linux-kernel - [PATCH 09/13] ASoC: ti: davinci-i2s: Enable unexpected frame pulses detection

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Date: Fri, 15 Mar 2024 12:27:41 +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 09/13] ASoC: ti: davinci-i2s: Enable unexpected frame pulses detection

McBSP can generate an SYNCERR when unexpected frame pulses are
detected. The driver always disables this feature and ignore the
unexpected frame pulses.

Enable the generation of SYNCERR by the McBSP according to the
'ti,enable-sync-err' device-tree property.

Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
---
 sound/soc/ti/davinci-i2s.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/sound/soc/ti/davinci-i2s.c b/sound/soc/ti/davinci-i2s.c
index 7cdd86f47ead..2c19e45b6b54 100644
--- a/sound/soc/ti/davinci-i2s.c
+++ b/sound/soc/ti/davinci-i2s.c
@@ -163,6 +163,8 @@ struct davinci_mcbsp_dev {
 
 	int tdm_slots;
 	int slot_width;
+
+	bool sync_err;
 };
 
 static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
@@ -432,8 +434,10 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 	struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
 	struct snd_interval *i = NULL;
 	int mcbsp_word_length, master;
-	unsigned int rcr, xcr, clk_div, freq, framesize;
+	unsigned int clk_div, freq, framesize;
 	unsigned int srgr = 0;
+	unsigned int rcr = 0;
+	unsigned int xcr = 0;
 	u32 spcr;
 	snd_pcm_format_t fmt;
 	unsigned element_cnt = 1;
@@ -530,8 +534,10 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 	}
 	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
 
-	rcr = DAVINCI_MCBSP_RCR_RFIG;
-	xcr = DAVINCI_MCBSP_XCR_XFIG;
+	if (!dev->sync_err) {
+		rcr |= DAVINCI_MCBSP_RCR_RFIG;
+		xcr |= DAVINCI_MCBSP_XCR_XFIG;
+	}
 	if (dev->mode == MOD_DSP_B) {
 		rcr |= DAVINCI_MCBSP_RCR_RDATDLY(0);
 		xcr |= DAVINCI_MCBSP_XCR_XDATDLY(0);
@@ -760,6 +766,8 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 
 	dev->base = io_base;
 
+	dev->sync_err = of_property_read_bool(pdev->dev.of_node, "ti,enable-sync-err");
+
 	/* setup DMA, first TX, then RX */
 	dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
 	dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
-- 
2.43.2