Hi,
after I solved the startup problem I could now investigate another
thing.
>From time to time, I have problems with some drivers (namely QSPI
in interrupt mode and my self-hacked I2C driver in interrupt mode)
getting stuck when sleeping on a waitqueue. This happens on an
MCF5373L, using the code for MCF532x as they are compatible except
the additional devices on MCF532x.
In my I2C driver, the code is the following:
static
irqreturn_t coldfire_i2c_interrupt(int irq, void *dev_id)
{
/* check if we are called with the correct IRQ number */
if(irq != (MCFINT_VECBASE + MCFINT_I2C))
return IRQ_NONE;
/* check if I2C int flag is set and send the event to waiting queue */
if(*MCF_I2C_I2SR & MCF_I2C_I2SR_IIF) {
*MCF_I2C_I2SR &= ~MCF_I2C_I2SR_IIF;
atomic_set(&coldfire_i2c_irq_happened, 1);
wake_up_interruptible(&coldfire_i2c_queue);
}
return IRQ_HANDLED;
}
static int coldfire_wait_transfer(void) {
int timeout;
/* wait for data transfer to complete */
timeout = wait_event_interruptible_timeout(coldfire_i2c_queue,
1 ==
atomic_read(&coldfire_i2c_irq_happened),
COLDFIRE_I2C_TIMEOUT);
if ((timeout <= 0 ) || (*MCF_I2C_I2SR & MCF_I2C_I2SR_IAL)) {
printk("wt: timeout = %d, I2SR = %x\n, ih = %d",timeout,
*MCF_I2C_I2SR, atomic_read(&coldfire_i2c_irq_happened));
return -1;
}
else {
atomic_set(&coldfire_i2c_irq_happened, 0);
return 0;
}
};
>From time to time, the timeout happens and I get the message:
wt: timeout = 0, I2SR = a0, ih = 1
So obviously the interrupt happens and is correctly handled, but the
waitqueue is not awoken.
Did anybody else experience such a problem, or is it again something
peculiar to my setup?
Thank you and best regards,
Wolfgang
PS: of course I can post the complete I2C driver code, but I think
I messed up support for older processors while integrating the
interrupt stuff...
In case somebody is interested in it, feel free to grab it at
http://leila.dyna.ping.de/wolfgang/i2c-mcf.c
http://leila.dyna.ping.de/wolfgang/i2c-mcf.h
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