netdev - Re: [PATCH V4 1/3] can: flexcan: initialize all flexcan memory for ECC function

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Date:   Tue, 29 Sep 2020 14:46:05 +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 V4 1/3] can: flexcan: initialize all flexcan memory for
 ECC function

On 9/29/20 2:38 PM, Joakim Zhang wrote:
>>>  		return flexcan_set_bittiming_ctrl(dev);  }
>>>
>>> +static void flexcan_init_ram(struct net_device *dev) {
>>> +	struct flexcan_priv *priv = netdev_priv(dev);
>>> +	struct flexcan_regs __iomem *regs = priv->regs;
>>> +	u32 reg_ctrl2;
>>> +
>>> +	/* 11.8.3.13 Detection and correction of memory errors:
>>> +	 * CTRL2[WRMFRZ] grants write access to all memory positions that
>>> +	 * require initialization, ranging from 0x080 to 0xADF and
>>> +	 * from 0xF28 to 0xFFF when the CAN FD feature is enabled.
>>> +	 * The RXMGMASK, RX14MASK, RX15MASK, and RXFGMASK registers
>> need to
>>> +	 * be initialized as well. MCR[RFEN] must not be set during memory
>>> +	 * initialization.
>>> +	 */
>>> +	reg_ctrl2 = priv->read(&regs->ctrl2);
>>> +	reg_ctrl2 |= FLEXCAN_CTRL2_WRMFRZ;
>>> +	priv->write(reg_ctrl2, &regs->ctrl2);
>>> +
>>> +	memset_io(&regs->mb[0][0], 0,
>>> +		  (u8 *)&regs->rx_smb1[3] - &regs->mb[0][0] + 0x4);
>>
>> why the cast?
> 
> Due to mb is defined as a u8. And the count of memset_io is bytes.

right. this is why you don't need the 2nd cast.

Marc


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