4.16-stable review patch. If anyone has any objections, please let me know.
------------------ From: Boris Brezillon <[email protected]> commit 3057fcef385348fe85173f1b0c824d89f1176f72 upstream. 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: <[email protected]> Signed-off-by: Boris Brezillon <[email protected]> Acked-by: Miquel Raynal <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/mtd/nand/nand_base.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -707,12 +707,17 @@ static void nand_wait_status_ready(struc */ 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;
