[PATCH v7 0/4] mtd: cfi_cmdset_0002: Use chip_ready() for write on S29GL064N

[Miquel Raynal]

Hi Vignesh,

miquel.raynal at bootlin.com wrote on Mon, 11 Apr 2022 09:40:47 +0200:

> Hello,
> 
> regressions at leemhuis.info wrote on Sun, 10 Apr 2022 10:51:17 +0200:
> 
> > Hi, this is your Linux kernel regression tracker. Top-posting for once,
> > to make this easily accessible to everyone.
> > 
> > Miquel, Richard, Vignesh: what's up here? This patchset fixes a
> > regression. It's quite old, so it's not that urgent, but it looked like
> > nothing happened for two and a half week now. Or was progress made
> > somewhere?  
> 
> Vignesh, I'm waiting for your review/ack ;)

Are you still around? We wait for your ack on this.

> > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)  
> 
> Nice 'tool' :)
> 
> > P.S.: As the Linux kernel's regression tracker I'm getting a lot of
> > reports on my table. I can only look briefly into most of them and lack
> > knowledge about most of the areas they concern. I thus unfortunately
> > will sometimes get things wrong or miss something important. I hope
> > that's not the case here; if you think it is, don't hesitate to tell me
> > in a public reply, it's in everyone's interest to set the public record
> > straight.
> > 
> > #regzbot poke
> > 
> > On 23.03.22 18:04, Tokunori Ikegami wrote:  
> > > Since commit dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to
> > > check correct value") buffered writes fail on S29GL064N. This is
> > > because, on S29GL064N, reads return 0xFF at the end of DQ polling for
> > > write completion, where as, chip_good() check expects actual data
> > > written to the last location to be returned post DQ polling completion.
> > > Fix is to revert to using chip_good() for S29GL064N which only checks
> > > for DQ lines to settle down to determine write completion.
> > > 
> > > Fixes: dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to check correct value")
> > > Signed-off-by: Tokunori Ikegami <ikegami.t at gmail.com>
> > > Cc: stable at vger.kernel.org
> > > Link: https://lore.kernel.org/r/b687c259-6413-26c9-d4c9-b3afa69ea124@pengutronix.de/
> > > 
> > > Tokunori Ikegami (4):
> > >   mtd: cfi_cmdset_0002: Move and rename
> > >     chip_check/chip_ready/chip_good_for_write
> > >   mtd: cfi_cmdset_0002: Use chip_ready() for write on S29GL064N
> > >   mtd: cfi_cmdset_0002: Add S29GL064N ID definition
> > >   mtd: cfi_cmdset_0002: Rename chip_ready variables
> > > 
> > >  drivers/mtd/chips/cfi_cmdset_0002.c | 112 ++++++++++++++--------------
> > >  include/linux/mtd/cfi.h             |   1 +
> > >  2 files changed, 55 insertions(+), 58 deletions(-)
> > >     
> >   
> 
> 
> Thanks,
> Miquèl
> 
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Thanks,
Miquèl