_cap->num_timing_generator;

	pool->base.mpcc_count = pool->base.res_cap->num_timing_generator;

	dc->caps.max_downscale_ratio = 600;

	dc->caps.max_downscale_ratio = 400;

	dc->caps.i2c_speed_in_khz = 100;

	dc->caps.i2c_speed_in_khz_hdcp = 100;

	dc->caps.max_cursor_size = 256;