linux-kernel - Re: [PATCH 8/8] soc: mtk-svs: mt8192: fix bank data

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Message-ID: <66e1ddad-a7c2-215c-28b6-49e2b7f583a6@collabora.com>
Date:   Thu, 29 Sep 2022 10:26:12 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...nel.org, roger.lu@...iatek.com,
        jia-wei.chang@...iatek.com
Cc:     nfraprado@...labora.com, khilman@...libre.com,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 8/8] soc: mtk-svs: mt8192: fix bank data

Il 28/09/22 17:55, matthias.bgg@...nel.org ha scritto:
> From: Matthias Brugger <matthias.bgg@...il.com>
> 
> Values vmax and dvt_fixed are not changed at runtime, set them as needed
> in the svs_banks struct.
> 
> Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
> 

Honestly, I'm undecided on this one... because the vmax += dvt_fixed is something
descriptive of how the SVS works.
Since you're simply removing one addition, in a path that gets executed only once
in a kernel boot life, that's not even going to improve performance at all...

Right now, I'm more for dropping this change than keeping it.

Cheers,
Angelo

> ---
> 
>   drivers/soc/mediatek/mt8192-svs.h     | 4 ++--
>   drivers/soc/mediatek/mtk-svs-mt8192.c | 2 --
>   2 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mt8192-svs.h b/drivers/soc/mediatek/mt8192-svs.h
> index 6571ebcb2c0f..bf8c6030428f 100644
> --- a/drivers/soc/mediatek/mt8192-svs.h
> +++ b/drivers/soc/mediatek/mt8192-svs.h
> @@ -16,7 +16,7 @@ static struct svs_bank svs_mt8192_banks[] = {
>   		.turn_freq_base		= 688000000,
>   		.volt_step		= 6250,
>   		.volt_base		= 400000,
> -		.vmax			= 0x60,
> +		.vmax			= 0x61,
>   		.vmin			= 0x1a,
>   		.age_config		= 0x555555,
>   		.dc_config		= 0x1,
> @@ -41,7 +41,7 @@ static struct svs_bank svs_mt8192_banks[] = {
>   		.turn_freq_base		= 688000000,
>   		.volt_step		= 6250,
>   		.volt_base		= 400000,
> -		.vmax			= 0x60,
> +		.vmax			= 0x66,
>   		.vmin			= 0x1a,
>   		.age_config		= 0x555555,
>   		.dc_config		= 0x1,
> diff --git a/drivers/soc/mediatek/mtk-svs-mt8192.c b/drivers/soc/mediatek/mtk-svs-mt8192.c
> index 838a94834741..183acf2829f0 100644
> --- a/drivers/soc/mediatek/mtk-svs-mt8192.c
> +++ b/drivers/soc/mediatek/mtk-svs-mt8192.c
> @@ -40,8 +40,6 @@ bool svs_mt8192_efuse_parsing(struct svs_platform *svsp)
>   			svsb->dcbdet = (svsp->efuse[17] >> 16) & GENMASK(7, 0);
>   			svsb->dcmdet = (svsp->efuse[17] >> 24) & GENMASK(7, 0);
>   		}
> -
> -		svsb->vmax += svsb->dvt_fixed;
>   	}
>   
>   	ret = svs_thermal_efuse_get_data(svsp);