linux-kernel - Re: [Patch v2 0/9] Tegra234 Memory interconnect support

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Message-ID: <c8cf2435-8b18-7af7-c751-267021142f5a@linaro.org>
Date:   Mon, 6 Mar 2023 16:05:22 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sumit Gupta <sumitg@...dia.com>, treding@...dia.com,
        dmitry.osipenko@...labora.com, viresh.kumar@...aro.org,
        rafael@...nel.org, jonathanh@...dia.com, robh+dt@...nel.org,
        lpieralisi@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, mmaddireddy@...dia.com, kw@...ux.com,
        bhelgaas@...gle.com, vidyas@...dia.com, sanjayc@...dia.com,
        ksitaraman@...dia.com, ishah@...dia.com, bbasu@...dia.com
Subject: Re: [Patch v2 0/9] Tegra234 Memory interconnect support

On 20/02/2023 15:05, Sumit Gupta wrote:
> This patch series adds memory interconnect support for Tegra234 SoC.
> It is used to dynamically scale DRAM Frequency as per the bandwidth
> requests from different Memory Controller (MC) clients.
> MC Clients use ICC Framework's icc_set_bw() api to dynamically request
> for the DRAM bandwidth (BW). As per path, the request will be routed
> from MC to the EMC driver. MC driver passes the request info like the
> Client ID, type, and frequency request info to the BPMP-FW which will
> set the final DRAM freq considering all exisiting requests.
> 
> MC and EMC are the ICC providers. Nodes in path for a request will be:
>      Client[1-n] -> MC -> EMC -> EMEM/DRAM
> 
> The patch series also adds interconnect support in below client drivers:
> 1) CPUFREQ driver for scaling bandwidth with CPU frequency. For that,
>    added per cluster OPP table which will be used in the CPUFREQ driver
>    by requesting the minimum BW respective to the given CPU frequency in
>    the OPP table of given cluster.
> 2) PCIE driver to request BW required for different modes.

No dependencies or ordering written, so I am free to take memory
controller bits, I assume.

Best regards,
Krzysztof