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mtd: spi-nor-core: Enable octal DTR mode when possible

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Allow flashes to specify a hook to enable octal DTR mode. Use this hook
whenever possible to get optimal transfer speeds.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Pratyush Yadav 2021-06-26 00:47:21 +05:30 committed by Jagan Teki
parent b862765c7c
commit 6b808e0864
2 changed files with 33 additions and 0 deletions
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31
drivers/mtd/spi/spi-nor-core.c
View File

@ -2888,10 +2888,41 @@ static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
return nor->setup(nor, info, params);
}
/** spi_nor_octal_dtr_enable() - enable Octal DTR I/O if needed
* @nor: pointer to a 'struct spi_nor'
*
* Return: 0 on success, -errno otherwise.
*/
static int spi_nor_octal_dtr_enable(struct spi_nor *nor)
{
int ret;
if (!nor->octal_dtr_enable)
return 0;
if (!(nor->read_proto == SNOR_PROTO_8_8_8_DTR &&
nor->write_proto == SNOR_PROTO_8_8_8_DTR))
return 0;
ret = nor->octal_dtr_enable(nor);
if (ret)
return ret;
nor->reg_proto = SNOR_PROTO_8_8_8_DTR;
return 0;
}
static int spi_nor_init(struct spi_nor *nor)
{
int err;
err = spi_nor_octal_dtr_enable(nor);
if (err) {
dev_dbg(nor->dev, "Octal DTR mode not supported\n");
return err;
}
/*
* Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
* with the software protection bits set

2
include/linux/mtd/spi-nor.h
View File

@ -477,6 +477,7 @@ struct spi_flash {
* @flash_is_locked: [FLASH-SPECIFIC] check if a region of the SPI NOR is
* completely locked
* @quad_enable: [FLASH-SPECIFIC] enables SPI NOR quad mode
* @octal_dtr_enable: [FLASH-SPECIFIC] enables SPI NOR octal DTR mode.
* @priv: the private data
*/
struct spi_nor {
@ -524,6 +525,7 @@ struct spi_nor {
int (*flash_unlock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*flash_is_locked)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*quad_enable)(struct spi_nor *nor);
int (*octal_dtr_enable)(struct spi_nor *nor);
void *priv;
/* Compatibility for spi_flash, remove once sf layer is merged with mtd */