On Tue, 16 Jul 2019 at 16:47, Sudeep Holla <sudeep.ho...@arm.com> wrote:
>
> On Mon, May 13, 2019 at 09:23:00PM +0200, Ulf Hansson wrote:
> > To enable the OS to manage last-man standing activities for a CPU, while an
> > idle state for a group of CPUs is selected, let's convert the Hikey
> > platform into using the hierarchical CPU topology layout.
> >
> > Cc: Wei Xu <xuw...@hisilicon.com>
> > Signed-off-by: Ulf Hansson <ulf.hans...@linaro.org>
> > ---
> >
> > Changes:
> > - None.
> >
> > ---
> > arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 87 ++++++++++++++++++++---
> > 1 file changed, 76 insertions(+), 11 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> > b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> > index 108e2a4227f6..36ff460f428f 100644
> > --- a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> > +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> > cpus {
>
> [...]
>
> > @@ -70,9 +128,8 @@
> > };
> >
> > CLUSTER_SLEEP: cluster-sleep {
> > - compatible = "arm,idle-state";
> > - local-timer-stop;
> > - arm,psci-suspend-param = <0x1010000>;
> > + compatible = "domain-idle-state";
> > + arm,psci-suspend-param = <0x1000000>;
> > entry-latency-us = <1000>;
> > exit-latency-us = <700>;
> > min-residency-us = <2700>;
>
> Again this must be original format and as per PSCI spec, your patch
> changes this cluster sleep state into cluster retention state which I
> think is not what you intended.
If the hierarchical topology is used, the parameter for cluster states
are ORed with the deepest idle state for the CPU.
CPU_SLEEP: 0x0010000
CLUSTER_SLEEP: 0x1000000
After the ORed operation
CLUSTER_SLEEP: 0x1010000
So, this indeed works as expected.
However, are you saying that ORing the state parameters like above has
other problems? I am reading your other replies...
Kind regards
Uffe
