diff mbox series

[1/1] ASoC: dwc: Add TDM mode support

Message ID 20230622200031.120168-1-fido_max@inbox.ru
State New
Headers
Series [1/1] ASoC: dwc: Add TDM mode support |

Commit Message

Maxim Kochetkov June 22, 2023, 8 p.m. UTC 
  Depending on hardware implementaion of DWC I2S controller may support
TDM mode if enabled in SoC at design time.
Unfortunately there is no way to detect TDM capability for DWC by
reading registers. Anyway, if such capability enabled, TDM mode
can be enabled and configured by dai-tdm-slot-* DT options.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
---
 sound/soc/dwc/dwc-i2s.c | 65 +++++++++++++++++++++++++++++++++++++++--
 sound/soc/dwc/dwc-pcm.c |  8 ++---
 sound/soc/dwc/local.h   | 24 +++++++++++++++
 3 files changed, 90 insertions(+), 7 deletions(-)

Comments

Maxim Kochetkov July 3, 2023, 6:16 a.m. UTC | #1 
On 22.06.2023 23:00, Maxim Kochetkov wrote:
> Depending on hardware implementaion of DWC I2S controller may support
> TDM mode if enabled in SoC at design time.
> Unfortunately there is no way to detect TDM capability for DWC by
> reading registers. Anyway, if such capability enabled, TDM mode
> can be enabled and configured by dai-tdm-slot-* DT options.
> 
> Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>

Do we need some extra steps to upstream this patch?
Mark Brown July 3, 2023, 11:53 a.m. UTC | #2 
On Mon, Jul 03, 2023 at 09:16:06AM +0300, Maxim Kochetkov wrote:
> On 22.06.2023 23:00, Maxim Kochetkov wrote:
> > Depending on hardware implementaion of DWC I2S controller may support
> > TDM mode if enabled in SoC at design time.
> > Unfortunately there is no way to detect TDM capability for DWC by
> > reading registers. Anyway, if such capability enabled, TDM mode
> > can be enabled and configured by dai-tdm-slot-* DT options.

> Do we need some extra steps to upstream this patch?

We're in the merge window...

Please don't send content free pings and please allow a reasonable time
for review.  People get busy, go on holiday, attend conferences and so 
on so unless there is some reason for urgency (like critical bug fixes)
please allow at least a couple of weeks for review.  If there have been
review comments then people may be waiting for those to be addressed.

Sending content free pings adds to the mail volume (if they are seen at
all) which is often the problem and since they can't be reviewed
directly if something has gone wrong you'll have to resend the patches
anyway, so sending again is generally a better approach though there are
some other maintainers who like them - if in doubt look at how patches
for the subsystem are normally handled.
Mark Brown July 12, 2023, 11:46 a.m. UTC | #3 
On Thu, 22 Jun 2023 23:00:29 +0300, Maxim Kochetkov wrote:
> Depending on hardware implementaion of DWC I2S controller may support
> TDM mode if enabled in SoC at design time.
> Unfortunately there is no way to detect TDM capability for DWC by
> reading registers. Anyway, if such capability enabled, TDM mode
> can be enabled and configured by dai-tdm-slot-* DT options.
> 
> 
> [...]

Applied to

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

Thanks!

[1/1] ASoC: dwc: Add TDM mode support
      commit: 221acc16aee16eb246bad32a6b9014021218b7cd

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/dwc/dwc-i2s.c b/sound/soc/dwc/dwc-i2s.c
index 97d652f0e84d..1f1ee14b04e6 100644
--- a/sound/soc/dwc/dwc-i2s.c
+++ b/sound/soc/dwc/dwc-i2s.c
@@ -183,7 +183,15 @@  static void i2s_start(struct dw_i2s_dev *dev,
 {
 	struct i2s_clk_config_data *config = &dev->config;
 
