linux-kernel - Re: [PATCH v2 4/5] mtd: spinand: micron: OTP access for MT29F2G01ABAGD

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Message-ID: <20241025095124.0403bdd6@xps-13>
Date: Fri, 25 Oct 2024 09:51:24 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Martin Kurbanov <mmkurbanov@...utedevices.com>
Cc: Richard Weinberger <richard@....at>, Vignesh Raghavendra
 <vigneshr@...com>, Mika Westerberg <mika.westerberg@...ux.intel.com>,
 "Michael Walle" <michael@...le.cc>, Mark Brown <broonie@...nel.org>,
 Chia-Lin Kao <acelan.kao@...onical.com>, Md Sadre Alam
 <quic_mdalam@...cinc.com>, "Ezra Buehler"
 <ezra.buehler@...qvarnagroup.com>, Sridharan S N <quic_sridsn@...cinc.com>,
 Frieder Schrempf <frieder.schrempf@...tron.de>, Alexey Romanov
 <avromanov@...utedevices.com>, <linux-kernel@...r.kernel.org>,
 <linux-mtd@...ts.infradead.org>, <kernel@...utedevices.com>
Subject: Re: [PATCH v2 4/5] mtd: spinand: micron: OTP access for
 MT29F2G01ABAGD

Hi Martin,

mmkurbanov@...utedevices.com wrote on Mon, 14 Oct 2024 15:48:46 +0300:

> Hi Miquel,
> 
> On 10/1/24 12:31, Miquel Raynal wrote:
> 
> >> +#define MICRON_MT29F2G01ABAGD_OTP_PAGES			12
> >> +#define MICRON_MT29F2G01ABAGD_OTP_PAGE_SIZE		2176  
> > 
> > In the core we did add the data size and the OOB size to get the OTP
> > page size. I would prefer something dynamic here as well, otherwise the
> > implementation is very device specific for now reason?  

						no

> 
> Do you mean:
> otp_page_size = nanddev_page_size(nand) + nanddev_per_page_oobsize(nand)

Yes!

> >> +		size_t i = 0;
> >> +
> >> +		/* If all zeros, then the OTP area is locked. */
> >> +		while (i < buf_size && *(uint32_t *)(&buf[i]) == 0)
> >> +			i += 4;  
> > 
> > Shall we expect buf_size to always be a multiple of 4? (real question)  
> 
> This function is only for the nand flash MT29F2G01ABAGD that has a page
> size multiple of 4.

Ok.

Thanks,
Miquèl