From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Ujfalusi Subject: Re: [PATCH] ASoC: tpa6130a2: Revisit power-up sequence Date: Mon, 8 Nov 2010 11:38:13 +0200 Message-ID: <201011081138.13288.peter.ujfalusi@nokia.com> References: <1289206677-11886-1-git-send-email-jhnikula@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mgw-sa01.nokia.com (smtp.nokia.com [147.243.1.47]) by alsa0.perex.cz (Postfix) with ESMTP id 377FA2439F for ; Mon, 8 Nov 2010 10:38:12 +0100 (CET) In-Reply-To: <1289206677-11886-1-git-send-email-jhnikula@gmail.com> 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: ext Jarkko Nikula Cc: "alsa-devel@alsa-project.org" , Mark Brown , Liam Girdwood List-Id: alsa-devel@alsa-project.org On Monday 08 November 2010 10:57:57 ext Jarkko Nikula wrote: > There are no known problems with current power-up sequence which first sets > the /shutdown pin high and then enables the supply. However, swap the order > so that the device is kept in shutdown/reset mode during the supply voltage > transition since slowly rising voltages can usually cause problems if the > device is not kept in reset. > > Signed-off-by: Jarkko Nikula > Cc: Peter Ujfalusi Yes, it is safer to keep the amp in reset during voltage ramp. Acked-by: Peter Ujfalusi