From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261629AbVADPIL (ORCPT ); Tue, 4 Jan 2005 10:08:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261670AbVADPIL (ORCPT ); Tue, 4 Jan 2005 10:08:11 -0500 Received: from news.suse.de ([195.135.220.2]:24990 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S261629AbVADPIG (ORCPT ); Tue, 4 Jan 2005 10:08:06 -0500 Date: Tue, 04 Jan 2005 16:08:05 +0100 Message-ID: From: Takashi Iwai To: Liam Girdwood Cc: Alan Cox , Jeff Garzik , lkml Subject: Re: [PATCH] AC97 support for low power codecs In-Reply-To: <1104838450.9143.81.camel@cearnarfon> References: <1104838450.9143.81.camel@cearnarfon> User-Agent: Wanderlust/2.10.1 (Watching The Wheels) SEMI/1.14.5 (Awara-Onsen) FLIM/1.14.5 (Demachiyanagi) APEL/10.6 MULE XEmacs/21.4 (patch 15) (Security Through Obscurity) (i386-suse-linux) MIME-Version: 1.0 (generated by SEMI 1.14.5 - "Awara-Onsen") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org At Tue, 04 Jan 2005 11:34:10 +0000, Liam Girdwood wrote: > > I've attached a patch against 2.6.10 that checks the codec ID before > doing an AC97 register reset. This allows the kernel to support low > power codecs that are powered down by a reset command. This patch also > fixes some other minor issues. Does writing RESET on such a codec must be avoided always? Or can one power up again by writing some values on POWER register? Takashi