diff options
| author | Stephen Boyd <[email protected]> | 2019-10-16 16:57:53 +0200 |
|---|---|---|
| committer | Viresh Kumar <[email protected]> | 2019-11-11 10:27:15 +0530 |
| commit | 25cb20a212a1f989385dfe23230817e69c62bee5 (patch) | |
| tree | a3b74abd3ad9d4d153a1943a7e78da910a0ec7ba /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | b19c23551be8de0d4e59fe6af70f10763e3cc595 (diff) | |
PM / OPP: Support adjusting OPP voltages at runtime
On some SoCs the Adaptive Voltage Scaling (AVS) technique is
employed to optimize the operating voltage of a device. At a
given frequency, the hardware monitors dynamic factors and either
makes a suggestion for how much to adjust a voltage for the
current frequency, or it automatically adjusts the voltage
without software intervention. Add an API to the OPP library for
the former case, so that AVS type devices can update the voltages
for an OPP when the hardware determines the voltage should
change. The assumption is that drivers like CPUfreq or devfreq
will register for the OPP notifiers and adjust the voltage
according to suggestions that AVS makes.
This patch is derived from [1] submitted by Stephen.
[1] https://lore.kernel.org/patchwork/patch/599279/
Signed-off-by: Stephen Boyd <[email protected]>
[Roger Lu: Changed to rcu less implementation]
Signed-off-by: Roger Lu <[email protected]>
[[email protected]: added handling of OPP min/max voltage]
Signed-off-by: Sylwester Nawrocki <[email protected]>
Signed-off-by: Viresh Kumar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
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