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[188.141.3.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45e037d638dsm168083065e9.22.2025.09.15.04.02.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 15 Sep 2025 04:02:35 -0700 (PDT) Message-ID: <85b6de36-4f0a-41f4-a803-77355d5da3af@linaro.org> Date: Mon, 15 Sep 2025 12:02:31 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 3/9] arm64: dts: qcom: x1-el2: Disable IRIS for now To: Stephan Gerhold , Bjorn Andersson , Konrad Dybcio Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Dikshita Agarwal , Vikash Garodia , Neil Armstrong , Alexey Klimov , Anthony Ruhier , Stefan Schmidt References: <20250915-x1e-iris-dt-v2-0-1f928de08fd4@linaro.org> <20250915-x1e-iris-dt-v2-3-1f928de08fd4@linaro.org> From: Bryan O'Donoghue Content-Language: en-US In-Reply-To: <20250915-x1e-iris-dt-v2-3-1f928de08fd4@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 15/09/2025 11:06, Stephan Gerhold wrote: > The reset and IOMMU management for remoteprocs like IRIS is implemented in > the hypervisor for older targets such as X1E [1]. When booting Linux/KVM > directly in EL2, this functionality is missing and the PAS interface > normally used by IRIS to boot the video firmware is not working. > > The Venus driver supports starting the video firmware without using the PAS > interface. The same code also works for X1E when using KVM. However, for > the new IRIS dt-bindings it was decided to avoid using the dummy > "video-firmware" node in the device tree to describe the IOMMU [2]. > Discussion is still ongoing how to describe this properly [3]. > > To avoid regressions when running using KVM, add a TODO in x1-el2.dtso for > now and disable IRIS even when it was enabled by the board. > > [1]: https://resources.linaro.org/en/resource/sF8jXifdb9V1mUefdbfafa > [2]: https://lore.kernel.org/r/20250823155349.22344-2-krzysztof.kozlowski@linaro.org/ > [3]: https://lore.kernel.org/r/20250819165447.4149674-12-mukesh.ojha@oss.qualcomm.com/ > > Signed-off-by: Stephan Gerhold > --- > arch/arm64/boot/dts/qcom/x1-el2.dtso | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/arm64/boot/dts/qcom/x1-el2.dtso b/arch/arm64/boot/dts/qcom/x1-el2.dtso > index 380441deca65d1b443962fbe6151f4aadd918383..2d1c9151cf1b4aca79f7ad67328ffc3c721b9dc3 100644 > --- a/arch/arm64/boot/dts/qcom/x1-el2.dtso > +++ b/arch/arm64/boot/dts/qcom/x1-el2.dtso > @@ -12,6 +12,11 @@ &gpu_zap_shader { > status = "disabled"; > }; > > +&iris { > + /* TODO: Add video-firmware iommus to start IRIS from EL2 */ > + status = "disabled"; > +}; > + > /* > * When running under Gunyah, this IOMMU is controlled by the firmware, > * however when we take ownership of it in EL2, we need to configure > Reviewed-by: Bryan O'Donoghue