linux-kernel - Re: [Patch v1 09/10] memory: tegra: get number of enabled mc channels

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Message-ID: <86f94266-d88e-af82-0352-876bc369f6a2@nvidia.com>
Date:   Fri, 13 Jan 2023 20:34:18 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <treding@...dia.com>, <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 09/10] memory: tegra: get number of enabled mc channels



On 22/12/22 17:07, Krzysztof Kozlowski wrote:
> External email: Use caution opening links or attachments
> 
> 
> On 20/12/2022 17:02, Sumit Gupta wrote:
>> Get number of MC channels which are actually enabled
>> in current boot configuration.
> 
> Why? You don't do anything with it. Commit msg should give the reason of
> changes.
> 
> 
> Best regards,
> Krzysztof
> 

CPU OPP tables have per channel bandwidth info. The "mc->num_channels" 
is used in [1] (Patch v1 10/10) to make the per MC channel bandwidth 
requested by the CPU cluster as a multiple of number of the enabled mc 
channels.

Will update the commit description with this info.

[1] 
https://lore.kernel.org/lkml/20221220160240.27494-1-sumitg@nvidia.com/T/#m3ac150a86977e89b97c5d19c60384f29d7a01d21