Re: Salvator-X ravb failure with v4.5-rc3 due to irqchip power down

[Wolfram Sang]

> The real problem is that the PHY interrupt is wired to an on-chip GPIO
> controller, which is disabled by PM Runtime if no GPIOs are in use, and
> interrupts are not taken into account (the irqchip subsystem is not (yet) PM
> Runtime aware) for GPIO use.
>
> Adding a call to
>
>     pm_runtime_get_sync(dev);
>
> to gpio_rcar_probe() fixes the problem, but keeps the GPIO modules enabled
> all the time.
>
> IIRC, we have a similar issue with HDMI on r8a7791/koelsch...

Exactly, the interrupt for 'EDID read done' never arrived because of
this.

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