netdev - Re: [PATCH V3 1/3] can: flexcan: initialize all flexcan memory for ECC function

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Date:   Tue, 29 Sep 2020 13:30:37 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Joakim Zhang <qiangqing.zhang@....com>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V3 1/3] can: flexcan: initialize all flexcan memory for
 ECC function

On 9/29/20 1:27 PM, Joakim Zhang wrote:
> [...]
>>> +	reg_ctrl2 = priv->read(&regs->ctrl2);
>>> +	reg_ctrl2 |= FLEXCAN_CTRL2_WRMFRZ;
>>> +	priv->write(reg_ctrl2, &regs->ctrl2);
>>> +
>>> +	/* ranging from 0x0080 to 0x0ADF, ram details as below list:
>>> +	 * 0x0080--0x087F:	128 MBs
>>> +	 * 0x0880--0x0A7F:	128 RXIMRs
>>> +	 * 0x0A80--0x0A97:	6 RXFIRs
>>> +	 * 0x0A98--0x0A9F:	Reserved
>>> +	 * 0x0AA0--0x0AA3:	RXMGMASK
>>> +	 * 0x0AA4--0x0AA7:	RXFGMASK
>>> +	 * 0x0AA8--0x0AAB:	RX14MASK
>>> +	 * 0x0AAC--0x0AAF:	RX15MASK
>>> +	 * 0x0AB0--0x0ABF:	TX_SMB
>>> +	 * 0x0AC0--0x0ACF:	RX_SMB0
>>> +	 * 0x0AD0--0x0ADF:	RX_SMB1
>>
>> I don't like to have the register definition here *again), we have struct
>> flexcan_regs for this.
> 
> Do you mean still move these register definitions into flexcan_regs, right?

ack

>>> +	 */
>>> +	memset_io((void __iomem *)regs + 0x80, 0, 0xadf - 0x80 + 1);
>>
>> why the cast?
> 
> Yes, no need, will remove it.
> 
>> Can you use the "&regs->foo - &regs->bar + x" to get the length for the
>> memset?
> 
> After move above register definition into flexcan_regs, I can change to use
> this way to get the length for the memset_io.

ACK

>>> +
>>> +	/* ranging from 0x0F28 to 0x0FFF when CAN FD feature is enabled,
>>> +	 * ram details as below list:
>>> +	 * 0x0F28--0x0F6F:	TX_SMB_FD
>>> +	 * 0x0F70--0x0FB7:	RX_SMB0_FD
>>> +	 * 0x0FB8--0x0FFF:	RX_SMB0_FD
>>> +	 */
>>> +	memset_io((void __iomem *)regs + 0xf28, 0, 0xfff - 0xf28 + 1);
>>
>> same here
> 
> Will change.

tnx

> Hi Marc, I'm going on holiday from tomorrow, so I would delay to send out a
> V4 to review until I come back, sorry for this. Thanks for your comments of
> "can: flexcan: add CAN wakeup function for i.MX8", will rework the patch
> later.

Fine with me, I think we can push these changes via net to v5.10 after the v5.9
release is out.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |



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