From: Neil Armstrong <neil.armstrong@linaro.org>
To: Jens Glathe <jens.glathe@oldschoolsolutions.biz>,
Vinod Koul <vkoul@kernel.org>,
Kishon Vijay Abraham I <kishon@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC 3/3] arm64: dts: qcom: x1e78100-lenovo-thinkpad-t14s: add HDMI nodes
Date: Mon, 8 Sep 2025 14:37:19 +0200 [thread overview]
Message-ID: <7462e29c-7602-45fc-b8f6-31e881ef3fc4@linaro.org> (raw)
In-Reply-To: <a38df652-54c0-4216-9aa5-c8d32599c8f7@oldschoolsolutions.biz>
On 06/09/2025 10:41, Jens Glathe wrote:
> On 21.08.25 15:53, Neil Armstrong wrote:
>> The Thinkpad T14s embeds a transparent 4lanes DP->HDMI transceiver
>> connected to the third QMP Combo PHY 4 lanes.
>>
> [...]
>> .../dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi | 44 ++++++++++++++++++++++
>> 1 file changed, 44 insertions(+)
> [...]
>> diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
>> index 4cf61c2a34e31233b1adc93332bcabef22de3f86..5b62b8c3123633360f249e3ecdc8ea23f44e8e09 100644
>> --- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
> [...]
>> +&mdss_dp2 {
>> + status = "okay";
>> +};
>> +
>> +&mdss_dp2_out {
>> + data-lanes = <0 1 2 3>;
>> +};
>> +
>
> Hi Neil,
>
> shouldn't mdss_dp2_out also have the link-frequencies property?
>
> + link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 8100000000>;
>
> Or is it something the bridge already negotiates?
No, indeed I'll add it, it will fall back to HBR2 anyway (as actually) if the link quality is low.
Neil
>
> with best regards
>
> Jens
>
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next prev parent reply other threads:[~2025-09-08 17:08 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-21 13:53 [PATCH RFC 0/3] phy: qcom: qmp-combo: set default qmpphy_mode from DT for Thinkpad HDMI support Neil Armstrong
2025-08-21 13:53 ` [PATCH RFC 1/3] dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp-phy: Document default phy mode Neil Armstrong
2025-08-22 10:57 ` Dmitry Baryshkov
2025-08-22 11:02 ` Neil Armstrong
2025-08-22 11:39 ` Dmitry Baryshkov
2025-08-23 6:22 ` Xilin Wu
2025-08-23 14:02 ` Dmitry Baryshkov
2025-08-21 13:53 ` [PATCH RFC 2/3] phy: qcom: qmp-combo: get default qmpphy_mode from DT Neil Armstrong
2025-08-21 13:53 ` [PATCH RFC 3/3] arm64: dts: qcom: x1e78100-lenovo-thinkpad-t14s: add HDMI nodes Neil Armstrong
2025-08-22 11:01 ` Dmitry Baryshkov
2025-08-22 11:02 ` Neil Armstrong
2025-08-22 11:40 ` Dmitry Baryshkov
2025-08-22 11:45 ` Stephan Gerhold
2025-08-22 11:57 ` Dmitry Baryshkov
2025-08-22 12:20 ` Stephan Gerhold
2025-09-06 8:41 ` Jens Glathe
2025-09-08 7:16 ` Konrad Dybcio
2025-09-08 7:17 ` Konrad Dybcio
2025-09-08 9:39 ` Dmitry Baryshkov
2025-09-08 11:40 ` Konrad Dybcio
2025-09-08 12:48 ` Dmitry Baryshkov
2025-09-08 12:37 ` Neil Armstrong [this message]
2025-09-06 8:45 ` [PATCH RFC 0/3] phy: qcom: qmp-combo: set default qmpphy_mode from DT for Thinkpad HDMI support Jens Glathe
2025-09-08 13:05 ` Neil Armstrong
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