From: Heiko Stuebner <heiko@sntech.de>
To: Xing Zheng <zhengxing@rock-chips.com>
Cc: linux-rockchip@lists.infradead.org, keescook@google.com,
leozwang@google.com, Rob Herring <robh+dt@kernel.org>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Russell King <linux@arm.linux.org.uk>,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RESEND RFC PATCH 2/2] ARM: dts: rockchip: Update the cpu freqs table
Date: Fri, 08 Jan 2016 20:16:19 +0100 [thread overview]
Message-ID: <4951150.PYM4FhWu6V@phil> (raw)
In-Reply-To: <1452252698-16765-3-git-send-email-zhengxing@rock-chips.com>
Hi Xing,
Am Freitag, 8. Januar 2016, 19:31:38 schrieb Xing Zheng:
> Actually, we need more cpu freqs which are 50MHz integer multiples.
>
> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
> ---
>
> arch/arm/boot/dts/rk3036.dtsi | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/rk3036.dtsi b/arch/arm/boot/dts/rk3036.dtsi
> index 1cb5877..1a773eb 100644
> --- a/arch/arm/boot/dts/rk3036.dtsi
> +++ b/arch/arm/boot/dts/rk3036.dtsi
> @@ -79,7 +79,18 @@
> resets = <&cru SRST_CORE0>;
> operating-points = <
> /* KHz uV */
> - 816000 1000000
> + 1200000 1200000
> + 1100000 1200000
> + 1000000 1200000
> + 900000 1200000
> + 800000 1200000
> + 700000 1200000
> + 600000 1200000
> + 500000 1200000
> + 400000 1200000
> + 300000 1200000
> + 200000 1200000
> + 100000 1200000
what about reducing the voltage as well?
From rk3288-specific discussions I remember that reducing the frequency
without touching the voltage, didn't really save so much energy.
And it looks like it was running 816MHz@1.0V just fine as well.
I guess you should find out which voltages are really necessary for each
step.
Heiko
WARNING: multiple messages have this Message-ID (diff)
From: heiko@sntech.de (Heiko Stuebner)
To: linux-arm-kernel@lists.infradead.org
Subject: [RESEND RFC PATCH 2/2] ARM: dts: rockchip: Update the cpu freqs table
Date: Fri, 08 Jan 2016 20:16:19 +0100 [thread overview]
Message-ID: <4951150.PYM4FhWu6V@phil> (raw)
In-Reply-To: <1452252698-16765-3-git-send-email-zhengxing@rock-chips.com>
Hi Xing,
Am Freitag, 8. Januar 2016, 19:31:38 schrieb Xing Zheng:
> Actually, we need more cpu freqs which are 50MHz integer multiples.
>
> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
> ---
>
> arch/arm/boot/dts/rk3036.dtsi | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/rk3036.dtsi b/arch/arm/boot/dts/rk3036.dtsi
> index 1cb5877..1a773eb 100644
> --- a/arch/arm/boot/dts/rk3036.dtsi
> +++ b/arch/arm/boot/dts/rk3036.dtsi
> @@ -79,7 +79,18 @@
> resets = <&cru SRST_CORE0>;
> operating-points = <
> /* KHz uV */
> - 816000 1000000
> + 1200000 1200000
> + 1100000 1200000
> + 1000000 1200000
> + 900000 1200000
> + 800000 1200000
> + 700000 1200000
> + 600000 1200000
> + 500000 1200000
> + 400000 1200000
> + 300000 1200000
> + 200000 1200000
> + 100000 1200000
what about reducing the voltage as well?
>From rk3288-specific discussions I remember that reducing the frequency
without touching the voltage, didn't really save so much energy.
And it looks like it was running 816MHz at 1.0V just fine as well.
I guess you should find out which voltages are really necessary for each
step.
Heiko
WARNING: multiple messages have this Message-ID (diff)
From: Heiko Stuebner <heiko@sntech.de>
To: Xing Zheng <zhengxing@rock-chips.com>
Cc: linux-rockchip@lists.infradead.org, keescook@google.com,
leozwang@google.com, Rob Herring <robh+dt@kernel.org>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Russell King <linux@arm.linux.org.uk>,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RESEND RFC PATCH 2/2] ARM: dts: rockchip: Update the cpu freqs table
Date: Fri, 08 Jan 2016 20:16:19 +0100 [thread overview]
Message-ID: <4951150.PYM4FhWu6V@phil> (raw)
In-Reply-To: <1452252698-16765-3-git-send-email-zhengxing@rock-chips.com>
Hi Xing,
Am Freitag, 8. Januar 2016, 19:31:38 schrieb Xing Zheng:
> Actually, we need more cpu freqs which are 50MHz integer multiples.
>
> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
> ---
>
> arch/arm/boot/dts/rk3036.dtsi | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/rk3036.dtsi b/arch/arm/boot/dts/rk3036.dtsi
> index 1cb5877..1a773eb 100644
> --- a/arch/arm/boot/dts/rk3036.dtsi
> +++ b/arch/arm/boot/dts/rk3036.dtsi
> @@ -79,7 +79,18 @@
> resets = <&cru SRST_CORE0>;
> operating-points = <
> /* KHz uV */
> - 816000 1000000
> + 1200000 1200000
> + 1100000 1200000
> + 1000000 1200000
> + 900000 1200000
> + 800000 1200000
> + 700000 1200000
> + 600000 1200000
> + 500000 1200000
> + 400000 1200000
> + 300000 1200000
> + 200000 1200000
> + 100000 1200000
what about reducing the voltage as well?
>From rk3288-specific discussions I remember that reducing the frequency
without touching the voltage, didn't really save so much energy.
And it looks like it was running 816MHz@1.0V just fine as well.
I guess you should find out which voltages are really necessary for each
step.
Heiko
next prev parent reply other threads:[~2016-01-08 19:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-08 11:31 [RESEND RFC PATCH 0/2] Add 100MHz integer multiples of cpu freq table for the RK3036 Xing Zheng
2016-01-08 11:31 ` Xing Zheng
2016-01-08 11:31 ` Xing Zheng
2016-01-08 11:31 ` [RESEND RFC PATCH 1/2] clk: rockchip: rk3036: Add to 100MHz integer multiples of cpu freq table Xing Zheng
2016-01-08 11:31 ` Xing Zheng
2016-01-08 11:31 ` [RESEND RFC PATCH 2/2] ARM: dts: rockchip: Update the cpu freqs table Xing Zheng
2016-01-08 11:31 ` Xing Zheng
2016-01-08 19:16 ` Heiko Stuebner [this message]
2016-01-08 19:16 ` Heiko Stuebner
2016-01-08 19:16 ` Heiko Stuebner
2016-01-09 3:04 ` Xing Zheng
2016-01-09 3:04 ` Xing Zheng
2016-01-09 3:04 ` Xing Zheng
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