i.MX: shut down video before launch of O/S

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>

arch/arm/cpu/armv7/imx-common/cpu.c

@@ -30,6 +30,7 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/crm_regs.h>
+#include <ipu_pixfmt.h>
 
 #ifdef CONFIG_FSL_ESDHC
 #include <fsl_esdhc.h>
@@ -140,3 +141,11 @@ u32 get_ahb_clk(void)
 
 	return get_periph_clk() / (ahb_podf + 1);
 }
+
+#if defined(CONFIG_VIDEO_IPUV3)
+void arch_preboot_os(void)
+{
+	/* disable video before launching O/S */
+	ipuv3_fb_shutdown();
+}
+#endif