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drm/amd/display: Fix a bug when searching for insert_above_mpcc

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commit 3d028d5d60d516c536de1ddd3ebf3d55f3f8983b upstream.

[WHY]
Currently, when insert_plane is called with insert_above_mpcc
parameter that is equal to tree->opp_list, the function returns NULL.

[HOW]
Instead, the function should insert the plane at the top of the tree.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jun Lei <jun.lei@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Wesley Chalmers <wesley.chalmers@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wesley Chalmers 2023-06-21 19:13:26 -04:00 committed by Greg Kroah-Hartman
parent 3ce9925584
commit 77b49370a2
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c
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@ -212,8 +212,9 @@ struct mpcc *mpc1_insert_plane(
/* check insert_above_mpcc exist in tree->opp_list */
struct mpcc *temp_mpcc = tree->opp_list;
while (temp_mpcc && temp_mpcc->mpcc_bot != insert_above_mpcc)
temp_mpcc = temp_mpcc->mpcc_bot;
if (temp_mpcc != insert_above_mpcc)
while (temp_mpcc && temp_mpcc->mpcc_bot != insert_above_mpcc)
temp_mpcc = temp_mpcc->mpcc_bot;
if (temp_mpcc == NULL)
return NULL;
}