linux-kernel - [RFC PATCH] ARM: dts: rockchip: increase the mclk

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Date:	Fri, 29 Jan 2016 16:49:21 +0800
From:	Xing Zheng <zhengxing@...k-chips.com>
To:	linux-rockchip@...ts.infradead.org
Cc:	keescook@...gle.com, leozwang@...gle.com, heiko@...ech.de,
	Xing Zheng <zhengxing@...k-chips.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH] ARM: dts: rockchip: increase the mclk_fs to 512 for kylin board

If we playback the 8KHz FS audio with the 256 mclk_fs, we need the
mclk = 256 * 8000 = 2.048MHz, the frac div is 594 / 2.048 = 290,
the frac div value 0x00809015 set to the CRU_CLKSEL7_CON will cause
to hang.

We increase the mclk_fs to 512, will get the mclk = 512 * 8000 =
4.096MHz, use 0x01009015 instead of 0x00809015 to work around this
issue. We will keep tracking it.

Signed-off-by: Xing Zheng <zhengxing@...k-chips.com>
---

 arch/arm/boot/dts/rk3036-kylin.dts |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/rk3036-kylin.dts b/arch/arm/boot/dts/rk3036-kylin.dts
index 190f22c..be468f9 100644
--- a/arch/arm/boot/dts/rk3036-kylin.dts
+++ b/arch/arm/boot/dts/rk3036-kylin.dts
@@ -67,7 +67,7 @@
 		compatible = "simple-audio-card";
 		simple-audio-card,format = "i2s";
 		simple-audio-card,name = "rockchip,rt5616-codec";
-		simple-audio-card,mclk-fs = <256>;
+		simple-audio-card,mclk-fs = <512>;
 		simple-audio-card,widgets =
 			"Microphone", "Microphone Jack",
 			"Headphone", "Headphone Jack";
-- 
1.7.9.5