From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars-Peter Clausen Subject: Re: [PATCH] ALSA: pcm_dmaengine: Add check during device suspend Date: Mon, 19 May 2014 11:28:36 +0200 Message-ID: <5379CEC4.9050001@metafoo.de> References: <1400491433-16860-1-git-send-email-tushar.behera@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1400491433-16860-1-git-send-email-tushar.behera@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: Tushar Behera Cc: linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, tiwai@suse.de, perex@perex.cz List-Id: alsa-devel@alsa-project.org On 05/19/2014 11:23 AM, Tushar Behera wrote: > Currently snd_dmaengine_pcm_trigger() calls dmaengine_pause() > unconditinally during device suspend. In case where DMA controller > doesn't support PAUSE/RESUME functionality, this call is not able > to stop the DMA controller. In this scenario, audio playback doesn't > resume after device resume. > > Calling dmaengine_pause/dmaengine_terminate_all conditionally fixes > the issue. > > It has been tested with audio playback on Samsung platform having > PL330 DMA controller which doesn't support PAUSE/RESUME. > > Signed-off-by: Tushar Behera Acked-by: Lars-Peter Clausen Thanks. > --- > sound/core/pcm_dmaengine.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c > index 94d0873..76cbb9e 100644 > --- a/sound/core/pcm_dmaengine.c > +++ b/sound/core/pcm_dmaengine.c > @@ -182,6 +182,7 @@ static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream) > int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) > { > struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); > + struct snd_pcm_runtime *runtime = substream->runtime; > int ret; > > switch (cmd) { > @@ -196,6 +197,11 @@ int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) > dmaengine_resume(prtd->dma_chan); > break; > case SNDRV_PCM_TRIGGER_SUSPEND: > + if (runtime->info & SNDRV_PCM_INFO_PAUSE) > + dmaengine_pause(prtd->dma_chan); > + else > + dmaengine_terminate_all(prtd->dma_chan); > + break; > case SNDRV_PCM_TRIGGER_PAUSE_PUSH: > dmaengine_pause(prtd->dma_chan); > break; >