Commit b97089b8 authored by George Shen's avatar George Shen Committed by Alex Deucher
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drm/amd/display: Update 128b/132b downspread factor to 0.3% 



[Why]
Updating downspread factor to 0.3% to add additional margin to account
for potential link rate deviations (up to 300ppm as per the DP spec).

Reviewed-by: default avatarWenjing Liu <wenjing.liu@amd.com>
Acked-by: default avatarAlan Liu <haoping.liu@amd.com>
Signed-off-by: default avatarGeorge Shen <george.shen@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent fff7b95a

drivers/gpu/drm/amd/display/include/link_service_types.h

+1 −1
Original line number Diff line number Diff line
@@ -53,7 +53,7 @@ enum { 
	BITS_PER_DP_BYTE = 10,

	DATA_EFFICIENCY_8b_10b_x10000 = 8000, /* 80% data efficiency */

	DATA_EFFICIENCY_8b_10b_FEC_EFFICIENCY_x100 = 97, /* 97% data efficiency when FEC is enabled */

	DATA_EFFICIENCY_128b_132b_x10000 = 9646, /* 96.71% data efficiency x 99.75% downspread factor */

	DATA_EFFICIENCY_128b_132b_x10000 = 9641, /* 96.71% data efficiency x 99.7% downspread factor */

};



enum lttpr_mode {