drm/amd/display: Lower DPP DTO only when safe
authorSung Lee <sung.lee@amd.com>
Wed, 4 Dec 2019 23:36:07 +0000 (18:36 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Wed, 18 Dec 2019 21:09:10 +0000 (16:09 -0500)
commit5479034576ec8b7166a66efe5de1d911feb43d4a
treea024b3c935b31cfa056c8ed7252b803cb2370647
parent68c0fca5e45a1fd1262e70d89857e2ede1995f6b
drm/amd/display: Lower DPP DTO only when safe

[Why]
A corner case currently exists where DPP DTO is lowered before
pipes are updated to a higher viewport. This causes underflow
as the DPPCLK is too low for the current viewport.

[How]
Only lower DPP DTO when it is safe to lower, or if
the newer clocks are higher than the current ones.

Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.h
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c