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drm/amd/display: fix a divided-by-zero error

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[ Upstream commit 0b5dfe12755f87ec014bb4cc1930485026167430 ]

[Why & How]

timing.dsc_cfg.num_slices_v can be zero and it is necessary to check
before using it.

This fixes the error "divide error: 0000 [#1] PREEMPT SMP NOPTI".

Reviewed-by: Aurabindo Pillai <Aurabindo.Pillai@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Hung 2023-04-03 17:45:41 +08:00 committed by Greg Kroah-Hartman
parent 09c41688b6
commit e43cf7abec
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/modules/power/power_helpers.c
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@ -924,6 +924,10 @@ bool psr_su_set_y_granularity(struct dc *dc, struct dc_link *link,
pic_height = stream->timing.v_addressable +
stream->timing.v_border_top + stream->timing.v_border_bottom;
if (stream->timing.dsc_cfg.num_slices_v == 0)
return false;
slice_height = pic_height / stream->timing.dsc_cfg.num_slices_v;
if (slice_height) {