SCU fails to wake up core A

[xiuqi_huang]

Hi，

when I use scu to wakeup A core from KS1 mode, it failed.

Here are my steps to suspend and resume the system:

1、Use "echo mem > sys/power/state" to put A core into the KS1 mode

      The following are the resources when the A core is in KS1 mode

2、Wake up A core through SC_R_BOARD_R0

  I made the following modifications to board_set_control in the board.c file in SCFW

when I trigger the wakeup source, I can find this log "set A core on from KS1" in the SCU console log, which means the ss_irq_trigger has been executed. But actually the A core did not wake up.

only the following resources are awakened 

Partition: 0 = on
SC_PID0 = on
SC_TPM = on
SC_PIT = on
SC_UART = on
SC_I2C = on
SC_MU_0B = on
SC_MU_1A = on
SYSCNT_RD = on
SYSCNT_CMP = on
DEBUG = on
OTP = on
DB = on
DBLOGIC = on
DRC_0 = on
DRC_1 = on
Partition: 1 = on
CAAM_JR3 = on
CAAM_JR3_OUT = on
Partition: 2 = on
SECO = on
Partition: 3 = on
Partition: 4 = on
M4_1_PID0 = on
M4_1_UART = on
M4_1_MU_1A = on
SPI_0 = on
SPI_2 = on
SPI_3 = on
CAN_0 = on
CAN_1 = on
CAN_2 = on
IRQSTR_M4_1 = on
GPIO_0 = on
GPIO_2 = on
GPIO_4 = on
GPT_3 = on
MU_5B = on
MU_6B = on
MU_7B = on
MU_9B = on
MU_12B = on
BOARD_R0 = on
Partition: 5 = on
Partition: 6 = on
ENET_1 = lp
SMMU = on
OCRAM = on

A core can be woken up if I use uart as a wakeup resource

Any help would be appreciated.

Huang

[jimmychan]

Could you tell me which processor are you using?

[xiuqi_huang]

I'm using IMX8 QM

[jimmychan]

I got the reply from the AE

==============

Please check with customer, how did they enter board_set_control() function in the wakeup process?

==============

[xiuqi_huang]

Hi jimmy,

Here's how I get into the board_set_control() function:

1、Divide the SC_R_BOARD_R0 resource to M4 core, which is partition 4

2、In M4 , use the API sc_misc_set_control()

      if(sc_misc_set_control(ipc, SC_R_BOARD_R0, 0, 0) != SC_ERR_NONE){

             PRINTF_I(KERN_ERR "try to wakeup linux partition faile!\r\n");
      } else {
             PRINTF_I(KERN_ERR "try to wakeup linux partition!\r\n");
      }

      After I trigger the wakeup source I can find the log "try to wakeup linux partition"  in the M4 console log. And in the SCU console log, as I posted before, resources in partition 4 have been woke up.

[jimmychan · Accepted solution]

Hello,

More question from the expert.

1. Are you using MEK board or your own board?

2. If you are using MEK board, can you wakeup Linux by pressing ON_OFF_BUTTON after Linux suspend?

3. Do you have following device node in dts:

    sc_pwrkey: sc-powerkey {
        compatible = "fsl,imx8-pwrkey";
        linux,keycode = <KEY_POWER>;
        wakeup-source;
    };

[xiuqi_huang]

Hi,

I'm using my own board with ON_OFF_BUTTON , I have those device nodes in my dts, but somehow it was disabled. when I make it okay, my board can resume from the suspend state, so thank you very much！

[jimmychan]

I will check this with the internal team. And then let you know when I get the reply.