netdev - Re: M_CAN message RAM initialization AppNote - was: Re: [PATCH V3 3/3] can: m_can: workaround for transmit data less than 4 bytes

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Message-ID: <20141107084051.GB23086@shlinux1.ap.freescale.net>
Date:	Fri, 7 Nov 2014 16:40:52 +0800
From:	Dong Aisheng <b29396@...escale.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	Oliver Hartkopp <socketcan@...tkopp.net>,
	<linux-can@...r.kernel.org>, <wg@...ndegger.com>,
	<varkabhadram@...il.com>, <netdev@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: M_CAN message RAM initialization AppNote  - was: Re: [PATCH V3
 3/3] can: m_can: workaround for transmit data less than 4 bytes

On Thu, Nov 06, 2014 at 01:47:20PM +0100, Marc Kleine-Budde wrote:
> On 11/06/2014 01:33 PM, Oliver Hartkopp wrote:
> >> So i'm not sure memset() the entire TX FIFO element is neccesary...
> > 
> > It's no big deal - so we should be defensive here.
> > And memset() is not working as Marc pointed out in another mail.
> > 
> > So we would need to loop with
> > 
> >     m_can_fifo_write(priv, 0, M_CAN_FIFO_DATA(i), 0x0);
> > 
> >>
> >> Do you think we could keep the current solution firstly and updated later
> >> if needed?
> > 
> > No :-)
> > 
> > I would like to have all data bytes to be written at startup.
> 
> Me, too. As this happens only once during ifconfig up it should not hurt
> performance, either send an incremental or new patch. I'll sort it out.
> 

I will send a new patch for this.

Regards
Dong Aisheng

> 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   |
> 


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