From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars-Peter Clausen Subject: Re: ASoC: tegra: Does the PCM_TRIGGER_{PAUSE, RESUME} emulation really work? Date: Sat, 23 Mar 2013 11:00:50 +0100 Message-ID: <514D7D52.5020504@metafoo.de> References: <514C8618.9070307@metafoo.de> <514CEAA5.4040505@wwwdotorg.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp-out-087.synserver.de (smtp-out-087.synserver.de [212.40.185.87]) by alsa0.perex.cz (Postfix) with ESMTP id F1DDB26523E for ; Sat, 23 Mar 2013 10:58:50 +0100 (CET) In-Reply-To: <514CEAA5.4040505@wwwdotorg.org> 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: Stephen Warren Cc: Linux-ALSA , Laxman Dewangan List-Id: alsa-devel@alsa-project.org On 03/23/2013 12:35 AM, Stephen Warren wrote: > On 03/22/2013 10:26 AM, Lars-Peter Clausen wrote: >> Hi, >> >> The tegra pcm driver tries to emulate SNDRV_PCM_TRIGGER_PAUSE and >> SNDRV_PCM_TRIGGER_RESUME. By passing SNDRV_PCM_TRIGGER_START and >> SNDRV_PCM_TRIGGER_STOP to snd_dmaengine_pcm_trigger. But does this really >> work? The old non-dmaengine based driver implemented this properly. I'd >> reset the dma position pointer for SNDRV_PCM_TRIGGER_START, but keep it >> where it was for SNDRV_PCM_TRIGGER_RESUME. But as far as I can see with the >> dmaengine based driver the pointer always gets reset to 0 for both >> SNDRV_PCM_TRIGGER_START and SNDRV_PCM_TRIGGER_RESUME. > > It's quite possible this hasn't been tested, or tested recently. I don't > recall how to test PAUSE/RESUME. Can you enlighten me? Hm, I don't know of an application that is specificity designed to test pause/resume, but any application using snd_pcm_pause, should be fine. - Lars