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%3Ba=su...

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@vger.kernel.org know about it.

From foo@baz Thu Feb 1 13:45:42 CET 2018

From: Stefan Schake stschake@gmail.com Date: Fri, 29 Dec 2017 17:05:43 +0100 Subject: drm/vc4: Move IRQ enable to PM path

From: Stefan Schake stschake@gmail.com

[ 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@gmail.com Signed-off-by: Eric Anholt eric@anholt.net Link: https://patchwork.freedesktop.org/patch/msgid/1514563543-32511-1-git-send-em... Tested-by: Stefan Wahren stefan.wahren@i2se.com Reviewed-by: Eric Anholt eric@anholt.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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@gmail.com are

queue-4.14/drm-vc4-move-irq-enable-to-pm-path.patch queue-4.14/drm-vc4-account-for-interrupts-in-flight.patch