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2015-01-04 12:31 <larsc> pcercuei: yes, happy new year.
2015-01-04 12:31 <larsc> I'm having trouble with your watchdog driver
2015-01-04 12:31 <larsc> the system reboots after a while even though the watchdog is not enabled
2015-01-04 12:33 <pcercuei> the upstream version?
2015-01-04 12:33 <larsc> yes
2015-01-04 12:34 <pcercuei> and it doesn't happen when the watchdog module is not loaded?
2015-01-04 12:34 <larsc> yes
2015-01-04 12:35 <pcercuei> we have a couple of changes here: https://github.com/gcwnow/linux/commits/jz-3.18/drivers/watchdog/jz4740_wdt.c
2015-01-04 12:36 <pcercuei> but that means you need a "wdt" clock
2015-01-04 12:46 <larsc> hm, looks as if something actually does enable the wdt
2015-01-04 12:47 <larsc> and once it is enabled the gpios keyboard doesn't work anymore, strange
2015-01-04 12:47 <pcercuei> huh
2015-01-04 12:53 <larsc> does gmenu2x has any watchdog code?
2015-01-04 12:56 <mth> no, we have a watchdog daemon
2015-01-04 13:02 <larsc> I really wonder why enabling the watchdog kills the gpios
2015-01-04 13:03 <mth> the watchdog doesn't use any pins, so that's probably not where the interference is
2015-01-04 13:03 <mth> maybe it messes with the wrong clock?
2015-01-04 13:03 <mth> or an interrupt?
2015-01-04 13:04 <larsc> it looks like gpio_get_value() is still correct, but it doesn't generate any interrupts anymore
2015-01-04 13:05 <larsc> actually it seems to kill the timer interrupt
2015-01-04 13:26 <larsc> if I remove the 'writeb(0x1, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);' I still get the timer interrupts
2015-01-04 13:26 <larsc> otherwise they stop
2015-01-04 13:27 <larsc> strangely enough writing 0 to it again doesnt fix the issue
2015-01-04 13:28 <pcercuei> if you write 0x1, you write 0 to the upper 30 bits
2015-01-04 13:28 <pcercuei> is there anything in there?
2015-01-04 13:29 <larsc> not according to the datasheet
2015-01-04 13:33 <larsc> even if I replace the writeb(0x1, with writeb(0x0 it continuous to work
2015-01-04 13:39 <larsc> hm, switched things around to first setup the watchdog and then enable the watchdog clock in the tcu and things seem to work
2015-01-04 13:46 <larsc> only looked like it
2015-01-04 13:46 <larsc> really strange
2015-01-04 13:47 <pcercuei> we don't have those problems with the watchdog on jz4770
2015-01-04 13:48 <pcercuei> so that's indeed strange
2015-01-04 13:57 <larsc> hm, does the watchdog timer also generate an interrupt?
2015-01-04 13:59 <pcercuei> no
2015-01-04 13:59 <pcercuei> that wouldn't make sense
2015-01-04 14:01 <larsc> it wouldn't
2015-01-04 14:01 <larsc> but right now the whole thing doesn't make sense
2015-01-04 14:02 <pcercuei> disable devicetree :p
2015-01-04 14:03 <larsc> this is plain mainline
2015-01-04 14:20 <mth> the Ben has a matrix keyboard, right?
2015-01-04 14:20 <mth> wouldn't that be polled on a timer rather than have GPIO interrupts?
2015-01-04 14:23 <larsc> both
2015-01-04 14:24 <larsc> it looks as if for whatever reason tcu0 channel just stops
2015-01-04 14:25 <mth> the watchdog timer stop is in the same register as the tcu timer stop flags, but the code looks fine
2015-01-04 14:25 <mth> jz4740_timer_enable_watchdog
2015-01-04 14:26 <larsc> I double checked that already, in the register it is still enabled
2015-01-04 14:26 <larsc> also just calling jz4740_timer_enable_watchdog() doesn't do anything
2015-01-04 14:27 <larsc> problems only start once the watchdog is enabled in the watchdog core
2015-01-04 14:28 <larsc> if I change the timer code to not use tcu0 everything is fine
2015-01-04 14:35 <larsc> are you using the watchdog on the dingoo?
2015-01-04 14:36 <pcercuei> we didn't update the kernel for a long time
2015-01-04 14:38 <larsc> which tcu channels are used for pwm on the dingoo?
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2015-01-04 14:41 <pcercuei> PWM7 for the backlight
2015-01-04 15:00 <larsc> maybe they just forgot to tell us that the wdt hijacks tcu0
2015-01-04 15:02 <larsc> pcercuei: so, tomorrow morning 8 o'clock? ;)
2015-01-04 15:02 <pcercuei> probably not 8 o'clock
2015-01-04 15:04 <larsc> lots of work to do
2015-01-04 15:06 <pcercuei> it'll take time to even read the emails
2015-01-04 15:06 <larsc> all the ez posts
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