| Message ID | 346cd9f0-583d-f467-83d0-e73768bf5aac@free.fr (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v3] arm64: dts: qcom: msm8998: Add PSCI cpuidle low power states | expand |
On Thu, May 23, 2019 at 10:36:51AM +0200, Marc Gonzalez wrote: > From: Amit Kucheria <amit.kucheria@linaro.org> > > Add device bindings for cpuidle states for cpu devices. > > [marc: rebase and fix arm,psci-suspend-param for power-collapse] > Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> > Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org> > Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr> > --- > Bjorn, this is an updated/fixed (as documented above) version of > [PATCH v2 7/9] arm64: dts: qcom: msm8998: Add PSCI cpuidle low power states > --- > arch/arm64/boot/dts/qcom/msm8998.dtsi | 50 +++++++++++++++++++++++++++ > 1 file changed, 50 insertions(+) > > diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi > index 412195b9794c..224f84e39204 100644 > --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi > +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi > @@ -78,6 +78,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x0>; > enable-method = "psci"; > + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; > next-level-cache = <&L2_0>; > L2_0: l2-cache { > compatible = "arm,arch-cache"; > @@ -96,6 +97,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x1>; > enable-method = "psci"; > + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; > next-level-cache = <&L2_0>; > L1_I_1: l1-icache { > compatible = "arm,arch-cache"; > @@ -110,6 +112,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x2>; > enable-method = "psci"; > + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; > next-level-cache = <&L2_0>; > L1_I_2: l1-icache { > compatible = "arm,arch-cache"; > @@ -124,6 +127,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x3>; > enable-method = "psci"; > + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; > next-level-cache = <&L2_0>; > L1_I_3: l1-icache { > compatible = "arm,arch-cache"; > @@ -138,6 +142,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x100>; > enable-method = "psci"; > + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; > next-level-cache = <&L2_1>; > L2_1: l2-cache { > compatible = "arm,arch-cache"; > @@ -156,6 +161,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x101>; > enable-method = "psci"; > + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; > next-level-cache = <&L2_1>; > L1_I_101: l1-icache { > compatible = "arm,arch-cache"; > @@ -170,6 +176,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x102>; > enable-method = "psci"; > + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; > next-level-cache = <&L2_1>; > L1_I_102: l1-icache { > compatible = "arm,arch-cache"; > @@ -184,6 +191,7 @@ > compatible = "arm,armv8"; > reg = <0x0 0x103>; > enable-method = "psci"; > + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; > next-level-cache = <&L2_1>; > L1_I_103: l1-icache { > compatible = "arm,arch-cache"; > @@ -230,6 +238,48 @@ > }; > }; > }; > + Hello Marc, Amit, Looking at this line of code in msm-4.14: https://source.codeaurora.org/quic/la/kernel/msm-4.14/tree/drivers/cpuidle/lpm-levels.c?h=LA.UM.7.1.r1-14000-sm8150.0#n993 And seeing the equivalent in msm-4.4: https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/drivers/cpuidle/lpm-levels.c?h=msm-4.4#n1080 It becomes obvious that qcom,time-overhead == entry-latency-us + exit-latency-us and qcom,latency-us == exit-latency-us which means that entry-latency-us == qcom,time-overhead - qcom,latency-us Using this formula, with the numbers from downstream SDM845: https://source.codeaurora.org/quic/la/kernel/msm-4.9/tree/arch/arm64/boot/dts/qcom/sdm845-pm.dtsi?h=msm-4.9#n123 qcom,latency-us = <621>; qcom,time-overhead = <885>; 885 - 621 = 264 we end up with the same values that Raju has in his submission for upstream SDM845: https://patchwork.kernel.org/patch/10953253/ entry-latency-us = <264>; exit-latency-us = <621>; > + idle-states { > + entry-method = "psci"; > + > + LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 { > + compatible = "arm,idle-state"; > + idle-state-name = "little-retention"; > + arm,psci-suspend-param = <0x00000002>; > + entry-latency-us = <43>; > + exit-latency-us = <86>; Which for little cluster retention: https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n153 qcom,latency-us = <86>; qcom,time-overhead = <167>; gives: entry-latency-us = <81>; exit-latency-us = <86>; > + min-residency-us = <200>; > + }; > + > + LITTLE_CPU_SLEEP_1: cpu-sleep-0-1 { > + compatible = "arm,idle-state"; > + idle-state-name = "little-power-collapse"; > + arm,psci-suspend-param = <0x40000003>; > + entry-latency-us = <100>; > + exit-latency-us = <612>; Which for little power collapse: https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n163 qcom,latency-us = <612>; qcom,time-overhead = <885>; gives: entry-latency-us = <273>; exit-latency-us = <612>; > + min-residency-us = <1000>; > + local-timer-stop; > + }; > + > + BIG_CPU_SLEEP_0: cpu-sleep-1-0 { > + compatible = "arm,idle-state"; > + idle-state-name = "big-retention"; > + arm,psci-suspend-param = <0x00000002>; > + entry-latency-us = <41>; > + exit-latency-us = <82>; Which for big retention: https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n246 qcom,latency-us = <82>; qcom,time-overhead = <161>; gives: entry-latency-us = <79>; exit-latency-us = <82>; > + min-residency-us = <200>; > + }; > + > + BIG_CPU_SLEEP_1: cpu-sleep-1-1 { > + compatible = "arm,idle-state"; > + idle-state-name = "big-power-collapse"; > + arm,psci-suspend-param = <0x40000003>; > + entry-latency-us = <100>; > + exit-latency-us = <525>; > + min-residency-us = <1000>; Which for big power collapse: https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n256 qcom,latency-us = <525>; qcom,time-overhead = <861>; gives: entry-latency-us = <336>; exit-latency-us = <525>; > + local-timer-stop; > + }; > + }; > }; > > firmware { > -- > 2.17.1
On 23/05/2019 23:46, Niklas Cassel wrote: > On Thu, May 23, 2019 at 10:36:51AM +0200, Marc Gonzalez wrote: > >> From: Amit Kucheria <amit.kucheria@linaro.org> >> >> Add device bindings for cpuidle states for cpu devices. >> >> [marc: rebase and fix arm,psci-suspend-param for power-collapse] >> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> >> Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org> >> Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr> >> --- >> Bjorn, this is an updated/fixed (as documented above) version of >> [PATCH v2 7/9] arm64: dts: qcom: msm8998: Add PSCI cpuidle low power states >> --- >> arch/arm64/boot/dts/qcom/msm8998.dtsi | 50 +++++++++++++++++++++++++++ >> 1 file changed, 50 insertions(+) >> >> diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi >> index 412195b9794c..224f84e39204 100644 >> --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi >> +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi >> @@ -78,6 +78,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x0>; >> enable-method = "psci"; >> + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; >> next-level-cache = <&L2_0>; >> L2_0: l2-cache { >> compatible = "arm,arch-cache"; >> @@ -96,6 +97,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x1>; >> enable-method = "psci"; >> + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; >> next-level-cache = <&L2_0>; >> L1_I_1: l1-icache { >> compatible = "arm,arch-cache"; >> @@ -110,6 +112,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x2>; >> enable-method = "psci"; >> + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; >> next-level-cache = <&L2_0>; >> L1_I_2: l1-icache { >> compatible = "arm,arch-cache"; >> @@ -124,6 +127,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x3>; >> enable-method = "psci"; >> + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; >> next-level-cache = <&L2_0>; >> L1_I_3: l1-icache { >> compatible = "arm,arch-cache"; >> @@ -138,6 +142,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x100>; >> enable-method = "psci"; >> + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; >> next-level-cache = <&L2_1>; >> L2_1: l2-cache { >> compatible = "arm,arch-cache"; >> @@ -156,6 +161,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x101>; >> enable-method = "psci"; >> + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; >> next-level-cache = <&L2_1>; >> L1_I_101: l1-icache { >> compatible = "arm,arch-cache"; >> @@ -170,6 +176,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x102>; >> enable-method = "psci"; >> + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; >> next-level-cache = <&L2_1>; >> L1_I_102: l1-icache { >> compatible = "arm,arch-cache"; >> @@ -184,6 +191,7 @@ >> compatible = "arm,armv8"; >> reg = <0x0 0x103>; >> enable-method = "psci"; >> + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; >> next-level-cache = <&L2_1>; >> L1_I_103: l1-icache { >> compatible = "arm,arch-cache"; >> @@ -230,6 +238,48 @@ >> }; >> }; >> }; >> + > > Hello Marc, Amit, > > Looking at this line of code