openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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 05f7835975
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().

Tested on 8-bit ONFI NAND (Micron MT29F32G08CBADAWP).

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-By: Pekon Gupta <pekon@ti.com>
This commit is contained in:
Brian Norris 2013-11-29 22:04:28 -08:00
parent 3dad2344e9
commit bd9c6e99b5
1 changed files with 3 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/mtd/nand/nand_base.c
View File

@ -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;