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

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Message-ID: <15e41ffe-66f1-43ec-b0af-241041c25f9d@oss.qualcomm.com>
Date: Fri, 2 Jan 2026 15:02:58 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bryan O'Donoghue <bod@...nel.org>, 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 1/2/26 1:59 PM, Bryan O'Donoghue wrote:
> 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 :)

Writes are posted (Device-nGnRE, note the E attribute is set)

https://documentation-service.arm.com/static/63a43e333f28e5456434e18b

Konrad