linux-kernel - Re: [PATCHv5 0/2] soc: qcom: llcc: Support chipsets that can write to llcc regs

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Date:   Mon, 26 Oct 2020 18:03:31 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCHv5 0/2] soc: qcom: llcc: Support chipsets that can write to
 llcc regs

Hi Bjorn,

On 2020-09-15 12:25, Sai Prakash Ranjan wrote:
> Older chipsets may not be allowed to configure certain LLCC registers
> as that is handled by the secure side software. However, this is not
> the case for newer chipsets and they must configure these registers
> according to the contents of the SCT table, while keeping in mind that
> older targets may not have these capabilities. So add support to allow
> such configuration of registers to enable capacity based allocation
> and power collapse retention for capable chipsets.
> 
> Reason for choosing capacity based allocation rather than the default
> way based allocation is because capacity based allocation allows more
> finer grain partition and provides more flexibility in configuration.
> As for the retention through power collapse, it has an advantage where
> the cache hits are more when we wake up from power collapse although
> it does burn more power but the exact power numbers are not known at
> the moment.
> 


Gentle ping!

Thanks,
Sai

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