linux-kernel - Re: [PATCH 0/2] ACPI: Translate Linux IRQ number directly from GpioInt

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Message-ID: <20150429092609.GP1534@lahna.fi.intel.com>
Date:	Wed, 29 Apr 2015 12:26:09 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	sathyanarayanan kuppuswamy 
	<sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Octavian Purdila <octavian.purdila@...el.com>,
	Robert Dolca <robert.dolca@...el.com>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 0/2] ACPI: Translate Linux IRQ number directly from
 GpioInt

On Tue, Apr 28, 2015 at 10:36:48AM -0700, sathyanarayanan kuppuswamy wrote:
> >This requires that the boot firmware (BIOS/coreboot) configures these pins
> >correctly (input, etc) before handing over to OS. I've tested this on Intel
> >Baytrail, Braswell and Skylake based machines where this is true.
>
> Why not configure the GPIO pin as input in the API itself ?

IIRC Octavian tried to do just that but it turned out that some of the
irqchip functions are called with spinlock held, which means you can't
call all gpiod_* functions there (as they might sleep).
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