1 files changed, 85 insertions, 0 deletions

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 1c53719bb61e..d178b479c8bd 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -111,6 +111,7 @@ struct spdif_mixer_control {
  * @dma_params_tx: DMA parameters for transmit channel
  * @dma_params_rx: DMA parameters for receive channel
  * @regcache_srpc: regcache for SRPC
+ * @bypass: status of bypass input to output
  */
 struct fsl_spdif_priv {
 	const struct fsl_spdif_soc_data *soc;
@@ -133,6 +134,7 @@ struct fsl_spdif_priv {
 	struct snd_dmaengine_dai_dma_data dma_params_rx;
 	/* regcache for SRPC */
 	u32 regcache_srpc;
+	bool bypass;
 };
 
 static struct fsl_spdif_soc_data fsl_spdif_vf610 = {
@@ -186,6 +188,16 @@ static struct fsl_spdif_soc_data fsl_spdif_imx8mm = {
 	.tx_formats = FSL_SPDIF_FORMATS_PLAYBACK,
 };
 
+static struct fsl_spdif_soc_data fsl_spdif_imx8ulp = {
+	.imx = true,
+	.shared_root_clock = true,
+	.raw_capture_mode = false,
+	.interrupts = 1,
+	.tx_burst = 2,		/* Applied for EDMA */
+	.rx_burst = 2,		/* Applied for EDMA */
+	.tx_formats = SNDRV_PCM_FMTBIT_S24_LE,	/* Applied for EDMA */
+};
+
 /* Check if clk is a root clock that does not share clock source with others */
 static inline bool fsl_spdif_can_set_clk_rate(struct fsl_spdif_priv *spdif, int clk)
 {
@@ -895,6 +907,69 @@ static int fsl_spdif_rx_rcm_put(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
+static int fsl_spdif_bypass_get(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+	struct fsl_spdif_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+	ucontrol->value.integer.value[0] = priv->bypass ? 1 : 0;
+
+	return 0;
+}
+
+static int fsl_spdif_bypass_put(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+	struct fsl_spdif_priv *priv = snd_soc_dai_get_drvdata(dai);
+	struct snd_soc_card *card = dai->component->card;
+	bool set = (ucontrol->value.integer.value[0] != 0);
+	struct regmap *regmap = priv->regmap;
+	struct snd_soc_pcm_runtime *rtd;
+	u32 scr, mask;
+	int stream;
+
+	rtd = snd_soc_get_pcm_runtime(card, card->dai_link);
+
+	if (priv->bypass == set)
+		return 0; /* nothing to do */
+
+	if (snd_soc_dai_active(dai)) {
+		dev_err(dai->dev, "Cannot change BYPASS mode while stream is running.\n");
+		return -EBUSY;
+	}
+
+	pm_runtime_get_sync(dai->dev);
+
+	if (set) {
+		/* Disable interrupts */
+		regmap_update_bits(regmap, REG_SPDIF_SIE, 0xffffff, 0);
+
+		/* Configure BYPASS mode */
+		scr = SCR_TXSEL_RX | SCR_RXFIFO_OFF;
+		mask = SCR_RXFIFO_FSEL_MASK | SCR_RXFIFO_AUTOSYNC_MASK |
+			SCR_RXFIFO_CTL_MASK | SCR_RXFIFO_OFF_MASK | SCR_TXSEL_MASK;
+		/* Power up SPDIF module */
+		mask |= SCR_LOW_POWER;
+	} else {
+		/* Power down SPDIF module, disable TX */
+		scr = SCR_LOW_POWER | SCR_TXSEL_OFF;
+		mask = SCR_LOW_POWER | SCR_TXSEL_MASK;
+	}
+
+	regmap_update_bits(regmap, REG_SPDIF_SCR, mask, scr);
+
+	/* Disable playback & capture if BYPASS mode is enabled, enable otherwise */
+	for_each_pcm_streams(stream)
+		rtd->pcm->streams[stream].substream_count = (set ? 0 : 1);
+
+	priv->bypass = set;
+	pm_runtime_put_sync(dai->dev);
+
+	return 0;
+}
+
 /* DPLL lock information */
 static int fsl_spdif_rxrate_info(struct snd_kcontrol *kcontrol,
 				struct snd_ctl_elem_info *uinfo)
@@ -1065,6 +1140,15 @@ static struct snd_kcontrol_new fsl_spdif_ctrls[] = {
 		.info = fsl_spdif_rxrate_info,
 		.get = fsl_spdif_rxrate_get,
 	},
+	/* RX bypass controller */
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "Bypass Mode",
+		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+		.info = snd_ctl_boolean_mono_info,
+		.get = fsl_spdif_bypass_get,
+		.put = fsl_spdif_bypass_put,
+	},
 	/* User bit sync mode set/get controller */
 	{
 		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
@@ -1560,6 +1644,7 @@ static const struct of_device_id fsl_spdif_dt_ids[] = {
 	{ .compatible = "fsl,imx6sx-spdif", .data = &fsl_spdif_imx6sx, },
 	{ .compatible = "fsl,imx8qm-spdif", .data = &fsl_spdif_imx8qm, },
 	{ .compatible = "fsl,imx8mm-spdif", .data = &fsl_spdif_imx8mm, },
+	{ .compatible = "fsl,imx8ulp-spdif", .data = &fsl_spdif_imx8ulp, },
 	{}
 };
 MODULE_DEVICE_TABLE(of, fsl_spdif_dt_ids);