drm/amd/display: Avoid MPC infinite loop

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[ Upstream commit 8de297dc04 ]

[why]
In some cases MPC tree bottom pipe ends up point to itself.  This causes
iterating from top to bottom to hang the system in an infinite loop.

[how]
When looping to next MPC bottom pipe, check that the pointer is not same
as current to avoid infinite loop.

Reviewed-by: Josip Pavic <Josip.Pavic@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Josip Pavic 2022-07-21 15:33:00 -04:00 • committed by Greg Kroah-Hartman

parent ab01ac7fa9

commit b26218b234

2 changed files with 12 additions and 0 deletions

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6

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c

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6

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c

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