linux-kernel - Re: [PATCH] arm64: dts: rockchip: Add idle-states to device tree for rk3399

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Date:   Mon, 13 Aug 2018 16:59:24 +0800
From:   Tao Huang <huangtao@...k-chips.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     Caesar Wang <wxt@...k-chips.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Xing Zheng <zhengxing@...k-chips.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Catalin Marinas <catalin.marinas@....com>,
        dbasehore@...omium.org, Will Deacon <will.deacon@....com>,
        dianders@...omium.org, Rob Herring <robh+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        tony.xie@...k-chips.com, David Wu <david.wu@...k-chips.com>,
        cf@...k-chips.com, Jianqun Xu <jay.xu@...k-chips.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: dts: rockchip: Add idle-states to device tree for
 rk3399

On 2018年08月13日 16:25, Heiko Stuebner wrote:
> Hi Tao,
>
> Am Sonntag, 12. August 2018, 18:24:45 CEST schrieb Tao Huang:
>> On 2018年08月10日 04:09, Heiko Stuebner wrote:
>>> Am Mittwoch, 6. Juli 2016, 10:20:54 CEST schrieb Caesar Wang:
>>>
>>>>  arch/arm64/boot/dts/rockchip/rk3399.dtsi | 18 ++++++++++++++++++
>>>>  1 file changed, 18 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
>>>> index a6dd623..12ce265 100644
>>>> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
>>>> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
>>>> @@ -101,6 +101,18 @@
>>>>  			};
>>>>  		};
>>>>  
>>>> +		idle-states {
>>>> +			entry-method = "psci";
>>>> +			cpu_sleep: cpu-sleep-0 {
>>>> +				compatible = "arm,idle-state";
>>>> +				local-timer-stop;
>>>> +				arm,psci-suspend-param = <0x0010000>;
>>>> +				entry-latency-us = <350>;
>>>> +				exit-latency-us = <600>;
>>>> +				min-residency-us = <1150>;
>>> Looking at the chromeos kernel, there are some more patches adapting
>>> this idle-state to use different timings.
>> Yes, we have another values. So the values of this patch are wrong.
>>> There also was a cluster-idle state added for a while but that seems to
>>> cause audio issues according to the CrOS history.
>> DMA or Audio driver should add PM_QOS_CPU_DMA_LATENCY or other methods to avoid the effects of idle.
>> Idle itself is good.
> Thanks for the clarification. Do you know if some from Rockchip plans
> on submitting a new version of the patch with changed timings and
> cluster-sleep?

Okay. I will arrange engineer to submit the patch.