linux-kernel - Re: [PATCH v2 3/7] mtd: spi_nor: Move manufacturer quad_enable() in ->default

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Message-ID: <f847222f-238d-f76c-398c-cf20f892bc08@microchip.com>
Date:   Sun, 25 Aug 2019 13:08:07 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...labora.com>
CC:     <marek.vasut@...il.com>, <vigneshr@...com>,
        <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/7] mtd: spi_nor: Move manufacturer quad_enable() in
 ->default_init()



On 08/25/2019 02:47 PM, Boris Brezillon wrote:
> External E-Mail
> 
> 
> On Sat, 24 Aug 2019 12:00:41 +0000
> <Tudor.Ambarus@...rochip.com> wrote:
> 
>> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
>>
>> The goal is to move the quad_enable manufacturer specific init in the
>> nor->manufacturer->fixups->default_init()
>>
>> The legacy quad_enable() implementation is spansion_quad_enable(),
>> select this method by default.
>>
>> Set specific manufacturer fixups->default_init() hooks to overwrite
>> the default quad_enable() implementation when needed.
>>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
>> ---
>>  drivers/mtd/spi-nor/spi-nor.c | 48 ++++++++++++++++++++++++++-----------------
>>  1 file changed, 29 insertions(+), 19 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>> index 27951e5a01e2..c9514dfd7d6d 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -4150,13 +4150,38 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
>>  	return err;
>>  }
>>  
>> +static void macronix_set_default_init(struct spi_nor *nor)
>> +{
>> +	nor->params.quad_enable = macronix_quad_enable;
> 
> Since it's now supposed to be the default QE implementation I'd
> recommend renaming the function into default_quad_enable() (this can be
> done in a separate patch).

You are referring to spansion_quad_enable. Yes, you made a patch that stops
prefixing generic functions with a manufacturer name, will follow.
https://patchwork.ozlabs.org/patch/1009264/

> 
> Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> 
>> +}
>> +
>> +static void st_micron_set_default_init(struct spi_nor *nor)
>> +{
>> +	nor->params.quad_enable = NULL;
>> +}
>> +
>>  /**
>>   * spi_nor_manufacturer_init_params() - Initialize the flash's parameters and
>> - * settings based on ->default_init() hook.
>> + * settings based on MFR register and ->default_init() hook.
>>   * @nor:	pointer to a 'struct spi-nor'.
>>   */
>>  static void spi_nor_manufacturer_init_params(struct spi_nor *nor)
>>  {
>> +	/* Init flash parameters based on MFR */
>> +	switch (JEDEC_MFR(nor->info)) {
>> +	case SNOR_MFR_MACRONIX:
>> +		macronix_set_default_init(nor);
>> +		break;
>> +
>> +	case SNOR_MFR_ST:
>> +	case SNOR_MFR_MICRON:
>> +		st_micron_set_default_init(nor);
>> +		break;
>> +
>> +	default:
>> +		break;
>> +	}
>> +
>>  	if (nor->info->fixups && nor->info->fixups->default_init)
>>  		nor->info->fixups->default_init(nor);
>>  }
>> @@ -4168,6 +4193,9 @@ static int spi_nor_init_params(struct spi_nor *nor)
>>  	const struct flash_info *info = nor->info;
>>  	u8 i, erase_mask;
>>  
>> +	/* Initialize legacy flash parameters and settings. */
>> +	params->quad_enable = spansion_quad_enable;
>> +
>>  	/* Set SPI NOR sizes. */
>>  	params->size = (u64)info->sector_size * info->n_sectors;
>>  	params->page_size = info->page_size;
>> @@ -4233,24 +4261,6 @@ static int spi_nor_init_params(struct spi_nor *nor)
>>  			       SPINOR_OP_SE);
>>  	spi_nor_init_uniform_erase_map(map, erase_mask, params->size);
>>  
>> -	/* Select the procedure to set the Quad Enable bit. */
>> -	if (params->hwcaps.mask & (SNOR_HWCAPS_READ_QUAD |
>> -				   SNOR_HWCAPS_PP_QUAD)) {
>> -		switch (JEDEC_MFR(info)) {
>> -		case SNOR_MFR_MACRONIX:
>> -			params->quad_enable = macronix_quad_enable;
>> -			break;
>> -
>> -		case SNOR_MFR_ST:
>> -		case SNOR_MFR_MICRON:
>> -			break;
>> -
>> -		default:
>> -			/* Kept only for backward compatibility purpose. */
>> -			params->quad_enable = spansion_quad_enable;
>> -			break;
>> -		}
>> -	}
>>  
>>  	spi_nor_manufacturer_init_params(nor);
>>  
> 
> 
>