From mboxrd@z Thu Jan 1 00:00:00 1970 From: Charles Keepax Subject: Re: ALSA SOC Driver (mxs-wm8753) Date: Fri, 18 Jul 2014 15:28:30 +0100 Message-ID: <20140718142830.GC12049@opensource.wolfsonmicro.com> References: <3c1cd0154ea542b992e00dce1cfc0a9a@DB4PR07MB252.eurprd07.prod.outlook.com> <20140718084415.GA12049@opensource.wolfsonmicro.com> <20140718105323.GB12049@opensource.wolfsonmicro.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from opensource.wolfsonmicro.com (opensource.wolfsonmicro.com [80.75.67.52]) by alsa0.perex.cz (Postfix) with ESMTP id 8A09E265649 for ; Fri, 18 Jul 2014 16:28:30 +0200 (CEST) Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Kevin Startup Cc: "alsa-devel@alsa-project.org" List-Id: alsa-devel@alsa-project.org On Fri, Jul 18, 2014 at 01:02:41PM +0000, Kevin Startup wrote: > Hi Charles > > Thanks very much, the pointers you gave me have helped a lot. I have changed the reference to .codec_dai_name to "wm8753-hifi" in the mxs-wm8753.c program which has made my CPU recognise the WM8753 as a valid ALSA device! > This makes me very happy as I have been trying to get this to happen for several weeks now! > > I still don't seem to be able to send sound to the device though. > I am now receiving this message: > > mxs-i2c 80058000.i2c: PIO: Failed to finish WRITE cmd! > > This happens a dozen times or so on bootup and any time that I try to write to one of the PCM devices .... > I wonder if you could give me any more pointers? > > Many Thanks > Kevin Looks like probably the i2c transactions are not being acked, afraid I don't know much about the i2c driver in question so not really sure. I assume this is the i2c link to the CODEC, so I would check the CODECs reset lines and supplies to make sure it has everything it needs to respond. Thanks, Charles