linux-kernel - [PATCH v2 01/10] arm64: dts: qcom: x1e80100: Add pinctrl template for eDP0 HPD

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Message-Id: <20250822-x1e80100-add-edp-hpd-v2-1-6310176239a6@linaro.org>
Date: Fri, 22 Aug 2025 11:28:52 +0200
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Aleksandrs Vinarskis <alex.vinarskis@...il.com>, 
 Abel Vesa <abel.vesa@...aro.org>, Xilin Wu <wuxilin123@...il.com>, 
 Jens Glathe <jens.glathe@...schoolsolutions.biz>, 
 Srinivas Kandagatla <srini@...nel.org>, 
 Sibi Sankar <quic_sibis@...cinc.com>, 
 Rajendra Nayak <quic_rjendra@...cinc.com>, linux-arm-msm@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Johan Hovold <johan@...nel.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: [PATCH v2 01/10] arm64: dts: qcom: x1e80100: Add pinctrl template
 for eDP0 HPD

At the moment, we indirectly rely on the boot firmware to set up the
pinctrl for the eDP HPD line coming from the internal display. If the boot
firmware does not configure the display (e.g. because a different display
is selected for output in the UEFI settings), then the display fails to
come up and there are several errors in the kernel log:

 [drm:dpu_encoder_phys_vid_wait_for_commit_done:544] [dpu error]vblank timeout: 80020041
 [drm:dpu_kms_wait_for_commit_done:524] [dpu error]wait for commit done returned -110
 [drm:dpu_encoder_frame_done_timeout:2715] [dpu error]enc40 frame done timeout
 ...

Add a new &edp0_hpd_default pinctrl template that can be used by boards to
set up the eDP HPD pin correctly. All boards upstream so far need the same
configuration; if a board needs a different configuration it can just avoid
using this template and define a custom one in the board DT.

Signed-off-by: Stephan Gerhold <stephan.gerhold@...aro.org>
---
 arch/arm64/boot/dts/qcom/x1e80100.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
index f293b13ecc0ce426661187ac793f147d12434fcb..32fa9fa6fb946c4933f74fd0ee820ecb9284901e 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
@@ -5808,6 +5808,12 @@ tlmm: pinctrl@...0000 {
 			gpio-ranges = <&tlmm 0 0 239>;
 			wakeup-parent = <&pdc>;

+			edp0_hpd_default: edp0-hpd-default-state {
+				pins = "gpio119";
+				function = "edp0_hot";
+				bias-disable;
+			};
+
 			qup_i2c0_data_clk: qup-i2c0-data-clk-state {
 				/* SDA, SCL */
 				pins = "gpio0", "gpio1";

-- 
2.50.1