linux-kernel - Re: [PATCH] PCI: Remove not needed check in disable aspm link

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Message-ID: <CAE9FiQWPvOYK2W0VSRuMyfj9Edbw1BSp-W91HjPyszPK0ZBcjg@mail.gmail.com>
Date:	Fri, 14 Jun 2013 15:40:28 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Roman Yepishev <roman.yepishev@...il.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Jussi Kivilinna <jussi.kivilinna@....fi>
Subject: Re: [PATCH] PCI: Remove not needed check in disable aspm link

On Fri, Jun 14, 2013 at 3:27 PM, Matthew Garrett
<matthew.garrett@...ula.com> wrote:
> On Fri, 2013-06-14 at 15:17 -0700, Yinghai Lu wrote:
>
>> after those two patches, it aspm_disabled is set, via _osc early,
>> pre-1.1 devices aspm register will be touched even aspm_force is not specified.
>
> I don't follow. We were previously automatically disabling ASPM on
> pre-1.1 devices even if _OSC didn't give us control.

I don't think so, we just moved _OSC support/control setting before pci scan
in 3.8 and revert that in v3.9.

> I've confirmed that
> this was the wrong thing for us to be doing, and my patch changed the
> behaviour such that if the firmware enables ASPM on a pre-1.1 device and
> refuses to give us control via _OSC we will leave ASPM enabled.

not sure, aspm_disabled should be false on booting path when that function
is called, if you don't pass aspm=off.

Yinghai
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