Mario Limonciello authored 1 year ago and Mario Limonciello committed 1 year ago

When the system is on AC and profile is balanced put the EPP value
of balanced_performance.
When the system is on battery and profile is balanced put the EPP value
of balanced_power.

Mario Limonciello authored 1 year ago and Kate Hsuan committed 1 year ago

Make the change specifically when changing modes and only set powersave
for balance and powersaver profiles.

Mario Limonciello authored 1 year ago and Kate Hsuan committed 1 year ago

This mirrors the behavior used by Kernel 6.5 and later where amd-pstate
is configured to default into 'performance' by the kernel.  It's not
as useful in server to be changing it.

Link: https://github.com/torvalds/linux/commit/32f80b9adfdb43f8af248596724f59dde938a190

Mario Limonciello authored 1 year ago and Kate Hsuan committed 1 year ago

This is done by designating all drivers as CPU drivers or platform drivers.
One of each driver can be active at any given time.

When setting an active profile CPU driver is set first as this is less likely to have
failures. If failures occur setting the platform driver then the CPU driver is undone.

If both profiles are degraded then the string for the reason from both drivers will be
comma separated to be compatible with existing API and users.

This is leveraged from !123

Fixes: #107
Fixes: #125
Fixes: #124
Fixes: #122
Fixes: #129
Fixes: #131

Prajna Sariputra authored 1 year ago and Bastien Nocera committed 1 year ago

The AMD P-states driver has added support for active mode in kernel 6.3,
which exposes a similar interface for controlling energy performance
preference as the Intel P-state driver, with the same presets present,
so make use of it.

See:
https://www.kernel.org/doc/html/v6.3/admin-guide/pm/amd-pstate.html

Closes: #108