nand/davinci: make sure ECC calculation has really started
Due to a register glitch (result code <4 might show up right after the start-calculation-bit was set), make sure the ECC has really started. See 1c3275b6 in the kernel. Signed-off-by:Wolfram Sang <w.sang@pengutronix.de> Cc: Sandeep Paulraj <s-paulraj@ti.com>
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