Power-on latency exceeded

[jamesmin]

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?

[1282497337]

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 

[veeranjaneyulug]

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.

[igorpadykov]

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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[jamesmin]

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.

[juliocruz]

Hi James, Igor,

You got any news about this issue?

Thanks