[PATCH v8 14/19] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT
From: Pratyush Yadav <hidden>
Date: 2020-05-22 22:42:19
Also in:
linux-mediatek, linux-spi, lkml
Subsystem:
memory technology devices (mtd), spi nor subsystem, the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Pratyush Yadav, Michael Walle, Linus Torvalds
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 <redacted> --- drivers/mtd/spi-nor/core.h | 1 + drivers/mtd/spi-nor/sfdp.c | 4 ++++ drivers/mtd/spi-nor/sfdp.h | 2 ++ 3 files changed, 7 insertions(+)
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 6338d32a0d77..79ce952c0539 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h@@ -26,6 +26,7 @@ enum spi_nor_option_flags { SNOR_F_HAS_SR_TB_BIT6 = BIT(11), SNOR_F_HAS_4BIT_BP = BIT(12), SNOR_F_HAS_SR_BP3_BIT6 = BIT(13), + SNOR_F_SOFT_RESET = BIT(14), }; struct spi_nor_read_command {
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index 9fd3d8d9a127..11109969dc3a 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c@@ -618,6 +618,10 @@ 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,
diff --git a/drivers/mtd/spi-nor/sfdp.h b/drivers/mtd/spi-nor/sfdp.h
index e15e30796d62..d1d43ee09a0a 100644
--- a/drivers/mtd/spi-nor/sfdp.h
+++ b/drivers/mtd/spi-nor/sfdp.h@@ -84,6 +84,8 @@ struct sfdp_bfpt { #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 */
--
2.26.2
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