tools: kwboot: Do not call tcdrain() after each sent packet
Kwboot puts each xmodem packet to kernel queue, then waits until all bytes of that packet are transmitted over UART and then waits for xmodem reply until it is received into kernel queue. If some reply is received during the time we are waiting until all bytes are transmitted, then kernel puts them into the queue and returns it to kwboot in next read() call. So there is no need to wait (with tcdrain() function) until all bytes from xmodem packet are transmitted over UART, since any reply received either during that time or after is returned to kwboot with the next read(). Therefore do not call tcdrain() after each xmodem packet sent. Instead directly wait for any reply after putting xmodem packet into write kernel queue. This change could speed up xmodem transfer in case tcdrain() function waits for a longer time. Signed-off-by: NPali Rohár <pali@kernel.org> Reviewed-by: NMarek Behún <marek.behun@nic.cz> Reviewed-by: NStefan Roese <sr@denx.de>
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