On Tue, Nov 10, 2015 at 11:58:12AM +0200, Grygorii Strashko wrote:
> Commit e509bd7da149 ("genirq: Allow migration of chained interrupts
> by installing default action") breaks PCS wake up IRQ behaviour on
> TI OMAP based platforms (dra7-evm).
>
> TI OMAP IRQ wake up configuration:
> GIC-irqchip->PCM_IRQ
> |- omap_prcm_register_chain_handler
> |- PRCM-irqchip -> PRCM_IO_IRQ
> |- pcs_irq_chain_handler
> |- pinctrl-irqchip -> PCS_uart1_wakeup_irq
>
> This happens because IRQ PM code (irq/pm.c) is expected to ignore
> chained interrupts by default:
> static bool suspend_device_irq(struct irq_desc *desc)
> {
> if (!desc->action || desc->no_suspend_depth)
> return false;
> - it's expected !desc->action = true for chained interrupts;
Indeed it is. I missed that, sorry.
> but, after above change, all chained interrupt descriptors will
> have default action handler installed - chained_action.
> As result, chained interrupts will be silently disabled during system
> suspend.
>
> Hence, fix it by introducing helper function irq_desc_is_chained() and
> use it in suspend_device_irq() for chained interrupts identification
> and skip them, once detected.
>
> Cc: Mika Westerberg <mika.westerb...@linux.intel.com>
FWIW,
Reviewed-by: Mika Westerberg <mika.westerb...@linux.intel.com>
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