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sf: Read back and check once macronix quad bit set

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One macronix quad bit set using SR, it's good to
read back and check the written bit and also if
it's already been set check for the bit and return.

Cc: Vignesh R <vigneshr@ti.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Jagan Teki 2015-12-15 12:42:02 +05:30
parent ffecb0fc84
commit bfcdc3956d
1 changed files with 12 additions and 6 deletions
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18
drivers/mtd/spi/spi_flash.c
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@ -840,12 +840,18 @@ static int macronix_quad_enable(struct spi_flash *flash)
if (ret < 0)
return ret;
if (qeb_status & STATUS_QEB_MXIC) {
debug("SF: mxic: QEB is already set\n");
} else {
ret = write_sr(flash, STATUS_QEB_MXIC);
if (ret < 0)
return ret;
if (qeb_status & STATUS_QEB_MXIC)
return 0;
ret = write_sr(flash, STATUS_QEB_MXIC);
if (ret < 0)
return ret;
/* read SR and check it */
ret = read_sr(flash, &qeb_status);
if (!(ret >= 0 && (qeb_status & STATUS_QEB_MXIC))) {
printf("SF: Macronix SR Quad bit not clear\n");
return -EINVAL;
}
return ret;