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Date:   Mon, 6 Mar 2017 02:27:45 +0000
From:   <Wenyou.Yang@...rochip.com>
To:     <socketcan@...tkopp.net>, <wg@...ndegger.com>, <mkl@...gutronix.de>
CC:     <alexandre.belloni@...e-electrons.com>, <f.fainelli@...il.com>,
        <quentin.schulz@...e-electrons.com>, <nicolas.ferre@...el.com>,
        <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] can: m_can: support transmit frame in CAN FD format

Hi Oliver,

Thank you for your review.

> -----Original Message-----
> From: Oliver Hartkopp [mailto:socketcan@...tkopp.net]
> Sent: 2017年3月6日 3:34
> To: Wenyou Yang - A41535 <Wenyou.Yang@...rochip.com>; Wolfgang
> Grandegger <wg@...ndegger.com>; Marc Kleine-Budde <mkl@...gutronix.de>
> Cc: Alexandre Belloni <alexandre.belloni@...e-electrons.com>; Florian Fainelli
> <f.fainelli@...il.com>; Quentin Schulz <quentin.schulz@...e-electrons.com>;
> Wenyou Yang - A41535 <Wenyou.Yang@...rochip.com>; Nicolas Ferre
> <nicolas.ferre@...el.com>; linux-can@...r.kernel.org; netdev@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] can: m_can: support transmit frame in CAN FD format
> 
> The patch has some issues:
> 
> On 03/03/2017 06:33 AM, Wenyou Yang wrote:
> > Add support to transmit the frame in the CAN FD format and with the
> > bit rate switching.
> 
> This is a misleading comment.
> 
> "can: m_can: support transmit frame in CAN FD format"
> is misleading too. You were able to send CAN FD frames before.
> 
> This patch enables the transmission of CAN FD frames on M_CAN IP cores  >=
> v3.1.x, right?

The revision of M_CAN IP on SAMA5D2 is 3.1.0 (CREL = 0x31040730).

> 
> So this should be mentioned properly.
> 
> > Tested on SAMA5D2 Xplained board.
> 
> Tested on which M_CAN IP core revision would be useful here.
> 
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > ---
> > The testing is based on
> > [RESEND PATCH 1/1] can: m_can: fix bitrate setup on latest silicon
> > http://lkml.iu.edu/hypermail/linux/kernel/1702.1/05347.html
> >
> >  drivers/net/can/m_can/m_can.c | 21 +++++++++++++++++----
> >  1 file changed, 17 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/can/m_can/m_can.c
> > b/drivers/net/can/m_can/m_can.c index 195f15edb32e..9ef9b337d25b
> > 100644
> > --- a/drivers/net/can/m_can/m_can.c
> > +++ b/drivers/net/can/m_can/m_can.c
> > @@ -266,8 +266,12 @@ enum m_can_mram_cfg {
> >
> >  /* Tx Buffer Element */
> >  /* R0 */
> > +#define TX_BUF_ESI		BIT(31)
> >  #define TX_BUF_XTD		BIT(30)
> >  #define TX_BUF_RTR		BIT(29)
> > +#define TX_BUF_EFC		BIT(23)
> > +#define TX_BUF_EDL		BIT(21)
> 
> This bit is named FDF (FD Format bit).
> 
> It has to be:
> 
> #define TX_BUF_FDF		BIT(21)
> 
> > +#define TX_BUF_BRS		BIT(20)
> >
> >  /* address offset and element number for each FIFO/Buffer in the
> > Message RAM */  struct mram_cfg { @@ -884,7 +888,7 @@ static void
> > m_can_chip_config(struct net_device *dev)
> >  	}
> >
> >  	if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
> > -		cccr |= CCCR_CME_CANFD_BRS << CCCR_CME_SHIFT;
> > +		cccr |= (CCCR_CME_CANFD_BRS | CCCR_CME_CANFD) <<
> CCCR_CME_SHIFT;
> >
> >  	m_can_write(priv, M_CAN_CCCR, cccr);
> >  	m_can_write(priv, M_CAN_TEST, test); @@ -1047,6 +1051,7 @@ static
> > netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> >  	struct canfd_frame *cf = (struct canfd_frame *)skb->data;
> >  	u32 id, cccr;
> >  	int i;
> > +	u32 dlc;
> >
> >  	if (can_dropped_invalid_skb(dev, skb))
> >  		return NETDEV_TX_OK;
> > @@ -1065,7 +1070,6 @@ static netdev_tx_t m_can_start_xmit(struct
> > sk_buff *skb,
> >
> >  	/* message ram configuration */
> >  	m_can_fifo_write(priv, 0, M_CAN_FIFO_ID, id);
> > -	m_can_fifo_write(priv, 0, M_CAN_FIFO_DLC, can_len2dlc(cf->len) << 16);
> >
> >  	for (i = 0; i < cf->len; i += 4)
> >  		m_can_fifo_write(priv, 0, M_CAN_FIFO_DATA(i / 4), @@ -
> 1073,20
> > +1077,29 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> >
> >  	can_put_echo_skb(skb, dev, 0);
> >
> > +	dlc = can_len2dlc(cf->len) << 16;
> > +
> >  	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
> >  		cccr = m_can_read(priv, M_CAN_CCCR);
> >  		cccr &= ~(CCCR_CMR_MASK << CCCR_CMR_SHIFT);
> >  		if (can_is_canfd_skb(skb)) {
> > -			if (cf->flags & CANFD_BRS)
> > +			dlc |= TX_BUF_EDL;
> 
> dito FDF
> 
> > +			if (cf->flags & CANFD_ESI)
> > +				dlc |= TX_BUF_ESI;
> > +			if (cf->flags & CANFD_BRS) {
> > +				dlc |= TX_BUF_BRS;
> >  				cccr |= CCCR_CMR_CANFD_BRS <<
> CCCR_CMR_SHIFT;
> > -			else
> > +			} else {
> >  				cccr |= CCCR_CMR_CANFD <<
> CCCR_CMR_SHIFT;
> > +			}
> >  		} else {
> >  			cccr |= CCCR_CMR_CAN << CCCR_CMR_SHIFT;
> >  		}
> >  		m_can_write(priv, M_CAN_CCCR, cccr);
> >  	}
> >
> > +	m_can_fifo_write(priv, 0, M_CAN_FIFO_DLC, dlc);
> > +
> >  	/* enable first TX buffer to start transfer  */
> >  	m_can_write(priv, M_CAN_TXBTIE, 0x1);
> >  	m_can_write(priv, M_CAN_TXBAR, 0x1);
> >
> 
> Beside the documentation and the wrong bit naming the patch looks ok.
> Please resend.

I will send a version 2. Thanks

> 
> Regards,
> Oliver


Best Regards,
Wenyou Yang

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