Public bug reported:
[Impact]
Some HiSilicon SoCs do not implement registers that the cpufreq subsystem uses
to calculate current performance. This can result in undefined data being used
in internal calculations, and being exposed to userspace via sysfs.
[Test Case]
[Fix]
[Regression Risk]
The fix is a quirk restricted to specific SoCs. It does rely on firmware
behaving (overloading the desired_perf register w/ a correct actual perf
value), so changes in firmware could lead to regressions.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Status: New => In Progress
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1821620
Title:
Add HiSilicon SoC quirk for cpufreq
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
New
Status in linux source package in Cosmic:
New
Status in linux source package in Disco:
In Progress
Bug description:
[Impact]
Some HiSilicon SoCs do not implement registers that the cpufreq subsystem
uses to calculate current performance. This can result in undefined data being
used in internal calculations, and being exposed to userspace via sysfs.
[Test Case]
[Fix]
[Regression Risk]
The fix is a quirk restricted to specific SoCs. It does rely on firmware
behaving (overloading the desired_perf register w/ a correct actual perf
value), so changes in firmware could lead to regressions.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821620/+subscriptions
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