Commit 0b5dfe12 authored Apr 03, 2023 by Alex Hung Committed by Alex Deucher Apr 18, 2023

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



[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

parent 1e994cc0

drivers/gpu/drm/amd/display/modules/power/power_helpers.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -934,6 +934,10 @@ bool psr_su_set_dsc_slice_height(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;
		config->dsc_slice_height = slice_height;