linux-kernel - Re: [Linaro-acpi] [RFC part1 PATCH 1/7] ACPI: Make ACPI core running without PCI on ARM64

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Date:	Tue, 10 Dec 2013 10:53:20 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>
CC:	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"patches@...aro.org" <patches@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Linaro-acpi] [RFC part1 PATCH 1/7] ACPI: Make ACPI core running
 without PCI on ARM64

On 2013-12-10 0:55, Catalin Marinas wrote:
> On Mon, Dec 09, 2013 at 04:35:04PM +0000, Arnd Bergmann wrote:
>> On Monday 09 December 2013, Hanjun Guo wrote:
>>> On 2013-12-9 19:50, Catalin Marinas wrote:
>>>> On Mon, Dec 09, 2013 at 04:12:24AM +0000, Hanjun Guo wrote:
>>>>>
>>>>> I think the concern here is that ACPI is only for server platform or not.
>>>>>
>>>>> Since ACPI has lots of content related to power management, I think ACPI
>>>>> can be used for mobile devices and other platform too, not only for ARM
>>>>> servers, and with this patch, we can support both requirement.
>>>>
>>>> 'Can be used' is one thing, will it really be used is another? I don't
>>>> think so, it was (well, is) difficult enough to make the transition to
>>>> FDT, I don't see how ACPI would solve the current issues.
>>
>> Exactly. In particular we don't want people to get the wrong idea about
>> where we are heading, so making it possible to use this code on embedded
>> systems for me is a reason *not* to take the patch.
> 
> I agree.
> 
>>>> I see ACPI as a server distro requirement and there are indeed benefits
>>>> in abstracting the hardware behind standard description, AML. Of course,
>>>> this would work even better with probe-able buses like PCIe and I'm
>>>> pretty sure this would be the case on high-end servers. But even if a
>>>> server distro like RHEL supports a SoC without PCIe, I would expect them
>>>> to only provide a single binary Image with CONFIG_PCI enabled.
>>>>
>>>> This patch is small enough and allows ACPI build with !CONFIG_PCI for
>>>> the time being but longer term I would expect such SoCs without PCI to
>>>> be able to run on a kernel with CONFIG_PCI enabled.
>>>
>>> Yes, we will support PCI in ACPI in the long run, and we just make PCI
>>> optional for ACPI in this patch.
>>
>> Do you mean there is a problem running your code with PCI /enabled/ at the
>> moment? If so, I'd suggest fixing that instead since you will have to fix
>> it anyway.
> 
> CONFIG_PCI does not exist on arm64 yet (we have some internal patches
> but may not be ready to be posted before the holidays; they try to share
> code with other archs, so more discussions before merging). We could add
> CONFIG_PCI and some dummy functions on arm64 for development (not to be
> upstreamed) or Hanjun could continue to use the current patch before we
> get PCI working. 

Thanks for the suggestion, I will continue to use the current patch, and
I will rework or rebase this one when PCI is working.

Hanjun

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