linux-kernel - Re: [Regression] "irqdomain: Don't set type when mapping an IRQ" breaks nexus7 gpio buttons

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Date:	Wed, 10 Aug 2016 15:12:21 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Marc Zyngier <marc.zyngier@....com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [Regression] "irqdomain: Don't set type when mapping an IRQ"
 breaks nexus7 gpio buttons


On 10/08/16 14:58, Linus Walleij wrote:
> On Wed, Aug 10, 2016 at 11:56 AM, Jon Hunter <jonathanh@...dia.com> wrote:
>> Hi Marc, Linus,
>> On 10/08/16 10:41, Marc Zyngier wrote:
>>> On 10/08/16 00:03, Linus Walleij wrote:
>>>> On Tue, Aug 9, 2016 at 3:20 PM, Jon Hunter <jonathanh@...dia.com> wrote:
>>>>
>>>>> If that works, then does the following also work (without the above) ...
>>>>>
>>>>> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
>>>>> index b4c1bc7c9ca2..e111b72e3162 100644
>>>>> --- a/kernel/irq/chip.c
>>>>> +++ b/kernel/irq/chip.c
>>>>> @@ -824,6 +824,7 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
>>>>>                 irq_settings_set_norequest(desc);
>>>>>                 irq_settings_set_nothread(desc);
>>>>>                 desc->action = &chained_action;
>>>>> +               __irq_set_trigger(desc, irqd_get_trigger_type(&desc->irq_data));
>>>>>                 irq_startup(desc, true);
>>>>>         }
>>>>>  }
> (...)
>>>> I tried this on my problematic platform and then this happens:
>>>>
>>>> preparing networking...
>>>> [    2.628246] ------------[ cut here ]------------
>>>> [    2.628303] WARNING: CPU: 0 PID: 92 at ../kernel/irq/chip.c:26
>>>> bad_chained_irq+0x44/0x4c
> (...)
>> Just to confirm is that with or without the proposed change?
> 
> This is with:
> +               __irq_set_trigger(desc, irqd_get_trigger_type(&desc->irq_data));
> 
> No other changes.
> 
> Before the change it boots, but the IRQs don't work.
> 
> After the change it boots and crashes like that.

OK.

>> Linus, I have been trying to find out which qcom board has this smsc911x
>> but I was unable to find any, so more info on the platform would be great!
> 
> It has nothing to do with the SMSC911x per se. The problem pertains
> to *all* IRQs from the PMIC.
> 
> This is the original APQ8060 Dragonboard from BSquare.
> https://dflund.se/~triad/krad/dragonboard/

Where can I see the DT source for this board? There is a
arch/arm/boot/dts/qcom-apq8060-dragonboard.dts but this does not appear
to be the same (does not have smsc911x).

Cheers
Jon

-- 
nvpublic