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

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Date:	Mon, 8 Feb 2016 21:04:30 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-renesas-soc@...r.kernel.org,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Salvator-X ravb failure with v4.5-rc3 due to irqchip power down


> 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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