From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dirk Behme Subject: Re: Problem with ALSA in 2.6.14-omap2 on OSK Date: Wed, 23 Nov 2005 17:10:03 +0100 Message-ID: <4384945B.7050700@de.bosch.com> References: <42848A5C5A0D1E47B026E644DD49B08E683708@mail> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <42848A5C5A0D1E47B026E644DD49B08E683708@mail> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-omap-open-source-bounces@linux.omap.com Errors-To: linux-omap-open-source-bounces@linux.omap.com To: linux-omap-open-source@linux.omap.com Cc: Yves Godin List-Id: linux-omap@vger.kernel.org Yves Godin wrote: > It seems that something has change in the driver for the DMA in > 2.6.14-omap2. > > When I play a pure tone (ALSA driver), I ear some glitches in the audio > every 5-10 secconds. Everithing was correct with 2.6.14-rc1. > > From what I can see with a scope on the serial data sent to the codec, > it seems that some samples (a complete buffer??) are repeated from time > to time. It's easier to ear it when playing a pure tone (ex 1Khz). > > Note that my alsa driver is slightly modified to play 24 bits audio > samples instead of 16 bits (DMA is configured in 32 bits). > > The files from the alsa driver have not changed between 2.6.14-rc1 and > 2.6.14-omap2. So I supposed the changes have been made to the OMAP dma > drivers. On 2.6.15-rc2-omap1 on OSK I can reproduce this using madplay and mp3. All 5-10 seconds a short part is repeated. Any news or ideas about this? Thanks Dirk