From: Tudor Ambarus Date: Thu, 26 Sep 2024 14:19:54 +0000 (+0800) Subject: mtd: spi-nor: sfdp: Get the 8D-8D-8D byte order from BFPT X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=46b6256a68b49d6400ceb43696a01a3203c11688;p=users%2Fjedix%2Flinux-maple.git mtd: spi-nor: sfdp: Get the 8D-8D-8D byte order from BFPT Parse BFPT in order to retrieve the byte order in 8D-8D-8D mode. This info flag will be used as a basis to determine whether there is byte swapping of data for SPI NOR flash in octal DTR mode. The controller driver will check whether byte swapping is supported to determine whether the corresponding operation are supported, thus avoiding the generation of unexpected data order. Merge Tudor's patch and add modifications for suiting newer version of Linux kernel. Reviewed-by: Michael Walle Signed-off-by: JaimeLiao Signed-off-by: AlvinZhou Link: https://lore.kernel.org/r/20240926141956.2386374-5-alvinzhou.tw@gmail.com Signed-off-by: Tudor Ambarus --- diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c index 5b1117265bd28..21727f9a4ac69 100644 --- a/drivers/mtd/spi-nor/sfdp.c +++ b/drivers/mtd/spi-nor/sfdp.c @@ -671,6 +671,10 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor, return -EOPNOTSUPP; } + /* Byte order in 8D-8D-8D mode */ + if (bfpt.dwords[SFDP_DWORD(18)] & BFPT_DWORD18_BYTE_ORDER_SWAPPED) + nor->flags |= SNOR_F_SWAP16; + 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 da0fe5aa9bb0a..f74a0eb339ea7 100644 --- a/drivers/mtd/spi-nor/sfdp.h +++ b/drivers/mtd/spi-nor/sfdp.h @@ -130,6 +130,7 @@ struct sfdp_bfpt { #define BFPT_DWORD18_CMD_EXT_INV (0x1UL << 29) /* Invert */ #define BFPT_DWORD18_CMD_EXT_RES (0x2UL << 29) /* Reserved */ #define BFPT_DWORD18_CMD_EXT_16B (0x3UL << 29) /* 16-bit opcode */ +#define BFPT_DWORD18_BYTE_ORDER_SWAPPED BIT(31) /* Byte order swapped in 8D-8D-8D mode */ struct sfdp_parameter_header { u8 id_lsb;