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authorOza Pawandeep <quic_poza@quicinc.com>2023-10-03 10:33:33 -0700
committerWill Deacon <will@kernel.org>2023-10-04 16:31:27 +0100
commit4785aa8028536c2be656d22c74ec1995b97056f3 (patch)
treef95063294a84be0066324d15b6b05dcb213a95bb /drivers/acpi
parent471470bc7052d28ce125901877dd10e4c048e513 (diff)
cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer
ArmĀ® Functional Fixed Hardware Specification defines LPI states, which provide an architectural context loss flags field that can be used to describe the context that might be lost when an LPI state is entered. - Core context Lost - General purpose registers. - Floating point and SIMD registers. - System registers, include the System register based - generic timer for the core. - Debug register in the core power domain. - PMU registers in the core power domain. - Trace register in the core power domain. - Trace context loss - GICR - GICD Qualcomm's custom CPUs preserves the architectural state, including keeping the power domain for local timers active. when core is power gated, the local timers are sufficient to wake the core up without needing broadcast timer. The patch fixes the evaluation of cpuidle arch_flags, and moves only to broadcast timer if core context lost is defined in ACPI LPI. Fixes: a36a7fecfe60 ("ACPI / processor_idle: Add support for Low Power Idle(LPI) states") Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Oza Pawandeep <quic_poza@quicinc.com> Link: https://lore.kernel.org/r/20231003173333.2865323-1-quic_poza@quicinc.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/processor_idle.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index dc615ef6550a..3a34a8c425fe 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1217,8 +1217,7 @@ static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
strscpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
state->exit_latency = lpi->wake_latency;
state->target_residency = lpi->min_residency;
- if (lpi->arch_flags)
- state->flags |= CPUIDLE_FLAG_TIMER_STOP;
+ state->flags |= arch_get_idle_state_flags(lpi->arch_flags);
if (i != 0 && lpi->entry_method == ACPI_CSTATE_FFH)
state->flags |= CPUIDLE_FLAG_RCU_IDLE;
state->enter = acpi_idle_lpi_enter;