cpufreq/amd-pstate: Cache the firmware programmed EPP value

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At CPU EPP initialization, the private cpudata structure is allocated via
kzalloc, which means cpudata->cppc_req_cached is initialized to 0. This
makes the default cached EPP value 0 (AMD_CPPC_EPP_PERFORMANCE).

When initializing a system that defaults to performance EPP, the driver
attempts to configure the EPP via amd_pstate_set_epp(). Because the
requested EPP (0) matches the uninitialized cached value (0), the cache
guard check triggers, and the driver skips writing to the hardware.

Cache the firmware-programmed default EPP value in cppc_req_cached during
CPU EPP initialization. This saves on an unnecessary reprogramming later
when the EPP is first set.

Assisted-by: Antigravity:gemini-3.5-flash
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Marco Scardovi <scardracs@disroot.org>
Link: https://lore.kernel.org/r/20260609073042.81275-4-scardracs@disroot.org
Signed-off-by: Mario Limonciello <superm1@kernel.org>

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Marco Scardovi 2026-06-09 09:29:05 +02:00 • committed by Mario Limonciello

parent 9dfd13f80c

commit d0f4c1c8cb

1 changed files with 2 additions and 1 deletions

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drivers/cpufreq/amd-pstate.c

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