diff options
| author |   Wim Van Sebroeck <wim@iguana.be> | 2017-09-09 17:41:24 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2017-09-09 17:41:24 +0200 |
| commit | fc61e83a29308601e6e8a0759e24fc8fe2122692 (patch) | |
| tree | 1c850a3c2cb972b42fef44008030f211ffa3d7ce | |
| parent | Merge tag 'platform-drivers-x86-v4.14-1' of git://git.infradead.org/linux-platform-drivers-x86 (diff) | |
| download | linux-dev-fc61e83a29308601e6e8a0759e24fc8fe2122692.tar.xz linux-dev-fc61e83a29308601e6e8a0759e24fc8fe2122692.zip | |
watchdog: Revert "iTCO_wdt: all versions count down twice"
This reverts commit 1fccb73011ea8a5fa0c6d357c33fa29c695139ea.
Reported as Bug 196509 - iTCO_wdt regression reboot before timeout expire
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| -rw-r--r-- | Documentation/watchdog/watchdog-parameters.txt | 2 | ||||
| -rw-r--r-- | drivers/watchdog/iTCO_wdt.c | 22 |
2 files changed, 13 insertions, 11 deletions
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt index b3526365ea8e..6f9d7b418917 100644 --- a/Documentation/watchdog/watchdog-parameters.txt +++ b/Documentation/watchdog/watchdog-parameters.txt @@ -117,7 +117,7 @@ nowayout: Watchdog cannot be stopped once started ------------------------------------------------- iTCO_wdt: heartbeat: Watchdog heartbeat in seconds. - (5<=heartbeat<=74 (TCO v1) or 1226 (TCO v2), default=30) + (2<heartbeat<39 (TCO v1) or 613 (TCO v2), default=30) nowayout: Watchdog cannot be stopped once started (default=kernel config parameter) ------------------------------------------------- diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c index c4f65873bfa4..347f0389b089 100644 --- a/drivers/watchdog/iTCO_wdt.c +++ b/drivers/watchdog/iTCO_wdt.c @@ -306,15 +306,16 @@ static int iTCO_wdt_ping(struct watchdog_device *wd_dev) iTCO_vendor_pre_keepalive(p->smi_res, wd_dev->timeout); - /* Reset the timeout status bit so that the timer - * needs to count down twice again before rebooting */ - outw(0x0008, TCO1_STS(p)); /* write 1 to clear bit */ - /* Reload the timer by writing to the TCO Timer Counter register */ - if (p->iTCO_version >= 2) + if (p->iTCO_version >= 2) { outw(0x01, TCO_RLD(p)); - else if (p->iTCO_version == 1) + } else if (p->iTCO_version == 1) { + /* Reset the timeout status bit so that the timer + * needs to count down twice again before rebooting */ + outw(0x0008, TCO1_STS(p)); /* write 1 to clear bit */ + outb(0x01, TCO_RLD(p)); + } spin_unlock(&p->io_lock); return 0; @@ -327,8 +328,11 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t) unsigned char val8; unsigned int tmrval; - /* The timer counts down twice before rebooting */ - tmrval = seconds_to_ticks(p, t) / 2; + tmrval = seconds_to_ticks(p, t); + + /* For TCO v1 the timer counts down twice before rebooting */ + if (p->iTCO_version == 1) + tmrval /= 2; /* from the specs: */ /* "Values of 0h-3h are ignored and should not be attempted" */ @@ -381,8 +385,6 @@ static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev) spin_lock(&p->io_lock); val16 = inw(TCO_RLD(p)); val16 &= 0x3ff; - if (!(inw(TCO1_STS(p)) & 0x0008)) - val16 += (inw(TCOv2_TMR(p)) & 0x3ff); spin_unlock(&p->io_lock); time_left = ticks_to_seconds(p, val16); |