From: Brian Norris computersforpeace@gmail.com
Porting below commit from linux-tree, preserving original authorship & commit log commit bd9c6e99b58255b9de1982711ac9487c9a2f18be Author: Brian Norris computersforpeace@gmail.com mtd: nand: don't use read_buf for 8-bit ONFI transfers
Use a repeated read_byte() instead of read_buf(), since for x16 buswidth devices, we need to avoid the upper I/O[16:9] bits. See the following commit for reference:
commit 05f7835975dad6b3b517f9e23415985e648fb875 (from linux-tree) Author: Uwe Kleine-König u.kleine-koenig@pengutronix.de Date: Thu Dec 5 22:22:04 2013 +0100
mtd: nand: don't use {read,write}_buf for 8-bit transfers
Now, I think that all barriers to probing ONFI on x16 devices are removed, so remove the check from nand_flash_detect_onfi().
Signed-off-by: Pekon Gupta pekon@ti.com --- drivers/mtd/nand/nand_base.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 1ce55fd..5d3232c 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2582,7 +2582,7 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip, int *busw) { struct nand_onfi_params *p = &chip->onfi_params; - int i; + int i, j; int val;
/* Try ONFI for unknown chip or LP */ @@ -2593,7 +2593,8 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1); for (i = 0; i < 3; i++) { - chip->read_buf(mtd, (uint8_t *)p, sizeof(*p)); + for (j = 0; j < sizeof(*p); j++) + ((uint8_t *)p)[j] = chip->read_byte(mtd); if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) == le16_to_cpu(p->crc)) { pr_info("ONFI param page %d valid\n", i);