From 3057fcef385348fe85173f1b0c824d89f1176f72 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@bootlin.com>
Date: Fri, 4 May 2018 21:24:31 +0200
Subject: [PATCH] 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: 8878b126df76 ("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>
---
drivers/mtd/nand/raw/nand_base.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 72f3a89da513..f28c3a555861 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -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;
--
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