linux-kernel - Re: [PATCH V3] pci: exynos: split into two parts such as Synopsys part and Exynos part

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Message-ID: <20130912095213.GA5995@pratyush-vbox>
Date:	Thu, 12 Sep 2013 15:22:13 +0530
From:	Pratyush Anand <pratyush.anand@...com>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Jingoo Han <jg1.han@...sung.com>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	Mohit KUMAR DCG <Mohit.KUMAR@...com>,
	'Arnd Bergmann' <arnd@...db.de>,
	'Sean Cross' <xobs@...agi.com>,
	'Thierry Reding' <thierry.reding@...il.com>,
	'SRIKANTH TUMKUR SHIVANAND' <ts.srikanth@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH V3] pci: exynos: split into two parts such as Synopsys
 part and Exynos part

Hi Kishon,

On Thu, Sep 12, 2013 at 05:43:40PM +0800, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Thursday 12 September 2013 03:00 PM, Pratyush Anand wrote:
> > Hi Jingoo,
> > 
> > 
> > On Thu, Sep 12, 2013 at 03:15:04PM +0800, Jingoo Han wrote:
> >> On Tuesday 23 July 2013 12:30 PM, Kishon Vijay Abraham I wrote:
> >>>>> .
> >>>>> .
> >>>>>>>> +			of_pci_range_to_resource(&range, np, &pp->cfg);
> >>>>>>>> +			pp->config.cfg0_size = resource_size(&pp->cfg)/2;
> >>>>>>>> +			pp->config.cfg1_size = resource_size(&pp->cfg)/2;
> >>>>>>>> +		}
> >>>>>>>> +	}
> >>>>>>>> +
> >>>>>>>> +	pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
> >>>>>>>> +				resource_size(&pp->cfg));
> >>>>>>>
> >>>>>>> Why is configuraion space divided into two?
> >>>>>>
> >>>>>> Sorry, I don't know the exact reason. :(
> >>>>>> Pratyush Anand may know about this.
> >>>>>> Pratyush Anand, could you answer the question?
> >>>>>>
> >>>>>> Also, if you find some problems, please let me know.
> >>>
> >>> One more query..
> >>>
> >>> Where is inbound translation configuration done in your driver? how should it
> >>> be done?
> >>
> > 
> > Yes, Kishon is right. Inbound translation configuration is missing in
> > your code and I think it should be implemented.
> > 
> >> Hi Kishon,
> >>
> >> Sorry, I cannot understand your question exactly.
> >> However, the following thread would be helpful.
> >>
> >> http://www.spinics.net/lists/arm-kernel/msg252078.html
> >> https://lkml.org/lkml/2013/6/17/890
> > 
> > From this conversation, It seems that you
> > have tested this driver and it works fine without inbound translation
> > function. I am sure that you would have tested a PCIe card with DMA
> > capability such as PCIe2USB or PCIe2Ethernet. Since it worked, it
> > means that by default your controller is supporting one to one mapping
> > in case of inbound transaction even when address translation is enabled.
> 
> btw, I'm testing Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168B PCI Express Gigabit Ethernet controller.
> 
> when I do ifconfig eth0 up, I get *r8169 0000:01:00.0 eth0: link up.*
> But I dont receive any packets and ping also fails and the tx and rx packet
> count is also 0. Could it be related to inbound translation?

A PCIe analyser log would tell a definite cause. Most likely either
inbound translation is not working or INTx/MSI is not working.

Regards
Pratyush

> 
> Thanks
> Kishon
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