Patch "drm/amd/display: Disable scaling on DCE6 for now" has been added to the 6.12-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: Disable scaling on DCE6 for now

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-disable-scaling-on-dce6-for-now.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-232626-greg=kroah.com@vger.kernel.org Wed Apr  1 02:45:16 2026
From: Rosen Penev <rosenp@gmail.com>
Date: Tue, 31 Mar 2026 17:39:06 -0700
Subject: drm/amd/display: Disable scaling on DCE6 for now
To: stable@vger.kernel.org
Cc: "Alex Deucher" <alexander.deucher@amd.com>, "Christian König" <christian.koenig@amd.com>, "Xinhui Pan" <Xinhui.Pan@amd.com>, "David Airlie" <airlied@gmail.com>, "Simona Vetter" <simona@ffwll.ch>, "Harry Wentland" <harry.wentland@amd.com>, "Leo Li" <sunpeng.li@amd.com>, "Rodrigo Siqueira" <Rodrigo.Siqueira@amd.com>, "Ray Wu" <ray.wu@amd.com>, "Wayne Lin" <wayne.lin@amd.com>, "Mario Limonciello" <Mario.Limonciello@amd.com>, "Roman Li" <Roman.Li@amd.com>, "Eric Yang" <Eric.Yang2@amd.com>, "Tony Cheng" <Tony.Cheng@amd.com>, "Mauro Rossi" <issor.oruam@gmail.com>, "Timur Kristóf" <timur.kristof@gmail.com>, "Alex Hung" <alex.hung@amd.com>, amd-gfx@lists.freedesktop.org (open list:RADEON and AMDGPU DRM DRIVERS), dri-devel@lists.freedesktop.org (open list:DRM DRIVERS), linux-kernel@vger.kernel.org (open list)
Message-ID: <20260401003908.3438-9-rosenp@gmail.com>

From: Timur Kristóf <timur.kristof@gmail.com>

[ Upstream commit 0e190a0446ec517666dab4691b296a9b758e590f ]

Scaling doesn't work on DCE6 at the moment, the current
register programming produces incorrect output when using
fractional scaling (between 100-200%) on resolutions higher
than 1080p.

Disable it until we figure out how to program it properly.

Fixes: 7c15fd86aaec ("drm/amd/display: dc/dce: add initial DCE6 support (v10)")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c
@@ -404,13 +404,13 @@ static const struct dc_plane_cap plane_c
 	},
 
 	.max_upscale_factor = {
-			.argb8888 = 16000,
+			.argb8888 = 1,
 			.nv12 = 1,
 			.fp16 = 1
 	},
 
 	.max_downscale_factor = {
-			.argb8888 = 250,
+			.argb8888 = 1,
 			.nv12 = 1,
 			.fp16 = 1
 	}


Patches currently in stable-queue which might be from rosenp@gmail.com are

queue-6.12/drm-amd-amdgpu-decouple-aspm-with-pcie-dpm.patch
queue-6.12/drm-amd-display-reject-modes-with-too-high-pixel-clock-on-dce6-10.patch
queue-6.12/drm-amd-display-fix-dce-6.0-and-6.4-pll-programming.patch
queue-6.12/drm-amd-display-disable-scaling-on-dce6-for-now.patch
queue-6.12/drm-amd-display-disable-fastboot-on-dce-6-too.patch
queue-6.12/drm-amd-display-correct-logic-check-error-for-fastboot.patch
queue-6.12/drm-amd-amdgpu-disable-aspm-in-some-situations.patch
queue-6.12/drm-amd-display-keep-pll0-running-on-dce-6.0-and-6.4.patch
queue-6.12/drm-amd-display-adjust-dce-8-10-clock-don-t-overclock-by-15.patch
queue-6.12/drm-amd-disable-aspm-on-si.patch