From: Leo Yan <leo.yan@arm.com>
To: Jie Gan <jie.gan@oss.qualcomm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Tingwei Zhang <tingwei.zhang@oss.qualcomm.com>,
Jingyi Wang <jingyi.wang@oss.qualcomm.com>,
Abel Vesa <abel.vesa@oss.qualcomm.com>,
Mike Leach <mike.leach@arm.com>,
James Clark <james.clark@linaro.org>,
Yuanfang Zhang <yuanfang.zhang@oss.qualcomm.com>,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, coresight@lists.linaro.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: kaanapali: fix traceNoC probe issue
Date: Wed, 24 Jun 2026 16:16:10 +0100 [thread overview]
Message-ID: <20260624151610.GC575984@e132581.arm.com> (raw)
In-Reply-To: <25d7d3a1-58e0-4f25-a73a-59a978130c47@oss.qualcomm.com>
On Wed, Jun 24, 2026 at 11:08:32PM +0800, Jie Gan wrote:
[...]
> > Why does it fail ? power management ? hw broken ? Is it really AMBA or
> > do you pretend that to be an AMBA device by faking the CID/PID?
>
> The CID reads as 0 from the register, which I suspect is a hardware design
> issue. I have not yet confirmed this with the hardware team. As a
> workaround, I provided a fake periphid via a DT property to bypass
> amba_read_periphid.
>
>
> Leo commented in other thread:
> >>tnoc.c registers both an AMBA driver and a platform driver. Shouldn't >>it
> >>be registered as a platform device instead?
>
> The platform driver is intended for the interconnect TraceNoC device and is
> not designed to allocate an ATID. The issue is that the TPDM device borrows
> the ATID from the TraceNoC device, resulting in the ATID always being 0 when
> associated with an interconnect NoC device.
>
> However, I believe it is acceptable to allocate an ATID for the itNoC device
> and the issue can be fixed with this way.
I think so.
next prev parent reply other threads:[~2026-06-24 15:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-24 9:49 [PATCH v2 0/2] Fix traceNoC probe issue on Kaanapali Jie Gan
2026-06-24 9:49 ` [PATCH v2 1/2] dt-bindings: arm: qcom,coresight-tnoc: allow arm,primecell-periphid Jie Gan
2026-06-24 9:54 ` sashiko-bot
2026-06-24 9:49 ` [PATCH v2 2/2] arm64: dts: qcom: kaanapali: fix traceNoC probe issue Jie Gan
2026-06-24 13:27 ` Konrad Dybcio
2026-06-24 13:48 ` Jie Gan
2026-06-24 13:51 ` Suzuki K Poulose
2026-06-24 15:08 ` Jie Gan
2026-06-24 15:16 ` Leo Yan [this message]
2026-06-24 14:25 ` Leo Yan
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