mx6sabre_common: Dynamically change the video output

Use the 'hdmidetect' command in U-boot to load the appropriate
video arguments. If HDMI is connected during boot then make HDMI
as the primary framebuffer, otherwise let LVDS be the primary framebuffer.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

configs/mx6sabreauto_defconfig

@@ -14,6 +14,7 @@ CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_SPL=y
 CONFIG_SPL_LIBDISK_SUPPORT=y
+CONFIG_CMD_HDMIDETECT=y
 CONFIG_NXP_BOARD_REVISION=y
 CONFIG_SPL_TEXT_BASE=0x00908000
 CONFIG_FIT=y

configs/mx6sabresd_defconfig

@@ -15,6 +15,7 @@ CONFIG_NR_DRAM_BANKS=1
 CONFIG_SPL=y
 CONFIG_SPL_LIBDISK_SUPPORT=y
 CONFIG_SPL_TEXT_BASE=0x00908000
+CONFIG_CMD_HDMIDETECT=y
 CONFIG_FIT=y
 CONFIG_SPL_FIT_PRINT=y
 CONFIG_SPL_LOAD_FIT=y

include/configs/mx6sabre_common.h

@@ -40,13 +40,15 @@
 #define EMMC_ENV ""
 #endif
 
-#ifndef VIDEO_ARGS
-#define VIDEO_ARGS ""
-#endif
+#define VIDEO_ARGS        "${video_args}"
+#define VIDEO_ARGS_SCRIPT "run video_args_script; "
 
-#ifndef VIDEO_ARGS_SCRIPT
-#define VIDEO_ARGS_SCRIPT ""
-#endif
+#define CONFIG_PREBOOT \
+	"if hdmidet; then " \
+		"setenv video_interfaces hdmi lvds; " \
+	"else " \
+		"setenv video_interfaces lvds hdmi; " \
+	"fi;"
 
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"script=boot.scr\0" \
@@ -87,7 +89,6 @@
 	"video_args_lcd=setenv video_args $video_args " \
 		"video=mxcfb${fb}:dev=lcd,CLAA-WVGA,if=RGB666\0" \
 	"fb=0\0" \
-	"video_interfaces=hdmi lvds lcd\0" \
 	"video_args_script=" \
 		"for v in ${video_interfaces}; do " \
 			"run video_args_${v}; " \

include/configs/mx6sabresd.h

@@ -16,9 +16,6 @@
 #define CONFIG_MXC_UART_BASE	UART1_BASE
 #define CONSOLE_DEV		"ttymxc0"
 
-#define VIDEO_ARGS        "${video_args}"
-#define VIDEO_ARGS_SCRIPT "run video_args_script; "
-
 #include "mx6sabre_common.h"
 
 /* Falcon Mode */