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charset="utf-8" Continuous reading may result in multiple flash pages reading in one operation. Unfortunately, not all spinand controllers support such large reading. They will read less data. Unfortunately, the operation can't be continued. In this case: * disable continuous reading on this (not good enough) spi controller * repeat reading in regular mode. Signed-off-by: Mikhail Kshevetskiy --- drivers/mtd/nand/spi/core.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c index 02e322490110..8bbcc80aede0 100644 --- a/drivers/mtd/nand/spi/core.c +++ b/drivers/mtd/nand/spi/core.c @@ -430,8 +430,16 @@ static int spinand_read_from_cache_op(struct spinand_d= evice *spinand, * Dirmap accesses are allowed to toggle the CS. * Toggling the CS during a continuous read is forbidden. */ - if (nbytes && req->continuous) - return -EIO; + if (nbytes && req->continuous) { + /* + * Spi controller with broken support of continuous + * reading was detected. Disable future use of + * continuous reading and return -EAGAIN to retry + * reading within regular mode. + */ + spinand->cont_read_possible =3D false; + return -EAGAIN; + } } =20 if (req->datalen) @@ -899,10 +907,19 @@ static int spinand_mtd_read(struct mtd_info *mtd, lof= f_t from, =20 old_stats =3D mtd->ecc_stats; =20 - if (spinand_use_cont_read(mtd, from, ops)) + if (spinand_use_cont_read(mtd, from, ops)) { ret =3D spinand_mtd_continuous_page_read(mtd, from, ops, &max_bitflips); - else + if (ret =3D=3D -EAGAIN && !spinand->cont_read_possible) { + /* + * Spi controller with broken support of continuous + * reading was detected (see spinand_read_from_cache_op()), + * repeat reading in regular mode. + */ + ret =3D spinand_mtd_regular_page_read(mtd, from, ops, &max_bitflips); + } + } else { ret =3D spinand_mtd_regular_page_read(mtd, from, ops, &max_bitflips); + } =20 if (ops->stats) { ops->stats->uncorrectable_errors +=3D --=20 2.50.1