ALSA: dmaengine_pcm: terminate dmaengine before synchronize

When dmaengine supports pause function, in suspend state,
dmaengine_pause() is called instead of dmaengine_terminate_async(),

In end of playback stream, the runtime->state will go to
SNDRV_PCM_STATE_DRAINING, if system suspend & resume happen
at this time, application will not resume playback stream, the
stream will be closed directly, the dmaengine_terminate_async()
will not be called before the dmaengine_synchronize(), which
violates the call sequence for dmaengine_synchronize().

This behavior also happens for capture streams, but there is no
SNDRV_PCM_STATE_DRAINING state for capture. So use
dmaengine_tx_status() to check the DMA status if the status is
DMA_PAUSED, then call dmaengine_terminate_async() to terminate
dmaengine before dmaengine_synchronize().

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/1718851218-27803-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c
index 12aa1cef11a133ae0a8f801091e27cd0c08fb2aa..7346c993a06713d46d5276fe82909536f4f25e45 100644 (file)
--- a/sound/core/pcm_dmaengine.c
+++ b/sound/core/pcm_dmaengine.c
@@ -358,6 +358,12 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
 {
        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+       struct dma_tx_state state;
+       enum dma_status status;
+
+       status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state);
+       if (status == DMA_PAUSED)
+               dmaengine_terminate_async(prtd->dma_chan);
 
        dmaengine_synchronize(prtd->dma_chan);
        kfree(prtd);
@@ -378,6 +384,12 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
 int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
 {
        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+       struct dma_tx_state state;
+       enum dma_status status;
+
+       status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state);
+       if (status == DMA_PAUSED)
+               dmaengine_terminate_async(prtd->dma_chan);
 
        dmaengine_synchronize(prtd->dma_chan);
        dma_release_channel(prtd->dma_chan);