Imx6 CAN wakes up Linux immediately

Technical Support
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1

Hi,

I can wake Linux up using UART by enabling its wakeup capability:

$ echo enabled > /sys/class/tty/ttymxc0/power/wakeup

I have put Linux into sleep using the following command:

 $ echo mem > /sys/power/state

then sending a character over UART when the Linux is in sleep to wake it up… This scenario works well.

I want to do the same with CAN, so I enable its wakeup capability:

 $ echo enabled > /sys/class/net/can0/device/power/wakeup

Then put Linux into sleep. It shows that Linux goes into sleep, but it immediately wakes up. I want Linux to be woken up upon the reception of a frame over CAN, just like the UART scenario

Hardware: apalis imx6D ixora v1.2

OS: Linux 5.4.91-33088-g8c05b31a44c3

Question: What could be the problem? How can I do that?

Thanks in advance

2

Could you please specify which can controller an Linux CAN driver you are using?

3

As stated in reference manual, it’s flexcan controller. The Linux driver is flexcan.c

4

What kind of hardware connected to Ixora CAN header (X30)? Are you sure it’s not generating a frame(s) which wake Apalis?

5

Hi,
The problem fixed by using Linux Source Code provided by NXP
https://source.codeaurora.org/external/imx/linux-imx/

6

Hi @Jonathan

Which linux branch from NXP did you use?