This is a note to let you know that I've just added the patch titled
drm/nouveau/kms/nv50-: fix panel scaling
to the 5.4-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-nouveau-kms-nv50-fix-panel-scaling.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 60100303df3b576c5bf4933d1b254a8c0b7c41eb
Author: Ben Skeggs <bskeggs@xxxxxxxxxx>
Date: Tue Dec 10 12:15:44 2019 +1000
drm/nouveau/kms/nv50-: fix panel scaling
[ Upstream commit 3d1890ef8023e61934e070021b06cc9f417260c0 ]
Under certain circumstances, encoder atomic_check() can be entered
without adjusted_mode having been reset to the same as mode, which
confuses the scaling logic and can lead to a misprogrammed display.
Fix this by checking against the user-provided mode directly.
Link: https://bugs.freedesktop.org/show_bug.cgi?id=108615
Link: https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/464
Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index b5b1a34f896f..d735ea7e2d88 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -326,9 +326,9 @@ nv50_outp_atomic_check_view(struct drm_encoder *encoder,
* same size as the native one (e.g. different
* refresh rate)
*/
- if (adjusted_mode->hdisplay == native_mode->hdisplay &&
- adjusted_mode->vdisplay == native_mode->vdisplay &&
- adjusted_mode->type & DRM_MODE_TYPE_DRIVER)
+ if (mode->hdisplay == native_mode->hdisplay &&
+ mode->vdisplay == native_mode->vdisplay &&
+ mode->type & DRM_MODE_TYPE_DRIVER)
break;
mode = native_mode;
asyc->scaler.full = true;
