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

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Message-ID: <569078C4.8080000@rock-chips.com>
Date:	Sat, 9 Jan 2016 11:04:36 +0800
From:	Xing Zheng <zhengxing@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>
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 Heiko,

On 2016年01月09日 03:16, Heiko Stuebner wrote:
> 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
>
Thank you for your comments. :-)

Yes, these patches currently still in draft stage. Modify the frequency 
of 816MHz is for mac apll patch can be FROMLIST for Kylin Board,
and will work cpu frequency table as a start.

We know you want to set the appropriate frequency of different batches 
of The RK3036 SoCs take some time,so I just tested a fixed
high voltage 1.2v on my evb board, the frequency of the voltage to 
ensure that we can work needed.
We'll start work dynamically adjust the voltage.

Thanks.

- Xing Zheng