linux-kernel - Re: [Patch v1 01/10] memory: tegra: add interconnect support for DRAM scaling in Tegra234

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Message-ID: <6f4dc52f-934e-283f-ac0d-917794c896a8@nvidia.com>
Date:   Tue, 17 Jan 2023 18:33:53 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <treding@...dia.com>,
        <krzysztof.kozlowski@...aro.org>, <dmitry.osipenko@...labora.com>,
        <viresh.kumar@...aro.org>, <rafael@...nel.org>,
        <jonathanh@...dia.com>, <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     <sanjayc@...dia.com>, <ksitaraman@...dia.com>, <ishah@...dia.com>,
        <bbasu@...dia.com>, Sumit Gupta <sumitg@...dia.com>
Subject: Re: [Patch v1 01/10] memory: tegra: add interconnect support for DRAM
 scaling in Tegra234



On 21/12/22 22:14, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
> 
> 
> 21.12.2022 11:05, Sumit Gupta пишет:
>> On 20/12/22 23:37, Dmitry Osipenko wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> 20.12.2022 19:02, Sumit Gupta пишет:
>>>> +#ifndef MEMORY_TEGRA_ICC_H
>>>> +#define MEMORY_TEGRA_ICC_H
>>>> +
>>>> +enum tegra_icc_client_type {
>>>> +     TEGRA_ICC_NONE,
>>>> +     TEGRA_ICC_NISO,
>>>> +     TEGRA_ICC_ISO_DISPLAY,
>>>> +     TEGRA_ICC_ISO_VI,
>>>> +     TEGRA_ICC_ISO_AUDIO,
>>>> +     TEGRA_ICC_ISO_VIFAL,
>>>> +};
>>>
>>> You using only TEGRA_ICC_NISO and !TEGRA_ICC_NISO in the code.
>>>
>>> include/soc/tegra/mc.h defines TAG_DEFAULT/ISO, please drop all these
>>> duplicated and unused "types" unless there is a good reason to keep them
>>>
>>
>> These type are used while defining clients in "tegra234_mc_clients[]"
>> and its passed to BPMP-FW which has handling for each client type.
> 
> The type should be based on the ICC tag, IMO. AFAICS, type isn't fixed
> in FW and you can set both ISO and NISO BW, hence it's up to a device
> driver to select the appropriate tag.
> 

Type for a MC client is fixed. So, adding the tag and giving option to 
client driver won't have impact.
Also, we need to pass the type to BPMP from bw set api. But the tag info 
is available to aggregate api and not set.