From: jsg <jsg@openbsd.org>
Date: Fri, 12 May 2023 11:00:22 +0000 (+0000)
Subject: drm/amd/display: fix a divided-by-zero error
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=7db262ea5d18b3c6bb2447a53a8916731dd9a4bc;p=openbsd

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 01fc6a368d2..9edd39322c8 100644
--- 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) {