linux-kernel - Re: [PATCH v2] PCI: Add information about describing PCI in ACPI

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Date:   Thu, 01 Dec 2016 23:37:39 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>, Duc Dang <dhdang@....com>,
        linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
        linux-acpi@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Lv Zheng <lv.zheng@...el.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] PCI: Add information about describing PCI in ACPI

On Thursday, December 01, 2016 04:36:04 PM Bjorn Helgaas wrote:
> On Tue, Nov 29, 2016 at 03:39:48PM -0600, Bjorn Helgaas wrote:
> > Here's another stab at this writeup.  I'd appreciate any comments!
> > 
> > Changes from v1 to v2:
> >   - Consumer/Producer is defined for Extended Address Space descriptors;
> >     should be ignored for QWord/DWord/Word Address Space descriptors
> >   - New arches may use Extended Address Space descriptors in PNP0A03 for
> >     bridge registers, including ECAM (if the arch adds support for this)
> >   - Add more details about MCFG and _CBA (Lv's suggestion)
> >   - Incorporate Rafael's suggestions
> > 
> > ---
> > 
> > Bjorn Helgaas (1):
> >       PCI: Add information about describing PCI in ACPI
> > 
> > 
> >  Documentation/PCI/00-INDEX      |    2 
> >  Documentation/PCI/acpi-info.txt |  180 +++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 182 insertions(+)
> >  create mode 100644 Documentation/PCI/acpi-info.txt
> 
> It's very late in the cycle, but I'm considering trying to squeeze
> this into v4.9 on the grounds that:
> 
>   - It's only a documentation change and can't break anything, and
> 
>   - Distributing it more widely may help the arm64 firmware ecosystem
> 
> But I don't want to disseminate misleading or incorrect information,
> so if it needs clarification or wordsmithing, or even just maturation,
> I'll wait until v4.10.
> 
> The Consumer/Producer stuff, in particular, doesn't seem 100% settled
> yet.  Your thoughts, and especially your improvements, are welcome!

Well, what's the drawback if it doesn't go into 4.9?

Thanks,
Rafael