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>

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 72f3a89da513e20dacf87b9943c6ac87db5a2e2f..f28c3a5558619fa22842ed2bffab7e0b4d7141a6 100644 (file)
--- 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;