diff mbox series

ASoC: sh: rz-ssi: Add full duplex support

Message ID 20240715092322.119879-1-biju.das.jz@bp.renesas.com (mailing list archive)
State Accepted
Delegated to: Kieran Bingham
Headers show
Series ASoC: sh: rz-ssi: Add full duplex support | expand

Commit Message

Biju Das July 15, 2024, 9:23 a.m. UTC 
Add full duplex support, to support simultaneous
playback/record on the same ssi channel.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 sound/soc/sh/rz-ssi.c | 257 ++++++++++++++++++++++++++++++------------
 1 file changed, 182 insertions(+), 75 deletions(-)

Comments

Mark Brown July 29, 2024, 5:17 p.m. UTC | #1 
On Mon, 15 Jul 2024 10:23:20 +0100, Biju Das wrote:
> Add full duplex support, to support simultaneous
> playback/record on the same ssi channel.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: sh: rz-ssi: Add full duplex support
      commit: 4f8cd05a43058b165b83f12f656e60415d2ff5be

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark
diff mbox series

Patch

diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c
index 9d103646973a..d0bf0487bf1b 100644
--- a/sound/soc/sh/rz-ssi.c
+++ b/sound/soc/sh/rz-ssi.c
@@ -52,6 +52,7 @@ 
 #define SSIFCR_RIE		BIT(2)
 #define SSIFCR_TFRST		BIT(1)
 #define SSIFCR_RFRST		BIT(0)
+#define SSIFCR_FIFO_RST		(SSIFCR_TFRST | SSIFCR_RFRST)
 
 #define SSIFSR_TDC_MASK		0x3f
 #define SSIFSR_TDC_SHIFT	24
@@ -130,6 +131,14 @@  struct rz_ssi_priv {
 	bool lrckp_fsync_fall;	/* LR clock polarity (SSICR.LRCKP) */
 	bool bckp_rise;	/* Bit clock polarity (SSICR.BCKP) */
 	bool dma_rt;
+
+	/* Full duplex communication support */
+	struct {
+		unsigned int rate;
+		unsigned int channels;
+		unsigned int sample_width;
+		unsigned int sample_bits;
+	} hw_params_cache;
 };
 
 static void rz_ssi_dma_complete(void *data);
@@ -208,6 +217,11 @@  static bool rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi,
 	return ret;
 }
 
+static inline bool rz_ssi_is_stream_running(struct rz_ssi_stream *strm)
+{
+	return strm->substream && strm->running;
+}
+
 static void rz_ssi_stream_init(struct rz_ssi_stream *strm,
 			       struct snd_pcm_substream *substream)
 {
@@ -303,13 +317,53 @@  static int rz_ssi_clk_setup(struct rz_ssi_priv *ssi, unsigned int rate,
 	return 0;
 }
 
+static void rz_ssi_set_idle(struct rz_ssi_priv *ssi)
+{
+	int timeout;
+
+	/* Disable irqs */
+	rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TUIEN | SSICR_TOIEN |
+			     SSICR_RUIEN | SSICR_ROIEN, 0);
+	rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_TIE | SSIFCR_RIE, 0);
+
+	/* Clear all error flags */
+	rz_ssi_reg_mask_setl(ssi, SSISR,
+			     (SSISR_TOIRQ | SSISR_TUIRQ | SSISR_ROIRQ |
+			      SSISR_RUIRQ), 0);
+
+	/* Wait for idle */
+	timeout = 100;
+	while (--timeout) {
+		if (rz_ssi_reg_readl(ssi, SSISR) & SSISR_IIRQ)
+			break;
+		udelay(1);
+	}
+
+	if (!timeout)
+		dev_info(ssi->dev, "timeout waiting for SSI idle\n");
+
+	/* Hold FIFOs in reset */
+	rz_ssi_reg_mask_setl(ssi, SSIFCR, 0,
+			     SSIFCR_TFRST | SSIFCR_RFRST);
+}
+
 static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 {
 	bool is_play = rz_ssi_stream_is_play(ssi, strm->substream);
+	bool is_full_duplex;
 	u32 ssicr, ssifcr;
 
