From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 23 Jan 2011 10:45:14 +0000 (+0000)
Subject: drm/i915: Disable high-precision vblank timestamping for UMS
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3885c6bbd0c6c9cc3c8e6d4f723abc87c593b07a;p=linux-beck.git

drm/i915: Disable high-precision vblank timestamping for UMS

We only have sufficient information for accurate (sub-frame) timestamping
when the modesetting is under our control.

Reported-by: Chris Clayton <chris2553@googlemail.com>
Tested-by: Chris Clayton <chris2553@googlemail.com>
Reviewed-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 59eb19b13b3f..66796bb82d3e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -752,6 +752,9 @@ static int __init i915_init(void)
 		driver.driver_features &= ~DRIVER_MODESET;
 #endif
 
+	if (!(driver.driver_features & DRIVER_MODESET))
+		driver.get_vblank_timestamp = NULL;
+
 	return drm_init(&driver);
 }