Re: [RESEND PATCH v3 02/20] mtd: spi-nor: Use nor->params

From: Vignesh Raghavendra
Date: Tue Aug 27 2019 - 00:31:19 EST



On 26/08/19 5:38 PM, Tudor.Ambarus@xxxxxxxxxxxxx wrote:
> From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
>
> The Flash parameters and settings are now stored in 'struct spi_nor'.
> Use this instead of the stack allocated params.
>
> Few functions stop passing pointer to params, as they can get it from
> 'struct spi_nor'. spi_nor_parse_sfdp() and children will keep passing
> pointer to params because of the roll-back mechanism: in case the
> parsing of SFDP fails, the legacy flash parameter and settings will be
> restored.
>
> Zeroing params is no longer needed because all SPI NOR users kzalloc
> 'struct spi_nor'.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> ---

Reviewed-by: Vignesh Raghavendra <vigneshr@xxxxxx>

Regards
Vignesh

> v3: collect R-b
>
> drivers/mtd/spi-nor/spi-nor.c | 46 ++++++++++++++++++-------------------------
> 1 file changed, 19 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index d35dc6a97521..e9b9cd70a999 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -2974,16 +2974,13 @@ static int spi_nor_spimem_check_pp(struct spi_nor *nor,
> * spi_nor_spimem_adjust_hwcaps - Find optimal Read/Write protocol
> * based on SPI controller capabilities
> * @nor: pointer to a 'struct spi_nor'
> - * @params: pointer to the 'struct spi_nor_flash_parameter'
> - * representing SPI NOR flash capabilities
> * @hwcaps: pointer to resulting capabilities after adjusting
> * according to controller and flash's capability
> */
> static void
> -spi_nor_spimem_adjust_hwcaps(struct spi_nor *nor,
> - const struct spi_nor_flash_parameter *params,
> - u32 *hwcaps)
> +spi_nor_spimem_adjust_hwcaps(struct spi_nor *nor, u32 *hwcaps)
> {
> + struct spi_nor_flash_parameter *params = &nor->params;
> unsigned int cap;
>
> /* DTR modes are not supported yet, mask them all. */
> @@ -4129,16 +4126,13 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
> return err;
> }
>
> -static int spi_nor_init_params(struct spi_nor *nor,
> - struct spi_nor_flash_parameter *params)
> +static int spi_nor_init_params(struct spi_nor *nor)
> {
> + struct spi_nor_flash_parameter *params = &nor->params;
> struct spi_nor_erase_map *map = &nor->erase_map;
> const struct flash_info *info = nor->info;
> u8 i, erase_mask;
>
> - /* Set legacy flash parameters as default. */
> - memset(params, 0, sizeof(*params));
> -
> /* Set SPI NOR sizes. */
> params->size = (u64)info->sector_size * info->n_sectors;
> params->page_size = info->page_size;
> @@ -4255,7 +4249,6 @@ static int spi_nor_init_params(struct spi_nor *nor,
> }
>
> static int spi_nor_select_read(struct spi_nor *nor,
> - const struct spi_nor_flash_parameter *params,
> u32 shared_hwcaps)
> {
> int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_READ_MASK) - 1;
> @@ -4268,7 +4261,7 @@ static int spi_nor_select_read(struct spi_nor *nor,
> if (cmd < 0)
> return -EINVAL;
>
> - read = &params->reads[cmd];
> + read = &nor->params.reads[cmd];
> nor->read_opcode = read->opcode;
> nor->read_proto = read->proto;
>
> @@ -4287,7 +4280,6 @@ static int spi_nor_select_read(struct spi_nor *nor,
> }
>
> static int spi_nor_select_pp(struct spi_nor *nor,
> - const struct spi_nor_flash_parameter *params,
> u32 shared_hwcaps)
> {
> int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_PP_MASK) - 1;
> @@ -4300,7 +4292,7 @@ static int spi_nor_select_pp(struct spi_nor *nor,
> if (cmd < 0)
> return -EINVAL;
>
> - pp = &params->page_programs[cmd];
> + pp = &nor->params.page_programs[cmd];
> nor->program_opcode = pp->opcode;
> nor->write_proto = pp->proto;
> return 0;
> @@ -4407,9 +4399,9 @@ static int spi_nor_select_erase(struct spi_nor *nor, u32 wanted_size)
> }
>
> static int spi_nor_setup(struct spi_nor *nor,
> - const struct spi_nor_flash_parameter *params,
