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Subject[PATCH 2/7] cpufreq: amd_pstate: add module parameter to load amd pstate EPP driver
The amd_pstate mode parameter will allow user to select which amd pstate
working mode as booting mode, amd_pstate instance or amd_pstate_epp instance.

1) amd_pstate instance is depending on the target operation mode.
2) amd_pstate_epp instance is depending on the set_policy operation mode.It
is also called active mode that AMD SMU has EPP algorithm to control the
CPU runtime frequency according to the EPP set value and workload.

Signed-off-by: Perry Yuan <>
drivers/cpufreq/amd-pstate.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index a2463f785322..451295284a26 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -58,6 +58,12 @@ module_param(shared_mem, bool, 0444);
"enable amd-pstate on processors with shared memory solution (false = disabled (default), true = enabled)");

+static bool epp_enabled = true;
+module_param(epp_enabled, bool, 0444);
+ "load amd_pstate or amd_pstate_epp (true = amd_pstate_epp driver instance (default), false = amd_pstate driver instance)");
static struct cpufreq_driver amd_pstate_driver;

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