On 07/07/2014 09:14 PM, Guenter Roeck wrote:
Are you sure this did not just happen when you booted the new kernel
for the first time ? I have seen similar behavior with some distributions.
I did some more tries and found out that I had disabled some of my
patches until I reached 3.15.4 (latest version) where I decided to do
needed modifications to get my patches back in.
I tracked the problem down to the following patch:
diff --git a/arch/arm/boot/dts/imx23-olinuxino.dts
b/arch/arm/boot/dts/imx23-olinuxino.dts
index d107c4a..993da2e 100644
--- a/arch/arm/boot/dts/imx23-olinuxino.dts
+++ b/arch/arm/boot/dts/imx23-olinuxino.dts
@@ -64,7 +64,14 @@
compatible = "fsl,imx23-spi";
pinctrl-names = "default";
pinctrl-0 = <&spi2_pins_a>;
+ clock-frequency = <1000000>;
status = "okay";
+
+ spidev0: spidev@0 {
+ compatible = "spidev";
+ spi-max-frequency = <1000000>;
+ reg = <0>;
+ };
};
};
I need this to add spidev support. But I don't understand why this
change kills performance? Maybe the "high" value in "clock-frequency"?
Can someone give me some information on how to fix this?
Thank you very much in advance.
Greetings,
Manuel
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