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a00850107e
linux/drivers/watchdog
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Doug Anderson a00850107e watchdog: dw_wdt: pat the watchdog before enabling it 
On some dw_wdt implementations the "top" register may be initted to 0
at bootup.  In such a case, each "pat" of the watchdog will reset the
timer to 0xffff.  That's pretty short.

The input clock of the wdt can be any of a wide range of values.  On
an rk3288 system, I've seen the wdt clock be 24.75 MHz.  That means
each tick is ~40ns and we'll count to 0xffff in ~2.6ms.

Because of the above two facts, it's a really good idea to pat the
watchdog after initting the "top" register properly and before
enabling the watchdog.  If you don't then there's no way we'll get the
next heartbeat in time.

Jisheng Zhang fixed this problem on some dw_wdt versions by using the
TOP_INIT feature.  However, the dw_wdt on rk3288 doesn't have TOP_INIT
so it's a good idea to also pat the watchdog manually.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2015-02-17 21:33:43 +01:00
..
acquirewdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
advantechwdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
alim1535_wdt.c
alim7101_wdt.c watchdog: alim7101: register restart handler with kernel restart handler 2014-09-26 00:00:32 -07:00
ar7_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
at32ap700x_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
at91rm9200_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
at91sam9_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
at91sam9_wdt.h
ath79_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
bcm47xx_wdt.c watchdog: bcm47xx_wdt.c: add restart handler support 2015-02-17 21:33:27 +01:00
bcm63xx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
bcm2835_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
bcm_kona_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
bfin_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
booke_wdt.c powerpc: booke_wdt: Fix build error as a module 2014-10-20 20:44:22 +02:00
cadence_wdt.c watchdog: drop owner assignment from platform_drivers 2015-01-21 14:52:34 +01:00
coh901327_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
cpu5wdt.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
cpwd.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
da9052_wdt.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
da9055_wdt.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
da9063_wdt.c watchdog: da9063: Add restart handler support 2015-02-17 21:33:06 +01:00
davinci_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
diag288_wdt.c s390/watchdog: add support for LPAR operation (diag288) 2014-06-10 10:48:29 +02:00
dw_wdt.c watchdog: dw_wdt: pat the watchdog before enabling it 2015-02-17 21:33:43 +01:00
ep93xx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
eurotechwdt.c
f71808e_wdt.c
gef_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
geodewdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
gpio_wdt.c watchdog: gpio_wdt: Add "always_running" feature to GPIO watchdog 2015-02-17 21:33:22 +01:00
hpwdt.c watchdog: hpwdt: Fix initialization message in hpwdt.c 2015-02-17 21:32:10 +01:00
i6300esb.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
ib700wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ibmasr.c watchdog: fix checkpatch warnings and error 2014-03-31 13:31:06 +02:00
ie6xx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
imgpdc_wdt.c watchdog: ImgTec PDC Watchdog Timer Driver 2015-02-17 21:30:49 +01:00
imx2_wdt.c watchdog: imx2: Constify struct regmap_config and watchdog_ops 2015-02-17 21:31:06 +01:00
indydog.c watchdog: indydog: Simplify indydog_{start,stop} 2014-03-31 13:26:31 +02:00
intel_scu_watchdog.c watchdog: intel_scu_watchdog: Remove unused variable 2014-03-31 13:26:56 +02:00
intel_scu_watchdog.h
intel-mid_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
iop_wdt.c
it87_wdt.c watchdog: it87_wdt: add IT8783 ID 2015-02-17 21:32:08 +01:00
it8712f_wdt.c
iTCO_vendor_support.c
iTCO_vendor.h
iTCO_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ixp4xx_wdt.c
