ARM: mach-shmobile: mackerel: Reserve DMA memory for the frame buffer

The default 2MB size of DMA coherent memory isn't enough for allocate
frame buffer memory.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/arm/mach-shmobile/board-mackerel.c

@@ -1352,6 +1352,10 @@ static struct map_desc mackerel_io_desc[] __initdata = {
 static void __init mackerel_map_io(void)
 {
 	iotable_init(mackerel_io_desc, ARRAY_SIZE(mackerel_io_desc));
+	/* DMA memory at 0xff200000 - 0xffdfffff. The default 2MB size isn't
+	 * enough to allocate the frame buffer memory.
+	 */
+	init_consistent_dma_size(12 << 20);
 
 	/* setup early devices and console here as well */
 	sh7372_add_early_devices();