-	i2s_write_reg(dev->i2s_base, IER, 1);
+	u32 reg = IER_IEN;
+
+	if (dev->tdm_slots) {
+		reg |= (dev->tdm_slots - 1) << IER_TDM_SLOTS_SHIFT;
+		reg |= IER_INTF_TYPE;
+		reg |= dev->frame_offset << IER_FRAME_OFF_SHIFT;
+	}
+
+	i2s_write_reg(dev->i2s_base, IER, reg);
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		i2s_write_reg(dev->i2s_base, ITER, 1);
@@ -233,13 +241,15 @@  static void dw_i2s_config(struct dw_i2s_dev *dev, int stream)
 				      dev->xfer_resolution);
 			i2s_write_reg(dev->i2s_base, TFCR(ch_reg),
 				      dev->fifo_th - 1);
-			i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
+			i2s_write_reg(dev->i2s_base, TER(ch_reg), TER_TXCHEN |
+				      dev->tdm_mask << TER_TXSLOT_SHIFT);
 		} else {
 			i2s_write_reg(dev->i2s_base, RCR(ch_reg),
 				      dev->xfer_resolution);
 			i2s_write_reg(dev->i2s_base, RFCR(ch_reg),
 				      dev->fifo_th - 1);
-			i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
+			i2s_write_reg(dev->i2s_base, RER(ch_reg), RER_RXCHEN |
+				      dev->tdm_mask << RER_RXSLOT_SHIFT);
 		}
 
 	}
@@ -276,6 +286,9 @@  static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 		return -EINVAL;
 	}
 
+	if (dev->tdm_slots)
+		config->data_width = 32;
+
 	config->chan_nr = params_channels(params);
 
 	switch (config->chan_nr) {
@@ -384,14 +397,58 @@  static int dw_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 		ret = -EINVAL;
 		break;
 	}
+
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+	case SND_SOC_DAIFMT_LEFT_J:
+	case SND_SOC_DAIFMT_RIGHT_J:
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		dev->frame_offset = 1;
+		break;
+	case SND_SOC_DAIFMT_DSP_B:
+		dev->frame_offset = 0;
+		break;
+	default:
+		dev_err(dev->dev, "DAI format unsupported");
+		return -EINVAL;
+	}
+
 	return ret;
 }
 
+static int dw_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai,	unsigned int tx_mask,
+			   unsigned int rx_mask, int slots, int slot_width)
+{
+	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
+
+	if (slot_width != 32)
+		return -EINVAL;
+
+	if (slots < 0 || slots > 16)
+		return -EINVAL;
+
+	if (rx_mask != tx_mask)
+		return -EINVAL;
+
+	if (!rx_mask)
+		return -EINVAL;
+
+	dev->tdm_slots = slots;
+	dev->tdm_mask = rx_mask;
+
+	dev->l_reg = RSLOT_TSLOT(ffs(rx_mask) - 1);
+	dev->r_reg = RSLOT_TSLOT(fls(rx_mask) - 1);
+
+	return 0;
+}
+
 static const struct snd_soc_dai_ops dw_i2s_dai_ops = {
 	.hw_params	= dw_i2s_hw_params,
 	.prepare	= dw_i2s_prepare,
 	.trigger	= dw_i2s_trigger,
 	.set_fmt	= dw_i2s_set_fmt,
+	.set_tdm_slot	= dw_i2s_set_tdm_slot,
 };
 
