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SubjectRe: [PATCH v2] arm64: dts: ls1028a: Fix CPU idle fail.
On Thu, May 23, 2019 at 3:52 AM Shawn Guo <shawnguo@kernel.org> wrote:
>
> On Fri, May 17, 2019 at 12:57:53PM +0800, Ran Wang wrote:
> > PSCI spec define 1st parameter's bit 16 of function CPU_SUSPEND to
> > indicate CPU State Type: 0 for standby, 1 for power down. In this
> > case, we want to select standby for CPU idle feature. But current
> > setting wrongly select power down and cause CPU SUSPEND fail every
> > time. Need this fix.
> >
> > Fixes: 8897f3255c9c ("arm64: dts: Add support for NXP LS1028A SoC")
> > Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
>
> Leo, Bhaskar,
>
> Do you guys agree with it?

Sorry that I missed this email previously. I agree with this change.
CPU idle should use a low power state that could be waked up by
interrupts and that should be PW20. And Ran is right that both PW20
and PH20 are actually not power down state.

- Leo

>
> Shawn
>
> > ---
> > arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi | 18 +++++++++---------
> > 1 files changed, 9 insertions(+), 9 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > index b045812..bf7f845 100644
> > --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> > @@ -28,7 +28,7 @@
> > enable-method = "psci";
> > clocks = <&clockgen 1 0>;
> > next-level-cache = <&l2>;
> > - cpu-idle-states = <&CPU_PH20>;
> > + cpu-idle-states = <&CPU_PW20>;
> > };
> >
> > cpu1: cpu@1 {
> > @@ -38,7 +38,7 @@
> > enable-method = "psci";
> > clocks = <&clockgen 1 0>;
> > next-level-cache = <&l2>;
> > - cpu-idle-states = <&CPU_PH20>;
> > + cpu-idle-states = <&CPU_PW20>;
> > };
> >
> > l2: l2-cache {
> > @@ -53,13 +53,13 @@
> > */
> > entry-method = "arm,psci";
> >
> > - CPU_PH20: cpu-ph20 {
> > - compatible = "arm,idle-state";
> > - idle-state-name = "PH20";
> > - arm,psci-suspend-param = <0x00010000>;
> > - entry-latency-us = <1000>;
> > - exit-latency-us = <1000>;
> > - min-residency-us = <3000>;
> > + CPU_PW20: cpu-pw20 {
> > + compatible = "arm,idle-state";
> > + idle-state-name = "PW20";
> > + arm,psci-suspend-param = <0x0>;
> > + entry-latency-us = <2000>;
> > + exit-latency-us = <2000>;
> > + min-residency-us = <6000>;
> > };
> > };
> >
> > --
> > 1.7.1
> >

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