linux-kernel - Re: [PATCH v2 1/7] extcon: usb-gpio: Introduce gpio usb extcon driver

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Date:	Wed, 28 Jan 2015 09:09:55 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Roger Quadros <rogerq@...com>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>, Felipe Balbi <balbi@...com>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	george.cherian@...com, nsekhar@...com,
	devicetree <devicetree@...r.kernel.org>,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/7] extcon: usb-gpio: Introduce gpio usb extcon driver

* Roger Quadros <rogerq@...com> [150128 04:15]:
> On 28/01/15 04:19, Chanwoo Choi wrote:
> >>
> >> I still fail to understand that we need to call disable_irq() in .suspend() and
> >> enable_irq() in .resume()
> >>
> >> can you point me to any other drivers doing so?
> > 
> > You can refer the suspend function in drivers/mfd/max14577.c or drivers/mfd/max77693.c.
> > The max14577_suspend() includes the detailed comment for why using disable_irq() in suspend function.
> > 
> > In max14577 case, max14577_suspend() use disable_irq() function because of i2c dependency.
> > If max14577 device is wake-up from suspend state before completing the resume sequence
> > of i2c, max14577 may fail to read/write i2c communication.
> 
> Thanks for this information. I will add disable/enable_irq() in suspend/resume().

Are the .dts changes safe for me to apply already?

Regards,

Tony
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