From e96ab5a0ecb1b0ab6ce67c702d929064312609b1 Mon Sep 17 00:00:00 2001
From: rnoland <rnoland@FreeBSD.org>
Date: Thu, 25 Jun 2009 15:47:32 +0000
Subject: Keep track of the hardware counter more aggressively while interrupts
 are enabled.  This should help to reduce cases where the hardware counter
 reference jumps by large amounts.

MFC after:	3 days
---
 sys/dev/drm/drm_irq.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'sys/dev/drm')

diff --git a/sys/dev/drm/drm_irq.c b/sys/dev/drm/drm_irq.c
index be513e2..4c1f865 100644
--- a/sys/dev/drm/drm_irq.c
+++ b/sys/dev/drm/drm_irq.c
@@ -325,6 +325,10 @@ int drm_vblank_get(struct drm_device *dev, int crtc)
 		}
 	}
 
+	if (dev->vblank[crtc].enabled)
+		dev->vblank[crtc].last =
+		    dev->driver->get_vblank_counter(dev, crtc);
+
 	return ret;
 }
 
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