linux-kernel - Re: [PATCH V4 09/14] cpufreq: mediatek: Refine mtk_cpufreq_voltage

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Message-ID: <f0837023-64ce-7a3b-d3c7-e713f48b2c6e@collabora.com>
Date:   Fri, 22 Apr 2022 10:20:57 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>, rafael@...nel.org,
        viresh.kumar@...aro.org, robh+dt@...nel.org, krzk+dt@...nel.org,
        matthias.bgg@...il.com
Cc:     jia-wei.chang@...iatek.com, roger.lu@...iatek.com,
        hsinyi@...gle.com, khilman@...libre.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH V4 09/14] cpufreq: mediatek: Refine
 mtk_cpufreq_voltage_tracking()

Il 22/04/22 09:52, Rex-BC Chen ha scritto:
> From: Jia-Wei Chang <jia-wei.chang@...iatek.com>
> 
> Because the difference of sram and proc should in a range of min_volt_shift
> and max_volt_shift. We need to adjust the sram and proc step by step.
> 
> We replace VOLT_TOL (voltage tolerance) with the platform data and update the
> logic to determine the voltage boundary and invoking regulator_set_voltage.
> 
> - Use 'sram_min_volt' and 'sram_max_volt' to determine the voltage boundary
>    of sram regulator.
> - Use (sram_min_volt - min_volt_shift) and 'proc_max_volt' to determine the
>    voltage boundary of vproc regulator.
> 
> Moreover, to prevent infinite loop when tracking voltage, we calculate the
> maximum value for each platform data.
> We assume min voltage is 0 and tracking target voltage using
> min_volt_shift for each iteration.
> The retry_max is 3 times of expeted iteration count.
> 
> Signed-off-by: Jia-Wei Chang <jia-wei.chang@...iatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>


Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>