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: Cyrille Pitchen <[email protected]> Reviewed-by: Jagan Teki <[email protected]> Acked-by: Marek Vasut <[email protected]>
leemgs · Feb 10, 2017 · 32c90f1 · 32c90f1
1 parent e99ca98
commit 32c90f1
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
@@ -1305,6 +1305,9 @@ 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);