drm/i915: Can't do accurate vblank timestamps with UMS



Disable this feature when KMS is not running by setting the
driver->get_vblank_timestamp function pointer to NULL.

Signed-off-by: Keith Packard <keithp@keithp.com>
Tested-by: Justin P. Mattock <justinmattock@gmail.com>

parent aaa6fd2a

drivers/gpu/drm/i915/i915_irq.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -2058,8 +2058,10 @@ void intel_irq_init(struct drm_device *dev)
		dev->driver->get_vblank_counter = gm45_get_vblank_counter;
		}


		if (drm_core_check_feature(dev, DRIVER_MODESET))
		dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
		else
		dev->driver->get_vblank_timestamp = NULL;
		dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;

		if (IS_IVYBRIDGE(dev)) {