On Thu, Apr 30, 2020 at 01:11:06PM +0200, Tomek The Messenger wrote:
Hi If I don't have disabled irqs I can use API i2c_smbus_write_byte in order to perform i2c transaction. But how to make i2c transaction if I have disabled irq? Is any built-in function which lets such operation, where there is some polling implemented? The background is that I do i2c transaction in restart handler (some i2c transaction to hot swap controller) in order to reset board. And linux before entering restart handler list disable interrupts. There is a function to enable back interrupts but in company in which I am working engineers reviewed it and said "it is not allowed, restart must be performed when interrupts are disabled".
Ask the engineers how you are supposed to use an interrupt driven device with interrupts disabled. good luck! greg k-h