[PATCH 6.12 234/242] drm/amd/display: Disable scaling on DCE6 for now

Greg Kroah-Hartman
2026-04-08T18:49:25Z

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
}