This is a note to let you know that I've just added the patch titled
[PATCH] drm/radeon: Ensure vblank interrupt is enabled on DPMS transition to on
to the 4.4-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-radeon-ensure-vblank-interrupt-is-enabled-on-dpms-transition-to-on.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From michel@xxxxxxxxxxx Tue Nov 29 16:29:26 2016
From: Michel Dänzer <michel@xxxxxxxxxxx>
Date: Tue, 29 Nov 2016 18:40:20 +0900
Subject: [PATCH] drm/radeon: Ensure vblank interrupt is enabled on DPMS transition to on
To: stable@xxxxxxxxxxxxxxx
Cc: Max Staudt <mstaudt@xxxxxxx>
Message-ID: <20161129094020.27353-1-michel@xxxxxxxxxxx>
From: Michel Dänzer <michel@xxxxxxxxxxx>
NOTE: This patch only applies to 4.5.y or older kernels. With newer
kernels, this problem cannot happen because the driver now uses
drm_crtc_vblank_on/off instead of drm_vblank_pre/post_modeset[0]. I
consider this patch safer for older kernels than backporting the API
change, because drm_crtc_vblank_on/off had various issues in older
kernels, and I'm not sure all fixes for those have been backported to
all stable branches where this patch could be applied.
---------------------
Fixes the vblank interrupt being disabled when it should be on, which
can cause at least the following symptoms:
* Hangs when running 'xset dpms force off' in a GNOME session with
gnome-shell using DRI2.
* RandR 1.4 slave outputs freezing with garbage displayed using
xf86-video-ati 7.8.0 or newer.
[0] See upstream commit:
commit 777e3cbc791f131806d9bf24b3325637c7fc228d
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Thu Jan 21 11:08:57 2016 +0100
drm/radeon: Switch to drm_vblank_on/off
Reported-and-Tested-by: Max Staudt <mstaudt@xxxxxxx>
Reviewed-by: Daniel Vetter <daniel@xxxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Michel Dänzer <michel.daenzer@xxxxxxx>
---
drivers/gpu/drm/radeon/atombios_crtc.c | 2 ++
drivers/gpu/drm/radeon/radeon_legacy_crtc.c | 2 ++
2 files changed, 4 insertions(+)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -275,6 +275,8 @@ void atombios_crtc_dpms(struct drm_crtc
atombios_enable_crtc_memreq(crtc, ATOM_ENABLE);
atombios_blank_crtc(crtc, ATOM_DISABLE);
drm_vblank_post_modeset(dev, radeon_crtc->crtc_id);
+ /* Make sure vblank interrupt is still enabled if needed */
+ radeon_irq_set(rdev);
radeon_crtc_load_lut(crtc);
break;
case DRM_MODE_DPMS_STANDBY:
--- a/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
@@ -331,6 +331,8 @@ static void radeon_crtc_dpms(struct drm_
WREG32_P(RADEON_CRTC_EXT_CNTL, crtc_ext_cntl, ~(mask | crtc_ext_cntl));
}
drm_vblank_post_modeset(dev, radeon_crtc->crtc_id);
+ /* Make sure vblank interrupt is still enabled if needed */
+ radeon_irq_set(rdev);
radeon_crtc_load_lut(crtc);
break;
case DRM_MODE_DPMS_STANDBY:
Patches currently in stable-queue which might be from michel@xxxxxxxxxxx are
queue-4.4/drm-radeon-ensure-vblank-interrupt-is-enabled-on-dpms-transition-to-on.patch
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