AM62A7: if mcu use main gpio, and open gpio irq then a53 linux can use main gpio irq ?

soso soso

Prodigy 150 points

Part Number: AM62A7

if mcu use main_gpio0_1, and use the main_gpio0_1 irq then a53 linux can use main_gpio0_3 irq ?

this question from this:

when in tda4, we found when mcu2_0 use wake_gpio irq, the linux we probe wake_gpio fail.

over 1 year ago

0 Bin Liu over 1 year ago

TI__Guru**** 156411 points

Hi,

soso soso said:

if mcu use main_gpio0_1, and use the main_gpio0_1 irq then a53 linux can use main_gpio0_3 irq ?

No, the same GPIO module cannot be shared between Linux and other OS.

0 soso soso over 1 year ago in reply to Bin Liu

Prodigy 150 points

if mcu just use main_gpio0_1 to output 1 or 0, no irq, then a53 linux can use main_gpio0_3 irq ?

0 Bin Liu over 1 year ago in reply to soso soso

TI__Guru**** 156411 points

Hi,

No.

main_gpio0_1 and main_gpio0_3 are controlled by a same group of registers. MCU and A53 accessing the same register to control gpio0_1 and gpio0_3 simultaneously causes race condition.

0 soso soso over 1 year ago in reply to Bin Liu

Prodigy 150 points

for example, main_gpio0_1 in register A bit1, main_gpio0_3 in register A bit3;

mcu read A to mcu_tmp

A53 read A to A53_tmp

mcu modify bit1 in mcu_tmp and write to A

A53 modify bit3 in A53_tmp and write to A

then the A setting of mcu will be overlay by a53.

if we can avoid the scene, is OK ?

+1 Bin Liu over 1 year ago in reply to soso soso

TI__Guru**** 156411 points

Yes, this scenario is the race condition I meant. I am not sure how you can avoid it. There is no register access synchronization between A53 and mcu core.

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AM62A7: if mcu use main gpio, and open gpio irq then a53 linux can use main gpio irq ?