linux-kernel - Re: [PATCH 4/5] PCI: designware: Add setup bus-related to pcie_host

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Date:	Mon, 19 Jan 2015 14:09:43 +0100
From:	Gabriel Fernandez <gabriel.fernandez@...aro.org>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	Gabriel FERNANDEZ <gabriel.fernandez@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Russell King <linux@....linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mohit Kumar <mohit.kumar@...com>,
	Grant Likely <grant.likely@...aro.org>,
	Fabrice Gasnier <fabrice.gasnier@...com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Thierry Reding <treding@...dia.com>,
	Minghuan Lian <Minghuan.Lian@...escale.com>,
	Magnus Damm <damm@...nsource.se>,
	Will Deacon <will.deacon@....com>,
	Tanmay Inamdar <tinamdar@....com>,
	Murali Karicheri <m-karicheri2@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Pratyush Anand <pratyush.anand@...com>,
	Sachin Kamat <sachin.kamat@...sung.com>,
	Andrew Lunn <andrew@...n.ch>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...inux.com" <kernel@...inux.com>,
	linux-pci@...r.kernel.org, Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 4/5] PCI: designware: Add setup bus-related to pcie_host_ops

Hi Arnd, Jingoo,

On 18 December 2014 at 05:58, Jingoo Han <jg1.han@...sung.com> wrote:
> On Thursday, December 18, 2014 7:16 AM, Arnd Bergmann wrote:
>> On Wednesday 17 December 2014 11:34:45 Gabriel FERNANDEZ wrote:
>> > ST sti SoCs PCIe IPs are built around DesignWare IP Core.
>> > But in these SoCs PCIe IP doesn't support IO.
>
> Hi Gabriel,
>
> I cannot understand how ST sti SoCs PCIe IP does not support I/O.
> As far as I know, it cannot be selected by the 'parameter'.
> Then, H/W engineers dropped out the I/O control logic?
>
>> >
>> > To support this, add setup_bus() to pcie_host_ops.
>
>
>> >
>> > Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
>> > Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...aro.org>
>>
>> The dw-pcie driver should be able to tell whether the device has
>> an I/O space or not, and do the right thing based on that. Don't
>> add an implementation specific callback for that.
>
> I agree with Arnd's opinion.
>
> In addition, I have one more question.
> Then, if a device that requires I/O region is connected to
> PCIe slot of ST sti SoCs PCIe, what will happen?
> It just prints error messages?
>
> Best regards,
> Jingoo Han
>
>>
>>       Arnd
>

Arnd in other post mention to add an empty I/O space to workaround
lack of I/O port access.
Is it the right thing to do ?
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-November/299623.html

Best regards
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