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Groups > linux.kernel > #1526710
| From | Cyrille Pitchen <cyrille.pitchen@atmel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v4 1/8] mtd: spi-nor: improve macronix_quad_enable() |
| Date | 2016-11-21 15:20 +0100 |
| Message-ID | <sFXBU-2h6-41@gated-at.bofh.it> (permalink) |
| References | <sFXBT-2h6-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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> Reviewed-by: Jagan Teki <jagan@openedev.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..7ff807211e1e 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_dbg(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 v4 0/8] mtd: spi-nor: parse SFDP tables to setup (Q)SPI memories Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-11-21 15:20 +0100 [PATCH v4 3/8] mtd: spi-nor: add an alternative method to support memory >16MiB Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-11-21 15:20 +0100 [PATCH v4 5/8] mtd: spi-nor: remove unused set_quad_mode() function Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-11-21 15:20 +0100 [PATCH v4 8/8] mtd: spi-nor: parse SFDP 4-byte Address Instruction Table Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-11-21 15:20 +0100 [PATCH v4 7/8] mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-11-21 15:20 +0100 [PATCH v4 1/8] mtd: spi-nor: improve macronix_quad_enable() Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-11-21 15:20 +0100 [PATCH v4 4/8] mtd: spi-nor: add support of SPI protocols like SPI 1-2-2 and SPI 1-4-4 Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-11-21 15:20 +0100
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