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    USB: cypress_m8: Limit baud rate to <=4800 for USB low speed devices · 92983c21
    Mike Isely 提交于
    The cypress app note for the M8 states that for the USB low speed
    version of the part, throughput is effectively limited to 800
    bytes/sec.  So if we were to try a faster baud rate in such cases then
    we risk overrun errors on receive.  Best to just identify this case
    and limit the rate to 4800 baud or less (by ignoring any request to
    set a faster rate).  The old baud rate setting code was somewhat
    fragile; this change also hopefully makes it easier in the future to
    better checking / limiting.
    Signed-off-by: NMike Isely <isely@pobox.com>
    Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
    92983c21
cypress_m8.c 50.1 KB