[4.2.y-ckt stable] Patch "drm/virtio: send vblank event after crtc updates" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    drm/virtio: send vblank event after crtc updates

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    https://git.launchpad.net/~canonical-kernel/linux/+git/linux-stable-ckt/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt10.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From 900f5de68a7e5905172d98237747f8083f724551 Mon Sep 17 00:00:00 2001
From: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
Date: Thu, 14 Apr 2016 10:58:54 -0700
Subject: drm/virtio: send vblank event after crtc updates

commit 9a11d2e7e66b6b8764a2430686b8716637bf812e upstream.

virtio_gpu was failing to send vblank events when using the atomic IOCTL
with the DRM_MODE_PAGE_FLIP_EVENT flag set. This patch fixes each and
enables atomic pageflips updates.

Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
Signed-off-by: Dave Airlie <airlied at redhat.com>
[ kamal: backport to 4.2-stable: older crtc api ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/gpu/drm/virtio/virtgpu_display.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index 54b70f1..7f9e96d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -223,12 +223,23 @@ static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 	return 0;
 }

+static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&crtc->dev->event_lock, flags);
+	if (crtc->state->event)
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+}
+
 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
 	.enable        = virtio_gpu_crtc_enable,
 	.disable       = virtio_gpu_crtc_disable,
 	.mode_fixup    = virtio_gpu_crtc_mode_fixup,
 	.mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
 	.atomic_check  = virtio_gpu_crtc_atomic_check,
+	.atomic_flush  = virtio_gpu_crtc_atomic_flush,
 };

 static bool virtio_gpu_enc_mode_fixup(struct drm_encoder *encoder,
--
2.7.4