drm/i915: Make GMBUS timeout message DRM_DEBUG_KMS

There's no real reason the user should care that we're about to fall
back to bitbanging, so let's change the message from DRM_INFO to
DRM_DEBUG_KMS.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457366220-29409-5-git-send-email-ville.syrjala@linux.intel.com
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94890
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_i2c.c

@@ -571,8 +571,8 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
 	goto out;
 
 timeout:
-	DRM_INFO("GMBUS [%s] timed out, falling back to bit banging on pin %d\n",
-		 bus->adapter.name, bus->reg0 & 0xff);
+	DRM_DEBUG_KMS("GMBUS [%s] timed out, falling back to bit banging on pin %d\n",
+		      bus->adapter.name, bus->reg0 & 0xff);
 	I915_WRITE(GMBUS0, 0);
 
 	/*