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

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Date:   Wed, 11 Mar 2020 08:56:42 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     masonccyang@...c.com.tw, allison@...utok.net,
        bbrezillon@...nel.org, 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

On Wed, 11 Mar 2020 08:43:04 +0100
Miquel Raynal <miquel.raynal@...tlin.com> wrote:

> Hi Mason,
> 
> masonccyang@...c.com.tw wrote on Wed, 11 Mar 2020 13:40:52 +0800:
> 
> > Hi Boris,
> >   
> > > > 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.

And don't forget to propagate the ->suspend() error code to the upper
layer.