linux-kernel - Re: [PATCH] extcon: palmas: Dont set USB state if ID pin is grounded

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Date:	Tue, 10 Sep 2013 17:27:58 +0530
From:	George Cherian <george.cherian@...com>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	"cw00.choi@...sung.com" <cw00.choi@...sung.com>,
	"kishon@...com" <kishon@...com>
Subject: Re: [PATCH] extcon: palmas: Dont set USB state if ID pin is grounded

On 9/10/2013 2:47 PM, Laxman Dewangan wrote:
> On Tuesday 10 September 2013 01:19 PM, George Cherian wrote:
>> In OMAP5 when USB-HOST is set true, the VBUS regulator  is turned ON.
>> This causes a VBUS interrupt, ignore the same if we are already in
>> USB-HOST.
>>
>> Signed-off-by: George Cherian <george.cherian@...com>
>> ---
>>   drivers/extcon/extcon-palmas.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/extcon/extcon-palmas.c 
>> b/drivers/extcon/extcon-palmas.c
>> index 9672f31..91b31af 100644
>> --- a/drivers/extcon/extcon-palmas.c
>> +++ b/drivers/extcon/extcon-palmas.c
>> @@ -50,6 +50,9 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, 
>> void *_palmas_usb)
>>       struct palmas_usb *palmas_usb = _palmas_usb;
>>       unsigned int vbus_line_state;
>>   +    if (palmas_usb->linkstat == PALMAS_USB_STATE_ID)
>> +        return IRQ_HANDLED;
>> +
>
> Should we really handle this on this extcon driver? I think it should 
> be handled in the USB driver. If port is OTG type and if usb driver 
> enable the VBUS then it can expect the VBUS available notification but 
> based on the USB driver state, it should ignore this notification.
>
Correct extcon should just notify and the consumer should take 
appropriate decision.
> Otherwise, Palmas pin find that there is VBUS state true but the SW 
> status will show as the VBUS not there.
>


-- 
-George

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