linux-kernel - Re: [PATCH v4 3/8] scsi: ufs: ufs-mediatek: Remove useless mediatek,ufs-boost-crypt property

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Message-ID: <d11e174d85c7f5a9b4ffe5fb2bb15dfd5823f83e.camel@mediatek.com>
Date: Tue, 16 Apr 2024 13:05:53 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
To: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"jejb@...ux.ibm.com" <jejb@...ux.ibm.com>, "devicetree@...r.kernel.org"
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	<krzysztof.kozlowski+dt@...aro.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>
Subject: Re: [PATCH v4 3/8] scsi: ufs: ufs-mediatek: Remove useless
 mediatek,ufs-boost-crypt property

On Tue, 2024-04-16 at 12:38 +0200, AngeloGioacchino Del Regno wrote:
> Il 16/04/24 12:31, Peter Wang (王信友) ha scritto:
> > 
> > > Yes this causes -> less than half of a millisecond <- of
> > > additional
> > > boot time
> > > if the dvfsrc-supply is present but boost-microvolt is not.
> > > 
> > > I really don't see the problem with that :-)
> > > 
> > 
> > Adding a little bit of boot time to one smartphone might not be a
> > problem, but when you consider a billion smartphones each adding a
> > little bit, the cumulative effect becomes significant. The power
> > consumption of these accumulated times will continue to increase,
> > contributing to the Earth's carbon emissions. Moreover, removing
> > the
> > master switch for this feature doesn't seem to have any benefits
> > other
> > than not having to set it in the DTS. Similarly, the master switch
> > for
> > VA09 seems to have more disadvantage.
> > 
> 
> Sorry, but I still don't see how a few *microseconds* more of boot
> time can
> be significant, even related to power consumption during boot.
> 
> If that was a few milliseconds, then I'd agree with you, but that's
> not the case.
> 
> Removing the master switch has a benefit: you *lose* a few
> microseconds of boot
> time (so, boots in *few microseconds LESS*) on platforms that would
> have this set
> in devicetree, as this property is redundant with the other
> activation checks
> for those features.
> 
> So, there you go: if the majority of MediaTek platforms are already
> using this
> crypt boost feature, then this commit reduces carbon emissions, as
> those would
> boot in a few less microseconds.
> 

But the majority platfomrs dosen't need this feature.
This feature is only for legacy chip which at least 4 years ago.

Thanks
Peter


> Regards,
> Angelo
> 
> > 
> > > Regards,
> > > Angelo
> > > 
> > > > Thanks.
> > > > Peter
> > > > 
> > > > 
> > > > 
> > > > >    	ret = ufs_mtk_init_va09_pwr_ctrl(hba);
> > > > >    	if (ret)
> > > 
> > > 
> 
>