diff options
Diffstat (limited to 'sys/dev/sio/sio.c')
| -rw-r--r-- | sys/dev/sio/sio.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c index 59bcdad91ed8..066abc806ebf 100644 --- a/sys/dev/sio/sio.c +++ b/sys/dev/sio/sio.c @@ -2161,9 +2161,14 @@ comparam(tp, t) * latencies are reasonable for humans. Serial comms * protocols shouldn't expect anything better since modem * latencies are larger. + * + * We have to set the FIFO trigger point such that we + * don't overflow it accidently if a serial interrupt + * is delayed. At high speeds, FIFO_RX_HIGH does not + * leave enough slots free. */ com->fifo_image = t->c_ospeed <= 4800 - ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_HIGH; + ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH; #ifdef COM_ESP /* * The Hayes ESP card needs the fifo DMA mode bit set |