jz4740_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
Kconfig watchdog: w83627hf_wdt: Add support for NCT6791 and NCT6792 2015-02-17 21:33:37 +01:00
kempld_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ks8695_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
lantiq_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
m54xx_wdt.c
machzwd.c
Makefile watchdog: Add driver for Mediatek watchdog 2015-02-17 21:32:43 +01:00
max63xx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
mena21_wdt.c
menf21bmc_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
meson_wdt.c watchdog: drop owner assignment from platform_drivers 2015-01-21 14:52:34 +01:00
mixcomwd.c
moxart_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
mpc8xxx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
mtk_wdt.c watchdog: Add driver for Mediatek watchdog 2015-02-17 21:32:43 +01:00
mtx-1_wdt.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
mv64x60_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
nuc900_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
nv_tco.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
nv_tco.h
octeon-wdt-main.c MIPS: OCTEON: watchdog: don't jump to bootloader without entry address 2014-08-02 00:06:42 +02:00
octeon-wdt-nmi.S
of_xilinx_wdt.c watchdog: xilinx: Remove .owner field for driver 2014-10-20 20:43:42 +02:00
omap_wdt.c watchdog: Fix omap watchdogs to enable the magic close bit 2015-02-17 21:32:36 +01:00
omap_wdt.h
orion_wdt.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
pc87413_wdt.c watchdog: fix checkpatch warnings and error 2014-03-31 13:31:06 +02:00
pcwd_pci.c
pcwd_usb.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
pcwd.c
pika_wdt.c
pnx833x_wdt.c
pnx4008_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
qcom-wdt.c watchdog: qcom: register a restart notifier 2014-10-20 21:04:19 +02:00
rc32434_wdt.c
rdc321x_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
retu_wdt.c watchdog: Fix omap watchdogs to enable the magic close bit 2015-02-17 21:32:36 +01:00
riowd.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
rn5t618_wdt.c watchdog: add driver for Ricoh RN5T618 watchdog 2014-10-20 20:55:02 +02:00
rt2880_wdt.c watchdog: rt2880_wdt: minor clean up 2015-02-17 21:32:21 +01:00
s3c2410_wdt.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
sa1100_wdt.c
sb_wdog.c
sbc60xxwdt.c
sbc7240_wdt.c
sbc8360.c
sbc_epx_c3.c
sbc_fitpc2_wdt.c
sc520_wdt.c watchdog: sc520_wdt: Remove unused variable 2014-03-31 13:27:34 +02:00
sc1200wdt.c
sch311x_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
scx200_wdt.c
shwdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
sirfsoc_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
smsc37b787_wdt.c
softdog.c watchdog: fix checkpatch warnings and error 2014-03-31 13:31:06 +02:00
sp805_wdt.c watchdog: sp805: Set watchdog_device->timeout from ->set_timeout() 2014-06-10 21:47:47 +02:00
sp5100_tco.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
sp5100_tco.h
stmp3xxx_rtc_wdt.c stmp3xxx_rtc_wdt: Add suspend/resume PM support 2014-10-20 20:55:54 +02:00
sunxi_wdt.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
tegra_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ts72xx_wdt.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
twl4030_wdt.c watchdog: Fix omap watchdogs to enable the magic close bit 2015-02-17 21:32:36 +01:00
txx9wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ux500_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
via_wdt.c watchdog: via_wdt: replace del_timer by del_timer_sync 2014-06-10 21:38:25 +02:00
w83627hf_wdt.c watchdog: w83627hf_wdt: Add support for NCT6791 and NCT6792 2015-02-17 21:33:37 +01:00
w83877f_wdt.c
w83977f_wdt.c
wafer5823wdt.c
watchdog_core.c watchdog: core: Make dt "timeout-sec" property work on drivers w/out min/max 2014-01-28 19:07:56 +01:00
watchdog_core.h
watchdog_dev.c
wd501p.h
wdrtas.c
wdt285.c watchdog: wdt285: Fix variable type 2014-03-31 13:28:20 +02:00
wdt977.c
wdt_pci.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
wdt.c
wm831x_wdt.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
wm8350_wdt.c
xen_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00