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