** Also affects: linux-bluefield (Ubuntu Jammy)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2078881
Title:
mlx-bootctl: support RTC battery status read and clear
Status in linux-bluefield package in Ubuntu:
New
Status in linux-bluefield source package in Jammy:
New
Bug description:
SRU Justification:
[Impact]
The RTC battery status is not directly accessible from the kernel user
space. The recent Nvidia UEFI added SMC to report the RTC battery
status and clear the status bit if needed.
[Fix]
* Added an rtc_battery entry in the bootctl driver.
* Read the rtc_battery entry will trigger an SMC call to read the RTC battery
status.
[Test Case]
* Check if the bootctl driver is loaded.
* Check the rtc_battery entry:
cat /sys/bus/platform/drivers/mlxbf-bootctl/rtc_battery
A value of 0x0 means RTC battery voltage is good.
A value of 0x80 means RTC battery voltage is low. The status bit is also
cleared after the read.
An error code will be return if this feature is missing from UEFI.
[Other]
* This code is likely to change depending on feedback we received from
maintainers.
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