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sf: Read back and check once spansion quad bit set

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One spansion quad bit set using CR, 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>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.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 12:28:39 +05:30
parent c56ae7519f
commit ffecb0fc84
1 changed files with 12 additions and 6 deletions
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18
drivers/mtd/spi/spi_flash.c
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@ -862,12 +862,18 @@ static int spansion_quad_enable(struct spi_flash *flash)
if (ret < 0)
return ret;
if (qeb_status & STATUS_QEB_WINSPAN) {
debug("SF: winspan: QEB is already set\n");
} else {
ret = write_cr(flash, STATUS_QEB_WINSPAN);
if (ret < 0)
return ret;
if (qeb_status & STATUS_QEB_WINSPAN)
return 0;
ret = write_cr(flash, STATUS_QEB_WINSPAN);
if (ret < 0)
return ret;
/* read CR and check it */
ret = read_cr(flash, &qeb_status);
if (!(ret >= 0 && (qeb_status & STATUS_QEB_WINSPAN))) {
printf("SF: Spansion CR Quad bit not clear\n");
return -EINVAL;
}
return ret;