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

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Date:   Wed, 14 Nov 2018 09:03:53 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Belisko Marek <marek.belisko@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-omap@...r.kernel.org,
        "Dr. H. Nikolaus Schaller" <hns@...delico.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Subject: Re: omap5 fixing palmas IRQ_TYPE_NONE warning leads to gpadc timeouts

* Tony Lindgren <tony@...mide.com> [181113 18:07]:
> Hi
> 
> * Belisko Marek <marek.belisko@...il.com> [180703 18:34]:
> > Hi Tony,
> > 
> > On Tue, Jul 3, 2018 at 10:45 AM Tony Lindgren <tony@...mide.com> wrote:
> > >
> > > * Belisko Marek <marek.belisko@...il.com> [180620 09:40]:
> > > > Hello,
> > > >
> > > > I'm trying to fix warning (for omap5 board) produced by recent change
> > > > to avoid using IRQ_TYPE_NONE like:
> > > > [    1.818666] WARNING: CPU: 1 PID: 778 at
> > > > drivers/irqchip/irq-gic.c:1016 gic_irq_domain_translate+0x78/0x100
> > > > [    1.828839] Modules linked in:
> > > >
> > > > I did look to other commit which did update and without deep knowledge
> > > > I just simply do this small change:
> > > > diff --git a/arch/arm/boot/dts/omap5-board-common.dtsi
> > > > b/arch/arm/boot/dts/omap5-board-common.dtsi
> > > > index 218892b..ab2df8c 100644
> > > > --- a/arch/arm/boot/dts/omap5-board-common.dtsi
> > > > +++ b/arch/arm/boot/dts/omap5-board-common.dtsi
> > > > @@ -393,7 +393,7 @@
> > > >
> > > >         palmas: palmas@48 {
> > > >                 compatible = "ti,palmas";
> > > > -               interrupts = <GIC_SPI 7 IRQ_TYPE_NONE>; /* IRQ_SYS_1N */
> > > > +               interrupts = <GIC_SPI 7 IRQ_TYPE_HIGH>; /* IRQ_SYS_1N */
> > > >                 reg = <0x48>;
> > > >                 interrupt-controller;
> > > >                 #interrupt-cells = <2>;
> > > >
> > > > and it looks board boots fine. Only issue is that gpadc driver is not
> > > > working (at least not getting interrupts at all ADC fails with
> > > > timeout). I did look to gpadc driver and driver is not using
> > > > interrupts defined in dts but request interrupt directly from palmas
> > > > mfd module. Any ideas what needs to be changed to have gpadc again
> > > > working with mentioned patch?
> > >
> > > Can you try with IRQF_TRIGGER_HIGH added also to the flags to
> > > regmap_add_irq_chip() in drivers/mfd/palmas.c?
> > Nope issue is till present also after this change like:
> > diff --git a/arch/arm/boot/dts/omap5-board-common.dtsi
> > b/arch/arm/boot/dts/omap5-board-common.dtsi
> > index 218892b..6912769 100644
> > --- a/arch/arm/boot/dts/omap5-board-common.dtsi
> > +++ b/arch/arm/boot/dts/omap5-board-common.dtsi
> > @@ -393,7 +393,7 @@
> > 
> >         palmas: palmas@48 {
> >                 compatible = "ti,palmas";
> > -               interrupts = <GIC_SPI 7 IRQ_TYPE_NONE>; /* IRQ_SYS_1N */
> > +               interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>; /* IRQ_SYS_1N */
> >                 reg = <0x48>;
> >                 interrupt-controller;
> >                 #interrupt-cells = <2>;
> > @@ -432,9 +432,9 @@
> > 
> >                 gpadc: gpadc {
> >                         compatible = "ti,palmas-gpadc";
> > -                       interrupts = <18 0
> > -                                     16 0
> > -                                     17 0>;
> > +                       interrupts = <18 IRQ_TYPE_LEVEL_HIGH
> > +                                     16 IRQ_TYPE_LEVEL_HIGH
> > +                                     17 IRQ_TYPE_LEVEL_HIGH>;
> >                         #io-channel-cells = <1>;
> >                         ti,channel0-current-microamp = <5>;
> >                         ti,channel3-current-microamp = <10>;
> > diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
> > index 663a239..15d23db 100644
> > --- a/drivers/mfd/palmas.c
> > +++ b/drivers/mfd/palmas.c
> > @@ -601,7 +601,7 @@ static int palmas_i2c_probe(struct i2c_client *i2c,
> >         regmap_write(palmas->regmap[slave], addr, reg);
> > 
> >         ret = regmap_add_irq_chip(palmas->regmap[slave], palmas->irq,
> > -                                 IRQF_ONESHOT | pdata->irq_flags, 0,
> > +                                 IRQF_ONESHOT | IRQF_TRIGGER_HIGH |
> > pdata->irq_flags, 0,
> >                                   driver_data->irq_chip, &palmas->irq_data);
> >         if (ret < 0)
> >                 goto err_i2c;
> 
> Looks like the IRQ_TYPE_NONE issue still is there for omap5 and
> should be fixed with IRQ_TYPE_HIGH.

Looks like the gpadc interrupts get fixed for IRQ_TYPE_LEVEL_HIGH
if reconfiguring of PALMAS_POLARITY_CTRL_INT_POLARITY is disabled
in drivers/mfd/palmas.c.

The test being just:

modprobe palmas-gpadc
cat /sys/bus/iio/devices/iio:device0/*

> No idea about why palmas interrupts would stop working though,
> Peter, do you have any ideas on this one?

Still no idea why though, it seems tegra is inverting
the interrupt externally because of earlier patches for adding
"ti,irq-externally-inverted" property that never got added.

So I'm guessing the PALMAS_POLARITY_CTRL_INT_POLARITY
is wrongly configured on IRQ_TYPE_LEVEL_HIGH while it should
be done only for IRQ_TYPE_LEVEL_LOW instead?

So adding Laxman to Cc also.

Regards,

Tony