linux-kernel - [PATCH] ASoC: atmel: Fix the 8K sample parameter in I2SC master

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Message-Id: <20230715030620.62328-1-aarongt.shen@gmail.com>
Date:   Sat, 15 Jul 2023 11:06:20 +0800
From:   Guiting Shen <aarongt.shen@...il.com>
To:     codrin.ciubotariu@...rochip.com
Cc:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, claudiu.beznea@...rochip.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Guiting Shen <aarongt.shen@...il.com>
Subject: [PATCH] ASoC: atmel: Fix the 8K sample parameter in I2SC master

The 8K sample parameter of 12.288Mhz main system bus clock doesn't work
because the I2SC_MR.IMCKDIV must not be 0 according to the sama5d2
series datasheet(I2SC Mode Register of Register Summary).

So use the 6.144Mhz instead of 12.288Mhz to support 8K sample.

Signed-off-by: Guiting Shen <aarongt.shen@...il.com>
---
 sound/soc/atmel/atmel-i2s.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/atmel/atmel-i2s.c b/sound/soc/atmel/atmel-i2s.c
index 425d66edbf86..5e43ff0b537a 100644
--- a/sound/soc/atmel/atmel-i2s.c
+++ b/sound/soc/atmel/atmel-i2s.c
@@ -163,11 +163,14 @@ struct atmel_i2s_gck_param {
 
 #define I2S_MCK_12M288		12288000UL
 #define I2S_MCK_11M2896		11289600UL
+#define I2S_MCK_6M144		6144000UL
 
 /* mck = (32 * (imckfs+1) / (imckdiv+1)) * fs */
 static const struct atmel_i2s_gck_param gck_params[] = {
+	/* mck = 6.144Mhz */
+	{  8000, I2S_MCK_6M144,  1, 47},	/* mck =  768 fs */
+
 	/* mck = 12.288MHz */
-	{  8000, I2S_MCK_12M288, 0, 47},	/* mck = 1536 fs */
 	{ 16000, I2S_MCK_12M288, 1, 47},	/* mck =  768 fs */
 	{ 24000, I2S_MCK_12M288, 3, 63},	/* mck =  512 fs */
 	{ 32000, I2S_MCK_12M288, 3, 47},	/* mck =  384 fs */
-- 
2.25.1