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

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Message-ID: <55e5672f-b3e5-4c14-b5e9-01cdde2f4472@alliedtelesis.co.nz>
Date:   Tue, 4 Oct 2022 21:21:37 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
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


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").
>>>>    drivers/mtd/nand/raw/marvell_nand.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/mtd/nand/raw/marvell_nand.c 
>>>> b/drivers/mtd/nand/raw/marvell_nand.c
>>>> index 2455a581fd70..b248c5f657d5 100644
>>>> --- a/drivers/mtd/nand/raw/marvell_nand.c
>>>> +++ b/drivers/mtd/nand/raw/marvell_nand.c
>>>> @@ -2672,7 +2672,7 @@ static int marvell_nand_chip_init(struct 
>>>> device *dev, struct marvell_nfc *nfc,
>>>>        chip->controller = &nfc->controller;
>>>>        nand_set_flash_node(chip, np);
>>>>    -    if (!of_property_read_bool(np, "marvell,nand-keep-config"))
>>>> +    if (of_property_read_bool(np, "marvell,nand-keep-config"))
>>>>            chip->options |= NAND_KEEP_TIMINGS;
>>>>           mtd = nand_to_mtd(chip)
>>
>> Thanks,
>> Miquèl