From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [PATCH 4/7] ASoC: Automatically calculate clock ratio for WM8580 Date: Mon, 16 Aug 2010 16:19:58 +0100 Message-ID: <20100816151958.GE3276@rakim.wolfsonmicro.main> References: <20100813193305.GB3778@sirena.org.uk> <1281728107-25386-4-git-send-email-broonie@opensource.wolfsonmicro.com> <20100815110924.GA25723@opensource.wolfsonmicro.com> <20100816102010.GB3276@rakim.wolfsonmicro.main> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from opensource2.wolfsonmicro.com (opensource.wolfsonmicro.com [80.75.67.52]) by alsa0.perex.cz (Postfix) with ESMTP id CF28C24418 for ; Mon, 16 Aug 2010 17:19:59 +0200 (CEST) Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Jassi Brar Cc: Seungwhan Youn , alsa-devel@alsa-project.org, Liam Girdwood , Seungwhan Youn List-Id: alsa-devel@alsa-project.org On Mon, Aug 16, 2010 at 09:51:35PM +0900, Jassi Brar wrote: > When CPU MASTER was default, people asked for SLAVE. But nobody asked > for MASTER since we selected SLAVE by default. Both work equally well, it just > saves our efforts. What were people actually complaining about? I suspect it was the root clock for the audio tree that they were concerned about rather than the I2S bus clock. > Btw, I thought CODEC usually provide more accurate signals and hence CPU SLAVE > is better. Is is too wrong? Well, the main issue is the quality of the root clock for the tree which I'd not propose to change away from the CODEC. In terms of just passing through a well generated clock at a useful rate it's fairly rare to have problems, the problem is getting that 256fs (or whatever) root clock.