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audio: dai-zephyr/host-zephyr: stop dma only once #6849

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Merged
lgirdwood merged 1 commit into from
Dec 21, 2022
Merged

audio: dai-zephyr/host-zephyr: stop dma only once #6849

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23 changes: 18 additions & 5 deletions src/audio/dai-zephyr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1014,9 +1014,11 @@ static int dai_comp_trigger_internal(struct comp_dev *dev, int cmd)
/* only start the DAI if we are not XRUN handling */
if (dd->xrun == 0) {
/* recover valid start position */
ret = dma_stop(dd->chan->dma->z_dev, dd->chan->index);
if (ret < 0)
return ret;
if (dev->state == COMP_STATE_ACTIVE) {
ret = dma_stop(dd->chan->dma->z_dev, dd->chan->index);
if (ret < 0)
return ret;
}

/* dma_config needed after stop */
ret = dma_config(dd->chan->dma->z_dev, dd->chan->index, dd->z_config);
Expand Down Expand Up @@ -1054,12 +1056,23 @@ static int dai_comp_trigger_internal(struct comp_dev *dev, int cmd)
dai_trigger_op(dd->dai, cmd, dev->direction);
#else
dai_trigger_op(dd->dai, cmd, dev->direction);
ret = dma_stop(dd->chan->dma->z_dev, dd->chan->index);
if (dev->state == COMP_STATE_ACTIVE) {
ret = dma_stop(dd->chan->dma->z_dev, dd->chan->index);
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@kv2019i kv2019i Dec 19, 2022

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I guess we have to do this now. I'm a bit worried about coupling device state and DMA state this way. This opens a problem if some state is set to not ACTIVE in some other piece of code. Then dma_stop() is never called. Probably this is ok now, but it's actually pretty hard to verify this is the case by reading current dai-zephyr.c code.

OTOH, it seems there are no calls to get dma channel status with the public API. Right @teburd @juimonen ? dma_get_status() does not seem fit to gate calls to dma_stop().

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@abonislawski abonislawski Dec 20, 2022

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This will work but the best way would be to balance this in zephyr driver, in gpdma we already have channel internal state so calling dma_stop several times will not result in unbalanced pm state.

	/* Validate the channel state */
	if (chan_data->state != DW_DMA_ACTIVE &&
	    chan_data->state != DW_DMA_SUSPENDED) {
		ret = -EINVAL;
		goto out;
	}

but there is no such internal state check in HDA zephyr driver so we need to take care of this in SOF (this PR) or track device state in Zephyr (HDA driver)

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@kv2019i kv2019i Dec 20, 2022

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@abonislawski But as SOF code should work with any Zephyr driver, just fixing HDA is not enough, we'd need to have this as a guarantee at Zephyr dma.h level.

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@abonislawski abonislawski Dec 20, 2022 •
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at dma.h level we can only expose current state

} else {
comp_warn(dev, "dma was stopped earlier");
ret = 0;
}
#endif
break;
case COMP_TRIGGER_PAUSE:
comp_dbg(dev, "dai_comp_trigger_internal(), PAUSE");
ret = dma_suspend(dd->chan->dma->z_dev, dd->chan->index);
if (dev->state == COMP_STATE_ACTIVE) {
ret = dma_suspend(dd->chan->dma->z_dev, dd->chan->index);
} else {
comp_warn(dev, "dma was stopped earlier");
ret = 0;
}

dai_trigger_op(dd->dai, cmd, dev->direction);
break;
case COMP_TRIGGER_PRE_START:
Expand Down
14 changes: 9 additions & 5 deletions src/audio/host-zephyr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -627,10 +627,13 @@ static int host_trigger(struct comp_dev *dev, int cmd)
break;
case COMP_TRIGGER_STOP:
case COMP_TRIGGER_XRUN:
ret = dma_stop(hd->chan->dma->z_dev, hd->chan->index);
if (ret < 0)
comp_err(dev, "host_trigger(): dma stop failed: %d",
ret);
if (dev->state == COMP_STATE_ACTIVE) {
ret = dma_stop(hd->chan->dma->z_dev, hd->chan->index);
if (ret < 0)
comp_err(dev, "host_trigger(): dma stop failed: %d",
ret);
}

break;
default:
break;
Expand Down Expand Up @@ -1048,7 +1051,8 @@ static int host_reset(struct comp_dev *dev)
comp_dbg(dev, "host_reset()");

if (hd->chan) {
dma_stop(hd->chan->dma->z_dev, hd->chan->index);
if (dev->state == COMP_STATE_ACTIVE)
dma_stop(hd->chan->dma->z_dev, hd->chan->index);

/* remove callback */
notifier_unregister(dev, hd->chan, NOTIFIER_ID_DMA_COPY);
Expand Down
4 changes: 3 additions & 1 deletion src/ipc/ipc4/dai.c
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Expand Up @@ -172,7 +172,9 @@ void dai_dma_release(struct comp_dev *dev)
* TODO: refine power management when stream is paused
*/
#if CONFIG_ZEPHYR_NATIVE_DRIVERS
dma_stop(dd->chan->dma->z_dev, dd->chan->index);
/* if reset is after pause dma has already been stopped */
if (dev->state != COMP_STATE_PAUSED)
dma_stop(dd->chan->dma->z_dev, dd->chan->index);

/* remove callback */
notifier_unregister(dev, dd->chan, NOTIFIER_ID_DMA_COPY);
Expand Down