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authorBrian Norris <computersforpeace@gmail.com>2014-05-06 00:46:16 +0530
committerTom Rini <trini@ti.com>2014-06-06 17:46:01 -0400
commitb9ae609fdbb7f8149a13bb9c67006b7237cbf83e (patch)
tree78a9f137ddfbb17b32b684f863bd13d60c867518 /drivers/mtd
parent3f990dc83bc3197b17bd847241671917826152cc (diff)
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mtd: nand: don't use read_buf for 8-bit ONFI transfers
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>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/nand_base.c5
1 files 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);