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92b779cd9f
The HSCIF RX FIFO may overflow when data are streaming from remote end into the HSCIF while U-Boot is still starting up. In that case, HSFSR bit RDF is set, but HSFDR field R is zero. This confuses .tstc callback into considering RX FIFO to be empty, which leads to .getc to be never invoked, even when user attempts to pass more input onto the command line. Fix this by considering the RDF flag in serial_rx_fifo_level(), which is called from .tstc in case of no errors. If RDF flag is set, trigger the .getc callback and let it clear the RX FIFO. Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>