diff options
| author | ache <ache@FreeBSD.org> | 1994-09-14 20:28:25 +0000 |
|---|---|---|
| committer | ache <ache@FreeBSD.org> | 1994-09-14 20:28:25 +0000 |
| commit | b95a84ec5205cccdbf604cc8b40fa49245c9a50f (patch) | |
| tree | 032194e3e3deb79026a4db52855458d78ede4a62 /sys/dev/mcd | |
| parent | f9fe204a451a48eede4b0c374ae8d13f1844f7c5 (diff) | |
| download | FreeBSD-src-b95a84ec5205cccdbf604cc8b40fa49245c9a50f.zip FreeBSD-src-b95a84ec5205cccdbf604cc8b40fa49245c9a50f.tar.gz | |
Increase transfer speed by waiting much less than 10ms after request
Submitted by: stark@sbstark.cs.sunysb.edu & slightly modifyed by me
Diffstat (limited to 'sys/dev/mcd')
| -rw-r--r-- | sys/dev/mcd/mcd.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sys/dev/mcd/mcd.c b/sys/dev/mcd/mcd.c index 30170bc..53b6fee 100644 --- a/sys/dev/mcd/mcd.c +++ b/sys/dev/mcd/mcd.c @@ -39,7 +39,7 @@ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: mcd.c,v 1.23 1994/09/03 16:48:12 ache Exp $ + * $Id: mcd.c,v 1.24 1994/09/06 21:56:09 se Exp $ */ static char COPYRIGHT[] = "mcd-driver (C)1993 by H.Veit & B.Moore"; @@ -195,7 +195,7 @@ struct isa_driver mcddriver = { mcd_probe, mcd_attach, "mcd" }; #define RDELAY_WAITREAD 800 #define MIN_DELAY 15 -#define DELAY_GETREPLY 1200000 +#define DELAY_GETREPLY 1300000 int mcd_attach(struct isa_device *dev) { @@ -952,6 +952,14 @@ nextblock: mcd_put(com_port,1); enable_intr(); + /* Spin briefly (<= 2ms) to avoid missing next block */ + for (i = 0; i < 20; i++) { + k = inb(port+mcd_xfer); + if (!(k & 2)) + goto got_it; + DELAY(100); + } + mbx->count = RDELAY_WAITREAD; timeout((timeout_func_t)mcd_doread, (caddr_t)MCD_S_WAITREAD,hz/100); /* XXX */ @@ -963,6 +971,7 @@ nextblock: if (!(k & 2)) { /* XXX */ MCD_TRACE("got data delay=%d\n", RDELAY_WAITREAD-mbx->count,0,0,0); + got_it: /* data is ready */ addr = bp->b_un.b_addr + mbx->skip; |
