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In original driver was implemented support for half- and full-duplex modes, but it was not enabled. Instead of it ks8851_rx_1msg method always returns "true" that means "full-duplex" mode. This patch replaces hard-coded functionality with flexible solution that supports both SPI modes. Signed-off-by: Sergey Shcherbakov <shchers@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>