linux-kernel - Re: [PATCH v13 2/8] mtd: rawnand: rockchip: NFC drivers for RK3308, RK2928 and others

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Date:   Mon, 2 Nov 2020 17:31:18 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Yifeng <yifeng.zhao@...k-chips.com>, richard@....at,
        vigneshr@...com, robh+dt@...nel.org, devicetree@...r.kernel.org,
        heiko@...ech.de, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v13 2/8] mtd: rawnand: rockchip: NFC drivers for RK3308,
 RK2928 and others

On 11/2/20 2:11 PM, Johan Jonker wrote:
> Hi,
> 
> On 11/2/20 2:07 PM, Miquel Raynal wrote:
>> Hi Johan, Yifeng
>>
>> Johan Jonker <jbx6244@...il.com> wrote on Mon, 2 Nov 2020 13:57:56
>> +0100:
>>
>>> Hi Yifeng,
>>>
>>> Don't poke with "ecc->bytes" ones it is set in rk_nfc_ecc_init(). It
>>> will not be noted by the MTD frame work or userspace. I think there's
>>> currently no way to let the user know that a different ECC must be used.
>>> Neither can the user set ECC on the fly.
>>>
>>> Example R/W flow:
>>>
>>>         nand_select_target()
>>> 	chip->ecc.write_page_raw()
>>> 	chip->ecc.write_page()
>>>
>>> [..]
>>>
>>> 	chip->ecc.read_page_raw()
>>> 	chip->ecc.read_page()
>>>         nand_deselect_target()
>>>
>>> A write/read with:
>>>
>>> rk_nfc_read_page_hwecc()
>>> rk_nfc_write_page_hwecc()
>>>
>>> or
>>>
>>> rk_nfc_read_page_raw()
>>> rk_nfc_write_page_raw()
>>>
>>> must end up with the same result. If we can't archive that, then we
>>> shouldn't offer RAW mode to the user for now. If Miquel agrees you
>>> should just get the driver ready now without these 2 functions and round
>>> things up.
>>
>> What about just not supporting the BootROM area if it was marked
>> "reserved" by the BRom in the DT?
> 
> Should we just fill the buffers with '0xff' for boot blocks?

(part 2) ;)
My fault....
Better use:

    if ((chip->options & NAND_IS_BOOT_MEDIUM) &&
        (page < (pages_per_blk * rknand->boot_blks))) {

	return -EIO;

    }


> 
>>
>> Raw accessors is really a nice and basic feature that I would like to
>> have in every new driver.
>>
>> Thanks,
>> Miquèl
>>
>