Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH] arm64: dts: rockchip: Add idle-states to device tree for
 rk3399
To:     Heiko Stuebner <heiko@sntech.de>
Cc:     Caesar Wang <wxt@rock-chips.com>,
        Mark Rutland <mark.rutland@arm.com>,
        devicetree@vger.kernel.org,
        Brian Norris <briannorris@chromium.org>,
        Xing Zheng <zhengxing@rock-chips.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        dbasehore@chromium.org, Will Deacon <will.deacon@arm.com>,
        dianders@chromium.org, Rob Herring <robh+dt@kernel.org>,
        linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
        tony.xie@rock-chips.com, David Wu <david.wu@rock-chips.com>,
        cf@rock-chips.com, Jianqun Xu <jay.xu@rock-chips.com>,
        linux-arm-kernel@lists.infradead.org
References: <1467793254-10808-1-git-send-email-wxt@rock-chips.com>
 <5620784.b19SH5PkdR@phil>
 <ae312dc3-f640-ecf3-049a-c8576bb83330@rock-chips.com>
 <3578407.YVa0lydFsh@phil>
From:   Tao Huang <huangtao@rock-chips.com>
Message-ID: <fe65548d-3c98-968c-c9e1-c90dfad12502@rock-chips.com>
Date:   Mon, 13 Aug 2018 16:59:24 +0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.9.1
MIME-Version: 1.0
In-Reply-To: <3578407.YVa0lydFsh@phil>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Content-Language: en-US
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.