topic Re: Power-on latency exceeded in i.MX Processors

Power-on latency exceeded

jamesmin — Fri, 11 Dec 2015 01:22:01 GMT

I got following warning message from the kernel a few times per hours at random during operation.

PU: Power-on latency exceeded, new value 64083334 ns

The "new value" varies each time. I don't think it would be a big problem, but I want to get rid of it in the first place thinking by giving proper initial value.

The chipset is iMX6Q and the dts have like below.

gpc: gpc@020dc000 {

compatible = "fsl,imx6q-gpc";

reg = <0x020dc000 0x4000>;

interrupts = <0 89 IRQ_TYPE_LEVEL_HIGH>,

<0 90 IRQ_TYPE_LEVEL_HIGH>;

pu-supply = <&reg_pu>;

clocks = <&clks IMX6QDL_CLK_GPU3D_CORE>,

<&clks IMX6QDL_CLK_GPU3D_SHADER>,

<&clks IMX6QDL_CLK_GPU2D_CORE>,

<&clks IMX6QDL_CLK_GPU2D_AXI>,

<&clks IMX6QDL_CLK_OPENVG_AXI>,

<&clks IMX6QDL_CLK_VPU_AXI>;

#power-domain-cells = <1>;

};

Is there any way to get rid of the message?

Re: Power-on latency exceeded

igorpadykov — Fri, 11 Dec 2015 10:54:41 GMT

Hi James

one can try below patch

[PATCH v2 4/7] ARM: imx6: gpc: Add observed worst case latencies -- Linux Device Tree

Best regards

igor

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Re: Power-on latency exceeded

jamesmin — Mon, 14 Dec 2015 03:57:03 GMT

Hi igor,

Thank you for the reply.

But the patch was a bit old, so I can't use for my 3.14.28 kernel.

I assume this warning message is not critical because my application is working for now.

But if you find any other sugguestion, it would be appreciated.

James.

Re: Power-on latency exceeded

juliocruz — Thu, 21 Jan 2016 05:32:06 GMT

Hi James, Igor,

You got any news about this issue?

Thanks

Re: Power-on latency exceeded

veeranjaneyulug — Mon, 09 May 2016 04:44:49 GMT

I also face with same issue .while running my streaming application on target board.can any body solve that issue .we are using kernel 3.14.28 version.

Re: Power-on latency exceeded

1282497337 — Thu, 27 Dec 2018 12:35:35 GMT

hi james:
I also encounter this problem , and i want to know what's cause this problem, our kernel version is 3.14.52
thx.
Alee