linux-kernel - Re: [PATCH] mtd: rawnand: marvell: pass ms delay to wait

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Message-ID: <20180503100114.16d573dc@xps13>
Date:   Thu, 3 May 2018 10:01:14 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>,
        Richard Weinberger <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] mtd: rawnand: marvell: pass ms delay to wait_op

Hi Boris, Chris,

> > > diff --git a/drivers/mtd/nand/raw/marvell_nand.c b/drivers/mtd/nand/raw/marvell_nand.c
> > > index 1d779a35ac8e..e4b964fd40d8 100644
> > > --- a/drivers/mtd/nand/raw/marvell_nand.c
> > > +++ b/drivers/mtd/nand/raw/marvell_nand.c
> > > @@ -1074,7 +1074,7 @@ static int marvell_nfc_hw_ecc_hmg_do_write_page(struct nand_chip *chip,
> > >   		return ret;
> > >   
> > >   	ret = marvell_nfc_wait_op(chip,
> > > -				  chip->data_interface.timings.sdr.tPROG_max);
> > > +				  PSEC_TO_MSEC(chip->data_interface.timings.sdr.tPROG_max));
> > >   	return ret;
> > >   }
> > >   
> > > @@ -1494,7 +1494,7 @@ static int marvell_nfc_hw_ecc_bch_write_page(struct mtd_info *mtd,
> > >   	}
> > >   
> > >   	ret = marvell_nfc_wait_op(chip,
> > > -				  chip->data_interface.timings.sdr.tPROG_max);
> > > +				  PSEC_TO_MSEC(chip->data_interface.timings.sdr.tPROG_max));
> > >   

[...]

> > The old pxa3xx driver had hard coded 200ms delays. These delays now work 
> > out to 1ms which seems every bit as wrong as 600000000ms.  

When the 'keep-config' property is populated, the
->setup_data_interface() hook of the driver is not shown to the core,
which leads to not "updating" the timings like tPROG_max.

While it worked with the old driver that hardcoded this delay, this
might not work anymore with the current driver because it expects
timings.sdr.tPROG_max to be != 0 (and PSEC_TO_MSEC(0) also returns 0).

This is probably something to fix.

Regards,
Miquèl

-- 
Miquel Raynal, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com