Public bug reported:
== Impact ==
Although we have CONFIG_RTC_HCTOSYS enabled and set CONFIG_RTC_HCTOSYS_DEVICE
to "rtc0", system time would only be set if the RTC driver is built-in. This
may not be an issue on most amd64 systems because CONFIG_RTC_DRV_CMOS is y for
amd64, however it is an issue for other architectures since there may not be a
proper RTC driver enabled as built-in. Also make every RTC driver that may be
used as built-in is not a good option.
== Fix ==
The commit is in mainline since v5.7:
commit f9b2a4d6a5f18e0aaf715206a056565c56889d9f
Author: Steve Muckle <smuc...@google.com>
Date: Wed Nov 6 11:46:25 2019 -0800
rtc: class: support hctosys from modular RTC drivers
Due to distribution constraints it may not be possible to statically
compile the required RTC driver into the kernel.
Expand RTC_HCTOSYS support to cover all RTC devices (statically compiled
or not) by checking at the end of RTC device registration whether the
time should be synced.
Signed-off-by: Steve Muckle <smuc...@google.com>
Link: https://lore.kernel.org/r/20191106194625.116692-1-smuc...@google.com
Signed-off-by: Alexandre Belloni <alexandre.bell...@bootlin.com>
== Risk of Regression ==
It's a clean cherry-pick for v5.4 and looks straight forward so risk should be
low.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Assignee: Jesse Sung (wenchien)
Status: In Progress
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Jesse Sung (wenchien)
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https://bugs.launchpad.net/bugs/1952077
Title:
System time doesn't sync with RTC time on boot
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