| Message ID | 20240507065319.274976-3-xingyu.wu@starfivetech.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Add notifier for PLL0 clock and set it 1.5GHz on | expand |
Xingyu Wu wrote: > CPUfreq supports 4 cpu frequency loads on 375/500/750/1500MHz. > But now PLL0 rate is 1GHz and the cpu frequency loads become > 333/500/500/1000MHz in fact. > > The PLL0 rate should be default set to 1.5GHz and set the > cpu_core rate to 500MHz in safe. > > Fixes: e2c510d6d630 ("riscv: dts: starfive: Add cpu scaling for JH7110 SoC") > Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com> This should really be based on Conor's riscv-dt-for-next branch, eg. the change should be to the new jh7110-common.dtsi instead since the Milk-V Mars board would most likely also benefit from this change. In any case: Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com> > --- > .../boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > index 45b58b6f3df8..28981b267de4 100644 > --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > @@ -390,6 +390,12 @@ spi_dev0: spi@0 { > }; > }; > > +&syscrg { > + assigned-clocks = <&syscrg JH7110_SYSCLK_CPU_CORE>, > + <&pllclk JH7110_PLLCLK_PLL0_OUT>; > + assigned-clock-rates = <500000000>, <1500000000>; > +}; > + > &sysgpio { > i2c0_pins: i2c0-0 { > i2c-pins { > -- > 2.25.1 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
On 2024-05-07 1:53 AM, Xingyu Wu wrote: > CPUfreq supports 4 cpu frequency loads on 375/500/750/1500MHz. > But now PLL0 rate is 1GHz and the cpu frequency loads become > 333/500/500/1000MHz in fact. > > The PLL0 rate should be default set to 1.5GHz and set the > cpu_core rate to 500MHz in safe. Can this be accomplished by instead setting the CLK_SET_RATE_PARENT flag on the CPU_CORE clock? That way PLL0 is automatically set when cpufreq tries to change the CPU core frequency. Then there is no DT change and no compatibility issue. Regards, Samuel > Fixes: e2c510d6d630 ("riscv: dts: starfive: Add cpu scaling for JH7110 SoC") > Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com> > --- > .../boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > index 45b58b6f3df8..28981b267de4 100644 > --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > @@ -390,6 +390,12 @@ spi_dev0: spi@0 { > }; > }; > > +&syscrg { > + assigned-clocks = <&syscrg JH7110_SYSCLK_CPU_CORE>, > + <&pllclk JH7110_PLLCLK_PLL0_OUT>; > + assigned-clock-rates = <500000000>, <1500000000>; > +}; > + > &sysgpio { > i2c0_pins: i2c0-0 { > i2c-pins {
On 12/05/2024 02:47, Samuel Holland wrote: > > On 2024-05-07 1:53 AM, Xingyu Wu wrote: > > CPUfreq supports 4 cpu frequency loads on 375/500/750/1500MHz. > > But now PLL0 rate is 1GHz and the cpu frequency loads become > > 333/500/500/1000MHz in fact. > > > > The PLL0 rate should be default set to 1.5GHz and set the cpu_core > > rate to 500MHz in safe. > > Can this be accomplished by instead setting the CLK_SET_RATE_PARENT flag on > the CPU_CORE clock? That way PLL0 is automatically set when cpufreq tries to > change the CPU core frequency. Then there is no DT change and no compatibility > issue. > > Regards, > Samuel Thanks for your advice. But cpufreq tries to change the CPU core rate and also the PLL0 rate with the flag of CLK_SET_RATE_PARENT and the PLL0 will be changed frequently. I think it goes against our intention and the PLL0 rate should be fixed or rarely changed. This helps to stabilize the system. Best regards, Xingyu Wu > > > Fixes: e2c510d6d630 ("riscv: dts: starfive: Add cpu scaling for JH7110 > > SoC") > > Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com> > > --- > > .../boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > > diff --git > > a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > > b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > > index 45b58b6f3df8..28981b267de4 100644 > > --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > > +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi > > @@ -390,6 +390,12 @@ spi_dev0: spi@0 { > > }; > > }; > > > > +&syscrg { > > + assigned-clocks = <&syscrg JH7110_SYSCLK_CPU_CORE>, > > + <&pllclk JH7110_PLLCLK_PLL0_OUT>; > > + assigned-clock-rates = <500000000>, <1500000000>; }; > > + > > &sysgpio { > > i2c0_pins: i2c0-0 { > > i2c-pins {
diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi index 45b58b6f3df8..28981b267de4 100644 --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi @@ -390,6 +390,12 @@ spi_dev0: spi@0 { }; }; +&syscrg { + assigned-clocks = <&syscrg JH7110_SYSCLK_CPU_CORE>, + <&pllclk JH7110_PLLCLK_PLL0_OUT>; + assigned-clock-rates = <500000000>, <1500000000>; +}; + &sysgpio { i2c0_pins: i2c0-0 { i2c-pins {
CPUfreq supports 4 cpu frequency loads on 375/500/750/1500MHz. But now PLL0 rate is 1GHz and the cpu frequency loads become 333/500/500/1000MHz in fact. The PLL0 rate should be default set to 1.5GHz and set the cpu_core rate to 500MHz in safe. Fixes: e2c510d6d630 ("riscv: dts: starfive: Add cpu scaling for JH7110 SoC") Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com> --- .../boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi | 6 ++++++ 1 file changed, 6 insertions(+)