in msm-4.14: > https://source.codeaurora.org/quic/la/kernel/msm-4.14/tree/drivers/cpuidle/lpm-levels.c?h=LA.UM.7.1.r1-14000-sm8150.0#n993 > > And seeing the equivalent in msm-4.4: > https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/drivers/cpuidle/lpm-levels.c?h=msm-4.4#n1080 > > It becomes obvious that > > qcom,time-overhead == entry-latency-us + exit-latency-us > and > qcom,latency-us == exit-latency-us > > which means that > > entry-latency-us == qcom,time-overhead - qcom,latency-us > > > Using this formula, with the numbers from downstream SDM845: > https://source.codeaurora.org/quic/la/kernel/msm-4.9/tree/arch/arm64/boot/dts/qcom/sdm845-pm.dtsi?h=msm-4.9#n123 > > qcom,latency-us = <621>; > qcom,time-overhead = <885>; > > 885 - 621 = 264 > > we end up with the same values that Raju > has in his submission for upstream SDM845: > https://patchwork.kernel.org/patch/10953253/ > > entry-latency-us = <264>; > exit-latency-us = <621>; > >> + idle-states { >> + entry-method = "psci"; >> + >> + LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 { >> + compatible = "arm,idle-state"; >> + idle-state-name = "little-retention"; >> + arm,psci-suspend-param = <0x00000002>; >> + entry-latency-us = <43>; >> + exit-latency-us = <86>; > > Which for little cluster retention: > > https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n153 > > qcom,latency-us = <86>; > qcom,time-overhead = <167>; > > gives: > > entry-latency-us = <81>; > exit-latency-us = <86>; > >> + min-residency-us = <200>; >> + }; >> + >> + LITTLE_CPU_SLEEP_1: cpu-sleep-0-1 { >> + compatible = "arm,idle-state"; >> + idle-state-name = "little-power-collapse"; >> + arm,psci-suspend-param = <0x40000003>; >> + entry-latency-us = <100>; >> + exit-latency-us = <612>; > > Which for little power collapse: > > https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n163 > > qcom,latency-us = <612>; > qcom,time-overhead = <885>; > > gives: > > entry-latency-us = <273>; > exit-latency-us = <612>; > >> + min-residency-us = <1000>; >> + local-timer-stop; >> + }; >> + >> + BIG_CPU_SLEEP_0: cpu-sleep-1-0 { >> + compatible = "arm,idle-state"; >> + idle-state-name = "big-retention"; >> + arm,psci-suspend-param = <0x00000002>; >> + entry-latency-us = <41>; >> + exit-latency-us = <82>; > > Which for big retention: > > https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n246 > > qcom,latency-us = <82>; > qcom,time-overhead = <161>; > > gives: > > entry-latency-us = <79>; > exit-latency-us = <82>; > >> + min-residency-us = <200>; >> + }; >> + >> + BIG_CPU_SLEEP_1: cpu-sleep-1-1 { >> + compatible = "arm,idle-state"; >> + idle-state-name = "big-power-collapse"; >> + arm,psci-suspend-param = <0x40000003>; >> + entry-latency-us = <100>; >> + exit-latency-us = <525>; >> + min-residency-us = <1000>; > > Which for big power collapse: > > https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/msm8998-pm.dtsi?h=msm-4.4#n256 > > qcom,latency-us = <525>; > qcom,time-overhead = <861>; > > gives: > > entry-latency-us = <336>; > exit-latency-us = <525>; Tangential: I find it somewhat silly to specify the latencies to within a single microsecond. I assume the margin of error is several microseconds? How about rounding to the nearest multiple of 5 microseconds? 81 to 80, 86 to 85, 273 to 275, 612 to 610 79 to 80, 82 to 80 336 to 335 To summarize, all the entry-latency-us were underestimated: diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi index 224f84e39204..ac6bd32c0e7d 100644 --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi @@ -246,7 +246,7 @@ compatible = "arm,idle-state"; idle-state-name = "little-retention"; arm,psci-suspend-param = <0x00000002>; - entry-latency-us = <43>; + entry-latency-us = <81>; exit-latency-us = <86>; min-residency-us = <200>; }; @@ -255,7 +255,7 @@ compatible = "arm,idle-state"; idle-state-name = "little-power-collapse"; arm,psci-suspend-param = <0x40000003>; - entry-latency-us = <100>; + entry-latency-us = <273>; exit-latency-us = <612>; min-residency-us = <1000>; local-timer-stop; @@ -265,7 +265,7 @@ compatible = "arm,idle-state"; idle-state-name = "big-retention"; arm,psci-suspend-param = <0x00000002>; - entry-latency-us = <41>; + entry-latency-us = <79>; exit-latency-us = <82>; min-residency-us = <200>; }; @@ -274,7 +274,7 @@ compatible = "arm,idle-state"; idle-state-name = "big-power-collapse"; arm,psci-suspend-param = <0x40000003>; - entry-latency-us = <100>; + entry-latency-us = <336>; exit-latency-us = <525>; min-residency-us = <1000>; local-timer-stop; Regards.
diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi index 412195b9794c..224f84e39204 100644 --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi @@ -78,6 +78,7 @@ compatible = "arm,armv8"; reg = <0x0 0x0>; enable-method = "psci"; + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; next-level-cache = <&L2_0>; L2_0: l2-cache { compatible = "arm,arch-cache"; @@ -96,6 +97,7 @@ compatible = "arm,armv8"; reg = <0x0 0x1>; enable-method = "psci"; + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; next-level-cache = <&L2_0>; L1_I_1: l1-icache { compatible = "arm,arch-cache"; @@ -110,6 +112,7 @@ compatible = "arm,armv8"; reg = <0x0 0x2>; enable-method = "psci"; + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; next-level-cache = <&L2_0>; L1_I_2: l1-icache { compatible = "arm,arch-cache"; @@ -124,6 +127,7 @@ compatible = "arm,armv8"; reg = <0x0 0x3>; enable-method = "psci"; + cpu-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>; next-level-cache = <&L2_0>; L1_I_3: l1-icache { compatible = "arm,arch-cache"; @@ -138,6 +142,7 @@ compatible = "arm,armv8"; reg = <0x0 0x100>; enable-method = "psci"; + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; next-level-cache = <&L2_1>; L2_1: l2-cache { compatible = "arm,arch-cache"; @@ -156,6 +161,7 @@ compatible = "arm,armv8"; reg = <0x0 0x101>; enable-method = "psci"; + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; next-level-cache = <&L2_1>; L1_I_101: l1-icache { compatible = "arm,arch-cache"; @@ -170,6 +176,7 @@ compatible = "arm,armv8"; reg = <0x0 0x102>; enable-method = "psci"; + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; next-level-cache = <&L2_1>; L1_I_102: l1-icache { compatible = "arm,arch-cache"; @@ -184,6 +191,7 @@ compatible = "arm,armv8"; reg = <0x0 0x103>; enable-method = "psci"; + cpu-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>; next-level-cache = <&L2_1>; L1_I_103: l1-icache { compatible = "arm,arch-cache"; @@ -230,6 +238,48 @@ }; }; }; + + idle-states { + entry-method = "psci"; + + LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 { + compatible = "arm,idle-state"; + idle-state-name = "little-retention"; + arm,psci-suspend-param = <0x00000002>; + entry-latency-us = <43>; + exit-latency-us = <86>; + min-residency-us = <200>; + }; + + LITTLE_CPU_SLEEP_1: cpu-sleep-0-1 { + compatible = "arm,idle-state"; + idle-state-name = "little-power-collapse"; + arm,psci-suspend-param = <0x40000003>; + entry-latency-us = <100>; + exit-latency-us = <612>; + min-residency-us = <1000>; + local-timer-stop; + }; + + BIG_CPU_SLEEP_0: cpu-sleep-1-0 { + compatible = "arm,idle-state"; + idle-state-name = "big-retention"; + arm,psci-suspend-param = <0x00000002>; + entry-latency-us = <41>; + exit-latency-us = <82>; + min-residency-us = <200>; + }; + + BIG_CPU_SLEEP_1: cpu-sleep-1-1 { + compatible = "arm,idle-state"; + idle-state-name = "big-power-collapse"; + arm,psci-suspend-param = <0x40000003>; + entry-latency-us = <100>; + exit-latency-us = <525>; + min-residency-us = <1000>; + local-timer-stop; + }; + }; }; firmware {