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drm/amd/display: Validate hw_points_num before using it

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[ Upstream commit 58c3b3341cea4f75dc8c003b89f8a6dd8ec55e50 ]

[WHAT]
hw_points_num is 0 before ogam LUT is programmed; however, function
"dwb3_program_ogam_pwl" assumes hw_points_num is always greater than 0,
i.e. substracting it by 1 as an array index.

[HOW]
Check hw_points_num is not equal to 0 before using it.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Hung 2023-07-10 18:23:58 -06:00 committed by Greg Kroah-Hartman
parent cc49ee3433
commit db3b679f66
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c
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@ -243,6 +243,9 @@ static bool dwb3_program_ogam_lut(
return false;
}
if (params->hw_points_num == 0)
return false;
REG_SET(DWB_OGAM_CONTROL, 0, DWB_OGAM_MODE, 2);
current_mode = dwb3_get_ogam_current(dwbc30);