| Message ID | 20191108153719.3166002-1-thierry.reding@gmail.com |
|---|---|
| State | Deferred |
| Headers | show |
| Series | arm64: tegra: Disable secondary CPUs on Tegra194 | expand |
On Fri, Nov 08, 2019 at 04:37:19PM +0100, Thierry Reding wrote: > From: Thierry Reding <treding@nvidia.com> > > According to ePAPR, CPUs that are quiescent should have the "status" > property of the corresponding device tree node set to "disabled". Since > all but the boot CPU are in a quiescent state on boot, mark all > secondary CPUs as "disabled". I think it might be best to leave this as-is, as we haven't done this for other dts, and the OS doesn't actually require or consume this regardless. Adding this to all the Dts seems like unnecessary churn, and we can fix the DT spec instead. Thanks, Mark. > > Note that this does not have an impact on SMP. Linux will still be able > to boot these secondary CPUs like before. > > Signed-off-by: Thierry Reding <treding@nvidia.com> > --- > arch/arm64/boot/dts/nvidia/tegra194.dtsi | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi > index 59485976db64..ea165b2998f9 100644 > --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi > +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi > @@ -1661,6 +1661,7 @@ > compatible = "nvidia,tegra194-carmel"; > device_type = "cpu"; > reg = <0x001>; > + status = "disabled"; > enable-method = "psci"; > i-cache-size = <131072>; > i-cache-line-size = <64>; > @@ -1675,6 +1676,7 @@ > compatible = "nvidia,tegra194-carmel"; > device_type = "cpu"; > reg = <0x100>; > + status = "disabled"; > enable-method = "psci"; > i-cache-size = <131072>; > i-cache-line-size = <64>; > @@ -1689,6 +1691,7 @@ > compatible = "nvidia,tegra194-carmel"; > device_type = "cpu"; > reg = <0x101>; > + status = "disabled"; > enable-method = "psci"; > i-cache-size = <131072>; > i-cache-line-size = <64>; > @@ -1703,6 +1706,7 @@ > compatible = "nvidia,tegra194-carmel"; > device_type = "cpu"; > reg = <0x200>; > + status = "disabled"; > enable-method = "psci"; > i-cache-size = <131072>; > i-cache-line-size = <64>; > @@ -1717,6 +1721,7 @@ > compatible = "nvidia,tegra194-carmel"; > device_type = "cpu"; > reg = <0x201>; > + status = "disabled"; > enable-method = "psci"; > i-cache-size = <131072>; > i-cache-line-size = <64>; > @@ -1731,6 +1736,7 @@ > compatible = "nvidia,tegra194-carmel"; > device_type = "cpu"; > reg = <0x300>; > + status = "disabled"; > enable-method = "psci"; > i-cache-size = <131072>; > i-cache-line-size = <64>; > @@ -1745,6 +1751,7 @@ > compatible = "nvidia,tegra194-carmel"; > device_type = "cpu"; > reg = <0x301>; > + status = "disabled"; > enable-method = "psci"; > i-cache-size = <131072>; > i-cache-line-size = <64>; > -- > 2.23.0 >
diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi index 59485976db64..ea165b2998f9 100644 --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi @@ -1661,6 +1661,7 @@ compatible = "nvidia,tegra194-carmel"; device_type = "cpu"; reg = <0x001>; + status = "disabled"; enable-method = "psci"; i-cache-size = <131072>; i-cache-line-size = <64>; @@ -1675,6 +1676,7 @@ compatible = "nvidia,tegra194-carmel"; device_type = "cpu"; reg = <0x100>; + status = "disabled"; enable-method = "psci"; i-cache-size = <131072>; i-cache-line-size = <64>; @@ -1689,6 +1691,7 @@ compatible = "nvidia,tegra194-carmel"; device_type = "cpu"; reg = <0x101>; + status = "disabled"; enable-method = "psci"; i-cache-size = <131072>; i-cache-line-size = <64>; @@ -1703,6 +1706,7 @@ compatible = "nvidia,tegra194-carmel"; device_type = "cpu"; reg = <0x200>; + status = "disabled"; enable-method = "psci"; i-cache-size = <131072>; i-cache-line-size = <64>; @@ -1717,6 +1721,7 @@ compatible = "nvidia,tegra194-carmel"; device_type = "cpu"; reg = <0x201>; + status = "disabled"; enable-method = "psci"; i-cache-size = <131072>; i-cache-line-size = <64>; @@ -1731,6 +1736,7 @@ compatible = "nvidia,tegra194-carmel"; device_type = "cpu"; reg = <0x300>; + status = "disabled"; enable-method = "psci"; i-cache-size = <131072>; i-cache-line-size = <64>; @@ -1745,6 +1751,7 @@ compatible = "nvidia,tegra194-carmel"; device_type = "cpu"; reg = <0x301>; + status = "disabled"; enable-method = "psci"; i-cache-size = <131072>; i-cache-line-size = <64>;