linux-kernel - Re: [PATCH] mtd: rawnand: marvell: Use correct logic for nand-keep-config

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Message-ID: <20221005093457.466e02a4@xps-13>
Date:   Wed, 5 Oct 2022 09:34:57 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "bbrezillon@...nel.org" <bbrezillon@...nel.org>,
        Tony O'Brien <Tony.OBrien@...iedtelesis.co.nz>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: rawnand: marvell: Use correct logic for
 nand-keep-config

Hi Chris,

Chris.Packham@...iedtelesis.co.nz wrote on Tue, 4 Oct 2022 21:21:37
+0000:

> On 5/10/22 08:41, Chris Packham wrote:
> >
> > On 4/10/22 23:02, Miquel Raynal wrote:  
> >> Hi Chris,
> >>
> >> Chris.Packham@...iedtelesis.co.nz wrote on Tue, 27 Sep 2022 02:54:40
> >> +0000:
> >>  
> >>> On 27/09/22 15:47, Chris Packham wrote:  
> >>>> From: Tony O'Brien <tony.obrien@...iedtelesis.co.nz>
> >>>>
> >>>> Originally the absence of the marvell,nand-keep-config property caused
> >>>> the setup_data_interface function to be provided. However when
> >>>> setup_data_interface was moved into nand_controller_ops the logic was
> >>>> unintentionally inverted. Update the logic so that only if the
> >>>> marvell,nand-keep-config property is present the bootloader NAND 
> >>>> config
> >>>> kept.
> >>>>
> >>>> Fixes: 7a08dbaedd36 ("mtd: rawnand: Move ->setup_data_interface() 
> >>>> to nand_controller_ops")
> >>>> Signed-off-by: Tony O'Brien <tony.obrien@...iedtelesis.co.nz>
> >>>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> >>>> ---
> >>>>
> >>>> Notes:
> >>>>       I think this is a bug that's been lurking for 4 years or so. 
> >>>> I'm not
> >>>>       sure that's particularly long in the life of an embedded 
> >>>> device but it
> >>>>       does make me wonder if there have been other bug reports 
> >>>> about it.
> >>>>             We noticed this because we had a bootloader that used 
> >>>> maxed out NAND
> >>>>       timings which made the time it took the kernel to do anything 
> >>>> on the
> >>>>       file system longer than we expected.  
> >>> I think there might be a similar logic inversion bug in
> >>> drivers/mtd/nand/raw/denali.c but I lack the ability to test for that
> >>> platform.  
> >> Agreed, the denali driver has the same issue. Could you please send a
> >> patch?  
> > Sure although it'll be compile tested only.  
> Actually looks like it was already fixed in commit d311e0c27b8f ("mtd: 
> rawnand: denali: get ->setup_data_interface() working again").

Ok, perfect.

Thanks,
Miquèl