linux-kernel - Re: [RFC PATCH 1/2] PCI/ACPI: Add ACPI support for non ECAM Host Bridge Controllers

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Message-ID: <566ADAEE.8020408@semihalf.com>
Date:	Fri, 11 Dec 2015 15:17:18 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	Gabriele Paoloni <gabriele.paoloni@...wei.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"will.deacon@....com" <will.deacon@....com>,
	Wangyijing <wangyijing@...wei.com>,
	"Wangzhou (B)" <wangzhou1@...ilicon.com>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"liudongdong (C)" <liudongdong3@...wei.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"xuwei (O)" <xuwei5@...ilicon.com>,
	"Liguozhu (Kenneth)" <liguozhu@...ilicon.com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>
Subject: Re: [RFC PATCH 1/2] PCI/ACPI: Add ACPI support for non ECAM Host
 Bridge Controllers

On 04.12.2015 17:22, Gabriele Paoloni wrote:
> Hi Lorenzo, Arnd (thanks to you both for looking at this)
>
>> -----Original Message-----
>> From: Arnd Bergmann [mailto:arnd@...db.de]
>> Sent: 04 December 2015 13:57
>> To: Lorenzo Pieralisi
>> Cc: linux-arm-kernel@...ts.infradead.org; Gabriele Paoloni; linux-
>> acpi@...r.kernel.org; linux-pci@...r.kernel.org;
>> catalin.marinas@....com; linaro-acpi@...ts.linaro.org;
>> Liviu.Dudau@....com; linux-kernel@...r.kernel.org; will.deacon@....com;
>> Wangyijing; Wangzhou (B); hanjun.guo@...aro.org; liudongdong (C);
>> tn@...ihalf.com; bhelgaas@...gle.com; tglx@...utronix.de; xuwei (O);
>> Liguozhu (Kenneth); jiang.liu@...ux.intel.com
>> Subject: Re: [RFC PATCH 1/2] PCI/ACPI: Add ACPI support for non ECAM
>> Host Bridge Controllers
>>
>> On Friday 04 December 2015 12:04:04 Lorenzo Pieralisi wrote:
>>> On Thu, Dec 03, 2015 at 09:58:14PM +0100, Arnd Bergmann wrote:
>>
>>>> pci-host-generic.c is just for standard PCI implementations, and it
>>>> has zero code that would be shared with ACPI: Most of the
>>>> implementation deals with parsing DT properties, and all that code
>>>> is entirely differnet for ACPI and already exists in drivers/acpi.
>>>> The one thing that could be shared is the ECAM config space access,
>>>> but ACPI already needs something else here because it requires
>>>> access to the config space at early boot time, way before we even
>> load that driver, see raw_pci_read/raw_pci_write.
>>>
>>> Yes, I agree, basically ACPI has already a concept of "host generic"
>>> layer, there is not much point in "merging" it with the
>>> pci-host-generic.c driver. One thing is for certain: nothing in this
>>> and Tomasz patchsets is
>>> arm64 specific, and should not live in arch/arm64.
>
> Ok so now I guess Tomasz is aware of this and probably he is reworking
> his patchset to move his code into "drivers/acpi/pci_*",
> Tomasz can you confirm this?

Yes, working on it now and sorry for late response.

Tomasz
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