Date: Sun, 12 Jul 1998 22:32:14 -0700 (PDT) From: mburgett@awen.com To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: i386/7266: PSM detection problem with console switch Message-ID: <199807130532.WAA00553@firedraig.awen.com>
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>Number: 7266
>Category: i386
>Synopsis: PSM detection failure with Linksys console switch
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Jul 12 22:40:00 PDT 1998
>Last-Modified:
>Originator: Mike Burgett
>Organization:
None
>Release: FreeBSD 3.0-980709-SNAP i386
>Environment:
Copyright (c) 1992-1998 FreeBSD Inc.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
FreeBSD 3.0-980709-SNAP #3: Sun Jul 12 22:05:38 PDT 1998
root@firedraig.awen.com:/usr/src/sys/compile/FIREDRAIG
CPU: Pentium Pro (686-class CPU)
Origin = "GenuineIntel" Id = 0x617 Stepping=7
Features=0xfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV>
real memory = 268435456 (262144K bytes)
avail memory = 258809856 (252744K bytes)
FreeBSD/SMP: Multiprocessor motherboard
cpu0 (BSP): apic id: 1, version: 0x00040011, at 0xfee00000
cpu1 (AP): apic id: 0, version: 0x00040011, at 0xfee00000
io0 (APIC): apic id: 2, version: 0x00170011, at 0xfec00000
>Description:
With the Linksys SVIEW04 Console switch inline, PSM is not detected. Turning
on PSM debugging in the kernel revealed some functions returning PSM_RESEND,
and with failure code being sent if result != PSM_ACK. Adding a loop to
disble_aux_dev allows PSM to correctly detect, though some resends on status
checks are still returned as errors.
>How-To-Repeat:
Boot system with Linksys console switch attached, and system screen
selected or not. With debugging on, a failure should be observed at this
section of the function psmprobe() (I think, this code fragment occurs in
psm_reinitialize() as well.)
if (!enable_aux_dev(sc->kbdc) || !disable_aux_dev(sc->kbdc)) {
/* MOUSE ERROR */
restore_controller(sc->kbdc, command_byte);
if (verbose)
printf("psm%d: failed to enable the aux device.\n", unit);
endprobe(0);
}
The call to enable_aux_dev returns a good result, but the disable_aux_dev
returns a PSM_RESEND, which is interpreted as a failure, instead of being
retried. With the work-around below, the following can be observed:
psm0: current command byte:0047
psm: ENABLE_DEV return code:00fa
psm: DISABLE_DEV return code:00fe
psm: DISABLE_DEV return code:00fa
psm: SEND_AUX_DEV_STATUS return code:00fa
indicating that the first disable_aux_dev is still returing the
PSM_RESEND, but is succeeding on the second attempt. I suspect there
are other places where retry needs to be detected and implemented (I've
seen PSM_RESEND returned in the send_aux_command() call in
get_mouse_status().)
>Fix:
I did the following as a work around:
original:
static int
disable_aux_dev(KBDC kbdc)
{
int res;
res = send_aux_command(kbdc, PSMC_DISABLE_DEV);
if (verbose >= 2)
log(LOG_DEBUG, "psm: DISABLE_DEV return code:%04x\n", res);
return (res == PSM_ACK);
}
hack:
static int
disable_aux_dev(KBDC kbdc)
{
int res = PSM_RESEND;
int maxretry = 10; /* don't want to retry forever */
while ((res == PSM_RESEND) && (maxretry--))
{
res = send_aux_command(kbdc, PSMC_DISABLE_DEV);
if (verbose >= 2)
log(LOG_DEBUG, "psm: DISABLE_DEV return code:%04x\n", res);
}
return (res == PSM_ACK);
}
>Audit-Trail:
>Unformatted:
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