linux-kernel - Re: [PATCH v3 3/4] mtd: rawnand: Add support manufacturer specific suspend/resume operation

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Date:   Thu, 12 Mar 2020 09:45:16 +0800
From:   masonccyang@...c.com.tw
To:     "Miquel Raynal" <miquel.raynal@...tlin.com>
Cc:     allison@...utok.net, bbrezillon@...nel.org,
        "Boris Brezillon" <boris.brezillon@...labora.com>,
        frieder.schrempf@...tron.de, juliensu@...c.com.tw,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        rfontana@...hat.com, richard@....at, s.hauer@...gutronix.de,
        stefan@...er.ch, tglx@...utronix.de, vigneshr@...com,
        yuehaibing@...wei.com
Subject: Re: [PATCH v3 3/4] mtd: rawnand: Add support manufacturer specific suspend/resume
 operation

Hi Miquel,

> > > > diff --git a/include/linux/mtd/rawnand.h 
b/include/linux/mtd/rawnand.h
> > > > index bc2fa3c..c0055ed 100644
> > > > --- a/include/linux/mtd/rawnand.h
> > > > +++ b/include/linux/mtd/rawnand.h
> > > > @@ -1064,6 +1064,8 @@ struct nand_legacy {
> > > >   * @lock:      lock protecting the suspended field. Also used to
> > > >   *         serialize accesses to the NAND device.
> > > >   * @suspended:      set to 1 when the device is suspended, 0 when 

> > it's not.
> > > > + * @_suspend:      [REPLACEABLE] specific NAND device suspend 
> > operation
> > > > + * @_resume:      [REPLACEABLE] specific NAND device resume 
operation
> > > >   * @bbt:      [INTERN] bad block table pointer
> > > >   * @bbt_td:      [REPLACEABLE] bad block table descriptor for 
flash
> > > >   *         lookup.
> > > > @@ -1119,6 +1121,8 @@ struct nand_chip {
> > > > 
> > > >     struct mutex lock;
> > > >     unsigned int suspended : 1;
> > > > +   int (*_suspend)(struct nand_chip *chip);
> > > > +   void (*_resume)(struct nand_chip *chip); 
> > > 
> > > I thought we agreed on not prefixing new hooks with _ ? 
> > 
> > For [PATCH v2] series, you mentioned to drop the _ prefix 
> > of _lock/_unlock only and we finally patched to lock_area/unlock_area.
> > 
> 
> I missed this _, this is not something we want to add.
> 
> Also, when applying your patches I had several issues because they
> where not base on the last -rc1.
> 
> Finally, I think I forgot a line when patching manually so it produces
> a warning now.
> 
> I am dropping patch 3 and 4, I keep patch 1 and 2 which seem fine.
> 
> Please send a rebased and edited v4 for these, don't forget to drop the
> kbuildtest robot tag and please also follow these slightly edited
> commit logs:
> 
> 2/4
> 
>     mtd: rawnand: Add support for manufacturer specific suspend/resume 
operation
> 
>     Patch nand_suspend() & nand_resume() to let manufacturers overwrite
>     suspend/resume operations.
> 
> 3/4
> 
>     mtd: rawnand: macronix: Add support for deep power down mode
> 
>     Macronix AD series support deep power down mode for a minimum
>     power consumption state.
> 
>     Overlaod nand_suspend() & nand_resume() in Macronix specific code to
>     support deep power down mode.

okay, will resend [PATCH v4 xx/2] for suspend/resume operation with these 
commit logs.

> 
> Thanks,
> Miquèl

thanks for your review & comments.
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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