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If WP signal is not connected, avoid setting SRWD bit while writing the SR during flash protection. Signed-off-by: Amit Kumar Mahapatra --- drivers/mtd/spi-nor/core.c | 3 +++ drivers/mtd/spi-nor/core.h | 1 + drivers/mtd/spi-nor/swp.c | 9 +++++++-- 3 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 0bb0ad14a2fc..81b57c51f41c 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -2864,6 +2864,9 @@ static void spi_nor_init_flags(struct spi_nor *nor) if (flags & NO_CHIP_ERASE) nor->flags |= SNOR_F_NO_OP_CHIP_ERASE; + if (of_property_read_bool(np, "broken-wp")) + nor->flags |= SNOR_F_BROKEN_WP; + if (flags & SPI_NOR_RWW && nor->info->n_banks > 1 && !nor->controller_ops) nor->flags |= SNOR_F_RWW; diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index 4fb5ff09c63a..6ac932eba913 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -132,6 +132,7 @@ enum spi_nor_option_flags { SNOR_F_SWP_IS_VOLATILE = BIT(13), SNOR_F_RWW = BIT(14), SNOR_F_ECC = BIT(15), + SNOR_F_BROKEN_WP = BIT(16), }; struct spi_nor_read_command { diff --git a/drivers/mtd/spi-nor/swp.c b/drivers/mtd/spi-nor/swp.c index 0ba716e84377..5d91f152c2cc 100644 --- a/drivers/mtd/spi-nor/swp.c +++ b/drivers/mtd/spi-nor/swp.c @@ -214,8 +214,13 @@ static int spi_nor_sr_lock(struct spi_nor *nor, loff_t ofs, uint64_t len) status_new = (status_old & ~mask & ~tb_mask) | val; - /* Disallow further writes if WP pin is asserted */ - status_new |= SR_SRWD; + /* + * Disallow further writes if WP pin is not broken. WP pin is + * considered broken only if the WP signal of the flash device + * is not connected. + */ + if (!(nor->flags & SNOR_F_BROKEN_WP)) + status_new |= SR_SRWD; if (!use_top) status_new |= tb_mask;