From: Jeeja KP <jeeja.kp@xxxxxxxxx>
Use the DMA resume capability to resume the DMA position when
stream is suspended/resumed.
In suspend we save the position and when stream is resumed the stream needs
to be started from the position when the stream was suspended using the new
DMA resume capabilities
Signed-off-by: Jeeja KP <jeeja.kp@xxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
---
sound/soc/intel/skylake/skl-pcm.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c
index 39b4525d77db..f30ace6de035 100644
--- a/sound/soc/intel/skylake/skl-pcm.c
+++ b/sound/soc/intel/skylake/skl-pcm.c
@@ -393,6 +393,15 @@ static int skl_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
switch (cmd) {
case SNDRV_PCM_TRIGGER_RESUME:
skl_pcm_prepare(substream, dai);
+ /*
+ * enable DMA Resume enable bit for the stream, set the dpib
+ * & lpib position to resune before starting the DMA
+ */
+ snd_hdac_ext_stream_drsm_enable(ebus, true,
+ hdac_stream(stream)->index);
+ snd_hdac_ext_stream_set_dpibr(ebus, stream, stream->dpib);
+ snd_hdac_ext_stream_set_lpib(stream, stream->lpib);
+
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
/*
@@ -421,8 +430,17 @@ static int skl_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
return ret;
ret = skl_decoupled_trigger(substream, cmd);
- if (cmd == SNDRV_PCM_TRIGGER_SUSPEND)
+ if (cmd == SNDRV_PCM_TRIGGER_SUSPEND) {
+ /* save the dpib and lpib positions */
+ stream->dpib = readl(ebus->bus.remap_addr +
+ AZX_REG_VS_SDXDPIB_XBASE +
+ (AZX_REG_VS_SDXDPIB_XINTERVAL *
+ hdac_stream(stream)->index));
+
+ stream->lpib = snd_hdac_stream_get_pos_lpib(
+ hdac_stream(stream));
snd_hdac_ext_stream_decouple(ebus, stream, false);
+ }
break;
default:
--
1.9.1
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