linux-kernel - Re: Enable arm_global_timer for Zynq brakes boot

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Message-ID: <ca0a49c2-37c8-4ff8-bc02-22158633d469@TX2EHSMHS012.ehs.local>
Date:	Mon, 12 Aug 2013 09:17:28 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
CC:	Stephen Boyd <sboyd@...eaurora.org>, <srinivas.kandagatla@...com>,
	Russell King <linux@....linux.org.uk>,
	Michal Simek <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>,
	Stuart Menefy <stuart.menefy@...com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Enable arm_global_timer for Zynq brakes boot

On Mon, Aug 12, 2013 at 06:08:46PM +0200, Daniel Lezcano wrote:
> On 08/12/2013 06:03 PM, Sören Brinkmann wrote:
> > On Fri, Aug 09, 2013 at 10:27:57AM -0700, Stephen Boyd wrote:
> >> On 08/09, Daniel Lezcano wrote:
> >>>
> >>> yes, but at least the broadcast mechanism should send an IPI to cpu0 to
> >>> wake it up, no ? As Stephen stated this kind of configuration should has
> >>> never been tested before so the tick broadcast code is not handling this
> >>> case properly IMHO.
> >>>
> >>
> >> If you have a per-cpu tick device that isn't suffering from
> >> FEAT_C3_STOP why wouldn't you use that for the tick versus a
> >> per-cpu tick device that has FEAT_C3_STOP? It sounds like there
> >> is a bug in the preference logic or you should boost the rating
> >> of the arm global timer above the twd. Does this patch help? It
> >> should make the arm global timer the tick device and whatever the
> >> cadence timer you have into the broadcast device.
> > 
> > I finally got to test your patch. Unfortunately, it makes the system
> > hang even earlier:
> 
> [ ... ]
> 
> Can you boot with maxcpus=1 and then give the result of timer_list ?

That doesn't seem to help anymore. It hangs too. Same picture w/ and w/o
'maxcpus', except for
	[    0.000000] Kernel command line: console=ttyPS0,115200 earlyprintk maxcpus=1


	Sören


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