linux-kernel - Re: [PATCH] PCI: Default PCIe ASPM control to on and require !EMBEDDED to disable

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Date:	Fri, 2 Jul 2010 16:13:46 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	lrodriguez@...eros.com, maximlevitsky@...il.com
Subject: Re: [PATCH] PCI: Default PCIe ASPM control to on and require
 !EMBEDDED to disable

On Tue, 22 Jun 2010 17:03:03 -0400
Matthew Garrett <mjg@...hat.com> wrote:

> The CONFIG_PCIEASPM option is confusing and potentially dangerous. ASPM is
> a hardware mediated feature rather than one under direct OS control, and
> even if the config option is disabled the system firmware may have turned
> on ASPM on various bits of hardware. This can cause problems later -
> various hardware that claims to support ASPM does a poor job of it and may
> hang or cause other difficulties. The kernel is able to recognise this in
> many cases and disable the ASPM functionality, but only if CONFIG_PCIEASPM
> is enabled.
> 
> Given that in its default configuration this option will either leave the
> hardware as it was originally or disable hardware functionality that may
> cause problems, it should by default y. The only reason to disable it
> ought to be to reduce code size, so make it dependent on CONFIG_EMBEDDED.
> 
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
> Cc: lrodriguez@...eros.com
> Cc: maximlevitsky@...il.com
> ---
>  drivers/pci/pcie/Kconfig |   20 ++++++++++++++------
>  1 files changed, 14 insertions(+), 6 deletions(-)
> 

Applied to my linux-next branch, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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