linux-kernel - [PATCH RFT] arm64: dts: qcom: sm8250: Add MDSS

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Message-Id: <20250930-sm8250-mdss-reset-v1-1-a64522d91f12@fairphone.com>
Date: Tue, 30 Sep 2025 09:37:22 +0200
From: Luca Weiss <luca.weiss@...rphone.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH RFT] arm64: dts: qcom: sm8250: Add MDSS_CORE reset to mdss

Like on other platforms, if the OS does not support recovering the state
left by the bootloader it needs access to MDSS_CORE, so that it can
clear the MDSS configuration. Add a reference to the relevant reset.

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
Not tested on a device, but should be necessary on v6.17 kernel.
---
 arch/arm64/boot/dts/qcom/sm8250.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
index b30aea8b05409094837ad494389d7c22fa1ba7dd..9bcb2c4c34388f343fb93083977b8d2e9a724bb3 100644
--- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
@@ -4687,6 +4687,8 @@ mdss: display-subsystem@...0000 {
 
 			iommus = <&apps_smmu 0x820 0x402>;
 
+			resets = <&dispcc DISP_CC_MDSS_CORE_BCR>;
+
 			status = "disabled";
 
 			#address-cells = <2>;

---
base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a
change-id: 20250930-sm8250-mdss-reset-307c3e921d03

Best regards,
-- 
Luca Weiss <luca.weiss@...rphone.com>