drm/i915: Make driver less chatty

Convert many printk calls to DRM_DEBUG calls to reduce kernel log noise
for normal activities. Switch other printk calls to DRM_ERROR or DRM_INFO.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 9564ca4..f65044b 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -252,14 +252,14 @@
 
 	/* Should never happen!! */
 	if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
-		printk(KERN_ERR "Can't support LVDS on pipe A\n");
+		DRM_ERROR("Can't support LVDS on pipe A\n");
 		return false;
 	}
 
 	/* Should never happen!! */
 	list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 		if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
-			printk(KERN_ERR "Can't enable LVDS and another "
+			DRM_ERROR("Can't enable LVDS and another "
 			       "encoder on the same pipe\n");
 			return false;
 		}