linux-kernel - [PATCH AUTOSEL 6.6 12/47] ASoC: fsl_xcvr: Enable 2 * TX bit clock for spdif only case

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Date:   Mon, 11 Dec 2023 08:50:13 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, shengjiu.wang@...il.com,
        Xiubo.Lee@...il.com, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org, linux-sound@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 12/47] ASoC: fsl_xcvr: Enable 2 * TX bit clock for spdif only case

From: Shengjiu Wang <shengjiu.wang@....com>

[ Upstream commit c33fd110424dfcb544cf55a1b312f43fe1918235 ]

The bit 10 in TX_DPTH_CTRL register controls the TX clock rate.
If this bit is set, TX datapath clock should be = 2* TX bit rate.
If this bit is not set, TX datapath clock should be 10* TX bit rate.

As the spdif only case, we always use 2 * TX bit clock, so
this bit need to be set.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
Link: https://lore.kernel.org/r/1700617373-6472-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/fsl/fsl_xcvr.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c
index fa0a15263c66d..77f8e2394bf93 100644
--- a/sound/soc/fsl/fsl_xcvr.c
+++ b/sound/soc/fsl/fsl_xcvr.c
@@ -414,6 +414,16 @@ static int fsl_xcvr_prepare(struct snd_pcm_substream *substream,
 
 	switch (xcvr->mode) {
 	case FSL_XCVR_MODE_SPDIF:
+		if (xcvr->soc_data->spdif_only && tx) {
+			ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_TX_DPTH_CTRL_SET,
+						 FSL_XCVR_TX_DPTH_CTRL_BYPASS_FEM,
+						 FSL_XCVR_TX_DPTH_CTRL_BYPASS_FEM);
+			if (ret < 0) {
+				dev_err(dai->dev, "Failed to set bypass fem: %d\n", ret);
+				return ret;
+			}
+		}
+		fallthrough;
 	case FSL_XCVR_MODE_ARC:
 		if (tx) {
 			ret = fsl_xcvr_en_aud_pll(xcvr, fout);
-- 
2.42.0