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mtd: spi-nor: improve macronix_quad_enable()

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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 <cyrille.pitchen@atmel.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
This commit is contained in:
Cyrille Pitchen 2016-12-06 17:01:41 +01:00
parent e99ca98f1d
commit 32c90f1682
1 changed files with 3 additions and 0 deletions
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3
drivers/mtd/spi-nor/spi-nor.c
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@ -1305,6 +1305,9 @@ static int macronix_quad_enable(struct spi_nor *nor)
val = read_sr(nor); val = read_sr(nor);
if (val < 0) if (val < 0)
return val; return val;
if (val & SR_QUAD_EN_MX)
return 0;
write_enable(nor); write_enable(nor);
write_sr(nor, val | SR_QUAD_EN_MX); write_sr(nor, val | SR_QUAD_EN_MX);