Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Shengjiu Wang <shengjiu.wang@nxp.com>
To:     timur@kernel.org, nicoleotsuka@gmail.com, Xiubo.Lee@gmail.com,
        festevam@gmail.com, broonie@kernel.org,
        alsa-devel@alsa-project.org, lgirdwood@gmail.com, perex@perex.cz,
        tiwai@suse.com
Cc:     linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH] ASoC: fsl_asrc: Set ASR76K and ASR56K based on processing clock
Date:   Tue, 12 May 2020 18:22:59 +0800
Message-Id: <1589278979-31008-1-git-send-email-shengjiu.wang@nxp.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The processing clock is different for platforms, so it is better
to set ASR76K and ASR56K based on processing clock, rather than
hard coding the value for them.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Mihai Serban <mihai.serban@nxp.com>
---
 sound/soc/fsl/fsl_asrc.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c
index 067a54ab554f..ca926915068f 100644
--- a/sound/soc/fsl/fsl_asrc.c
+++ b/sound/soc/fsl/fsl_asrc.c
@@ -858,6 +858,8 @@ static const struct regmap_config fsl_asrc_regmap_config = {
  */
 static int fsl_asrc_init(struct fsl_asrc *asrc)
 {
+	unsigned long ipg_rate;
+
 	/* Halt ASRC internal FP when input FIFO needs data for pair A, B, C */
 	regmap_write(asrc->regmap, REG_ASRCTR, ASRCTR_ASRCEN);
 
@@ -875,11 +877,14 @@ static int fsl_asrc_init(struct fsl_asrc *asrc)
 	regmap_update_bits(asrc->regmap, REG_ASRTFR1,
 			   ASRTFR1_TF_BASE_MASK, ASRTFR1_TF_BASE(0xfc));
 
-	/* Set the processing clock for 76KHz to 133M */
-	regmap_write(asrc->regmap, REG_ASR76K, 0x06D6);
-
-	/* Set the processing clock for 56KHz to 133M */
-	return regmap_write(asrc->regmap, REG_ASR56K, 0x0947);
+	/*
+	 * Set the period of the 76KHz and 56KHz sampling clocks based on
+	 * the ASRC processing clock.
+	 * On iMX6, ipg_clk = 133MHz, REG_ASR76K = 0x06D6, REG_ASR56K = 0x0947
+	 */
+	ipg_rate = clk_get_rate(asrc->ipg_clk);
+	regmap_write(asrc->regmap, REG_ASR76K, ipg_rate / 76000);
+	return regmap_write(asrc->regmap, REG_ASR56K, ipg_rate / 56000);
 }
 
 /**
-- 
2.21.0