drm/exynos: control dvi mode via a kernel parameter

Change-Id: I11898db158dc0594c8b5e16a5b95b6f8db5853e9

drivers/gpu/drm/exynos/exynos_hdmi.c

@@ -219,6 +219,26 @@ struct hdmiphy_config {
 };
 
 #if defined(CONFIG_MACH_ODROIDXU3)
+//-----------------------------------------------------------------------------
+//  DVI Control (defaults to hdmi always).
+//
+//-----------------------------------------------------------------------------
+unsigned int gdvi_mode = false;
+
+static int __init dvi_force_enable(char *l)
+{
+	if(!strcmp(l, "dvi")) {
+		gdvi_mode = true;
+		pr_emerg("hdmi: using DVI Mode\n");
+	} else {
+		gdvi_mode = false;
+		pr_emerg("hdmi: using HDMI Mode\n");
+	}
+	
+	return 0;
+}
+__setup("vout=", dvi_force_enable);
+
 //-----------------------------------------------------------------------------
 //
 //  HPD Signal Disable control.
@@ -1335,6 +1355,8 @@ static int hdmi_get_modes(struct drm_connector *connector)
 		return -ENODEV;
 
 	hdata->dvi_mode = !drm_detect_hdmi_monitor(edid);
+	hdata->dvi_mode = gdvi_mode;
+
 	DRM_DEBUG_KMS("%s : width[%d] x height[%d]\n",
 		(hdata->dvi_mode ? "dvi monitor" : "hdmi monitor"),
 		edid->width_cm, edid->height_cm);