[Intel-gfx] [PATCH]i915: use msleep for intel_wait_for_vblank

[Shaohua Li]

20ms delay is quite big and the routine isn't called in atomic context.
better use msleep to let other tasks run. This can reduce cpu time used
by Xorg, so potentially boost boot.

Signed-off-by: Shaohua Li <shaohua.li at intel.com>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3ba6546..fbcda0c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -952,7 +952,7 @@ void
 intel_wait_for_vblank(struct drm_device *dev)
 {
 	/* Wait for 20ms, i.e. one cycle at 50hz. */
-	mdelay(20);
+	msleep(20);
 }
 
 /* Parameters have changed, update FBC info */