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Slight change to wdwait() to improve performance while not violating the

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ATA spec.

Submitted by:	John Dyson
This commit is contained in:
dg 1995-02-27 06:42:35 +00:00
parent f7a17fe3ac
commit 79c1c70f83
1 changed files with 7 additions and 2 deletions
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9
sys/i386/isa/wd.c
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@ -37,7 +37,7 @@ static int wdtest = 0;
* SUCH DAMAGE.
*
* from: @(#)wd.c 7.2 (Berkeley) 5/9/91
* $Id: wd.c,v 1.65 1995/02/04 19:39:36 phk Exp $
* $Id: wd.c,v 1.66 1995/02/26 01:15:30 bde Exp $
*/
/* TODO:
@ -1952,13 +1952,16 @@ wdwait(struct disk *du, u_char bits_wanted, int timeout)
wdc = du->dk_port;
timeout += POLLING;
/* dummy read for delay */
(void) inb(wdc + wd_status);
do {
#ifdef WD_COUNT_RETRIES
if (min_retries[du->dk_ctrlr] > timeout
|| min_retries[du->dk_ctrlr] == 0)
min_retries[du->dk_ctrlr] = timeout;
#endif
DELAY(5); /* ATA spec XXX NOT */
du->dk_status = status = inb(wdc + wd_status);
if (!(status & WDCS_BUSY)) {
if (status & WDCS_ERR) {
@ -1984,6 +1987,8 @@ wdwait(struct disk *du, u_char bits_wanted, int timeout)
* an extra msec won't matter.
*/
DELAY(1000);
else
DELAY(1);
} while (--timeout != 0);
return (-1);
}