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

From: Bjorn Helgaas
Date: Tue May 19 2015 - 19:05:44 EST


[+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@xxxxxxxxxxxxx>:
>
> 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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