linux-kernel - [PATCH] arm64: dts: qcom: msm8939: revert use of APCS mbox for RPM

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Message-Id: <20240904-msm8939-rpm-apcs-fix-v1-1-b608e7e48fe1@linaro.org>
Date: Wed, 04 Sep 2024 11:26:55 -0700
From: Fabien Parent <fabien.parent@...aro.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>, Luca Weiss <luca@...aweiss.eu>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Fabien Parent <fabien.parent@...aro.org>
Subject: [PATCH] arm64: dts: qcom: msm8939: revert use of APCS mbox for RPM

Commit 22e4e43484c4 ("arm64: dts: qcom: msm8939: Use mboxes
properties for APCS") broke the boot on msm8939 platforms.

The issue comes from the SMD driver failing to request the mbox
channel because of circular dependencies:
	1. rpm -> apcs1_mbox -> rpmcc (RPM_SMD_XO_CLK_SRC) -> rpm.
	2. rpm -> apcs1_mbox -> gcc -> rpmcc (RPM_SMD_XO_CLK_SRC) -> rpm
	3. rpm -> apcs1_mbox -> apcs2 -> gcc -> rpmcc (RPM_SMD_XO_CLK_SRC) -> rpm

To fix this issue let's switch back to using the deprecated
qcom,ipc property for the RPM node.

Fixes: 22e4e43484c4 ("arm64: dts: qcom: msm8939: Use mboxes properties for APCS")
Signed-off-by: Fabien Parent <fabien.parent@...aro.org>
---
 arch/arm64/boot/dts/qcom/msm8939.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/msm8939.dtsi b/arch/arm64/boot/dts/qcom/msm8939.dtsi
index 46d9480cd464..39405713329b 100644
--- a/arch/arm64/boot/dts/qcom/msm8939.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8939.dtsi
@@ -248,7 +248,7 @@ rpm: remoteproc {
 
 		smd-edge {
 			interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
-			mboxes = <&apcs1_mbox 0>;
+			qcom,ipc = <&apcs1_mbox 8 0>;
 			qcom,smd-edge = <15>;
 
 			rpm_requests: rpm-requests {

---
base-commit: d8abb73f584772eaafa95a447c90f1c02dba0dec
change-id: 20240903-msm8939-rpm-apcs-fix-8924b8b7f593

Best regards,
-- 
Fabien Parent <fabien.parent@...aro.org>