C++ (Cpp) UNIPERIF_ITS_FIFO_ERROR_MASK Examples

Example #1

File: uniperif_reader.c Project: aejsmith/linux

/*
 * uni_reader_irq_handler
 * In case of error audio stream is stopped; stop action is protected via PCM
 * stream lock  to avoid race condition with trigger callback.
 */
static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
{
	irqreturn_t ret = IRQ_NONE;
	struct uniperif *reader = dev_id;
	unsigned int status;

	if (reader->state == UNIPERIF_STATE_STOPPED) {
		/* Unexpected IRQ: do nothing */
		dev_warn(reader->dev, "unexpected IRQ ");
		return IRQ_HANDLED;
	}

	/* Get interrupt status & clear them immediately */
	status = GET_UNIPERIF_ITS(reader);
	SET_UNIPERIF_ITS_BCLR(reader, status);

	/* Check for fifo overflow error */
	if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {
		dev_err(reader->dev, "FIFO error detected");

		snd_pcm_stream_lock(reader->substream);
		snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);
		snd_pcm_stream_unlock(reader->substream);

		return IRQ_HANDLED;
	}

	return ret;
}

Example #2

File: uniperif_player.c Project: AshishNamdev/linux

/*
 * uni_player_irq_handler
 * In case of error audio stream is stopped; stop action is protected via PCM
 * stream lock to avoid race condition with trigger callback.
 */
static irqreturn_t uni_player_irq_handler(int irq, void *dev_id)
{
	irqreturn_t ret = IRQ_NONE;
	struct uniperif *player = dev_id;
	unsigned int status;
	unsigned int tmp;

	if (player->state == UNIPERIF_STATE_STOPPED) {
		/* Unexpected IRQ: do nothing */
		return IRQ_NONE;
	}

	/* Get interrupt status & clear them immediately */
	status = GET_UNIPERIF_ITS(player);
	SET_UNIPERIF_ITS_BCLR(player, status);

	/* Check for fifo error (underrun) */
	if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(player))) {
		dev_err(player->dev, "FIFO underflow error detected\n");

		/* Interrupt is just for information when underflow recovery */
		if (player->underflow_enabled) {
			/* Update state to underflow */
			player->state = UNIPERIF_STATE_UNDERFLOW;

		} else {
			/* Disable interrupt so doesn't continually fire */
			SET_UNIPERIF_ITM_BCLR_FIFO_ERROR(player);

			/* Stop the player */
			snd_pcm_stream_lock(player->substream);
			snd_pcm_stop(player->substream, SNDRV_PCM_STATE_XRUN);
			snd_pcm_stream_unlock(player->substream);
		}

		ret = IRQ_HANDLED;
	}

	/* Check for dma error (overrun) */
	if (unlikely(status & UNIPERIF_ITS_DMA_ERROR_MASK(player))) {
		dev_err(player->dev, "DMA error detected\n");

		/* Disable interrupt so doesn't continually fire */
		SET_UNIPERIF_ITM_BCLR_DMA_ERROR(player);

		/* Stop the player */
		snd_pcm_stream_lock(player->substream);
		snd_pcm_stop(player->substream, SNDRV_PCM_STATE_XRUN);
		snd_pcm_stream_unlock(player->substream);

		ret = IRQ_HANDLED;
	}

	/* Check for underflow recovery done */
	if (unlikely(status & UNIPERIF_ITM_UNDERFLOW_REC_DONE_MASK(player))) {
		if (!player->underflow_enabled) {
			dev_err(player->dev,
				"unexpected Underflow recovering\n");
			return -EPERM;
		}
		/* Read the underflow recovery duration */
		tmp = GET_UNIPERIF_STATUS_1_UNDERFLOW_DURATION(player);
		dev_dbg(player->dev, "Underflow recovered (%d LR clocks max)\n",
			tmp);

		/* Clear the underflow recovery duration */
		SET_UNIPERIF_BIT_CONTROL_CLR_UNDERFLOW_DURATION(player);

		/* Update state to started */
		player->state = UNIPERIF_STATE_STARTED;

		ret = IRQ_HANDLED;
	}

	/* Check if underflow recovery failed */
	if (unlikely(status &
		     UNIPERIF_ITM_UNDERFLOW_REC_FAILED_MASK(player))) {
		dev_err(player->dev, "Underflow recovery failed\n");

		/* Stop the player */
		snd_pcm_stream_lock(player->substream);
		snd_pcm_stop(player->substream, SNDRV_PCM_STATE_XRUN);
		snd_pcm_stream_unlock(player->substream);

		ret = IRQ_HANDLED;
	}

	return ret;
}