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

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Date:	Thu, 12 Sep 2013 16:16:02 +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

On Thu, Sep 12, 2013 at 03:48:03PM +0530, Pratyush Anand wrote:
> On Thu, Sep 12, 2013 at 06:07:23PM +0800, Kishon Vijay Abraham I wrote:
> > Hi,
> > 
> > On Thursday 12 September 2013 03:22 PM, Pratyush Anand wrote:
> > > 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:
> > >>>>>>> .
> > >>>>>>> .
> 
> [...]
> 
> > >> 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.
> > 
> > I have enabled only legacy interrupts. Whenever I connect or disconnect
> > ethernet cable I get link up/link down message and also the interrupt count for
> > eth0 increases. So I'm not doubting INTx interrupts as such.

Just a question, what is the MRRS of your RC? if it is 128, can you
try with passing pci=pcie_bus_peer2peer  in your bootargs.

Again, analyser will help a lot in diagnosing such issues.

Regards
Pratyush
> > 
> > btw configuring inbound translation once in dw_pcie_host_init enough is it? I
> > mean we use the same registers for configuring outbound translation also no? So
> > doesn't the inbound configuration gets lost?
> 
> No, you write at the same register, but you program direction as
> inbound. There are different resources for each viewport in inbound
> and outbound direction.
> 
> Regards
> Pratyush
> 
> > 
> > Thanks
> > Kishon
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