linux-kernel - Re: [PATCH v3 3/9] remoteproc: qcom_q6v5

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Message-ID: <1dcc9380-c2c2-4263-93ad-71edce86b0da@kernel.org>
Date: Fri, 2 Jan 2026 12:59:17 +0000
From: Bryan O'Donoghue <bod@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 barnabas.czeman@...nlining.org
Cc: Bjorn Andersson <andersson@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Stephan Gerhold <stephan@...hold.net>,
 linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/9] remoteproc: qcom_q6v5_mss: Add MDM9607

On 02/01/2026 12:00, Konrad Dybcio wrote:
>> Is there an io-fabric in the world which exceeds 1 microsecond to perform a write transaction ?
> Writes on arm64 aren't usually observable from the remote endpoint when
> you would expect them to, they can be buffered unless there's an explicit
> readback right afterwards (which creates a dependency that the processor
> will fulfill)

I don't mean write-combining cache, I mean posted versus non-posted 
writes which is a feature of the front-side-bus :)

---
bod