linux-kernel - Re: [PATCH v9 00/14] Tegra114 clockframework

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Date:	Thu, 4 Apr 2013 11:20:44 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Rob Herring <rob.herring@...xeda.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Simon Glass <sjg@...omium.org>,
	Rhyland Klein <rklein@...dia.com>,
	Pritesh Raithatha <praithatha@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	Andrew Chew <AChew@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 00/14] Tegra114 clockframework

On Thu, Apr 04, 2013 at 01:23:05AM +0200, Stephen Warren wrote:
> On 04/03/2013 12:27 PM, Stephen Warren wrote:
> > On 04/03/2013 11:52 AM, Stephen Warren wrote:
> >> On 04/03/2013 08:40 AM, Peter De Schrijver wrote:
> >>> This is the nineth version of the Tegra114 clockframework. It is based on the
> >>> next-20130320-fixed branch of
> >>> git://nv-tegra.nvidia.com/user/swarren/linux-2.6.git,
> > ... [it depends on]
> >>> http://patchwork.ozlabs.org/patch/233415/
> >>
> >> That is Joseph's "clocksource: tegra: enable arch_timer". Is this
> >> actually a dependency, or an optimization, or ...?
> >>
> >> Rob Herring objected to that patch since it isn't necessary if his
> >> series "ARM arch, sp804 and integrator timer CLKSRC_OF support" is applied.
> >>
> >> If I apply just your (Peter's) CCF series without Joseph's or Rob's
> >> patches, will everything still work, or is this a hard dependency to
> >> create a working system?
> > 
> > I manage to get this series applied on top of my local dev branch, based
> > on next-20130328 (it was painful). Testing indicates that there is no
> > dependency on Joseph's patch mentioned above; I could boot, log in, and
> > play audio (with local patches) with /or/ without Joseph's patch applied.
> > 
> > However, I still find that I need to revert f7db706 ARM: "7674/1: smp:
> > Avoid dummy clockevent being preferred over real hardware clock-event",
> > or I get a hard system hang right after the root fs is mounted. As such,
> > I not sure if it's worthwhile applying this series since it's unlikely
> > to actually work once merged into Torvalds' tree.
> > 
> > Do you have any idea what the problem is here?
> > 
> > I'll try rebasing my local test branch on top of the latest linux-next
> > just in case some other fix solved this already, but I'm not going to
> > hold my breath.
> 
> I've found the problem. My bootloader wasn't initializing the TSC and
> hence I guess it wasn't working properly, even with Joseph's patch to
> add a call to the initialization function.
> 

Ok.

> So, if I:
> 
> a) Fix my bootloader to enable TSC.
> 
> b) Merge Rob's patch series to enable the TSC. This is needed rather
> than Joseph's patch since the two conflict, and I assume that Rob's
> patch is going into 3.10.
> 
> c) Undo my local revert of "ARM: 7674/1: smp: Avoid dummy clockevent
> being preferred over real hardware clock-event".
> 

Ok. Good. That's close to what I have and works here. As well.

> ... then everything now works.
> 
> So the only remaining issues are:
> 
> 1) Should the mux clocks still be defined in the binding document?
> Prashant didn't seem to think so.
> 

I guess we should remove them then.

> 2) I need Mike's ack to apply this series to the Tegra tree.

Ok. Mike?

Cheers,

Peter.
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