mtk_ecc_wait_idle() logs when the encoder or decoder does not become idle, but returns void. Callers can therefore configure a non-idle ECC engine or read parity bytes after an unconfirmed encoder idle state. Return the idle poll result and propagate it from the enable and encode paths that require the engine to be idle before continuing. Fixes: 1d6b1e464950 ("mtd: mediatek: driver for MTK Smart Device") Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>