linux-kernel - Re: ehci-hcd affects hda speed

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Date:	Thu, 17 Apr 2008 10:20:11 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	"Lev A. Melnikovsky" <melnikovsky@...l.ru>
Cc:	Rene Herman <rene.herman@...access.nl>,
	Alessandro Suardi <alessandro.suardi@...il.com>,
	David Brownell <david-b@...bell.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: ehci-hcd affects hda speed

Am Donnerstag, 17. April 2008 00:23:08 schrieb Lev A. Melnikovsky:
> Oliver,
> 
> ON> EHCI should not scan an empty async. However this manufacturer
> ON> has shown a liberal attitude about conforming with specifications.
> ON> If the root hub is suspended, it can't do DMA. So it might help.
> Yes, it does, thank you. No DMA when suspended. Auto-suspend is executed 
> if external hub is the only attached device. Can this be used to block 
> spurious schedule traversal?

Obviously, yes, if only hubs are attached. The question is whether it
should be. It would be better to find a way to fix the chip bug in the active
state. However, as fixing all hardware bugs for that vendor may be difficult
I wanted to test whether a partial work around is available.

	Regards
		Oliver
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