linux-kernel - Re: [ath5k-devel] [PATCH v3] ath5k: disable ASPM

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Message-ID: <AANLkTikkN4qZefACF+piz-a4sdABd85rYUbjQG295u4L@mail.gmail.com>
Date:	Wed, 28 Jul 2010 17:06:36 -0700
From:	"Luis R. Rodriguez" <mcgrof@...il.com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	"ath5k-devel@...ts.ath5k.org" <ath5k-devel@...ts.ath5k.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	David Quan <David.Quan@...eros.com>,
	"Luis R. Rodriguez" <mcgrof@...badil.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"kernel-team@...ts.ubuntu.com" <kernel-team@...ts.ubuntu.com>,
	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	Jussi Kivilinna <jussi.kivilinna@...et.fi>,
	"tim.gardner@...onical.com" <tim.gardner@...onical.com>
Subject: Re: [ath5k-devel] [PATCH v3] ath5k: disable ASPM

On Wed, Jul 28, 2010 at 4:48 PM, Maxim Levitsky <maximlevitsky@...il.com> wrote:
> On Tue, 2010-07-27 at 08:57 -0700, Luis R. Rodriguez wrote:
>> On Tue, Jul 27, 2010 at 2:35 AM, Maxim Levitsky <maximlevitsky@...il.com> wrote:
>> > On Mon, 2010-07-26 at 23:50 +0100, Matthew Garrett wrote:
>> >> On Mon, Jul 26, 2010 at 03:43:04PM -0700, Luis R. Rodriguez wrote:
>> >>
>> >> > I see.. thanks Mathew... in that case since L1 works on all devices we
>> >> > could just force enable L1 for all PCIE devices. What do you think?
>> >>
>> >> Works for me.
>> >>
>> >
>> > On the second thought, there is no 'pci_enable_link_state' :-)
>> > I afraid that if I add it, I might not do that right for all cases, thus
>> > do more harm that good...
>>
>> I'm sorry, can you elaborate?
>
> I mean ASPM code doesn't have a function to undo effects of the
> blacklist (due to pre 1.1 pcie device).
>
> Its not that simple to write such function.

Ah good catch... pcie_aspm_sanity_check() will actually be used to
adjust the device link capability... So even if we do try to insist it
wouldn't work. I'm happy if we deal with this separately, its a
reasonable compromise to fix issues with existing devices out there.

  Luis
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