linux-kernel - Re: [PATCH] arm64: dts: qcom: qcs615: disable the CTI device of the camera block

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Message-ID: <9a156925-cf7b-4d2e-88a8-fdfed5528553@quicinc.com>
Date: Tue, 27 May 2025 18:32:56 +0800
From: Jie Gan <quic_jiegan@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Jie Gan
	<jie.gan@....qualcomm.com>,
        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: Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Jinlong Mao
	<quic_jinlmao@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: qcs615: disable the CTI device of the
 camera block



On 5/27/2025 6:23 PM, Konrad Dybcio wrote:
> On 5/27/25 3:52 AM, Jie Gan wrote:
>> Disable the CTI device of the camera block to prevent potential NoC errors
>> during AMBA bus device matching.
>>
>> The clocks for the Qualcomm Debug Subsystem (QDSS) are managed by aoss_qmp
>> through a mailbox. However, the camera block resides outside the AP domain,
>> meaning its QDSS clock cannot be controlled via aoss_qmp.
> 
> Which clock drives it then?

It's qcom,aoss-qmp.

clk_prepare->qmp_qdss_clk_prepare
https://elixir.bootlin.com/linux/v6.15-rc7/source/drivers/soc/qcom/qcom_aoss.c#L280

Thanks,
Jie

> 
> Konrad