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mtd: rawnand: Make sure we wait tWB before polling the STATUS reg 

NAND chips require a bit of time to take the NAND operation into
account and set the BUSY bit in the STATUS reg. Make sure we don't poll
the STATUS reg too early in nand_soft_waitrdy().

Fixes: 8878b126df ("mtd: nand: add ->exec_op() implementation")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
hifive-unleashed-5.1
Boris Brezillon 2018-05-04 21:24:31 +02:00
parent a2ee41fd95
commit 3057fcef38
1 changed files with 5 additions and 0 deletions
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5
drivers/mtd/nand/raw/nand_base.c
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@ -706,12 +706,17 @@ static void nand_wait_status_ready(struct mtd_info *mtd, unsigned long timeo)
*/
int nand_soft_waitrdy(struct nand_chip *chip, unsigned long timeout_ms)
{
const struct nand_sdr_timings *timings;
u8 status = 0;
int ret;
if (!chip->exec_op)
return -ENOTSUPP;
/* Wait tWB before polling the STATUS reg. */
timings = nand_get_sdr_timings(&chip->data_interface);
ndelay(PSEC_TO_NSEC(timings->tWB_max));
ret = nand_status_op(chip, NULL);
if (ret)
return ret;