Take advantage of the kernel flush for dirty bo in the busy ioctl

Rather than just creating and submitting a batch that simply contains a
flush in order to periodically ensure that rendering reaches the
scanout, we can simply ask the kernel whether the scanout is busy. The
kernel will then submit a flush on our behalf if it is dirty, which
takes advantage of the kernel's dirty state tracking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit 6f104189bb9439ab0e05f04d4be020813eb04bf9)

Conflicts:

	src/intel_display.c
	src/intel_driver.c

0 files changed, 0 insertions, 0 deletions