Commit 8fcb215c authored by Joël Esponde's avatar Joël Esponde Committed by Greg Kroah-Hartman

mtd: spi-nor: fix spansion quad enable

commit 807c1625 upstream.

With the S25FL127S nor flash part, each writing to the configuration
register takes hundreds of ms. During that  time, no more accesses to
the flash should be done (even reads).

This commit adds a wait loop after the register writing until the flash
finishes its work.

This issue could make rootfs mounting fail when the latter was done too
much closely to this quad enable bit setting step. And in this case, a
driver as UBIFS may try to recover the filesystem and may broke it
completely.
Signed-off-by: default avatarJoël Esponde <joel.esponde@honeywell.com>
Signed-off-by: default avatarCyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: default avatarAmit Pundir <amit.pundir@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7dfea167
......@@ -1057,6 +1057,13 @@ static int spansion_quad_enable(struct spi_nor *nor)
return -EINVAL;
}
ret = spi_nor_wait_till_ready(nor);
if (ret) {
dev_err(nor->dev,
"timeout while writing configuration register\n");
return ret;
}
/* read back and check it */
ret = read_cr(nor);
if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
......
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