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

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Date:   Thu, 3 May 2018 05:28:32 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>
CC:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: rawnand: marvell: pass ms delay to wait_op

On 03/05/18 14:21, Chris Packham wrote:
> marvell_nfc_wait_op() expects the delay to be expressed in milliseconds
> but nand_sdr_timings uses picoseconds. Use PSEC_TO_MSEC when passing
> tPROG_max to marvell_nfc_wait_op().
> 
> Fixes: 02f26ecf8c772 ("mtd: nand: add reworked Marvell NAND controller driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>   drivers/mtd/nand/raw/marvell_nand.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> 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));
>   
>   	marvell_nfc_disable_hw_ecc(chip);
>   

Actually I'm not so sure about this patch. While passing the pico-second 
value for tPROG_max is clearly wrong and leads to seemingly indefinite 
hangs on some systems. Converting the times to micro-seconds leaves us 
with delays that are far too short.

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