[PATCH v2] arm64: dts: qcom: qrb2210-rb1: disable cluster power domains

[PATCH v2] arm64: dts: qcom: qrb2210-rb1: disable cluster power domains

[Dmitry Baryshkov]

If cluster domain idle state is enabled on the RB1, the board becomes
significantly less responsive. Under certain circumstances (if some of
the devices are disabled in kernel config) the board can even lock up.

It seems this is caused by the MPM not updating wakeup timer during CPU
idle (in the same way the RPMh updates it when cluster idle state is
entered).

Disable cluster domain idle for the RB1 board until MPM driver is fixed
to cooperate with the CPU idle states.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
Changes since v1:
- Updated commit message, expaning the 'ping' phrase to point to the
  timer being updated by MPM driver (Mani)
---
 arch/arm64/boot/dts/qcom/qrb2210-rb1.dts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
index 64b2ab286279..6e9dd0312adc 100644
--- a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
+++ b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
@@ -177,6 +177,24 @@ vph_pwr: regulator-vph-pwr {
 	};
 };
 
+&CPU_PD0 {
+	/delete-property/ power-domains;
+};
+
+&CPU_PD1 {
+	/delete-property/ power-domains;
+};
+
+&CPU_PD2 {
+	/delete-property/ power-domains;
+};
+
+&CPU_PD3 {
+	/delete-property/ power-domains;
+};
+
+/delete-node/ &CLUSTER_PD;
+
 &gpi_dma0 {
 	status = "okay";
 };

---
base-commit: 596764183be8ebb13352b281a442a1f1151c9b06
change-id: 20240130-rb1-suspend-cluster-76d7b7582b6a

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Re: [PATCH v2] arm64: dts: qcom: qrb2210-rb1: disable cluster power domains

[Bjorn Andersson]

On Tue, 30 Jan 2024 18:48:08 +0200, Dmitry Baryshkov wrote:
> If cluster domain idle state is enabled on the RB1, the board becomes
> significantly less responsive. Under certain circumstances (if some of
> the devices are disabled in kernel config) the board can even lock up.
> 
> It seems this is caused by the MPM not updating wakeup timer during CPU
> idle (in the same way the RPMh updates it when cluster idle state is
> entered).
> 
> [...]

Applied, thanks!

[1/1] arm64: dts: qcom: qrb2210-rb1: disable cluster power domains
      commit: 7f492d48f08207e4ee23edc926b11de9f720aa61

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>