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

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Date: Tue, 16 Apr 2024 10:31:25 +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"
	<devicetree@...r.kernel.org>, "avri.altman@....com" <avri.altman@....com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"bvanassche@....org" <bvanassche@....org>, "broonie@...nel.org"
	<broonie@...nel.org>, "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "robh@...nel.org"
	<robh@...nel.org>, "lgirdwood@...il.com" <lgirdwood@...il.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "krzysztof.kozlowski+dt@...aro.org"
	<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


> 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.


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