> const struct spi_nor_hwcaps *hwcaps)
> {
> + struct spi_nor_flash_parameter *params = &nor->params;
> u32 ignored_mask, shared_mask;
> bool enable_quad_io;
> int err;
> @@ -4426,7 +4418,7 @@ static int spi_nor_setup(struct spi_nor *nor,
> * need to discard some of them based on what the SPI
> * controller actually supports (using spi_mem_supports_op()).
> */
> - spi_nor_spimem_adjust_hwcaps(nor, params, &shared_mask);
> + spi_nor_spimem_adjust_hwcaps(nor, &shared_mask);
> } else {
> /*
> * SPI n-n-n protocols are not supported when the SPI
> @@ -4442,7 +4434,7 @@ static int spi_nor_setup(struct spi_nor *nor,
> }
>
> /* Select the (Fast) Read command. */
> - err = spi_nor_select_read(nor, params, shared_mask);
> + err = spi_nor_select_read(nor, shared_mask);
> if (err) {
> dev_err(nor->dev,
> "can't select read settings supported by both the SPI controller and memory.\n");
> @@ -4450,7 +4442,7 @@ static int spi_nor_setup(struct spi_nor *nor,
> }
>
> /* Select the Page Program command. */
> - err = spi_nor_select_pp(nor, params, shared_mask);
> + err = spi_nor_select_pp(nor, shared_mask);
> if (err) {
> dev_err(nor->dev,
> "can't select write settings supported by both the SPI controller and memory.\n");
> @@ -4553,11 +4545,11 @@ static const struct flash_info *spi_nor_match_id(const char *name)
> int spi_nor_scan(struct spi_nor *nor, const char *name,
> const struct spi_nor_hwcaps *hwcaps)
> {
> - struct spi_nor_flash_parameter params;
> const struct flash_info *info = NULL;
> struct device *dev = nor->dev;
> struct mtd_info *mtd = &nor->mtd;
> struct device_node *np = spi_nor_get_flash_node(nor);
> + struct spi_nor_flash_parameter *params = &nor->params;
> int ret;
> int i;
>
> @@ -4639,7 +4631,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
> nor->clear_sr_bp = spi_nor_clear_sr_bp;
>
> /* Parse the Serial Flash Discoverable Parameters table. */
> - ret = spi_nor_init_params(nor, &params);
> + ret = spi_nor_init_params(nor);
> if (ret)
> return ret;
>
> @@ -4649,7 +4641,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
> mtd->type = MTD_NORFLASH;
> mtd->writesize = 1;
> mtd->flags = MTD_CAP_NORFLASH;
> - mtd->size = params.size;
> + mtd->size = params->size;
> mtd->_erase = spi_nor_erase;
> mtd->_read = spi_nor_read;
> mtd->_resume = spi_nor_resume;
> @@ -4688,18 +4680,18 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
> mtd->flags |= MTD_NO_ERASE;
>
> mtd->dev.parent = dev;
> - nor->page_size = params.page_size;
> + nor->page_size = params->page_size;
> mtd->writebufsize = nor->page_size;
>
> if (np) {
> /* If we were instantiated by DT, use it */
> if (of_property_read_bool(np, "m25p,fast-read"))
> - params.hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> + params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> else
> - params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
> + params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
> } else {
> /* If we weren't instantiated by DT, default to fast-read */
> - params.hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> + params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
> }
>
> if (of_property_read_bool(np, "broken-flash-reset"))
> @@ -4707,7 +4699,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
>
> /* Some devices cannot do fast-read, no matter what DT tells us */
> if (info->flags & SPI_NOR_NO_FR)
> - params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
> + params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
>
> /*
> * Configure the SPI memory:
> @@ -4716,7 +4708,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
> * - set the SPI protocols for register and memory accesses.
> * - set the Quad Enable bit if needed (required by SPI x-y-4 protos).
> */
> - ret = spi_nor_setup(nor, &params, hwcaps);
> + ret = spi_nor_setup(nor, hwcaps);
> if (ret)
> return ret;
>
>

--
Regards
Vignesh