+	is_full_duplex = rz_ssi_is_stream_running(&ssi->playback) ||
+		rz_ssi_is_stream_running(&ssi->capture);
 	ssicr = rz_ssi_reg_readl(ssi, SSICR);
-	ssifcr = rz_ssi_reg_readl(ssi, SSIFCR) & ~0xF;
+	ssifcr = rz_ssi_reg_readl(ssi, SSIFCR);
+	if (!is_full_duplex) {
+		ssifcr &= ~0xF;
+	} else {
+		rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TEN | SSICR_REN, 0);
+		rz_ssi_set_idle(ssi);
+		ssifcr &= ~SSIFCR_FIFO_RST;
+	}
 
 	/* FIFO interrupt thresholds */
 	if (rz_ssi_is_dma_enabled(ssi))
@@ -322,10 +376,14 @@  static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 	/* enable IRQ */
 	if (is_play) {
 		ssicr |= SSICR_TUIEN | SSICR_TOIEN;
-		ssifcr |= SSIFCR_TIE | SSIFCR_RFRST;
+		ssifcr |= SSIFCR_TIE;
+		if (!is_full_duplex)
+			ssifcr |= SSIFCR_RFRST;
 	} else {
 		ssicr |= SSICR_RUIEN | SSICR_ROIEN;
-		ssifcr |= SSIFCR_RIE | SSIFCR_TFRST;
+		ssifcr |= SSIFCR_RIE;
+		if (!is_full_duplex)
+			ssifcr |= SSIFCR_TFRST;
 	}
 
 	rz_ssi_reg_writel(ssi, SSICR, ssicr);
@@ -337,7 +395,11 @@  static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 			      SSISR_RUIRQ), 0);
 
 	strm->running = 1;
-	ssicr |= is_play ? SSICR_TEN : SSICR_REN;
+	if (is_full_duplex)
+		ssicr |= SSICR_TEN | SSICR_REN;
+	else
+		ssicr |= is_play ? SSICR_TEN : SSICR_REN;
+
 	rz_ssi_reg_writel(ssi, SSICR, ssicr);
 
 	return 0;
@@ -345,10 +407,12 @@  static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 
 static int rz_ssi_stop(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 {
-	int timeout;
-
 	strm->running = 0;
 
+	if (rz_ssi_is_stream_running(&ssi->playback) ||
+	    rz_ssi_is_stream_running(&ssi->capture))
+		return 0;
+
 	/* Disable TX/RX */
 	rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TEN | SSICR_REN, 0);
 
@@ -356,30 +420,7 @@  static int rz_ssi_stop(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 	if (rz_ssi_is_dma_enabled(ssi))
 		dmaengine_terminate_async(strm->dma_ch);
 
-	/* Disable irqs */
-	rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TUIEN | SSICR_TOIEN |
-			     SSICR_RUIEN | SSICR_ROIEN, 0);
-	rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_TIE | SSIFCR_RIE, 0);
-
-	/* Clear all error flags */
-	rz_ssi_reg_mask_setl(ssi, SSISR,
-			     (SSISR_TOIRQ | SSISR_TUIRQ | SSISR_ROIRQ |
-			      SSISR_RUIRQ), 0);
-
-	/* Wait for idle */
-	timeout = 100;
-	while (--timeout) {
-		if (rz_ssi_reg_readl(ssi, SSISR) & SSISR_IIRQ)
-			break;
-		udelay(1);
-	}
-
-	if (!timeout)
-		dev_info(ssi->dev, "timeout waiting for SSI idle\n");
-
-	/* Hold FIFOs in reset */
-	rz_ssi_reg_mask_setl(ssi, SSIFCR, 0,
-			     SSIFCR_TFRST | SSIFCR_RFRST);
+	rz_ssi_set_idle(ssi);
 
 	return 0;
 }
@@ -512,66 +553,90 @@  static int rz_ssi_pio_send(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
 
 static irqreturn_t rz_ssi_interrupt(int irq, void *data)
 {
-	struct rz_ssi_stream *strm = NULL;
+	struct rz_ssi_stream *strm_playback = NULL;
+	struct rz_ssi_stream *strm_capture = NULL;
 	struct rz_ssi_priv *ssi = data;
 	u32 ssisr = rz_ssi_reg_readl(ssi, SSISR);
 
