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

From Alex Hung
e43cf7abece2efaebe0a757909d258212d01c404 in linux-6.1.y/6.1.28
0b5dfe12755f87ec014bb4cc1930485026167430 in mainline linux

diff --git a/sys/dev/pci/drm/amd/display/modules/power/power_helpers.c b/sys/dev/pci/drm/amd/display/modules/power/power_helpers.c
index 01fc6a3..9edd393 100644 (file)
--- a/sys/dev/pci/drm/amd/display/modules/power/power_helpers.c
+++ b/sys/dev/pci/drm/amd/display/modules/power/power_helpers.c
@@ -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) {