[Letux-kernel] Bug in i2c_device_probe

Tony Lindgren tony at atomide.com
Mon Jun 11 09:54:32 CEST 2018


* H. Nikolaus Schaller <hns at goldelico.com> [180611 07:20]:
> Hi Tony,
> 
> > Am 11.06.2018 um 09:07 schrieb Tony Lindgren <tony at atomide.com>:
> > 
> > * H. Nikolaus Schaller <hns at goldelico.com> [180610 08:33]:
> >> Hi Tony,
> >> I've observed this message on the Pyra with letux-4.17.0-lpae kernel:
> >> 
> >> [    1.806477] platform 48070000.i2c: Retrying from deferred list
> >> [    1.813802] ------------[ cut here ]------------
> >> [    1.818666] WARNING: CPU: 1 PID: 778 at drivers/irqchip/irq-gic.c:1016 gic_irq_domain_translate+0x78/0x100
> > 
> > Yes that needs to be fixed for all omap5 for the IRQ_TYPE_NONE
> > users. We just need to set the proper EDGE/LEVEL and the
> > direction for them in the omap5.dtsi file.
> > 
> >> The code has a comment:
> >> 
> >> 1015		/* Make it clear that broken DTs are... broken */
> >> 1016		WARN_ON(*type == IRQ_TYPE_NONE);
> >> 
> >> This would mean that something in the core DT is broken as we import the omap5-common.dtsi.
> >> 
> >> I have researched a little:
> > ...
> >> Should this be #interrupt-cells = <2>?
> > 
> > No we just need to stop using IRQ_TYPE_NONE :)
> 
> The omap5.dtsi seems to be clean, but
> 
> fgrep -R 'interrupts = <GIC' arch/arm/boot/dts/omap5*.dts*
> 
> reports (amongst good cases)
> 
> arch/arm/boot/dts/omap5-board-common.dtsi:		interrupts = <GIC_SPI 7 IRQ_TYPE_NONE>; /* IRQ_SYS_1N */
> arch/arm/boot/dts/omap5-board-common.dtsi:		interrupts = <GIC_SPI 119 IRQ_TYPE_NONE>; /* IRQ_SYS_2N cascaded to gic */
> arch/arm/boot/dts/omap5-cm-t54.dts:		interrupts = <GIC_SPI 7 IRQ_TYPE_NONE>; /* IRQ_SYS_1N */
> 
> I.e. Palmas and twl6040.
> 
> So what would be the right edges/levels? Also IRQ_TYPE_LEVEL_HIGH?

Yes I think that is correct. Might be worth checking the PMIC docs
and also see the comments in the following patch in Linux next:

21135b6ec700 ("Revert "ARM: dts: am437x-sk-evm: Correct tps65218 irq type"")

Regards,

Tony


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