Path: csiph.com!au2pb.net!feeder.erje.net!2.us.feeder.erje.net!newsfeed.fsmpi.rwth-aachen.de!newsfeed.straub-nv.de!news.mixmin.net!aioe.org!bofh.it!news.nic.it!robomod From: Xing Zheng Newsgroups: linux.kernel Subject: Re: [RESEND RFC PATCH 2/2] ARM: dts: rockchip: Update the cpu freqs table Date: Sat, 09 Jan 2016 04:10:02 +0100 Message-ID: References: X-Original-To: Heiko Stuebner X-263anti-Spam: KSV:0;BIG:0;ABS:1;DNS:0;ATT:0;SPF:S; X-Mail-Delivery: 1 X-Abs-Checked: 1 X-Ske-Checked: 1 X-Rl-Sender: zhengxing@rock-chips.com X-Fst-To: linux-kernel@vger.kernel.org X-Sender-IP: 58.22.7.114 X-Login-Name: zhengxing@rock-chips.com X-Unique-Tag: X-Sender: zhengxing@rock-chips.com User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 62 Organization: linux.* mail to news gateway X-Original-Cc: linux-rockchip@lists.infradead.org, keescook@google.com, leozwang@google.com, Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Russell King , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org X-Original-Date: Sat, 9 Jan 2016 11:04:36 +0800 X-Original-Message-ID: <569078C4.8080000@rock-chips.com> X-Original-References: <1452252698-16765-1-git-send-email-zhengxing@rock-chips.com> <1452252698-16765-3-git-send-email-zhengxing@rock-chips.com> <4951150.PYM4FhWu6V@phil> X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: csiph.com linux.kernel:1305153 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 >> --- >> >> 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 > 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