Patch "drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()

to the 4.9-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-fsl-dcu-enable-irq-before-drm_atomic_helper_resume.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Stefan Agner <[email protected]>
Date: Fri, 10 Nov 2017 10:15:28 +0100
Subject: drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()

From: Stefan Agner <[email protected]>

commit 9fd99f4f3f5e13ce959900ae57d64b1bdb51d823 upstream.

The resume helpers wait for a vblank to occurre hence IRQ need to be enabled. This avoids a warning as follows during resume:

  WARNING: CPU: 0 PID: 314 at drivers/gpu/drm/drm_atomic_helper.c:1249 drm_atomic_helper_wait_for_vblanks.part.1+0x284/0x288
  [CRTC:28:crtc-0] vblank wait timed out

---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -265,6 +265,7 @@ static int fsl_dcu_drm_pm_resume(struct
 	if (fsl_dev->tcon)
 		fsl_tcon_bypass_enable(fsl_dev->tcon);
 	fsl_dcu_drm_init_planes(fsl_dev->drm);
+	enable_irq(fsl_dev->irq);
 	drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
 
 	console_lock();

@@ -272,7 +273,6 @@ static int fsl_dcu_drm_pm_resume(struct
 	console_unlock();
 
 	drm_kms_helper_poll_enable(fsl_dev->drm);
-	enable_irq(fsl_dev->irq);
 
 	return 0;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/drm-fsl-dcu-avoid-disabling-pixel-clock-twice-on-suspend.patch queue-4.9/drm-fsl-dcu-enable-irq-before-drm_atomic_helper_resume.patch