[PATCH v3 1/9] mtd: spi-nor: improve macronix_quad_enable()

From: Cyrille Pitchen
Date: Mon Oct 24 2016 - 12:34:31 EST


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. Otherwise, a message is now printed telling we're setting the
non-volatile bit.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx>
Reviewed-by: Jagan Teki <jagan@xxxxxxxxxxxx>
---
drivers/mtd/spi-nor/spi-nor.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index d0fc165d7d66..5c87b2d99507 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1211,6 +1211,11 @@ 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;
+
+ /* Update the Quad Enable bit. */
+ dev_info(nor->dev, "setting Macronix Quad Enable (non-volatile) bit\n");
write_enable(nor);

write_sr(nor, val | SR_QUAD_EN_MX);
--
2.7.4