drm/amd/display: Fix MPO & pipe split on 3-pipe dcn2x

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[WHY]
DML is incorrectly initialized with 4 pipes on 3 pipe configs
RequiredDPPCLK is halved on unsplit pipe due to an incorrectly handled 3 pipe
case, causing underflow with 2 planes & pipe split (MPO, 8K + 2nd display)

[HOW]
Set correct number of DPP/OTGs for dml init to generate correct DPP topology
Double RequiredDPPCLK after clock is halved for pipe split
and find_secondary_pipe fails to fix underflow

Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Michael Strauss 2019-10-01 11:24:32 -04:00 • committed by Alex Deucher

parent 78ea008bcd

commit ff86391ee6

2 changed files with 12 additions and 2 deletions

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5

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

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9

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

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