linux-kernel - [PATCH v2] drm/virtio: send vblank event after crtc updates

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Message-Id: <1458677872-6024-1-git-send-email-gustavo@padovan.org>
Date:	Tue, 22 Mar 2016 17:17:52 -0300
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org (open list:VIRTIO GPU DRIVER),
	virtualization@...ts.linux-foundation.org (open list:VIRTIO GPU DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] drm/virtio: send vblank event after crtc updates

From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>

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@...labora.co.uk>
---
 drivers/gpu/drm/virtio/virtgpu_display.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index b70bb8b..4f372e0 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -274,12 +274,24 @@ static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 	return 0;
 }
 
+static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
+					 struct drm_crtc_state *old_state)
+{
+	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 void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
-- 
2.5.0