drm/i915: s/mdelay/msleep/

Burning cpu cycles isn't awesome, so use sleeps instead.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -1026,7 +1026,7 @@ static bool pipe_dsl_stopped(struct drm_device *dev, enum pipe pipe)
 		line_mask = DSL_LINEMASK_GEN3;
 
 	line1 = I915_READ(reg) & line_mask;
-	mdelay(5);
+	msleep(5);
 	line2 = I915_READ(reg) & line_mask;
 
 	return line1 == line2;

drivers/gpu/drm/i915/intel_pm.c

@@ -4255,7 +4255,7 @@ static void ironlake_enable_drps(struct drm_device *dev)
 
 	if (wait_for_atomic((I915_READ(MEMSWCTL) & MEMCTL_CMD_STS) == 0, 10))
 		DRM_ERROR("stuck trying to change perf mode\n");
-	mdelay(1);
+	msleep(1);
 
 	ironlake_set_drps(dev, fstart);
 
@@ -4286,10 +4286,10 @@ static void ironlake_disable_drps(struct drm_device *dev)
 
 	/* Go back to the starting frequency */
 	ironlake_set_drps(dev, dev_priv->ips.fstart);
-	mdelay(1);
+	msleep(1);
 	rgvswctl |= MEMCTL_CMD_STS;
 	I915_WRITE(MEMSWCTL, rgvswctl);
-	mdelay(1);
+	msleep(1);
 
 	spin_unlock_irq(&mchdev_lock);
 }