[PATCH] ASoC: ak4458: enable daisy chain

[PATCH] ASoC: ak4458: enable daisy chain

[Shengjiu Wang]

From: Viorel Suman <viorel.suman@nxp.com>

Enable Daisy Chain if in TDM mode and the number of played
channels is bigger than the maximum supported number of channels.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/codecs/ak4458.c | 47 ++++++++++++++++++++++++++-------------
 sound/soc/codecs/ak4458.h |  1 +
 2 files changed, 32 insertions(+), 16 deletions(-)

diff --git a/sound/soc/codecs/ak4458.c b/sound/soc/codecs/ak4458.c
index 3088128816bb..29eb78702bf3 100644
--- a/sound/soc/codecs/ak4458.c
+++ b/sound/soc/codecs/ak4458.c
@@ -306,6 +306,20 @@ static const struct snd_soc_dapm_route ak4497_intercon[] = {
 
 };
 
+static int ak4458_get_tdm_mode(struct ak4458_priv *ak4458)
+{
+	switch (ak4458->slots * ak4458->slot_width) {
+	case 128:
+		return 1;
+	case 256:
+		return 2;
+	case 512:
+		return 3;
+	default:
+		return 0;
+	}
+}
+
 static int ak4458_rstn_control(struct snd_soc_component *component, int bit)
 {
 	int ret;
@@ -333,13 +347,16 @@ static int ak4458_hw_params(struct snd_pcm_substream *substream,
 	struct snd_soc_component *component = dai->component;
 	struct ak4458_priv *ak4458 = snd_soc_component_get_drvdata(component);
 	int pcm_width = max(params_physical_width(params), ak4458->slot_width);
-	u8 format, dsdsel0, dsdsel1;
-	int nfs1, dsd_bclk, ret;
+	u8 format, dsdsel0, dsdsel1, dchn;
+	int nfs1, dsd_bclk, ret, channels, channels_max;
 
 	nfs1 = params_rate(params);
 	ak4458->fs = nfs1;
 
 	/* calculate bit clock */
+	channels = params_channels(params);
+	channels_max = dai->driver->playback.channels_max;
+
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_DSD_U8:
 	case SNDRV_PCM_FORMAT_DSD_U16_LE:
@@ -419,6 +436,17 @@ static int ak4458_hw_params(struct snd_pcm_substream *substream,
 	snd_soc_component_update_bits(component, AK4458_00_CONTROL1,
 			    AK4458_DIF_MASK, format);
 
+	/*
+	 * Enable/disable Daisy Chain if in TDM mode and the number of played
+	 * channels is bigger than the maximum supported number of channels
+	 */
+	dchn = ak4458_get_tdm_mode(ak4458) &&
+		(ak4458->fmt == SND_SOC_DAIFMT_DSP_B) &&
+		(channels > channels_max) ? AK4458_DCHAIN_MASK : 0;
+
+	snd_soc_component_update_bits(component, AK4458_0B_CONTROL7,
+				      AK4458_DCHAIN_MASK, dchn);
+
 	ret = ak4458_rstn_control(component, 0);
 	if (ret)
 		return ret;
@@ -519,20 +547,7 @@ static int ak4458_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
 	ak4458->slots = slots;
 	ak4458->slot_width = slot_width;
 
-	switch (slots * slot_width) {
-	case 128:
-		mode = AK4458_MODE_TDM128;
-		break;
-	case 256:
-		mode = AK4458_MODE_TDM256;
-		break;
-	case 512:
-		mode = AK4458_MODE_TDM512;
-		break;
-	default:
-		mode = AK4458_MODE_NORMAL;
-		break;
-	}
+	mode = ak4458_get_tdm_mode(ak4458) << AK4458_MODE_SHIFT;
 
 	snd_soc_component_update_bits(component, AK4458_0A_CONTROL6,
 			    AK4458_MODE_MASK,
diff --git a/sound/soc/codecs/ak4458.h b/sound/soc/codecs/ak4458.h
index 9548c5d78621..9ad869575f8d 100644
--- a/sound/soc/codecs/ak4458.h
+++ b/sound/soc/codecs/ak4458.h
@@ -82,6 +82,7 @@
  * */
 #define AK4458_ATS_SHIFT	6
 #define AK4458_ATS_MASK		GENMASK(7, 6)
+#define AK4458_DCHAIN_MASK	(0x1 << 1)
 
 #define AK4458_DSDSEL_MASK		(0x1 << 0)
 #define AK4458_DP_MASK			(0x1 << 7)
-- 
2.27.0

Re: [PATCH] ASoC: ak4458: enable daisy chain

[Mark Brown]

On Tue, 20 Apr 2021 18:44:13 +0800, Shengjiu Wang wrote:
> Enable Daisy Chain if in TDM mode and the number of played
> channels is bigger than the maximum supported number of channels.

Applied to

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

Thanks!

[1/1] ASoC: ak4458: enable daisy chain
      commit: 7342db3cddcd1d8ff54f4dff8c942e04232f1d6d

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