linux-kernel - Re: [PATCHv5 09/10] DTS: ARM: OMAP3-N900: Add SSI support

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Date:	Wed, 21 May 2014 23:50:55 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Shubhrajyoti Datta <omaplinuxkernel@...il.com>,
	Carlos Chinea <cch.devel@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>,
	Ивайло Димитров 
	<freemangordon@....bg>,
	Joni Lapilainen <joni.lapilainen@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Pavel Machek <pavel@....cz>, Paul Walmsley <paul@...an.com>
Subject: Re: [PATCHv5 09/10] DTS: ARM: OMAP3-N900: Add SSI support

Hi,

On Wed, May 21, 2014 at 12:45:28PM -0700, Tony Lindgren wrote:
> * Tony Lindgren <tony@...mide.com> [140521 11:44]:
> > * Sebastian Reichel <sre@...nel.org> [140521 11:26]:
> > > The hwmod data may be wrong. The information from commit
> > > 398917ce161e10d3c66afaefdb89c73c64c4b02d was simply
> > > interpolated from all information I found. The OMAP3
> > > public TRM does not contain *any* information about the
> > > ssi IP-Core.
> 
> Yeah seems to be just reserved..

Right. The only documentation of the SSI module is existing
code sent by Carlos / included in the maemo kernel.

> > It's probably something with the sysc or idlemodes that
> > keeps things from idling. Maybe wrong address? Or wrong
> > flags? I'm pretty sure it was the first .dts patch out of
> > these two as the second one alone did not apply.
> 
> Hmm yeah below is probably how it should be, does this
> work for you? With this fix applied and your ssi dts
> patches n900 keeps hitting off-idle for me.

I can confirm, that the N900 hits idle states when the DT
patch and the hwmod patch is applied. I have not actually
tested if it also works without your hwmod patch.

There are still problems with the idle state if the driver is
actually loaded (and I see 100% runtime pm usage in powertop),
but that can be fixed later.

Feel free to add Tested-by/Acked-By to the hwmod patch.

-- Sebastian

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