linux-kernel - Re: omap5 fixing palmas IRQ_TYPE_NONE warning leads to gpadc timeouts

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Date:   Tue, 20 Nov 2018 09:36:19 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     Belisko Marek <marek.belisko@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        "Dr. H. Nikolaus Schaller" <hns@...delico.com>,
        Laxman Dewangan <ldewangan@...dia.com>
Subject: Re: omap5 fixing palmas IRQ_TYPE_NONE warning leads to gpadc timeouts



On 19/11/2018 18.19, Tony Lindgren wrote:
> * Peter Ujfalusi <peter.ujfalusi@...com> [181119 10:16]:
>> On 2018-11-13 20:06, Tony Lindgren wrote:
>>> Looks like the IRQ_TYPE_NONE issue still is there for omap5 and
>>> should be fixed with IRQ_TYPE_HIGH.
>>>
>>> No idea about why palmas interrupts would stop working though,
>>> Peter, do you have any ideas on this one?
>>
>> No, I don't.
>> The INT polarity can be changed in Palmas.
>> based on the pdata->irq_flags (queried via irqd_get_trigger_type())
>> the code  configures it:
>>
>> if (pdata->irq_flags & IRQ_TYPE_LEVEL_HIGH)
>> 	reg = PALMAS_POLARITY_CTRL_INT_POLARITY;
>> else
>> 	reg = 0;
>>
>> and we pass the same irq_flags to the regmap_add_irq_chip()
>> IRQ_TYPE_LEVEL_HIGH == IRQF_TRIGGER_HIGH == 0x00000004
>>
>> A change in DT should be enough, no need to patch palmas.c, imho.
> 
> But it's not. I'm now wondering if wakeupgen is inverting the
> polarity for this interrupt?
> 
> GIC docs say this about SPI interrupts:
> 
> "SPI is triggered on a rising edge or is active-HIGH level-sensitive."
> 
> So when setting IRQ_TYPE_LEVEL_HIGH in dts, we still must not
> invert the polarity in palmas while tegra needs to. So either
> tegra114 hardware is inverting the polarity, or omap5 wakeupgen
> is.
> 
> Does the palmas trm say which way PALMAS_POLARITY_CTRL
> triggers if PALMAS_POLARITY_CTRL_INT_POLARITY is set?

bit7 INT_POLARITY Select the polarity of the INT output line
0: Interrupt line (INT) is low when interrupt is pending (default) RW
1: Interrupt line (INT) is high when interrupt is pending

> Also note that dra7 is using a gpio for palmas interrupt.
> 
> Regards,
> 
> Tony
> 

- Péter

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