| Message ID | 20170830144120.9312-4-dietmar.eggemann@arm.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
On Wed, Aug 30, 2017 at 03:41:19PM +0100, Dietmar Eggemann wrote: > The following 'capacity-dmips-mhz' dt property values are used: > > Cortex-A15: 1024, Cortex-A7: 539 > > They have been derived form the cpu_efficiency values: > > Cortex-A15: 3891, Cortex-A7: 2048 > > by scaling them so that the Cortex-A15s (big cores) use 1024. > > The cpu_efficiency values were originally derived from the "Big.LITTLE > Processing with ARM Cortex™-A15 & Cortex-A7" white paper > (http://www.cl.cam.ac.uk/~rdm34/big.LITTLE.pdf). Table 1 lists 1.9x > (3891/2048) as the Cortex-A15 vs Cortex-A7 performance ratio for the > Dhrystone benchmark. > > The following platforms are affected once cpu-invariant accounting > support is re-connected to the task scheduler: > > odroidxu3, odroidxu3-lite, odroidxu4 > > Cc: Rob Herring <robh+dt@kernel.org> > Cc: Mark Rutland <mark.rutland@arm.com> > Cc: Russell King <linux@armlinux.org.uk> > Cc: Kukjin Kim <kgene@kernel.org> > Cc: Krzysztof Kozlowski <krzk@kernel.org> > Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> > --- > arch/arm/boot/dts/exynos5422-cpus.dtsi | 8 ++++++++ > 1 file changed, 8 insertions(+) > Thanks, applied. Best regards, Krzysztof -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm/boot/dts/exynos5422-cpus.dtsi b/arch/arm/boot/dts/exynos5422-cpus.dtsi index bf3c6f1ec4ee..ec01d8020c2d 100644 --- a/arch/arm/boot/dts/exynos5422-cpus.dtsi +++ b/arch/arm/boot/dts/exynos5422-cpus.dtsi @@ -35,6 +35,7 @@ cooling-min-level = <0>; cooling-max-level = <11>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <539>; }; cpu1: cpu@101 { @@ -47,6 +48,7 @@ cooling-min-level = <0>; cooling-max-level = <11>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <539>; }; cpu2: cpu@102 { @@ -59,6 +61,7 @@ cooling-min-level = <0>; cooling-max-level = <11>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <539>; }; cpu3: cpu@103 { @@ -71,6 +74,7 @@ cooling-min-level = <0>; cooling-max-level = <11>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <539>; }; cpu4: cpu@0 { @@ -84,6 +88,7 @@ cooling-min-level = <0>; cooling-max-level = <15>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <1024>; }; cpu5: cpu@1 { @@ -96,6 +101,7 @@ cooling-min-level = <0>; cooling-max-level = <15>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <1024>; }; cpu6: cpu@2 { @@ -108,6 +114,7 @@ cooling-min-level = <0>; cooling-max-level = <15>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <1024>; }; cpu7: cpu@3 { @@ -120,6 +127,7 @@ cooling-min-level = <0>; cooling-max-level = <15>; #cooling-cells = <2>; /* min followed by max */ + capacity-dmips-mhz = <1024>; }; }; };
The following 'capacity-dmips-mhz' dt property values are used: Cortex-A15: 1024, Cortex-A7: 539 They have been derived form the cpu_efficiency values: Cortex-A15: 3891, Cortex-A7: 2048 by scaling them so that the Cortex-A15s (big cores) use 1024. The cpu_efficiency values were originally derived from the "Big.LITTLE Processing with ARM Cortex™-A15 & Cortex-A7" white paper (http://www.cl.cam.ac.uk/~rdm34/big.LITTLE.pdf). Table 1 lists 1.9x (3891/2048) as the Cortex-A15 vs Cortex-A7 performance ratio for the Dhrystone benchmark. The following platforms are affected once cpu-invariant accounting support is re-connected to the task scheduler: odroidxu3, odroidxu3-lite, odroidxu4 Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> --- arch/arm/boot/dts/exynos5422-cpus.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+)