ASoC: sh: rz-ssi: Code cleanup and fixes

Merge series from Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>:

Hi All,

This patch series does code cleanup and fixes to the rz-ssi driver.

Cheers,
Prabhakar

Lad Prabhakar (5):
  ASoC: sh: rz-ssi: Drop calling rz_ssi_pio_recv() recursively
  ASoC: sh: rz-ssi: Make the data structures available before
    registering the handlers
  ASoC: sh: rz-ssi: Drop ssi parameter from rz_ssi_stream_init()
  ASoC: sh: rz-ssi: Make return type of rz_ssi_stream_is_valid() to bool
  ASoC: sh: rz-ssi: Add functions to get/set substream pointer

 sound/soc/sh/rz-ssi.c | 147 ++++++++++++++++++++++++------------------
 1 file changed, 86 insertions(+), 61 deletions(-)

--
2.17.1

sound/soc/sh/rz-ssi.c

@@ -188,22 +188,21 @@ static inline bool rz_ssi_is_dma_enabled(struct rz_ssi_priv *ssi)
 	return (ssi->playback.dma_ch && (ssi->dma_rt || ssi->capture.dma_ch));
 }
 
-static int rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi,
-				  struct rz_ssi_stream *strm)
+static bool rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi,
+				   struct rz_ssi_stream *strm)
 {
 	unsigned long flags;
-	int ret;
+	bool ret;
 
 	spin_lock_irqsave(&ssi->lock, flags);
-	ret = !!(strm->substream && strm->substream->runtime);
+	ret = strm->substream && strm->substream->runtime;
 	spin_unlock_irqrestore(&ssi->lock, flags);
 
 	return ret;
 }
 
-static int rz_ssi_stream_init(struct rz_ssi_priv *ssi,
-			      struct rz_ssi_stream *strm,
-			      struct snd_pcm_substream *substream)
+static void rz_ssi_stream_init(struct rz_ssi_stream *strm,
+			       struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 
@@ -219,8 +218,6 @@ static int rz_ssi_stream_init(struct rz_ssi_priv *ssi,
 
 	/* fifo init */
 	strm->fifo_sample_size = SSI_FIFO_DEPTH;
-
-	return 0;
 }
 
 static void rz_ssi_stream_quit(struct rz_ssi_priv *ssi,
@@ -411,54 +408,56 @@ static int rz_ssi_pio_recv(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 {
 	struct snd_pcm_substream *substream = strm->substream;
 	struct snd_pcm_runtime *runtime;
+	bool done = false;
 	u16 *buf;
 	int fifo_samples;
 	int frames_left;
-	int samples = 0;
+	int samples;
 	int i;
 
 	if (!rz_ssi_stream_is_valid(ssi, strm))
 		return -EINVAL;
 
 	runtime = substream->runtime;
-	/* frames left in this period */
-	frames_left = runtime->period_size - (strm->buffer_pos %
-					      runtime->period_size);
-	if (frames_left == 0)
-		frames_left = runtime->period_size;
-
-	/* Samples in RX FIFO */
-	fifo_samples = (rz_ssi_reg_readl(ssi, SSIFSR) >>
-			SSIFSR_RDC_SHIFT) & SSIFSR_RDC_MASK;
 
-	/* Only read full frames at a time */
-	while (frames_left && (fifo_samples >= runtime->channels)) {
-		samples += runtime->channels;
-		fifo_samples -= runtime->channels;
-		frames_left--;
-	}
+	while (!done) {
+		/* frames left in this period */
+		frames_left = runtime->period_size -
+			      (strm->buffer_pos % runtime->period_size);
+		if (!frames_left)
+			frames_left = runtime->period_size;
+
+		/* Samples in RX FIFO */
+		fifo_samples = (rz_ssi_reg_readl(ssi, SSIFSR) >>
+				SSIFSR_RDC_SHIFT) & SSIFSR_RDC_MASK;
+
+		/* Only read full frames at a time */
+		samples = 0;
+		while (frames_left && (fifo_samples >= runtime->channels)) {
+			samples += runtime->channels;
+			fifo_samples -= runtime->channels;
+			frames_left--;
+		}
 
-	/* not enough samples yet */
-	if (samples == 0)
-		return 0;
+		/* not enough samples yet */
+		if (!samples)
+			break;
 
-	/* calculate new buffer index */
-	buf = (u16 *)(runtime->dma_area);
-	buf += strm->buffer_pos * runtime->channels;
+		/* calculate new buffer index */
+		buf = (u16 *)(runtime->dma_area);
+		buf += strm->buffer_pos * runtime->channels;
 
-	/* Note, only supports 16-bit samples */
-	for (i = 0; i < samples; i++)
-		*buf++ = (u16)(rz_ssi_reg_readl(ssi, SSIFRDR) >> 16);
+		/* Note, only supports 16-bit samples */
+		for (i = 0; i < samples; i++)
+			*buf++ = (u16)(rz_ssi_reg_readl(ssi, SSIFRDR) >> 16);
 
-	rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0);
-	rz_ssi_pointer_update(strm, samples / runtime->channels);
+		rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0);
+		rz_ssi_pointer_update(strm, samples / runtime->channels);
 
-	/*
-	 * If we finished this period, but there are more samples in
-	 * the RX FIFO, call this function again
-	 */
-	if (frames_left == 0 && fifo_samples >= runtime->channels)
-		rz_ssi_pio_recv(ssi, strm);
+		/* check if there are no more samples in the RX FIFO */
+		if (!(!frames_left && fifo_samples >= runtime->channels))
+			done = true;
+	}
 
 	return 0;
 }
@@ -726,9 +725,7 @@ static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 		rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, 0);
 		udelay(5);
 
-		ret = rz_ssi_stream_init(ssi, strm, substream);
-		if (ret)
-			goto done;
+		rz_ssi_stream_init(strm, substream);
 
 		if (ssi->dma_rt) {
 			bool is_playback;
@@ -975,6 +972,9 @@ static int rz_ssi_probe(struct platform_device *pdev)
 	ssi->playback.priv = ssi;
 	ssi->capture.priv = ssi;
 
+	spin_lock_init(&ssi->lock);
+	dev_set_drvdata(&pdev->dev, ssi);
+
 	/* Error Interrupt */
 	ssi->irq_int = platform_get_irq_byname(pdev, "int_req");
 	if (ssi->irq_int < 0)
@@ -1027,8 +1027,6 @@ static int rz_ssi_probe(struct platform_device *pdev)
 		return dev_err_probe(ssi->dev, ret, "pm_runtime_resume_and_get failed\n");
 	}
 
-	spin_lock_init(&ssi->lock);
-	dev_set_drvdata(&pdev->dev, ssi);
 	ret = devm_snd_soc_register_component(&pdev->dev, &rz_ssi_soc_component,
 					      rz_ssi_soc_dai,
 					      ARRAY_SIZE(rz_ssi_soc_dai));