On 2023-08-29 21:11, Oza Pawandeep wrote:
Arm® 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.
Isn't that what should be exposed by GTDT when ACPI_GTDT_ALWAYS_ON
is set on the relevant interrupt and EL? The arch timer already
deals with that.
Why do we need anything else?
Thanks,
M.
--
Jazz is not dead. It just smells funny...
