drm/amd/display: Use the correct max downscaling value for DCN3.x family
authorNikola Cornij <nikola.cornij@amd.com>
Fri, 7 May 2021 02:46:52 +0000 (22:46 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 20 May 2021 02:39:32 +0000 (22:39 -0400)
commit60d177fdf8843602e1eb9dfb4900a0d260d32c1b
tree7892abacf1af72e638dfbb72bf70068e3f23aa8a
parentbbc49fc0326be4f1518fa9d81e527ebf989e6d4e
drm/amd/display: Use the correct max downscaling value for DCN3.x family

[why]
As per spec, DCN3.x can do 6:1 downscaling and DCN2.x can do 4:1. The
max downscaling limit value for DCN2.x is 250, which means it's
calculated as 1000 / 4 = 250. For DCN3.x this then gives 1000 / 6 = 167.

[how]
Set maximum downscaling limit to 167 for DCN3.x

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c
drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c