drm/i915/hdmi: fix vlv infoframe port check

Due to missing shifting, the vlv infoframe port check only works for
port A. Fix it. Broken since introduction in

commit 535afa2
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Wed Apr 15 16:52:29 2015 -0700

    drm/i915/vlv: check port in infoframe_enabled v2

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90059
Tested-by: xubin <bin.a.xu@intel.com>
Tested-by: Ye Tian <yex.tian@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_hdmi.c

@@ -327,9 +327,8 @@ static bool vlv_infoframe_enabled(struct drm_encoder *encoder)
 	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
 	int reg = VLV_TVIDEO_DIP_CTL(intel_crtc->pipe);
 	u32 val = I915_READ(reg);
-	u32 port = intel_dig_port->port;
 
-	if (port == (val & VIDEO_DIP_PORT_MASK))
+	if (VIDEO_DIP_PORT(intel_dig_port->port) == (val & VIDEO_DIP_PORT_MASK))
 		return val & VIDEO_DIP_ENABLE;
 
 	return false;