#linux-amlogic on 2021-01-26 — irc logs at freenode.irclog.whitequark.org

2018-08-07 06:55 narmstrong changed the topic of #linux-amlogic to: Amlogic mainline kernel development discussion - our wiki http://linux-meson.com/ - ml linux-amlogic@lists.infradead.org - Publicly Logged on https://irclog.whitequark.org/linux-amlogic

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04:04 <BlueMatt> narmstrong: thanks!

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09:17 <benoitm974> Anyone succeeded in using the RTC clock ? I get timeout when I try to read or write to it with hwclock?

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10:39 <narmstrong> benoitm974: I don’t see what you’re speaking about

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15:18 <benoitm974> narmstrong: The dtb define a realtime clock using module meson-vrtc (it is also in the android the dtb dump) but it when you try to set or get time it fails.

15:18 <benoitm974> android dts:

15:18 <benoitm974> https://www.irccloud.com/pastebin/9oO92BqC/

15:18 <benoitm974> linux mainline:

15:18 <benoitm974> https://www.irccloud.com/pastebin/HpsCd7lM/

15:23 <narmstrong> benoitm974: the vrtc is a "Virtual RTC" only used for suspend wakeup

15:24 <narmstrong> is uses the system time, so you can't write anything to it

15:27 <benoitm974> but even reading timeout

15:28 <benoitm974> I have an issue on debian the systemd-timdated try to sync with it and timeout

15:28 <narmstrong> should not

15:28 <narmstrong> did you try with hwclock tool ?

15:29 <benoitm974> If it was virtual and working I would understand that doing a hwclock read should read the system time ... but it just timeout

15:30 <narmstrong> let me try on another system

15:31 <benoitm974> https://www.irccloud.com/pastebin/40GCQ9kg/

15:32 <benoitm974> even cat on /sys/class return old date

15:33 <narmstrong> hmm, maybe the API has changed

15:33 <benoitm974> https://www.irccloud.com/pastebin/kSx7CvyJ/

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15:54 <chewitt> I moved vrtc to /dev/rtc1 on boards that have a proper rtc chip else you see the same issue

15:55 <chewitt> most scripts/tooling assume /dev/rtc0 is a proper clocl

15:55 <chewitt> clock

15:55 <chewitt> I'm wondering if tooling is dumb enough to not-use /dev/rtc1 if /dev/rtc0 doesn't exist

16:10 <benoitm974> https://www.irccloud.com/pastebin/W7zMfCr6/

16:10 <benoitm974> it tries rtc0, rtc and misc/rtc only

16:11 <chewitt> at least it doesn't find 'the wrong clock' .. probably better than trying to use one that isn't a clock

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16:19 <narmstrong> oh I understand, hwclock uses select to wait for a clock tick, so yeah it can't work

16:20 <narmstrong> I wonder how this works on chips where the irq is not connected

16:23 <benoitm974> at least moving rtc0 to rtc1 allow debian systemd-timedated to ntp sync

16:23 <narmstrong> benoitm974: can you check CONFIG_RTC_INTF_DEV_UIE_EMUL is enabled in your kernel ?

16:23 <benoitm974> otherwise I was force to install chrony to sync time on top

16:24 <benoitm974> https://www.irccloud.com/pastebin/KZpisEck/

16:24 <chewitt> in my kernel # CONFIG_RTC_INTF_DEV_UIE_EMUL is not set

16:27 <benoitm974> I'm not sure you want to have a code reading your "virtual" clock multiple time per second just to offer ioctl in the correct RTC_UIE right ?

16:27 <narmstrong> well, it's the same if the physical RTC doesn't have an interrupt line connected to the SoC, there is no way to have a regular time update

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17:12 <benoitm974> quickly tested with the kernel option to 'y' same result:

17:12 <benoitm974> https://www.irccloud.com/pastebin/MQlfxsPO/

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