From 84f44cc56c0994df7778bde55c8d5e9aa9fff8f5 Mon Sep 17 00:00:00 2001
From: Scott Wood <scottwood@freescale.com>
Date: Fri, 8 Aug 2014 18:40:45 -0500
Subject: [PATCH] powerpc/fsl-pci: Limit ZONE_DMA32 to 2GiB on 64-bit platforms

FSL PCI cannot directly address the whole lower 4 GiB due to
conflicts with PCICSRBAR and outbound windows.  By the time
max_direct_dma_addr is set to the precise limit, it will be too late to
alter the zone limits, but we should always have at least 2 GiB mapped
(unless RAM is smaller than that).

Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Shaohui Xie <Shaohui.Xie@freescale.com>
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