linux-kernel - Re: [PATCH 6/9] ARM: tegra: Export tegra_powergate_power

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Message-ID: <20140709124344.GK23218@tbergstrom-lnx.Nvidia.com>
Date:	Wed, 9 Jul 2014 15:43:44 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Stephen Warren <swarren@...dotorg.org>,
	Mikko Perttunen <mperttunen@...dia.com>,
	"tj@...nel.org" <tj@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: [PATCH 6/9] ARM: tegra: Export tegra_powergate_power_on

On Wed, Jul 09, 2014 at 02:04:02PM +0200, Thierry Reding wrote:
> > For those 2 domains we can find the necessary clocks and resets by parsing
> > the relevant existing DT nodes for PCIe and gr3d. For clocks, this isn't
> > even needed as we can always register some extra clkdev's to get them. There
> > is no equivalent for resets so we have to parse the gr3d and pcie DT nodes,
> > but that's not too bad I think.
> 
> Even if we could really do this, at this point I don't see an advantage.
> All that it would be doing is move to some subsystem that doesn't quite
> match what we need just for the sake of moving to that subsystem. Having
> a Tegra-specific API doesn't sound so bad anymore.
> 

The advantage would be that we can use LP0/SC7 as a cpuidle state. Also system
resume from LP0 can be faster as we potentially don't have to resume all
domains at once.

Cheers,

Peter.

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