netdev - Re: [PATCH v4 6/8] net: can: c_can: Disable pins when CAN interface is down

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Date:	Fri, 07 Nov 2014 15:54:40 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Roger Quadros <rogerq@...com>, 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 v4 6/8] net: can: c_can: Disable pins when CAN interface
 is down

On 11/07/2014 03:49 PM, 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);
> +	}

Please put this common code into a seperate function.

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
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