diff options
| author | perry <perry@NetBSD.org> | 1999-03-25 02:17:38 +0000 |
|---|---|---|
| committer | perry <perry@NetBSD.org> | 1999-03-25 02:17:38 +0000 |
| commit | 8ade3b61ba3567e6947ac4fddc506bc75da5678e (patch) | |
| tree | 4d9d9ba0be3b35f7a54a8d585bcb9d2b82897836 /sys/dev/ic/lpt.c | |
| parent | 3db12eddbccd4119fe5f6836596020ab25aa14f4 (diff) | |
Add two #ifdef BROKEN_LPT_DELAY's in to the central write byte
& strobe cycle. These bracket DELAY()'s of BROKEN_LPT_DELAY
microseconds. This can be used to kludge around mysterious hangs and
reboots some users experience. The cause of these failures is still
not known, but is conjectured to be hardware bug originated failures
in the bus cycle.
Diffstat (limited to 'sys/dev/ic/lpt.c')
| -rw-r--r-- | sys/dev/ic/lpt.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/dev/ic/lpt.c b/sys/dev/ic/lpt.c index ade9a6e91b7..236b28ae8bf 100644 --- a/sys/dev/ic/lpt.c +++ b/sys/dev/ic/lpt.c @@ -1,4 +1,4 @@ -/* $NetBSD: lpt.c,v 1.53 1999/02/12 01:51:37 thorpej Exp $ */ +/* $NetBSD: lpt.c,v 1.54 1999/03/25 02:17:38 perry Exp $ */ /* * Copyright (c) 1993, 1994 Charles M. Hannum. @@ -389,7 +389,15 @@ lptintr(arg) u_char control = sc->sc_control; /* send char */ bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); +#ifdef BROKEN_LPT_DELAY + /* Kludge to prevent mysterious hangs and reboots. */ + DELAY(BROKEN_LPT_DELAY); +#endif bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); +#ifdef BROKEN_LPT_DELAY + /* Kludge to prevent mysterious hangs and reboots. */ + DELAY(BROKEN_LPT_DELAY); +#endif sc->sc_count--; bus_space_write_1(iot, ioh, lpt_control, control); sc->sc_state |= LPT_OBUSY; |
