From: Scott Wood <scottwood@freescale.com>
Date: Fri, 8 Aug 2014 23:40:43 +0000 (-0500)
Subject: powerpc/64: Honor swiotlb limit in coherent allocations
X-Git-Tag: omap-for-v3.19/prcm-cleanup~114^2~22^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6397fc3fb05e73062b9790cfe2760e209ebd7b95;p=pandora-kernel.git

powerpc/64: Honor swiotlb limit in coherent allocations

FSL PCI cannot directly address the whole lower 4 GiB due to
conflicts with PCICSRBAR and outbound windows, and thus
max_direct_dma_addr is less than 4GiB.  Honor that limit in
dma_direct_alloc_coherent().

Note that setting the DMA mask to 31 bits is not an option, since many
PCI drivers would fail if we reject 32-bit DMA in dma_supported(), and
we have no control over the setting of coherent_dma_mask if
dma_supported() returns true.

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