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To: Jia Hongtao <B38951@freescale.com>
Cc: Scott Wood <scottwood@freescale.com>,
 Kumar Gala <galak@kernel.crashing.org>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Paul Mackerras <paulus@samba.org>,
 Michael Ellerman <mpe@ellerman.id.au>, linuxppc-dev@lists.ozlabs.org,
 "David Beazley (dbeazley)" <dbeazley@cisco.com>,
 "xe-kernel@external.cisco.com" <xe-kernel@external.cisco.com>
From: Daniel Walker <danielwa@cisco.com>
Subject: Re: powerpc/fsl-pci: Unify pci/pcie initialization code
Message-ID: <563BA46C.8000202@cisco.com>
Date: Thu, 5 Nov 2015 10:48:12 -0800
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Hi,

905e75c46dba5f3061049277e4eb7110beedba43:arch/powerpc/platforms/85xx/mpc85xx_ads.c

This commit seems to cause problems with PCI devices doing DMA, just 
with mpc85xx ads. If you do the "fsl_add_bridge()" after you setup the 
ppc_md.pci_exclude_device to mpc85xx_exclude_device, then the 
early_read_config_word() calls in 
arch/powerpc/sysdev/fsl_pci.c:setup_pci_cmd() are like no-ops.

This issue was found by David Beazley (on the CC), he can respond to 
more detailed questions on it. The fix he came up with was to remove the 
"pci_exclude_device".

Daniel