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

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Message-ID: <52318CCC.4040604@ti.com>
Date:	Thu, 12 Sep 2013 15:13:40 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Pratyush Anand <pratyush.anand@...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,

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?

Thanks
Kishon
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