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Message-ID: <OFBC7B2DED.A4E37205-ON48258462.00332180-48258462.0033B2E6@mxic.com.tw>
Date: Mon, 26 Aug 2019 17:24:41 +0800
From: masonccyang@...c.com.tw
To: "Miquel Raynal" <miquel.raynal@...tlin.com>
Cc: bbrezillon@...nel.org, computersforpeace@...il.com,
dwmw2@...radead.org, frieder.schrempf@...tron.de,
juliensu@...c.com.tw, kstewart@...uxfoundation.org,
linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
marek.vasut@...il.com, richard@....at, tglx@...utronix.de,
vigneshr@...com
Subject: Re: [PATCH] Add support for Macronix NAND randomizer
Hi Miquel,
>
> Re: [PATCH] Add support for Macronix NAND randomizer
>
> Hi Mason,
>
> masonccyang@...c.com.tw wrote on Mon, 26 Aug 2019 10:52:31 +0800:
>
> > Hi Miquel,
> > >
> > > Mason Yang <masonccyang@...c.com.tw> wrote on Tue, 20 Aug 2019
13:53:48
> > > +0800:
> > >
> > > > Macronix NANDs support randomizer operation for user data
scrambled,
> > > > which can be enabled with a SET_FEATURE.
> > > >
> > > > User data written to the NAND device without randomizer is still
> > readable
> > > > after randomizer function enabled.
> > > > The penalty of randomizer are NOP = 1 instead of NOP = 4 and more
time
> > period
> > >
> > > please don't use 'NOP' here, use 'subpage accesses' instead,
otherwise
> > > people might not understand what it means while it has a real
impact.
> > >
> >
> > okay, understood.
> > will fix it by next submitting.
> >
> > > > is needed in program operation and entering deep power-down mode.
> > > > i.e., tPROG 300us to 340us(randomizer enabled)
> > > >
> > > > If subpage write not available with hardware ECC, for example,
> > > > NAND chip options NAND_NO_SUBPAGE_WRITE be set in driver and
> > > > randomizer function is recommended for high-reliability.
> > > > Driver checks byte 167 of Vendor Blocks in ONFI parameter page
table
> > > > to see if this high-reliability function is supported.
> > > >
> > >
> > > You did not flagged this patch as a v2 and forgot about the
changelog.
> >
> > will fix, thank you.
> >
> > > You did not listen to our comments in the last version neither. I
was
> > > open to a solution with a specific DT property for warned users but
I
> > > don't see it coming.
> >
> > Sorry I missed the previous version of "read-retry and randomizer
support"
> > patch.
> > Specific DT property is a good method to control it.
> >
> > For more high-reliability concern, randomizer is recommended to enable
by
> > default,
> > but sub-page write is not allowed when randomizer is enabled.
> >
> > Since most of HW ECC did not support sub-page write and we think
driver to
> > check
> > chip options flags is another simple and good way to enable
randomizer.
>
> Sorry but this is wrong. Several controllers and NAND chips support
> subpages. And changing now the behavior with such chips would entirely
> break the concerned setups (see Boris answer about UBI complaining if
> the subpage size changes).
okay, I see.
thanks for your information.
I will patch it based on your comments in the last version.
>
> Thanks,
> Miquèl
best regards,
Mason
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CONFIDENTIALITY NOTE:
This e-mail and any attachments may contain confidential information and/or personal data, which is protected by applicable laws. Please be reminded that duplication, disclosure, distribution, or use of this e-mail (and/or its attachments) or any part thereof is prohibited. If you receive this e-mail in error, please notify us immediately and delete this mail as well as its attachment(s) from your system. In addition, please be informed that collection, processing, and/or use of personal data is prohibited unless expressly permitted by personal data protection laws. Thank you for your attention and cooperation.
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