Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <c65313c7-c1e1-3a51-9fff-4324701ebfd7@linaro.org>
Date:   Mon, 19 Jun 2023 12:01:27 +0200
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.12.0
Subject: Re: [PATCH v2 1/4] dt-bindings: firmware: qcom,scm: Document that SCM
 can be dma-coherent
Content-Language: en-US
To:     Konrad Dybcio <konrad.dybcio@linaro.org>,
        Douglas Anderson <dianders@chromium.org>, andersson@kernel.org
Cc:     amit.pundir@linaro.org, Will Deacon <will@kernel.org>,
        sumit.semwal@linaro.org, linux-arm-msm@vger.kernel.org,
        konrad.dybcio@somainline.org, linux-arm-kernel@lists.infradead.org,
        Stephan Gerhold <stephan@gerhold.net>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        Nikita Travkin <nikita@trvn.ru>,
        Stephen Boyd <swboyd@chromium.org>,
        Sibi Sankar <quic_sibis@quicinc.com>,
        Andy Gross <agross@kernel.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Das Srinagesh <quic_gurus@quicinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Robert Marko <robimarko@gmail.com>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20230616081440.v2.1.Ie79b5f0ed45739695c9970df121e11d724909157@changeid>
 <e89e574c-db6d-877b-462c-bb91cc9d9ff1@linaro.org>
 <23cecdde-2b24-a472-1497-5da9f1158c00@linaro.org>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <23cecdde-2b24-a472-1497-5da9f1158c00@linaro.org>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 19/06/2023 12:00, Konrad Dybcio wrote:
> On 18.06.2023 10:07, Krzysztof Kozlowski wrote:
>> 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@chromium.org
>>
>> 2
> Forgot to press alt or something

D'oh!

Best regards,
Krzysztof