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Message-ID: <502322f1-4f66-4922-bc4e-46bacac23410@linaro.org>
Date: Tue, 2 Apr 2024 16:34:28 +0200
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Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: msm8998: set
 qcom,no-msa-ready-indicator for wifi
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
 Marc Gonzalez <mgonzalez@freebox.fr>, 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>,
 Jami Kettunen <jamipkettunen@gmail.com>,
 Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
References: <fd26ce4a-a9f3-4ada-8d46-ed36fb2456ca@freebox.fr>
 <5cdad89c-282a-4df5-a286-b8404bc4dd81@freebox.fr>
 <252618e8-9e80-4774-a96c-caa7f838ef01@linaro.org>
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From: Konrad Dybcio <konrad.dybcio@linaro.org>
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In-Reply-To: <252618e8-9e80-4774-a96c-caa7f838ef01@linaro.org>
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On 30.03.2024 7:25 PM, Krzysztof Kozlowski wrote:
> On 28/03/2024 18:39, Marc Gonzalez wrote:
>> 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.
>>
> 
> I think you got pretty clear comments:
> 
> "This sounds more like a firmware feature, not a hardware feature."
> 
> "This is why having this property in DT does not look right
> place for this."

Translating from dt maintainer speak to English, a functionally-equivalent
resolution of adding an of_machine_is_compatible("qcom,msm8998") is more
in line with the guidelines of not sprinkling firmware specifics in DTs

Konrad