linux-kernel - Re: [PATCH v1 2/5] mtd: rawnand: meson: replace GENMASK() macro with define

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Date:   Wed, 12 Apr 2023 13:11:04 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     David Laight <David.Laight@...LAB.COM>,
        Liang Yang <liang.yang@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>
CC:     "oxffffaa@...il.com" <oxffffaa@...il.com>,
        "kernel@...rdevices.ru" <kernel@...rdevices.ru>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-amlogic@...ts.infradead.org" 
        <linux-amlogic@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/5] mtd: rawnand: meson: replace GENMASK() macro with
 define



On 12.04.2023 13:06, David Laight wrote:
> From: Arseniy Krasnov
>> Sent: 12 April 2023 07:17
>> Subject: [PATCH v1 2/5] mtd: rawnand: meson: replace GENMASK() macro with define
>>
> ...
>>  		len = mtd->writesize + mtd->oobsize;
>> -		cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir);
>> +		cmd = (len & NFC_CMD_RAW_LEN) | scrambler | DMA_DIR(dir);
>>  		writel(cmd, nfc->reg_base + NFC_REG_CMD);
> 
> What is the point of the mask?
> If the length is too big it just generates a different
> 'hard to debug' error.
> If the length can't be too bit there is no point masking it.

Exactly, thanks for pointing!

Thanks, Arseniy

> 
> 	David
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
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