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

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Message-ID: <554118C8.4020204@linux.intel.com>
Date:	Wed, 29 Apr 2015 10:45:44 -0700
From:	sathyanarayanan kuppuswamy 
	<sathyanarayanan.kuppuswamy@...ux.intel.com>
To:	Mika Westerberg <mika.westerberg@...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 04/29/2015 02:26 AM, Mika Westerberg wrote:
> 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).
Got it. Thanks.
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-- 
Sathyanarayanan Kuppuswamy
Android kernel developer

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