 	if (ssi->playback.substream)
-		strm = &ssi->playback;
-	else if (ssi->capture.substream)
-		strm = &ssi->capture;
-	else
+		strm_playback = &ssi->playback;
+	if (ssi->capture.substream)
+		strm_capture = &ssi->capture;
+
+	if (!strm_playback && !strm_capture)
 		return IRQ_HANDLED; /* Left over TX/RX interrupt */
 
 	if (irq == ssi->irq_int) { /* error or idle */
-		if (ssisr & SSISR_TUIRQ)
-			strm->uerr_num++;
-		if (ssisr & SSISR_TOIRQ)
-			strm->oerr_num++;
-		if (ssisr & SSISR_RUIRQ)
-			strm->uerr_num++;
-		if (ssisr & SSISR_ROIRQ)
-			strm->oerr_num++;
-
-		if (ssisr & (SSISR_TUIRQ | SSISR_TOIRQ | SSISR_RUIRQ |
-			     SSISR_ROIRQ)) {
-			/* Error handling */
-			/* You must reset (stop/restart) after each interrupt */
-			rz_ssi_stop(ssi, strm);
-
-			/* Clear all flags */
-			rz_ssi_reg_mask_setl(ssi, SSISR, SSISR_TOIRQ |
-					     SSISR_TUIRQ | SSISR_ROIRQ |
-					     SSISR_RUIRQ, 0);
-
-			/* Add/remove more data */
-			strm->transfer(ssi, strm);
-
-			/* Resume */
-			rz_ssi_start(ssi, strm);
+		bool is_stopped = false;
+		int i, count;
+
+		if (rz_ssi_is_dma_enabled(ssi))
+			count = 4;
+		else
+			count = 1;
+
+		if (ssisr & (SSISR_RUIRQ | SSISR_ROIRQ | SSISR_TUIRQ | SSISR_TOIRQ))
+			is_stopped = true;
+
+		if (ssi->capture.substream && is_stopped) {
+			if (ssisr & SSISR_RUIRQ)
+				strm_capture->uerr_num++;
+			if (ssisr & SSISR_ROIRQ)
+				strm_capture->oerr_num++;
+
+			rz_ssi_stop(ssi, strm_capture);
 		}
+
+		if (ssi->playback.substream && is_stopped) {
+			if (ssisr & SSISR_TUIRQ)
+				strm_playback->uerr_num++;
+			if (ssisr & SSISR_TOIRQ)
+				strm_playback->oerr_num++;
+
+			rz_ssi_stop(ssi, strm_playback);
+		}
+
+		/* Clear all flags */
+		rz_ssi_reg_mask_setl(ssi, SSISR, SSISR_TOIRQ | SSISR_TUIRQ |
+				     SSISR_ROIRQ | SSISR_RUIRQ, 0);
+
+		/* Add/remove more data */
+		if (ssi->capture.substream && is_stopped) {
+			for (i = 0; i < count; i++)
+				strm_capture->transfer(ssi, strm_capture);
+		}
+
+		if (ssi->playback.substream && is_stopped) {
+			for (i = 0; i < count; i++)
+				strm_playback->transfer(ssi, strm_playback);
+		}
+
+		/* Resume */
+		if (ssi->playback.substream && is_stopped)
+			rz_ssi_start(ssi, &ssi->playback);
+		if (ssi->capture.substream && is_stopped)
+			rz_ssi_start(ssi, &ssi->capture);
 	}
 
-	if (!strm->running)
+	if (!rz_ssi_is_stream_running(&ssi->playback) &&
+	    !rz_ssi_is_stream_running(&ssi->capture))
 		return IRQ_HANDLED;
 
 	/* tx data empty */
-	if (irq == ssi->irq_tx)
-		strm->transfer(ssi, &ssi->playback);
+	if (irq == ssi->irq_tx && rz_ssi_is_stream_running(&ssi->playback))
+		strm_playback->transfer(ssi, &ssi->playback);
 
