On 12/06/2016 05:01 PM, Cyrille Pitchen wrote: > 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.
Performance optimization I presume ? Acked-by: Marek Vasut <[email protected]> > 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); > -- Best regards, Marek Vasut
