netdev - Re: [PATCH v3 6/8] net: can: c_can: Disable pins when CAN interface is down

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Message-ID: <545A270C.7070102@ti.com>
Date:	Wed, 5 Nov 2014 15:33:00 +0200
From:	Roger Quadros <rogerq@...com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>, <wg@...ndegger.com>
CC:	<wsa@...-dreams.de>, <tony@...mide.com>, <tglx@...utronix.de>,
	<mugunthanvnm@...com>, <george.cherian@...com>, <balbi@...com>,
	<nsekhar@...com>, <nm@...com>,
	<sergei.shtylyov@...entembedded.com>, <linux-omap@...r.kernel.org>,
	<linux-can@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 6/8] net: can: c_can: Disable pins when CAN interface
 is down

On 11/05/2014 03:24 PM, Marc Kleine-Budde wrote:
> On 11/04/2014 11:20 AM, Roger Quadros wrote:
>> DRA7 CAN IP suffers from a problem which causes it to be prevented
>> from fully turning OFF (i.e. stuck in transition) if the module was
>> disabled while there was traffic on the CAN_RX line.
>>
>> To work around this issue we select the SLEEP pin state by default
>> on probe and use the DEFAULT pin state on CAN up and back to the
>> SLEEP pin state on CAN down.
>>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>>  drivers/net/can/c_can/c_can.c          | 20 ++++++++++++++++++++
>>  drivers/net/can/c_can/c_can.h          |  1 +
>>  drivers/net/can/c_can/c_can_platform.c | 20 ++++++++++++++++++++
>>  3 files changed, 41 insertions(+)
>>
>> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
>> index 8e78bb4..4dfc3ce 100644
>> --- a/drivers/net/can/c_can/c_can.c
>> +++ b/drivers/net/can/c_can/c_can.c
>> @@ -35,6 +35,7 @@
>>  #include <linux/list.h>
>>  #include <linux/io.h>
>>  #include <linux/pm_runtime.h>
>> +#include <linux/pinctrl/consumer.h>
>>  
>>  #include <linux/can.h>
>>  #include <linux/can/dev.h>
>> @@ -603,6 +604,15 @@ static int c_can_start(struct net_device *dev)
>>  
>>  	priv->can.state = CAN_STATE_ERROR_ACTIVE;
>>  
>> +	/* activate pins */
>> +	if (!IS_ERR(priv->pinctrl)) {
>> +		struct pinctrl_state *s;
>> +
>> +		s = pinctrl_lookup_state(priv->pinctrl, PINCTRL_STATE_DEFAULT);
>> +		if (!IS_ERR(s))
>> +			pinctrl_select_state(priv->pinctrl, s);
>> +	}
> 
> Can you factor this into a common function? Which is used like this:
> 
> c_can_pinctrl_select_state(priv, PINCTRL_STATE_DEFAULT)
> 
> Otherwise looks god.

OK.

cheers,
-roger
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