linux-kernel - Re: [PATCH 0/2] Qualcomm SDM845 SLPI DSP driver support

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Message-ID: <d827dafb-5b97-7ba3-542c-e3f60d4fb468@linaro.org>
Date:   Sun, 26 Mar 2023 10:51:56 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dylan Van Assche <me@...anvanassche.be>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org
Subject: Re: [PATCH 0/2] Qualcomm SDM845 SLPI DSP driver support

On 25/03/2023 14:21, Dylan Van Assche wrote:
> The Qualcomm SDM845 SoC has a separate SLPI (Sensor Low Power Island)
> DSP for sensors connected to the SoC which is responsible for exposing
> sensors to userspace, power saving, and other features. 
> While sensors are connected to GPIOs of the SoC, they cannot be used
> because the hypervisor blocks direct access to the sensors, thus the 
> DSP must be used to access any sensor on this SoC. The SLPI DSP uses a
> GLink edge (dsps) to communicate with the host and has a FastRPC interface
> to load files from the host filesystem such as sensor configuration files.
> The FastRPC interface does not use regular FastRPC Compute Banks
> but instead uses an allocated CMA region through which communication happens.
> 
> This set of patches adds support to drivers for the SLPI DSP:
> 1. Configure the permissions of assigned DSP memory through the hypervisor.
> 2. Allocate a remote heap when the FastRPC session ID is 0 instead of using 
> a Compute Bank directly.
> 3. Add the SLPI remoteproc resource to the q6v5_pas driver to enable support
> for it in the driver.
> over QRTR.
> 
> DTS changes to enable the SLPI DSP in the SDM845 DTS and hardware
> e.g. Oneplus 6 and SHIFTPHONES SHIFT6mq will be send once the driver changes
> are applied.

No, as we explained on IRC, we expect DTS to be sent the same time.

Best regards,
Krzysztof