From: Krishna Chaitanya Chundru <quic_krichai@quicinc.com>
To: Konrad Dybcio <konrad.dybcio@linaro.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Vinod Koul <vkoul@kernel.org>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: <linux-arm-msm@vger.kernel.org>, <linux-phy@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<quic_vbadigan@quicinc.com>, <quic_ramkri@quicinc.com>,
<quic_nitegupt@quicinc.com>, <quic_skananth@quicinc.com>,
<quic_vpernami@quicinc.com>, <quic_parass@quicinc.com>
Subject: Re: [PATCH v2 0/3] phy: qcom-qmp-pcie: Add support to keep refclk always on
Date: Thu, 9 Nov 2023 15:02:01 +0530 [thread overview]
Message-ID: <65d2bba9-b04c-f91b-100a-ffb07e9b615a@quicinc.com> (raw)
In-Reply-To: <8a12ccba-908d-405a-8fcb-411d50a66ebe@linaro.org>
On 11/8/2023 3:27 AM, Konrad Dybcio wrote:
>
>
> On 11/7/23 13:26, Krishna chaitanya chundru wrote:
>> This series adds support to provide refclk to endpoint even in low
>> power states.
>>
>> Due to some platform specific issues with CLKREQ signal, it is not being
>> propagated to the host and as host doesn't know the clkreq signal
>> host is
>> not sending refclk. Due to this endpoint is seeing linkdown and going
>> to bad state.
>> To avoid those ref clk should be provided always to the endpoint. The
>> issue is coming only when ep intiates the L1.1 or L1.2 exit and clkreq
>> is not being propagated properly to the host.
> I'm gonna sound like a broken record, but:
>
> How much power does this consume? Would it matter if we kept this
> clock always-on for all platforms with this version of the phy?
>
> Konrad
We see about 22mw extra power consumption with refclk always on.
We can't keep this property always on as there is impact on power
consumption.
- Krishna Chaitanya
--
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next prev parent reply other threads:[~2023-11-09 9:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-07 12:26 [PATCH v2 0/3] phy: qcom-qmp-pcie: Add support to keep refclk always on Krishna chaitanya chundru
2023-11-07 12:26 ` [PATCH v2 1/3] dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property Krishna chaitanya chundru
2023-11-07 13:01 ` Dmitry Baryshkov
2023-11-08 15:52 ` Conor Dooley
2023-11-27 11:49 ` Krishna Chaitanya Chundru
2023-11-07 12:26 ` [PATCH v2 2/3] phy: qcom-qmp-pcie: Add endpoint refclk control register offset Krishna chaitanya chundru
2023-11-07 13:06 ` Dmitry Baryshkov
2023-11-09 9:36 ` Krishna Chaitanya Chundru
2023-11-09 9:45 ` Dmitry Baryshkov
2023-11-09 10:02 ` Krishna Chaitanya Chundru
2023-11-07 12:26 ` [PATCH v2 3/3] phy: qcom-qmp-pcie: Add support for keeping refclk always on Krishna chaitanya chundru
2023-11-07 13:08 ` Dmitry Baryshkov
2023-11-07 21:57 ` [PATCH v2 0/3] phy: qcom-qmp-pcie: Add support to keep " Konrad Dybcio
2023-11-09 9:32 ` Krishna Chaitanya Chundru [this message]
2023-11-09 13:57 ` Konrad Dybcio
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