[RFC PATCH] ARM: dts: rockchip: increase the mclk_fs to 512 for kylin board

[RFC PATCH] ARM: dts: rockchip: increase the mclk_fs to 512 for kylin board

[Xing Zheng]

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@rock-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

[RFC PATCH] ARM: dts: rockchip: increase the mclk_fs to 512 for kylin board

[Heiko Stübner]

Am Freitag, 29. Januar 2016, 16:49:21 schrieb Xing Zheng:
> 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@rock-chips.com>

applied to my dts32 branch for 4.6


Thanks
Heiko