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

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Date:	Fri, 30 Jan 2015 12:58:39 +0200
From:	Roger Quadros <rogerq@...com>
To:	Tony Lindgren <tony@...mide.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

On 29/01/15 18:56, Tony Lindgren wrote:
> * Roger Quadros <rogerq@...com> [150129 03:34]:
>> On 28/01/15 19:09, Tony Lindgren wrote:
>>> * 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?
>>>
>>
>> Yes Tony, you can pick them. Thanks.
> 
> OK will apply the dts changes into omap-for-v3.20/dt thanks.
> I have also the defconfig changes tagged, will apply those
> a bit later probably as a fix after the driver is merged.

Sounds good to me. Thanks Tony.

cheers,
-roger
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