 	/* rx data full */
-	if (irq == ssi->irq_rx) {
-		strm->transfer(ssi, &ssi->capture);
+	if (irq == ssi->irq_rx && rz_ssi_is_stream_running(&ssi->capture)) {
+		strm_capture->transfer(ssi, &ssi->capture);
 		rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0);
 	}
 
 	if (irq == ssi->irq_rt) {
-		struct snd_pcm_substream *substream = strm->substream;
-
-		if (rz_ssi_stream_is_play(ssi, substream)) {
-			strm->transfer(ssi, &ssi->playback);
+		if (ssi->playback.substream) {
+			strm_playback->transfer(ssi, &ssi->playback);
 		} else {
-			strm->transfer(ssi, &ssi->capture);
+			strm_capture->transfer(ssi, &ssi->capture);
 			rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0);
 		}
 	}
@@ -731,9 +796,12 @@  static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		/* Soft Reset */
-		rz_ssi_reg_mask_setl(ssi, SSIFCR, 0, SSIFCR_SSIRST);
-		rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, 0);
-		udelay(5);
+		if (!rz_ssi_is_stream_running(&ssi->playback) &&
+		    !rz_ssi_is_stream_running(&ssi->capture)) {
+			rz_ssi_reg_mask_setl(ssi, SSIFCR, 0, SSIFCR_SSIRST);
+			rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, 0);
+			udelay(5);
+		}
 
 		rz_ssi_stream_init(strm, substream);
 
@@ -824,14 +892,41 @@  static int rz_ssi_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	return 0;
 }
 
+static bool rz_ssi_is_valid_hw_params(struct rz_ssi_priv *ssi, unsigned int rate,
+				      unsigned int channels,
+				      unsigned int sample_width,
+				      unsigned int sample_bits)
+{
+	if (ssi->hw_params_cache.rate != rate ||
+	    ssi->hw_params_cache.channels != channels ||
+	    ssi->hw_params_cache.sample_width != sample_width ||
+	    ssi->hw_params_cache.sample_bits != sample_bits)
+		return false;
+
+	return true;
+}
+
+static void rz_ssi_cache_hw_params(struct rz_ssi_priv *ssi, unsigned int rate,
+				   unsigned int channels,
+				   unsigned int sample_width,
+				   unsigned int sample_bits)
+{
+	ssi->hw_params_cache.rate = rate;
+	ssi->hw_params_cache.channels = channels;
+	ssi->hw_params_cache.sample_width = sample_width;
+	ssi->hw_params_cache.sample_bits = sample_bits;
+}
+
 static int rz_ssi_dai_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params,
 				struct snd_soc_dai *dai)
 {
 	struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai);
+	struct rz_ssi_stream *strm = rz_ssi_stream_get(ssi, substream);
 	unsigned int sample_bits = hw_param_interval(params,
 					SNDRV_PCM_HW_PARAM_SAMPLE_BITS)->min;
 	unsigned int channels = params_channels(params);
+	unsigned int rate = params_rate(params);
 
 	if (sample_bits != 16) {
 		dev_err(ssi->dev, "Unsupported sample width: %d\n",
@@ -845,8 +940,20 @@  static int rz_ssi_dai_hw_params(struct snd_pcm_substream *substream,
 		return -EINVAL;
 	}
 
-	return rz_ssi_clk_setup(ssi, params_rate(params),
-				params_channels(params));
+	if (rz_ssi_is_stream_running(&ssi->playback) ||
+	    rz_ssi_is_stream_running(&ssi->capture)) {
+		if (rz_ssi_is_valid_hw_params(ssi, rate, channels,
+					      strm->sample_width, sample_bits))
+			return 0;
+
+		dev_err(ssi->dev, "Full duplex needs same HW params\n");
+		return -EINVAL;
+	}
+
+	rz_ssi_cache_hw_params(ssi, rate, channels, strm->sample_width,
+			       sample_bits);
+
+	return rz_ssi_clk_setup(ssi, rate, channels);
 }
 
 static const struct snd_soc_dai_ops rz_ssi_dai_ops = {