Message ID | 1476915078-98841-1-git-send-email-joel.esponde@honeywell.com |
---|---|
State | Superseded |
Headers | show
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diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index d0fc165..df43cd7 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1246,18 +1246,41 @@ static int spansion_quad_enable(struct spi_nor *nor) int ret; int quad_en = CR_QUAD_EN_SPAN << 8; + /* check quad enable bit + * as S25FL127S takes 200 ms to execute each write of SR & CR + * registers even if data is the same, write step will be shorted + * if not needed + */ + ret = read_cr(nor); + if (ret < 0) { + dev_err(nor->dev, "error %d reading CR\n", ret); + return ret; + } + if (ret & CR_QUAD_EN_SPAN) { + /* quad enable bit is already set */ + return 0; + } + + /* set SR & CR, enable quad I/O */ write_enable(nor); ret = write_sr_cr(nor, quad_en); if (ret < 0) { - dev_err(nor->dev, - "error while writing configuration register\n"); + dev_err(nor->dev, "error while writing SR and CR registers\n"); return -EINVAL; } - /* read back and check it */ + ret = spi_nor_wait_till_ready(nor); + if (ret) + return ret; + + /* read CR and check it */ ret = read_cr(nor); - if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) { + if (ret < 0) { + dev_err(nor->dev, "error %d reading CR\n", ret); + return ret; + } + if (!(ret & CR_QUAD_EN_SPAN)) { dev_err(nor->dev, "Spansion Quad bit not set\n"); return -EINVAL; }