[PATCH 31/66] drm/amd/display: fix a divided-by-zero error

[Qingqing Zhuo]

From: Alex Hung <alex.h...@amd.com>

[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.pil...@amd.com>
Acked-by: Qingqing Zhuo <qingqing.z...@amd.com>
Signed-off-by: Alex Hung <alex.h...@amd.com>
---
 drivers/gpu/drm/amd/display/modules/power/power_helpers.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c 
b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
index 0d3a983cb9ec..51e76bce92ea 100644
--- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
+++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
@@ -927,6 +927,10 @@ 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;
 
-- 
2.34.1