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[Blackfin] serial driver: fix bug - cache the bits of the LSR on systems where the LSR is read-to-clear

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Cache the bits of the LSR on systems where the LSR is read-to-clear
so that we can safely read the LSR in random places.  this fixes
older parts where break/framing/parity/overflow was not being detected
at all in PIO mode, and this fixes newer parts where
break/framing/parity/overflow was being reported all the time
without being cleared.

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Mike Frysinger 2007-12-24 19:40:05 +08:00 • committed by Bryan Wu
commit 0bcfd70ea1
6 changed files with 80 additions and 7 deletions
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