linux-kernel - Re: [RESEND RFC PATCH 2/2] ARM: dts: rockchip: Update the cpu freqs table

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Message-ID: <4951150.PYM4FhWu6V@phil>
Date:	Fri, 08 Jan 2016 20:16:19 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	Xing Zheng <zhengxing@...k-chips.com>
Cc:	linux-rockchip@...ts.infradead.org, keescook@...gle.com,
	leozwang@...gle.com, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND RFC PATCH 2/2] ARM: dts: rockchip: Update the cpu freqs table

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@...k-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@...V just fine as well.

I guess you should find out which voltages are really necessary for each 
step.


Heiko