mtd: spi-nor: improve macronix_quad_enable()
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: NCyrille Pitchen <cyrille.pitchen@atmel.com> Reviewed-by: NJagan Teki <jagan@openedev.com> Acked-by: NMarek Vasut <marek.vasut@gmail.com>
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