linux-kernel - Re:Re: [PATCH v3] mtd: spi-nor: fix nor->addr_width when its value configured from SFDP does not match the actual width

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Date:   Mon, 24 Jun 2019 22:38:35 +0800 (CST)
From:   "Liu Xiang" <liuxiang_1999@....com>
To:     Tudor.Ambarus@...rochip.com
Cc:     liu.xiang6@....com.cn, linux-mtd@...ts.infradead.org,
        bbrezillon@...nel.org, richard@....at,
        linux-kernel@...r.kernel.org, marek.vasut@...il.com,
        computersforpeace@...il.com, dwmw2@...radead.org,
        nagasure@...inx.com, vigneshr@...com
Subject: Re:Re: [PATCH v3] mtd: spi-nor: fix nor->addr_width when its value
 configured from SFDP does not match the actual width



Hi, ta

Thanks for your advice! I will send the update patch in soon.




At 2019-06-22 19:49:25, Tudor.Ambarus@...rochip.com wrote:
>Hi, Liu,
>
>On 03/31/2019 10:42 AM, Liu Xiang wrote:
>
>> Some is25lp256 get BFPT_DWORD1_ADDRESS_BYTES_3_ONLY from BFPT table for
>> address width. But in actual fact the flash can support 4-byte address.
>> So we should fix it.
>
>It's better to be imperative. Substitute "So we should fix it" with something
>like "Use a post bfpt fixup hook to overwrite the address width advertised by
>the BFPT".
>
>>
>
>We'll need a fixes tag here.> Suggested-by: Boris Brezillon <bbrezillon@...nel.org>
>> Suggested-by: Vignesh Raghavendra <vigneshr@...com>
>
>When? If they didn't explicitly suggested this approach, lets drop the S-b tags.
>
>> Signed-off-by: Liu Xiang <liu.xiang6@....com.cn>
>> ---
>> 
>> Changes in v3:
>>  add a fixup for is25lp256 to solve the address width problem.
>> 
>>  drivers/mtd/spi-nor/spi-nor.c | 25 ++++++++++++++++++++++++-
>>  1 file changed, 24 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>> index 6e13bbd..d252a66 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -1682,6 +1682,28 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
>>  		.flags = SPI_NOR_NO_FR | SPI_S3AN,
>>  
>>  static int
>> +is25lp256_post_bfpt_fixups(struct spi_nor *nor,
>> +			   const struct sfdp_parameter_header *bfpt_header,
>> +			   const struct sfdp_bfpt *bfpt,
>> +			   struct spi_nor_flash_parameter *params)
>> +{
>> +	/*
>> +	 * IS25LP256 supports 4B opcodes.
>> +	 * Unfortunately, some devices get BFPT_DWORD1_ADDRESS_BYTES_3_ONLY
>                            ^ which devices, did you get a list from issi?
>
>> +	 * from BFPT table for address width. We should fix it.
>
>How about "IS25LP256 supports 4B opcodes, but the BFPT advertises a
>BFPT_DWORD1_ADDRESS_BYTES_3_ONLY address width. Overwrite the address width
>advertised by the BFPT."
>
>> +	 */
>> +	if ((bfpt->dwords[BFPT_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) ==
>> +		BFPT_DWORD1_ADDRESS_BYTES_3_ONLY)
>> +		nor->addr_width = 4;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct spi_nor_fixups is25lp256_fixups = {
>
>Naga will use "is25lp256_fixups" for the is25wp256 too, but it's not the case to
>change the name yet. All good here.
>
>I really want to have this in next, can I have an update in the next few days?
>
>Cheers,
>ta