linux-kernel - Re: [PATCH v2 0/2] PCI: designware: improve iATU programming and usage

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Message-ID: <20150519230532.GV31666@google.com>
Date:	Tue, 19 May 2015 18:05:32 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jisheng Zhang <jszhang@...vell.com>
Cc:	jg1.han@...sung.com, Minghuan.Lian@...escale.com,
	fabrice.gasnier@...com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Mohit Kumar <mohit.kumar@...com>
Subject: Re: [PATCH v2 0/2] PCI: designware: improve iATU programming and
 usage

[+cc Mohit]

On Thu, Apr 30, 2015 at 04:22:27PM +0800, Jisheng Zhang wrote:
> The outbound iATU programming functions are similar, so PATCH1 consolidates
> them into one.
> 
> Most transactions' type are cfg0 and MEM, so current iATU usage is not
> balanced. PATCH2 adopts idea from Minghuan Lian <Minghuan.Lian@...escale.com>:
> 
>  http://www.spinics.net/lists/linux-pci/msg40440.html
> 
> to change the iATU allocation: iATU0 for cfg and IO, iATU1 for MEM.
> 
> Changes since v1:
> - remove outbound iATU programming for IO in dw_pcie_host_init, since it can
>   be done by berlin_pcie_{rd|wr}_other_conf() latter.
> - only do outbound iATU programming for MEM if pp->ops->rd_other_conf is not
>   set. Thank Fabrice Gasnier to point out "some platforms doesn't have support
>   for ATU"
> 
> Jisheng Zhang (2):
>   PCI: designware: consolidate outbound iATU programming functions
>   PCI: designware: use iATU0 for cfg and IO, iATU1 for MEM
> 
>  drivers/pci/host/pcie-designware.c | 142 ++++++++++++++++---------------------

These need acks from Jingoo and/or Mohit.  Any opinions?

Bjorn
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