mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-12-28 05:34:13 -05:00
Code Issues Packages Projects Releases Wiki Activity

mtd: spi-nor: sfdp: introduce smpt_read_dummy fixup hook

Browse Source 
SMPT contains config detection info that describes opcode, address, and
dummy cycles to read sector map config. The dummy cycles parameter can
be SMPT_CMD_READ_DUMMY_IS_VARIABLE and in that case nor->read_dummy
(initialized as 0) is used. In Infineon flash chips, Read Any Register
command with variable dummy cycle is defined in SMPT. S25Hx/S28Hx flash
has 0 dummy cycle by default to read volatile regiters and
nor->read_dummy can work. S25FS-S flash has 8 dummy cycles so we need a
hook that can fix dummy cycles with actually used value.

Inroduce smpt_read_dummy() in struct spi_nor_fixups. It is called when
the dummy cycle field in SMPT config detection is 'varialble'.

Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Tested-by: Marek Vasut <marek.vasut+renesas@mailbox.org> # S25FS512S
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
This commit is contained in:
Takahiro Kuwano
2025-11-05 16:47:58 +09:00
committed by Pratyush Yadav
parent 604cf6a401
commit 653f6def56
2 changed files with 19 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/mtd/spi-nor/core.h
View File

@@ -409,6 +409,8 @@ struct spi_nor_flash_parameter {
* flash parameters when information provided by the flash_info
* table is incomplete or wrong.
* @post_bfpt: called after the BFPT table has been parsed
* @smpt_read_dummy: called during SMPT table is being parsed. Used to fix the
* number of dummy cycles in read register ops.
* @post_sfdp: called after SFDP has been parsed (is also called for SPI NORs
* that do not support RDSFDP). Typically used to tweak various
* parameters that could not be extracted by other means (i.e.
@@ -426,6 +428,7 @@ struct spi_nor_fixups {
int (*post_bfpt)(struct spi_nor *nor,
const struct sfdp_parameter_header *bfpt_header,
const struct sfdp_bfpt *bfpt);
void (*smpt_read_dummy)(const struct spi_nor *nor, u8 *read_dummy);
int (*post_sfdp)(struct spi_nor *nor);
int (*late_init)(struct spi_nor *nor);
};

18
drivers/mtd/spi-nor/sfdp.c
View File

@@ -699,6 +699,17 @@ static u8 spi_nor_smpt_addr_nbytes(const struct spi_nor *nor, const u32 settings
}
}
static void spi_nor_smpt_read_dummy_fixups(const struct spi_nor *nor,
u8 *read_dummy)
{
if (nor->manufacturer && nor->manufacturer->fixups &&
nor->manufacturer->fixups->smpt_read_dummy)
nor->manufacturer->fixups->smpt_read_dummy(nor, read_dummy);
if (nor->info->fixups && nor->info->fixups->smpt_read_dummy)
nor->info->fixups->smpt_read_dummy(nor, read_dummy);
}
/**
* spi_nor_smpt_read_dummy() - return the configuration detection command read
* latency, in clock cycles.
@@ -711,8 +722,11 @@ static u8 spi_nor_smpt_read_dummy(const struct spi_nor *nor, const u32 settings)
{
u8 read_dummy = SMPT_CMD_READ_DUMMY(settings);
if (read_dummy == SMPT_CMD_READ_DUMMY_IS_VARIABLE)
return nor->read_dummy;
if (read_dummy == SMPT_CMD_READ_DUMMY_IS_VARIABLE) {
read_dummy = nor->read_dummy;
spi_nor_smpt_read_dummy_fixups(nor, &read_dummy);
}
return read_dummy;
}