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Commit 3057fcef authored by Boris Brezillon's avatar Boris Brezillon
Browse files

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: 8878b126 ("mtd: nand: add ->exec_op() implementation")
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Acked-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
parent a2ee41fd

drivers/mtd/nand/raw/nand_base.c

+5 −0
Original line number Diff line number Diff line
@@ -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;