This is a note to let you know that I've just added the patch titled
drm/vc4: Move IRQ enable to PM path
to the 4.14-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-vc4-move-irq-enable-to-pm-path.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Feb 1 13:45:42 CET 2018
From: Stefan Schake <stschake@xxxxxxxxx>
Date: Fri, 29 Dec 2017 17:05:43 +0100
Subject: drm/vc4: Move IRQ enable to PM path
From: Stefan Schake <stschake@xxxxxxxxx>
[ Upstream commit ce9caf2f79a5aa170a4b6456a03db639eed9c988 ]
We were calling enable_irq on bind, where it was already enabled previously
by the IRQ helper. Additionally, dev->irq is not set correctly until after
postinstall and so was always zero here, triggering a warning in 4.15.
Fix both by moving the enable to the power management resume path, where we
know there was a previous disable invocation during suspend.
Fixes: 253696ccd613 ("drm/vc4: Account for interrupts in flight")
Signed-off-by: Stefan Schake <stschake@xxxxxxxxx>
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/1514563543-32511-1-git-send-email-stschake@xxxxxxxxx
Tested-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
Reviewed-by: Eric Anholt <eric@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vc4/vc4_irq.c | 3 ---
drivers/gpu/drm/vc4/vc4_v3d.c | 3 +++
2 files changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_irq.c
+++ b/drivers/gpu/drm/vc4/vc4_irq.c
@@ -208,9 +208,6 @@ vc4_irq_postinstall(struct drm_device *d
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
- /* Undo the effects of a previous vc4_irq_uninstall. */
- enable_irq(dev->irq);
-
/* Enable both the render done and out of memory interrupts. */
V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS);
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
@@ -327,6 +327,9 @@ static int vc4_v3d_runtime_resume(struct
return ret;
vc4_v3d_init_hw(vc4->dev);
+
+ /* We disabled the IRQ as part of vc4_irq_uninstall in suspend. */
+ enable_irq(vc4->dev->irq);
vc4_irq_postinstall(vc4->dev);
return 0;
Patches currently in stable-queue which might be from stschake@xxxxxxxxx are
queue-4.14/drm-vc4-move-irq-enable-to-pm-path.patch
queue-4.14/drm-vc4-account-for-interrupts-in-flight.patch