netdev - Re: [PATCH V2 1/3] can: flexcan: initialize all flexcan memory for ECC function

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Date:   Mon, 28 Sep 2020 08:20:59 +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:     dl-linux-imx <linux-imx@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH V2 1/3] can: flexcan: initialize all flexcan memory for
 ECC function

On 9/28/20 7:23 AM, Joakim Zhang wrote:
>>>> +	for (i = 0; i < ram_init[0].len; i++)
>>>> +		priv->write(0, (void __iomem *)regs + ram_init[0].offset +
>>>> +sizeof(u32) * i);
>>>
>>> As the write function only does endian conversion, and you're writing 0 here.
>>> What about using iowrite32_rep() and get rid of the for loop?
>>
>> Thanks for this point, I will update in next version.
> 
> Ahhh.. I check iowrite32_rep() writes a buf to single address, no shift for address.

Doh! Right.

> I prefer to use memset_io() here to initialize a block of io memory. What do
> you think?

Of course, that's the correct function for this!

regards,
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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