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Message-ID: <0914f96e-fcfd-4088-924a-fc1991bce75f@freebox.fr>
Date: Mon, 29 Apr 2024 16:07:27 +0200
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Subject: [PATCH v3 3/3] arm64: dts: qcom: msm8998: set
 qcom,no-msa-ready-indicator for wifi
From: Marc Gonzalez <mgonzalez@freebox.fr>
To: Kalle Valo <kvalo@kernel.org>, Jeff Johnson <quic_jjohnson@quicinc.com>,
 ath10k <ath10k@lists.infradead.org>
Cc: wireless <linux-wireless@vger.kernel.org>, DT
 <devicetree@vger.kernel.org>, MSM <linux-arm-msm@vger.kernel.org>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Pierre-Hugues Husson <phhusson@freebox.fr>, Arnaud Vrac <avrac@freebox.fr>,
 Bjorn Andersson <andersson@kernel.org>,
 Konrad Dybcio <konrad.dybcio@linaro.org>,
 Jami Kettunen <jamipkettunen@gmail.com>,
 Jeffrey Hugo <quic_jhugo@quicinc.com>,
 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
 Alexey Minnekhanov <alexeymin@postmarketos.org>
References: <ebbda69c-63c1-4003-bf97-c3adf3ccb9e3@freebox.fr>
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The ath10k driver waits for an "MSA_READY" indicator
to complete initialization. If the indicator is not
received, then the device remains unusable.

cf. ath10k_qmi_driver_event_work()

Several msm8998-based devices are affected by this issue.
Oddly, it seems safe to NOT wait for the indicator, and
proceed immediately when QMI_EVENT_SERVER_ARRIVE.

Jeff Johnson wrote:

  The feedback I received was "it might be ok to change all ath10k qmi
  to skip waiting for msa_ready", and it was pointed out that ath11k
  (and ath12k) do not wait for it.

  However with so many deployed devices, "might be ok" isn't a strong
  argument for changing the default behavior.

cf. also
https://wiki.postmarketos.org/wiki/Qualcomm_Snapdragon_835_(MSM8998)#WLAN

Signed-off-by: Marc Gonzalez <mgonzalez@freebox.fr>
---
 arch/arm64/boot/dts/qcom/msm8998.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi
index 67b8374ddf02f..4e6245095adfc 100644
--- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
@@ -3234,6 +3234,7 @@ wifi: wifi@18800000 {
 			iommus = <&anoc2_smmu 0x1900>,
 				 <&anoc2_smmu 0x1901>;
 			qcom,snoc-host-cap-8bit-quirk;
+			qcom,no-msa-ready-indicator;
 		};
 	};
 };
-- 
2.34.1