sf: Read back and check once macronix quad bit set
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: NMugunthan V N <mugunthanvnm@ti.com> Signed-off-by: NJagan Teki <jteki@openedev.com>
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