Hello everyone,
This is my second time requesting inclusion of a patch, please
point out any breach of protocol :-)
I have cherry-picked two mtd/nand patches on my local branch
of linux-3.14.y and I realized that these fixes might benefit
other users. (As far as I can tell, they landed in 3.15)
bd9c6e99b582 mtd: nand: don't use read_buf for 8-bit ONFI transfers
60c3bc1fd6f1 mtd: nand: fix erroneous read_buf call in nand_write_page_raw_syndrome
commit 60c3bc1fd6f1fa40b415ef5b83e2948a89a3d79c
Author: Boris BREZILLON <b.brezillon.dev@xxxxxxxxx>
Date: Sat Feb 1 19:10:28 2014 +0100
mtd: nand: fix erroneous read_buf call in nand_write_page_raw_syndrome
read_buf is called in place of write_buf in the
nand_write_page_raw_syndrome function.
Signed-off-by: Boris BREZILLON <b.brezillon.dev@xxxxxxxxx>
Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 79ed8ccf5065..3cb1cefcd926 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2002,7 +2002,7 @@ static int nand_write_page_raw_syndrome(struct mtd_info *mtd,
oob += chip->ecc.prepad;
}
- chip->read_buf(mtd, oob, eccbytes);
+ chip->write_buf(mtd, oob, eccbytes);
oob += eccbytes;
if (chip->ecc.postpad) {
commit bd9c6e99b58255b9de1982711ac9487c9a2f18be
Author: Brian Norris <computersforpeace@xxxxxxxxx>
Date: Fri Nov 29 22:04:28 2013 -0800
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
Author: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
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().
Tested on 8-bit ONFI NAND (Micron MT29F32G08CBADAWP).
Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
Tested-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>
Tested-By: Pekon Gupta <pekon@xxxxxx>
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 6281151e4cb7..79ed8ccf5065 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3065,7 +3065,7 @@ 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 */
@@ -3074,18 +3074,10 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
chip->read_byte(mtd) != 'F' || chip->read_byte(mtd) != 'I')
return 0;
- /*
- * ONFI must be probed in 8-bit mode or with NAND_BUSWIDTH_AUTO, not
- * with NAND_BUSWIDTH_16
- */
- if (chip->options & NAND_BUSWIDTH_16) {
- pr_err("ONFI cannot be probed in 16-bit mode; aborting\n");
- return 0;
- }
-
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)) {
break;
Regards.
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