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Fri, 22 Aug 2025 05:20:16 -0700 (PDT) Date: Fri, 22 Aug 2025 14:20:11 +0200 From: Stephan Gerhold To: Dmitry Baryshkov Cc: Neil Armstrong , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , 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 Message-ID: References: <20250821-topic-x1e80100-hdmi-v1-0-f14ad9430e88@linaro.org> <20250821-topic-x1e80100-hdmi-v1-3-f14ad9430e88@linaro.org> <26j2trl7lypmqzjnw6kwgqz32eqcags34qpgaua7zbwxd4lbgx@n54gemj42xbd> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <26j2trl7lypmqzjnw6kwgqz32eqcags34qpgaua7zbwxd4lbgx@n54gemj42xbd> On Fri, Aug 22, 2025 at 02:57:24PM +0300, Dmitry Baryshkov wrote: > On Fri, Aug 22, 2025 at 01:45:38PM +0200, Stephan Gerhold wrote: > > On Fri, Aug 22, 2025 at 02:01:30PM +0300, Dmitry Baryshkov wrote: > > > On Thu, Aug 21, 2025 at 03:53:28PM +0200, Neil Armstrong wrote: > > > > The Thinkpad T14s embeds a transparent 4lanes DP->HDMI transceiver > > > > connected to the third QMP Combo PHY 4 lanes. > > > > > > > > Add all the data routing, disable mode switching and specify the > > > > QMP Combo PHY should be in DP-Only mode to route the 4 lanes to > > > > the underlying DP phy. > > > > > > > > Signed-off-by: Neil Armstrong > > > > --- > > > > .../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 > > > > @@ -62,6 +62,20 @@ switch-lid { > > > > }; > > > > }; > > > > > > > > + > > > > + hdmi-connector { > > > > + compatible = "hdmi-connector"; > > > > + type = "a"; > > > > + pinctrl-0 = <&hdmi_hpd_default>; > > > > + pinctrl-names = "default"; > > > [...] > > > > + > > > > + port { > > > > + hdmi_con: endpoint { > > > > + remote-endpoint = <&usb_1_ss2_qmpphy_out>; > > > > > > Please describe the transparent bridge too. It can be covered by the > > > simple-bridge.yaml / simple-bridge.c > > > > > > > I think this isn't the case here(?), but how are we going to handle > > devices where we don't know which bridge chip is used? I've seen at > > least 3 or 4 different chips already across all X1E laptops and we don't > > have schematics for most of them. > > Open the case, inspect the board, identify the chip. Everything is as > usual. > The chip might not have any visible identifier. :-) But I guess there is no point theorizing about such potential issues now. We'll see. I agree it would be cleaner to have the bridges modelled. Thanks, Stephan