drivers/intel/gma: Export Read_EDID() to C

Change-Id: Icf802904c569e621ca3b3105b6107936776c5cee
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31458
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/intel/gma/libgfxinit.h

@@ -14,6 +14,19 @@
 #ifndef DRIVERS_INTEL_GMA_LIBGFXINIT_H
 #define DRIVERS_INTEL_GMA_LIBGFXINIT_H
 
+enum {
+	GMA_PORT_DISABLED,
+	GMA_PORT_INTERNAL,
+	GMA_PORT_DP1,
+	GMA_PORT_DP2,
+	GMA_PORT_DP3,
+	GMA_PORT_HDMI1,	/* or DVI */
+	GMA_PORT_HDMI2,	/* or DVI */
+	GMA_PORT_HDMI3,	/* or DVI */
+	GMA_PORT_ANALOG,
+};
+
 void gma_gfxinit(int *lightup_ok);
+int gma_read_edid(unsigned char edid[], int port);
 
 #endif