linux-kernel - [PATCH 6/9] ASoC: ssm2602: Add support for CLKDIV2

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Date:   Fri, 14 Apr 2023 16:02:00 +0200
From:   Paweł Anikiel <pan@...ihalf.com>
To:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, lgirdwood@...il.com,
        broonie@...nel.org
Cc:     perex@...ex.cz, tiwai@...e.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, dinguyen@...nel.org,
        lars@...afoo.de, nuno.sa@...log.com, upstream@...ihalf.com,
        Paweł Anikiel <pan@...ihalf.com>
Subject: [PATCH 6/9] ASoC: ssm2602: Add support for CLKDIV2

The SSM260x chips have an internal MCLK /2 divider (bit D7 in register
R8). Add logic that allows for more MCLK values using this divider.

Signed-off-by: Paweł Anikiel <pan@...ihalf.com>
---
 sound/soc/codecs/ssm2602.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/ssm2602.c b/sound/soc/codecs/ssm2602.c
index 021e0c860fa1..35c4743e756e 100644
--- a/sound/soc/codecs/ssm2602.c
+++ b/sound/soc/codecs/ssm2602.c
@@ -280,9 +280,12 @@ static inline int ssm2602_get_coeff(int mclk, int rate)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(ssm2602_coeff_table); i++) {
-		if (ssm2602_coeff_table[i].rate == rate &&
-			ssm2602_coeff_table[i].mclk == mclk)
-			return ssm2602_coeff_table[i].srate;
+		if (ssm2602_coeff_table[i].rate == rate) {
+			if (ssm2602_coeff_table[i].mclk == mclk)
+				return ssm2602_coeff_table[i].srate;
+			if (ssm2602_coeff_table[i].mclk == mclk / 2)
+				return ssm2602_coeff_table[i].srate | SRATE_CORECLK_DIV2;
+		}
 	}
 	return -EINVAL;
 }
@@ -365,18 +368,24 @@ static int ssm2602_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 		switch (freq) {
 		case 12288000:
 		case 18432000:
+		case 24576000:
+		case 36864000:
 			ssm2602->sysclk_constraints = &ssm2602_constraints_12288000;
 			break;
 		case 11289600:
 		case 16934400:
+		case 22579200:
+		case 33868800:
 			ssm2602->sysclk_constraints = &ssm2602_constraints_11289600;
 			break;
 		case 12000000:
+		case 24000000:
 			ssm2602->sysclk_constraints = NULL;
 			break;
 		default:
 			return -EINVAL;
 		}
+
 		ssm2602->sysclk = freq;
 	} else {
 		unsigned int mask;
-- 
2.40.0.634.g4ca3ef3211-goog