FAILED: patch "[PATCH] drm/amd/display: fix a divided-by-zero error" failed to apply to 6.2-stable tree

FAILED: patch "[PATCH] drm/amd/display: fix a divided-by-zero error" failed to apply to 6.2-stable tree

[gregkh]

The patch below does not apply to the 6.2-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.2.y
git checkout FETCH_HEAD
git cherry-pick -x 0b5dfe12755f87ec014bb4cc1930485026167430
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023042210-apache-rally-cc5e@gregkh' --subject-prefix 'PATCH 6.2.y' HEAD^..

Possible dependencies:

0b5dfe12755f ("drm/amd/display: fix a divided-by-zero error")
13b90cf900ab ("drm/amd/display: fix PSR-SU/DSC interoperability support")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0b5dfe12755f87ec014bb4cc1930485026167430 Mon Sep 17 00:00:00 2001
From: Alex Hung <alex.hung@amd.com>
Date: Mon, 3 Apr 2023 17:45:41 +0800
Subject: [PATCH] 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

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 e39b133d05af..b56f07f99d09 100644
--- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
+++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
@@ -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;