The patch checks whether the Quad Enable bit is already set in the Status Register. If so, the function exits immediately with a successful return code.
Signed-off-by: Cyrille Pitchen <[email protected]> Reviewed-by: Jagan Teki <[email protected]> --- drivers/mtd/spi-nor/spi-nor.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index da7cd69d4857..1fd32b991eb7 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1216,6 +1216,9 @@ static int macronix_quad_enable(struct spi_nor *nor) val = read_sr(nor); if (val < 0) return val; + if (val & SR_QUAD_EN_MX) + return 0; + write_enable(nor); write_sr(nor, val | SR_QUAD_EN_MX); -- 2.7.4
