On 14/08/15 11:18, Grygorii Strashko wrote:
> On 08/13/2015 03:58 PM, Grygorii Strashko wrote:
>> On 08/13/2015 01:31 PM, Grygorii Strashko wrote:
>>> On 08/13/2015 01:01 PM, Marc Zyngier wrote:
>>>> On 12/08/15 18:45, Grygorii Strashko wrote:
>>>>> The irqchip_set_wake_parent should not fail if IRQ chip
>>>>> specifies IRQCHIP_SKIP_SET_WAKE. Otherwise, IRQ wakeup
>>>>> configuration can't be propagated properly through IRQ
>>>>> domains hierarchy.
>>>>>
>>>>> In case of TI OMAP DRA7 the issue reproduced with following
>>>>> configuration:
>>>>> ARM GIC<-OMAP wakeupgen<-TI CBAR<-GPIO<-GPIO pcf857x<-gpio_key
>>>>>
>>>>> gpio_key is wakeup source
>>>>>
>>>>> Failure is reproduced during suspend/resume to RAM:
>>>>> suspend:
>>>>> - gpio_keys_suspend
>>>>> enable_irq_wake
>>>>> + pcf857x_irq_set_wake
>>>>> + omap_gpio_wake_enable
>>>>> + TI CBAR irq_chip_set_wake_parent
>>>>> + OMAP wakeupgen has no .irq_set_wake()
>>>>
>>>> Most importantly, wakeupgen has IRQCHIP_SKIP_SET_WAKE set.
>>>>
>>>>> and -ENOSYS will be returned
>>>>>
>>>>> resume:
>>>>> - gpio_keys_resume
>>>>> + disable_irq_wake
>>>>> + irq_set_irq_wake
>>>>> + WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
>>>>>
>>>>> Fixes: 08b55e2a9208 ('genirq: Add irqchip_set_wake_parent')
>>>>> Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
>>>>> ---
>>>>> kernel/irq/chip.c | 4 ++++
>>>>> 1 file changed, 4 insertions(+)
>>>>>
>>>>> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
>>>>> index 6de638b..bdb1b9d 100644
>>>>> --- a/kernel/irq/chip.c
>>>>> +++ b/kernel/irq/chip.c
>>>>> @@ -1024,6 +1024,10 @@ int irq_chip_set_vcpu_affinity_parent(struct
>>>>> irq_data *data, void *vcpu_info)
>>>>> int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
>>>>> {
>>>>> data = data->parent_data;
>>>>> +
>>>>> + if (irq_data_get_irq_chip(data)->flags & IRQCHIP_SKIP_SET_WAKE)
>>>>> + return 0;
>>>>> +
>>>>> if (data->chip->irq_set_wake)
>>>>> return data->chip->irq_set_wake(data, on);
>>>>>
>>>>>
>>>>
>>>> We have a more general issue with chip flags, and how they combine
>>>> within a stack of irqchips.
>>>
>>> Indeed. Problem looks similar to IRQCHIP_MASK_ON_SUSPEND flag usage.
>>>
>>>>
>>>> What if you remove the irq_chip_set_wake_parent from the crossbar
>>>> driver, and instead set IRQCHIP_SKIP_SET_WAKE?
>>>
>>> I've thought about this and it should work for me.
>>> One question - what if crossbar will be not the last one in
>>> IRQ domains hierarchy?
>>>
>>
>> I can confirm, if I revert this patch, add IRQCHIP_SKIP_SET_WAKE to
>> the crossbar and remove irq_chip_set_wake_parent wakeups still works.
>> What do you prefer me to do: add additional patch for the crossbar,
>> drop/keep this patch?
>>
>
> OK. There are two possibilities to fix set_wake functionality for TI OMAPs
> where below HW configurations are used:
> OMAP4/5: GIC <- OMAP wakeupgen
> DRA7: GIC <- OMAP wakeupgen <- TI CBAR
>
>
> 1) ensure that IRQCHIP_SKIP_SET_WAKE flag is set only for GIC and
> use irq_chip_set_wake_parent() in both wakeupgen and crossbar
> [this patch is required]
>
> 2) ensure that IRQCHIP_SKIP_SET_WAKE flag is set and drop
> .irq_set_wake()/irq_chip_set_wake_parent() for all IRQ chips
> in IRQ domains hierarchy.
> [this patch can be dropped]
>
> I'm going to select approach 2 and re-send.
Yeah, I'd like to go for the minimal approach for now, and work out what
exactly are the propagation semantics (I had something at some point,
need to find what I did with those patches...).
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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