linux-kernel - [PATCH] needsreview! arm64: dts: qcom: sdm845: Add missing MDSS reset

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Message-Id: <20260112-mdss-reset-v1-1-af7c572204d3@ixit.cz>
Date: Mon, 12 Jan 2026 13:33:18 +0100
From: David Heidelberg via B4 Relay <devnull+david.ixit.cz@...nel.org>
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: Petr Hodina <petr.hodina@...tonmail.com>, linux-arm-msm@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 phone-devel@...r.kernel.org, David Heidelberg <david@...t.cz>
Subject: [PATCH] needsreview! arm64: dts: qcom: sdm845: Add missing MDSS
 reset

From: David Heidelberg <david@...t.cz>

If the OS does not support recovering the state left by the
bootloader it needs a way to reset display hardware, so that it can
start from a clean state. Add a reference to the relevant reset.

Signed-off-by: David Heidelberg <david@...t.cz>
---
It efficiently fixes nothing for us (at least what we're aware), so I
assume the state left by bootloader is good enough

I sending this as a something "which seems right" and works for us in
sdm845-next tree.

David
---
 arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index bf2f9c04adba7..75c192eddc57c 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -4550,6 +4550,7 @@ mdss: display-subsystem@...0000 {
 			reg-names = "mdss";

 			power-domains = <&dispcc MDSS_GDSC>;
+			resets = <&dispcc DISP_CC_MDSS_RSCC_BCR>;

 			clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
 				 <&dispcc DISP_CC_MDSS_MDP_CLK>;

---
base-commit: f417b7ffcbef7d76b0d8860518f50dae0e7e5eda
change-id: 20260112-mdss-reset-06988f05af96

Best regards,
-- 
David Heidelberg <david@...t.cz>