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mtd: spi-nor-core: Detect Soft Reset sequence support from BFPT

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A Soft Reset sequence will return the flash to Power-on-Reset (POR)
state. It consists of two commands: Soft Reset Enable and Soft Reset.
Find out if the sequence is supported from BFPT DWORD 16.

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 00:47:23 +05:30 committed by Jagan Teki
parent b058f108d7
commit a1122a3d98
2 changed files with 7 additions and 0 deletions
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6
drivers/mtd/spi/spi-nor-core.c
View file

@ -153,6 +153,8 @@ struct sfdp_header {
#define BFPT_DWORD15_QER_SR2_BIT1_NO_RD (0x4UL << 20)
#define BFPT_DWORD15_QER_SR2_BIT1 (0x5UL << 20) /* Spansion */
#define BFPT_DWORD16_SOFT_RST BIT(12)
#define BFPT_DWORD18_CMD_EXT_MASK GENMASK(30, 29)
#define BFPT_DWORD18_CMD_EXT_REP (0x0UL << 29) /* Repeat */
#define BFPT_DWORD18_CMD_EXT_INV (0x1UL << 29) /* Invert */
@ -2104,6 +2106,10 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
break;
}
/* Soft Reset support. */
if (bfpt.dwords[BFPT_DWORD(16)] & BFPT_DWORD16_SOFT_RST)
nor->flags |= SNOR_F_SOFT_RESET;
/* Stop here if JESD216 rev B. */
if (bfpt_header->length == BFPT_DWORD_MAX_JESD216B)
return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt,

1
include/linux/mtd/spi-nor.h
View file

@ -248,6 +248,7 @@ enum spi_nor_option_flags {
SNOR_F_READY_XSR_RDY = BIT(4),
SNOR_F_USE_CLSR = BIT(5),
SNOR_F_BROKEN_RESET = BIT(6),
SNOR_F_SOFT_RESET = BIT(7),
};
struct spi_nor;