Re: [PATCH v2 26/35] mtd: spi-nor: core: Introduce spi_nor_init_default_params()

[<Tudor.Ambarus@microchip.com>]

On 8/24/21 8:30 PM, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 27/07/21 07:52AM, Tudor Ambarus wrote:
>> Called for all flashes, regardless if they define SFDP tables or not.
>>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
>> ---
>>  drivers/mtd/spi-nor/core.c | 92 +++++++++++++++++++++-----------------
>>  1 file changed, 52 insertions(+), 40 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
>> index b3a01d7d6f0b..9193317f897d 100644
>> --- a/drivers/mtd/spi-nor/core.c
>> +++ b/drivers/mtd/spi-nor/core.c
>> @@ -2543,6 +2543,56 @@ static int spi_nor_setup(struct spi_nor *nor,
>>       return spi_nor_set_addr_width(nor);
>>  }
>>
>> +/**
>> + * spi_nor_init_default_params() - Default initialization of flash parameters
>> + * and settings. Done for all flashes, regardless is they define SFDP tables
>> + * or not.
>> + * @nor:     pointer to a 'struct spi_nor'.
>> + */
>> +static void spi_nor_init_default_params(struct spi_nor *nor)
>> +{
>> +     struct spi_nor_flash_parameter *params = nor->params;
>> +     const struct flash_info *info = nor->info;
>> +     struct device_node *np = spi_nor_get_flash_node(nor);
>> +
>> +     params->quad_enable = spi_nor_sr2_bit1_quad_enable;
>> +     params->set_4byte_addr_mode = spansion_set_4byte_addr_mode;
>> +     params->setup = spi_nor_default_setup;
>> +     params->otp.org = &info->otp_org;
>> +
>> +     /* Default to 16-bit Write Status (01h) Command */
>> +     nor->flags |= SNOR_F_HAS_16BIT_SR;
>> +
>> +     /* Set SPI NOR sizes. */
>> +     params->writesize = 1;
>> +     params->size = (u64)info->sector_size * info->n_sectors;
>> +     params->page_size = info->page_size;
> 
> I think these two lines should go in spi_nor_info_init_params() since
> you are using the nor info to initialize these parameters. Otherwise,
> what even is the difference between these two functions?

I think a better name for spi_nor_info_init_params() is
spi_nor_nonsfdp_info_init_params(). This method will eventually be called
just for non SFDP flashes. Check conversation in 18/35.

And maybe I should rename spi_nor_nonsfdp_flags_init to
spi_nor_nonsfdp_info_init_snor_f.
> 
>> +
>> +     if (!(info->flags & SPI_NOR_NO_FR)) {
>> +             /* Default to Fast Read for DT and non-DT platform devices. */
>> +             params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
>> +
>> +             /* Mask out Fast Read if not requested at DT instantiation. */
>> +             if (np && !of_property_read_bool(np, "m25p,fast-read"))
>> +                     params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
>> +     }
>> +
>> +     /* (Fast) Read settings. */
>> +     params->hwcaps.mask |= SNOR_HWCAPS_READ;
>> +     spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ],
>> +                               0, 0, SPINOR_OP_READ,
>> +                               SNOR_PROTO_1_1_1);
>> +
>> +     if (params->hwcaps.mask & SNOR_HWCAPS_READ_FAST)
>> +             spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_FAST],
>> +                                       0, 8, SPINOR_OP_READ_FAST,
>> +                                       SNOR_PROTO_1_1_1);
>> +     /* Page Program settings. */
>> +     params->hwcaps.mask |= SNOR_HWCAPS_PP;
>> +     spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
>> +                             SPINOR_OP_PP, SNOR_PROTO_1_1_1);
>> +}
>> +
>>  /**
>>   * spi_nor_manufacturer_init_params() - Initialize the flash's parameters and
>>   * settings based on MFR register and ->default_init() hook.
>> @@ -2609,43 +2659,8 @@ static void spi_nor_info_init_params(struct spi_nor *nor)
>>       struct spi_nor_flash_parameter *params = nor->params;
>>       struct spi_nor_erase_map *map = &params->erase_map;
>>       const struct flash_info *info = nor->info;
>> -     struct device_node *np = spi_nor_get_flash_node(nor);
>>       u8 i, erase_mask;
>>
>> -     /* Initialize default flash parameters and settings. */
>> -     params->quad_enable = spi_nor_sr2_bit1_quad_enable;
>> -     params->set_4byte_addr_mode = spansion_set_4byte_addr_mode;
>> -     params->setup = spi_nor_default_setup;
>> -     params->otp.org = &info->otp_org;
>> -
>> -     /* Default to 16-bit Write Status (01h) Command */
>> -     nor->flags |= SNOR_F_HAS_16BIT_SR;
>> -
>> -     /* Set SPI NOR sizes. */
>> -     params->writesize = 1;
>> -     params->size = (u64)info->sector_size * info->n_sectors;
>> -     params->page_size = info->page_size;
>> -
>> -     if (!(info->flags & SPI_NOR_NO_FR)) {
>> -             /* Default to Fast Read for DT and non-DT platform devices. */
>> -             params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
>> -
>> -             /* Mask out Fast Read if not requested at DT instantiation. */
>> -             if (np && !of_property_read_bool(np, "m25p,fast-read"))
>> -                     params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
>> -     }
>> -
>> -     /* (Fast) Read settings. */
>> -     params->hwcaps.mask |= SNOR_HWCAPS_READ;
>> -     spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ],
>> -                               0, 0, SPINOR_OP_READ,
>> -                               SNOR_PROTO_1_1_1);
>> -
>> -     if (params->hwcaps.mask & SNOR_HWCAPS_READ_FAST)
>> -             spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_FAST],
>> -                                       0, 8, SPINOR_OP_READ_FAST,
>> -                                       SNOR_PROTO_1_1_1);
>> -
>>       if (info->flags & SPI_NOR_DUAL_READ) {
>>               params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
>>               spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ_1_1_2],
>> @@ -2674,11 +2689,6 @@ static void spi_nor_info_init_params(struct spi_nor *nor)
>>                                         SNOR_PROTO_8_8_8_DTR);
>>       }
>>
>> -     /* Page Program settings. */
>> -     params->hwcaps.mask |= SNOR_HWCAPS_PP;
>> -     spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
>> -                             SPINOR_OP_PP, SNOR_PROTO_1_1_1);
>> -
>>       if (info->flags & SPI_NOR_OCTAL_DTR_PP) {
>>               params->hwcaps.mask |= SNOR_HWCAPS_PP_8_8_8_DTR;
>>               /*
>> @@ -2823,6 +2833,8 @@ static int spi_nor_init_params(struct spi_nor *nor)
>>       if (!nor->params)
>>               return -ENOMEM;
>>
>> +     spi_nor_init_default_params(nor);
>> +
>>       spi_nor_info_init_params(nor);
>>
>>       spi_nor_manufacturer_init_params(nor);
> 
> I am neutral towards this patch. I don't think it improves much, but at
> the same time it doesn't make anything worse either.

I think it helps readability. It splits spi_nor_init_params() into smaller logical chunks,
based on the type of initialization. We should usually avoid long methods where we can split
them in logical chunks, it makes the code pleasant to read.

Cheers,
ta
> 
> --
> Regards,
> Pratyush Yadav
> Texas Instruments Inc.
> 

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel