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drm/amd/display: Avoid MPC infinite loop 

[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>
This commit is contained in:
Aric Cyr 2022-07-11 10:03:03 -04:00 committed by Alex Deucher
parent 4c5aa59492
commit 8de297dc04
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c
View File

@ -49,6 +49,11 @@ void mpc1_set_bg_color(struct mpc *mpc,
/* find bottommost mpcc. */
while (bottommost_mpcc->mpcc_bot) {
/* avoid circular linked link */
ASSERT(bottommost_mpcc != bottommost_mpcc->mpcc_bot);
if (bottommost_mpcc == bottommost_mpcc->mpcc_bot)
break;
bottommost_mpcc = bottommost_mpcc->mpcc_bot;
}