 #ifdef CONFIG_PM
@@ -726,6 +783,8 @@  static int dw_i2s_probe(struct platform_device *pdev)
 		if (irq >= 0) {
 			ret = dw_pcm_register(pdev);
 			dev->use_pio = true;
+			dev->l_reg = LRBR_LTHR(0);
+			dev->r_reg = RRBR_RTHR(0);
 		} else {
 			ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
 					0);
diff --git a/sound/soc/dwc/dwc-pcm.c b/sound/soc/dwc/dwc-pcm.c
index 9f25631d43d3..f99262b89008 100644
--- a/sound/soc/dwc/dwc-pcm.c
+++ b/sound/soc/dwc/dwc-pcm.c
@@ -31,8 +31,8 @@  static unsigned int dw_pcm_tx_##sample_bits(struct dw_i2s_dev *dev, \
 	int i; \
 \
 	for (i = 0; i < dev->fifo_th; i++) { \
-		iowrite32(p[tx_ptr][0], dev->i2s_base + LRBR_LTHR(0)); \
-		iowrite32(p[tx_ptr][1], dev->i2s_base + RRBR_RTHR(0)); \
+		iowrite32(p[tx_ptr][0], dev->i2s_base + dev->l_reg); \
+		iowrite32(p[tx_ptr][1], dev->i2s_base + dev->r_reg); \
 		period_pos++; \
 		if (++tx_ptr >= runtime->buffer_size) \
 			tx_ptr = 0; \
@@ -51,8 +51,8 @@  static unsigned int dw_pcm_rx_##sample_bits(struct dw_i2s_dev *dev, \
 	int i; \
 \
 	for (i = 0; i < dev->fifo_th; i++) { \
-		p[rx_ptr][0] = ioread32(dev->i2s_base + LRBR_LTHR(0)); \
-		p[rx_ptr][1] = ioread32(dev->i2s_base + RRBR_RTHR(0)); \
+		p[rx_ptr][0] = ioread32(dev->i2s_base + dev->l_reg); \
+		p[rx_ptr][1] = ioread32(dev->i2s_base + dev->r_reg); \
 		period_pos++; \
 		if (++rx_ptr >= runtime->buffer_size) \
 			rx_ptr = 0; \
diff --git a/sound/soc/dwc/local.h b/sound/soc/dwc/local.h
index ba4e397099be..4ce96bac2f39 100644
--- a/sound/soc/dwc/local.h
+++ b/sound/soc/dwc/local.h
@@ -25,6 +25,13 @@ 
 #define RXFFR		0x014
 #define TXFFR		0x018
 
+/* Enable register fields */
+#define IER_TDM_SLOTS_SHIFT	8
+#define IER_FRAME_OFF_SHIFT	5
+#define IER_FRAME_OFF	BIT(5)
+#define IER_INTF_TYPE	BIT(1)
+#define IER_IEN		BIT(0)
+
 /* Interrupt status register fields */
 #define ISR_TXFO	BIT(5)
 #define ISR_TXFE	BIT(4)
@@ -46,6 +53,15 @@ 
 #define TFCR(x)		(0x40 * x + 0x04C)
 #define RFF(x)		(0x40 * x + 0x050)
 #define TFF(x)		(0x40 * x + 0x054)
+#define RSLOT_TSLOT(x)	(0x4 * (x) + 0x224)
+
+/* Receive enable register fields */
+#define RER_RXSLOT_SHIFT	8
+#define RER_RXCHEN	BIT(0)
+
+/* Transmit enable register fields */
+#define TER_TXSLOT_SHIFT	8
+#define TER_TXCHEN	BIT(0)
 
 /* I2SCOMPRegisters */
 #define I2S_COMP_PARAM_2	0x01F0
@@ -105,6 +121,8 @@  struct dw_i2s_dev {
 	u32 ccr;
 	u32 xfer_resolution;
 	u32 fifo_th;
+	u32 l_reg;
+	u32 r_reg;
 
 	/* data related to DMA transfers b/w i2s and DMAC */
 	union dw_i2s_snd_dma_data play_dma_data;
@@ -114,6 +132,12 @@  struct dw_i2s_dev {
 
 	/* data related to PIO transfers */
 	bool use_pio;
+
+	/* data related to TDM mode */
+	u32 tdm_slots;
+	u32 tdm_mask;
+	u32 frame_offset;
+
 	struct snd_pcm_substream __rcu *tx_substream;
 	struct snd_pcm_substream __rcu *rx_substream;
 	unsigned int (*tx_fn)(struct dw_i2s_dev *dev,