From mboxrd@z Thu Jan  1 00:00:00 1970
From: Qianyu Gong <qianyu.gong@nxp.com>
Date: Thu, 28 Jan 2016 08:55:34 +0000
Subject: [U-Boot] [PATCH] pci: gate print info of reading vender id with
 CONFIG_DM_PCI
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> -----Original Message-----
> From: Bin Meng [mailto:bmeng.cn at gmail.com]
> Sent: Thursday, January 28, 2016 4:02 PM
> To: Qianyu Gong <qianyu.gong@nxp.com>
> Cc: u-boot at lists.denx.de
> Subject: Re: [U-Boot] [PATCH] pci: gate print info of reading vender id with
> CONFIG_DM_PCI
> 
> On Thu, Jan 28, 2016 at 3:43 PM, Qianyu Gong <qianyu.gong@nxp.com> wrote:
> > Hi,
> >
> >> -----Original Message-----
> >> From: Bin Meng [mailto:bmeng.cn at gmail.com]
> >> Sent: Thursday, January 28, 2016 3:30 PM
> >> To: Qianyu Gong <qianyu.gong@nxp.com>
> >> Cc: U-Boot Mailing List <u-boot@lists.denx.de>
> >> Subject: Re: [U-Boot] [PATCH] pci: gate print info of reading vender
> >> id with CONFIG_DM_PCI
> >>
> >> On Thu, Jan 28, 2016 at 3:15 PM, Gong Qianyu <Qianyu.Gong@nxp.com> wrote:
> >> > From: Mingkai Hu <Mingkai.Hu@freescale.com>
> >> >
> >> > Referring to 'commit ff3e077bd23c ("dm: pci: Add a uclass for PCI")'.
> >> >
> >> > For legacy PCIe driver, it needs loop to read the vender_id from
> >> > devie
> >> > 0 to devie 255 to check if there is device available.
> >> > Reading non-existen device will trigger the "Cannot read bus
> >> > configuration: -1" information.
> >> >
> >> > Signed-off-by: Mingkai Hu <Mingkai.Hu@freescale.com>
> >> > Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
> >> > ---
> >>
> >> Which pci controller are you testing?
> >>
> >> [snip]
> >>
> >> Regards,
> >> Bin
> >
> > Designware PCIe controller on LS2085A.
> >
> 
> Please check commit 7ba34ff09f1ef105521f914e4ad4e4ac19975bac "pci:
> layerscape: Adjust the return value when ls_pcie_addr_valid() fails"
> which is already in mainline.
> 
> Regards,
> Bin

Ok. That's nice of you. 
And we also find another commit cab24b3407189a12 "dm: pci: Convert 'pci' 
command to driver model" submitted by Simon has fixed the issue. So no 
need of this patch.
Thanks a lot.

Regards,
Qianyu