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Groups > linux.kernel > #1495511

[PATCH 1/9] 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. Otherwise, a message is now printed telling we're setting the
non-volatile bit.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 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

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[PATCH 0/9] mtd: spi-nor: parse SFDP tables to setup (Q)SPI memories Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 1/9] mtd: spi-nor: improve macronix_quad_enable() Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 8/9] mtd: spi-nor: add support to Macronix mx66l1g45g Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 4/9] mtd: spi-nor: remove unused set_quad_mode() function Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 7/9] mtd: spi-nor: parse SFDP 4-byte Address Instruction Table Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 5/9] mtd: m25p80: add support of dual and quad spi protocols to all commands Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 9/9] mtd: spi-nor: add support to SST sst26* QSPI memories Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 6/9] mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
  [PATCH 2/9] mtd: spi-nor: add an alternative method to support memory >16MiB Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200
    Re: [PATCH 2/9] mtd: spi-nor: add an alternative method to support  memory >16MiB Vignesh R <vigneshr@ti.com> - 2016-10-05 14:20 +0200
      Re: [PATCH 2/9] mtd: spi-nor: add an alternative method to support  memory >16MiB Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-05 15:00 +0200
        Re: [PATCH 2/9] mtd: spi-nor: add an alternative method to support  memory >16MiB Vignesh R <vigneshr@ti.com> - 2016-10-06 12:10 +0200
  [PATCH 3/9] mtd: spi-nor: add support of SPI protocols like SPI 1-2-2 and SPI 1-4-4 Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-10-04 18:40 +0200

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