Hi,
Here are the minutes I took, its always difficult to capture everything so I apologise if I missed something or misrepresented.
ACPI Power Management ---------------------
Not sure if it is ACPI core or driver that calls _PS? methods, Graeme thinks it is ACPI core. Must check.
PSCI transitions do not go through AML
Where people say "UEFI" when talking about hardware initialisation this actually means that by the time we enter kernel it will have been done. This does not actually mean UEFI needs to do this.
Fine grained means devices, so if two children shut off its upto firmware to work out and shut down the parent.
ASWG ASAP items, new GIC tables, flags for PSCI, GTDT memory mapped timers.
Is there a way to repeat runtime PM ability to not shutdown due to latency cost. Will need to be investigated.
If using an embedded power controller, what is the path for events.
There is a general lack of latency type control in ACPI. Also missing dependencies between devices and also devices states and C states.
At least one CPU is always in control of D-State transitions.
Improved CPU state change latency is in discussion in ASWG.
Discussion on extending the spec to allow for P-States on devices, this would give devfreq support for ACPI machines.
Dong Wei - Please participate in ASWG to improve the spec.
Graeme,
mine are in the etherpad, would you be able to merge yours in?
http://pad.linaro.org/p/LCA14-415
thanks a lot!
Andrea
On 6 March 2014 08:01, Graeme Gregory graeme.gregory@linaro.org wrote:
Hi,
Here are the minutes I took, its always difficult to capture everything so I apologise if I missed something or misrepresented.
ACPI Power Management
Not sure if it is ACPI core or driver that calls _PS? methods, Graeme thinks it is ACPI core. Must check.
PSCI transitions do not go through AML
Where people say "UEFI" when talking about hardware initialisation this actually means that by the time we enter kernel it will have been done. This does not actually mean UEFI needs to do this.
Fine grained means devices, so if two children shut off its upto firmware to work out and shut down the parent.
ASWG ASAP items, new GIC tables, flags for PSCI, GTDT memory mapped timers.
Is there a way to repeat runtime PM ability to not shutdown due to latency cost. Will need to be investigated.
If using an embedded power controller, what is the path for events.
There is a general lack of latency type control in ACPI. Also missing dependencies between devices and also devices states and C states.
At least one CPU is always in control of D-State transitions.
Improved CPU state change latency is in discussion in ASWG.
Discussion on extending the spec to allow for P-States on devices, this would give devfreq support for ACPI machines.
Dong Wei - Please participate in ASWG to improve the spec.
Linaro-acpi mailing list Linaro-acpi@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-acpi
-
Andrea Gallo -
Graeme Gregory