From: zhangjun <zhangjun@rock-chips.com>
Date: Tue, 17 Jan 2017 07:53:40 +0000 (+0800)
Subject: ASoC: codec cx2072x will only use mclk 12.288M
X-Git-Tag: firefly_0821_release~731
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=756733c3abfbd21698f37d1254a4fb1fe3cfcfcf;p=firefly-linux-kernel-4.4.55.git

ASoC: codec cx2072x will only use mclk 12.288M

1. due to cx2072x only support playback samplerate 48K
2. set_clk_rate called from codec side will make the clock
   tree correct, otherwise mclk will be closed from
   i2s_runtime_suspend unexpected

Change-Id: Iaa748bb27635e21f7c2d2997823228cdf7308fe8
Signed-off-by: zhangjun <zhangjun@rock-chips.com>
---

diff --git a/sound/soc/codecs/cx2072x.c b/sound/soc/codecs/cx2072x.c
index 6921ccfcda18..da54f1d4a528 100644
--- a/sound/soc/codecs/cx2072x.c
+++ b/sound/soc/codecs/cx2072x.c
@@ -1779,9 +1779,17 @@ static int cx2072x_probe(struct snd_soc_codec *codec)
 	if (PTR_ERR(cx2072x->mclk_clock) == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
 
+	ret = clk_set_rate(cx2072x->mclk_clock, CX2072X_RATES_MCLK);
+	if (ret) {
+		dev_err(codec->dev, "clk_set_rate is fail!\n");
+		return ret;
+	}
+
 	ret = clk_prepare_enable(cx2072x->mclk_clock);
-	if (ret)
+	if (ret) {
 		dev_err(codec->dev, "clk_prepare_enable is fail!\n");
+		return ret;
+	}
 
 	dev_dbg(codec->dev, "codec version: 4.4.20\n");
 	regmap_read(cx2072x->regmap, CX2072X_VENDOR_ID, &ven_id);
diff --git a/sound/soc/codecs/cx2072x.h b/sound/soc/codecs/cx2072x.h
index 8dcea850ca2c..cf3205a1ec08 100644
--- a/sound/soc/codecs/cx2072x.h
+++ b/sound/soc/codecs/cx2072x.h
@@ -18,6 +18,7 @@
 
 #define CX2072X_RATES		SNDRV_PCM_RATE_8000_192000
 #define CX2072X_RATES_DSP	SNDRV_PCM_RATE_48000
+#define CX2072X_RATES_MCLK	12288000
 
 #define CX2072X_REG_MAX 0x8a3c
 #define AUDDRV_VERSION(major0, major1, minor, build) \