Failed to setup hwmod io irq -22

Sophia Kalibo

Hi,

I have checked the booting log in am335x and got the following message

mux: Failed to setup hwmod io irq -22

This message comes from mux.c , it seems like failed in request_irq function

ret = request_irq(omap_prcm_event_to_irq("io"),
        omap_hwmod_mux_handle_irq, IRQF_SHARED | IRQF_NO_SUSPEND,
            "hwmod_io", omap_mux_late_init);

    if (ret)
        pr_warning("mux: Failed to setup hwmod io irq %d\n", ret);

This is just a warning message. Should I be concerned? Is there anything wrong?

Thank you.

over 12 years ago

0 Miroslav Kiradzhiyski XID over 12 years ago

TI__Mastermind 25235 points

Hi,

It's just a warning.

ERRNO -22 means:

#define	EINVAL		22	/* Invalid argument */

An irq for the "io" event is tried to be requested, but the omap_prcm_event_to_irq() function detects that the prcm_irq_setup structure isn't initialized. More info on this structure can be found in prm_common.c:

/*
 * prcm_irq_setup: the PRCM IRQ parameters for the hardware the code
 * is currently running on.  Defined and passed by initialization code
 * that calls omap_prcm_register_chain_handler().
 */
static struct omap_prcm_irq_setup *prcm_irq_setup;

Check the static int __init omap3xxx_prcm_init(void) function inside prm2xxx_3xxx.c and you will find that the omap_prcm_register_chain_handler() function is only called if the CPU is omap34xx and not am33xx, as it is in our case, so the prcm_irq_setup structure is never initialized.

I hope this explains why the warning message is printed.

Best regards,
Miroslav

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Failed to setup hwmod io irq -22