linux-kernel - Re: [PATCH v2 1/4] dt-bindings: firmware: qcom,scm: Document that SCM can be dma-coherent

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Message-ID: <e89e574c-db6d-877b-462c-bb91cc9d9ff1@linaro.org>
Date:   Sun, 18 Jun 2023 10:07:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>, andersson@...nel.org
Cc:     amit.pundir@...aro.org, Will Deacon <will@...nel.org>,
        sumit.semwal@...aro.org, linux-arm-msm@...r.kernel.org,
        konrad.dybcio@...ainline.org, linux-arm-kernel@...ts.infradead.org,
        Stephan Gerhold <stephan@...hold.net>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Nikita Travkin <nikita@...n.ru>,
        Stephen Boyd <swboyd@...omium.org>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Das Srinagesh <quic_gurus@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Robert Marko <robimarko@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: firmware: qcom,scm: Document that SCM
 can be dma-coherent

On 16/06/2023 17:14, Douglas Anderson wrote:
> Trogdor devices use firmware backed by TF-A instead of Qualcomm's
> normal TZ. On TF-A we end up mapping memory as cacheable. Specifically,
> you can see in Trogdor's TF-A code [1] in qti_sip_mem_assign() that we
> call qti_mmap_add_dynamic_region() with MT_RO_DATA. This translates
> down to MT_MEMORY instead of MT_NON_CACHEABLE or MT_DEVICE.
> 
> Let's allow devices like trogdor to be described properly by allowing
> "dma-coherent" in the SCM node.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org

2

Best regards,
Krzysztof