linux-kernel - RE: [PATCH 1/2] can: m_can: Increase delay to ensure written INIT accepted

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Message-ID: <B256D81BAE5131468A838E5D7A243641D636B722@penmbx01>
Date:	Thu, 19 Nov 2015 04:25:17 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>,
	Wolfgang Grandegger <wg@...ndegger.com>
CC:	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>
Subject: RE: [PATCH 1/2] can: m_can: Increase delay to ensure written INIT
 accepted

Hi Marc,

Thank you for prompt feedback.

> -----Original Message-----
> From: Marc Kleine-Budde [mailto:mkl@...gutronix.de]
> Sent: 2015年11月18日 18:26
> To: Yang, Wenyou; Wolfgang Grandegger
> Cc: linux-can@...r.kernel.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Ferre, Nicolas
> Subject: Re: [PATCH 1/2] can: m_can: Increase delay to ensure written INIT
> accepted
> 
> On 11/18/2015 11:04 AM, Wenyou Yang wrote:
> > Increase the delay time until the value written to INIT can be read
> > back to ensure that the previous value written to INIT has been
> > accepted.

I tested it again with different clock frequencies, it works without this patch. Maybe I made a mistake.

Sorry about it. 

Please ignore.

> >
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> 
> The patch looks ok, can you please add to your commit message which SoCs are
> affected by this problem.
> 
> > ---
> >
> >  drivers/net/can/m_can/m_can.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/can/m_can/m_can.c
> > b/drivers/net/can/m_can/m_can.c index ef65517..fd1caa0 100644
> > --- a/drivers/net/can/m_can/m_can.c
> > +++ b/drivers/net/can/m_can/m_can.c
> > @@ -320,7 +320,7 @@ static inline void m_can_config_endisable(const struct
> m_can_priv *priv,
> >  					  bool enable)
> >  {
> >  	u32 cccr = m_can_read(priv, M_CAN_CCCR);
> > -	u32 timeout = 10;
> > +	u32 timeout = 1000;
> >  	u32 val = 0;
> >
> >  	if (enable) {
> >
> 
> Marc
> 
> --
> Pengutronix e.K.                  | Marc Kleine-Budde           |
> Industrial Linux Solutions        | Phone: +49-231-2826-924     |
> Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
> Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


Best Regards,
Wenyou Yang