From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757537AbYDQILc (ORCPT ); Thu, 17 Apr 2008 04:11:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753353AbYDQILV (ORCPT ); Thu, 17 Apr 2008 04:11:21 -0400 Received: from smtp-out002.kontent.com ([81.88.40.216]:51098 "EHLO smtp-out002.kontent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752493AbYDQILT (ORCPT ); Thu, 17 Apr 2008 04:11:19 -0400 From: Oliver Neukum Organization: Novell To: "Lev A. Melnikovsky" Subject: Re: ehci-hcd affects hda speed Date: Thu, 17 Apr 2008 10:20:11 +0200 User-Agent: KMail/1.9.6 (enterprise 20070904.708012) Cc: Rene Herman , Alessandro Suardi , David Brownell , Linux Kernel References: <200804160738.13437.oliver@neukum.org> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200804171020.14189.oliver@neukum.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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