linux-kernel - [PATCH 11/13] ASoC: ti: davinci-i2s: Add S24

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Date: Fri, 15 Mar 2024 12:27:43 +0100
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Peter Ujfalusi <peter.ujfalusi@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Bastien Curutchet <bastien.curutchet@...tlin.com>
Cc: linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	herve.codina@...tlin.com,
	christophercordahi@...ometrics.ca
Subject: [PATCH 11/13] ASoC: ti: davinci-i2s: Add S24_LE to supported formats

S24_LE is supported by McBSP but not by the driver.

Add S24_LE to driver's supported formats. Using it enables the sign
extension in DRR (Data Receive Register). The other formats are kept
with the zero extension in DRR.

Remove data_type table as it is no longer used.

Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
---
 sound/soc/ti/davinci-i2s.c | 34 +++++++++++++++++++++-------------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/sound/soc/ti/davinci-i2s.c b/sound/soc/ti/davinci-i2s.c
index 67307e75f2a8..13e349e7a6ec 100644
--- a/sound/soc/ti/davinci-i2s.c
+++ b/sound/soc/ti/davinci-i2s.c
@@ -61,6 +61,9 @@
 
 #define DAVINCI_MCBSP_SPCR_RRST		(1 << 0)
 #define DAVINCI_MCBSP_SPCR_RINTM(v)	((v) << 4)
+#define DAVINCI_MCBSP_SPCR_RJUST(v)	((v) << 13)
+#define DAVINCI_MCBSP_SPCR_RJUST_Z_LE	DAVINCI_MCBSP_SPCR_RJUST(0)
+#define DAVINCI_MCBSP_SPCR_RJUST_S_LE	DAVINCI_MCBSP_SPCR_RJUST(1)
 #define DAVINCI_MCBSP_SPCR_XRST		(1 << 16)
 #define DAVINCI_MCBSP_SPCR_XINTM(v)	((v) << 20)
 #define DAVINCI_MCBSP_SPCR_GRST		(1 << 22)
@@ -107,15 +110,10 @@ enum {
 	DAVINCI_MCBSP_WORD_32,
 };
 
-static const unsigned char data_type[SNDRV_PCM_FORMAT_S32_LE + 1] = {
-	[SNDRV_PCM_FORMAT_S8]		= 1,
-	[SNDRV_PCM_FORMAT_S16_LE]	= 2,
-	[SNDRV_PCM_FORMAT_S32_LE]	= 4,
-};
-
 static const unsigned char asp_word_length[SNDRV_PCM_FORMAT_S32_LE + 1] = {
 	[SNDRV_PCM_FORMAT_S8]		= DAVINCI_MCBSP_WORD_8,
 	[SNDRV_PCM_FORMAT_S16_LE]	= DAVINCI_MCBSP_WORD_16,
+	[SNDRV_PCM_FORMAT_S24_LE]	= DAVINCI_MCBSP_WORD_24,
 	[SNDRV_PCM_FORMAT_S32_LE]	= DAVINCI_MCBSP_WORD_32,
 };
 
@@ -443,8 +441,23 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 	snd_pcm_format_t fmt;
 	unsigned element_cnt = 1;
 
-	/* general line settings */
 	spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+
+	/* Determine xfer data type */
+	fmt = params_format(params);
+	switch (fmt) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+	case SNDRV_PCM_FORMAT_S32_LE:
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		spcr |= DAVINCI_MCBSP_SPCR_RJUST_S_LE;
+		break;
+	default:
+		dev_warn(dev->dev, "davinci-i2s: unsupported PCM format\n");
+		return -EINVAL;
+	}
+
+	/* general line settings */
 	if (dev->free_run)
 		spcr |= DAVINCI_MCBSP_SPCR_FREE;
 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
@@ -548,12 +561,6 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 		rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1);
 		xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1);
 	}
-	/* Determine xfer data type */
-	fmt = params_format(params);
-	if ((fmt > SNDRV_PCM_FORMAT_S32_LE) || !data_type[fmt]) {
-		printk(KERN_WARNING "davinci-i2s: unsupported PCM format\n");
-		return -EINVAL;
-	}
 
 	if (params_channels(params) == 2) {
 		element_cnt = 2;
@@ -692,6 +699,7 @@ static void davinci_i2s_shutdown(struct snd_pcm_substream *substream,
 
 #define DAVINCI_I2S_RATES	SNDRV_PCM_RATE_8000_96000
 #define DAVINCI_I2S_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
+				 SNDRV_PCM_FMTBIT_S24_LE | \
 				 SNDRV_PCM_FMTBIT_S32_LE)
 
 static int davinci_i2s_dai_probe(struct snd_soc_dai *dai)
-- 
2.43.2