We only have sufficient information for accurate (sub-frame) timestamping
when the modesetting is under our control.
Reported-by: Chris Clayton <chris2553 at googlemail.com>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 59eb19b..66796bb 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);
}
--
1.7.2.3
