Date: Mon, 19 Aug 2013 17:57:48 -0700
From: Stephen Boyd <sboyd@codeaurora.org>
To: S??ren Brinkmann <soren.brinkmann@xilinx.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>, srinivas.kandagatla@st.com,
        Russell King <linux@arm.linux.org.uk>,
        Michal Simek <michal.simek@xilinx.com>, linux-kernel@vger.kernel.org,
        Stuart Menefy <stuart.menefy@st.com>,
        John Stultz <john.stultz@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: Enable arm_global_timer for Zynq brakes boot
Message-ID: <20130820005748.GA23960@codeaurora.org>
References: <20130809172757.GD14845@codeaurora.org>
 <c1e112a3-cfed-4e53-951e-b1a9208d7dc8@TX2EHSMHS038.ehs.local>
 <52090B43.9090000@codeaurora.org>
 <d36fc2db-1189-4c6a-9bc4-0ac2e29eaa1b@AM1EHSMHS009.ehs.local>
 <5209120D.1010701@linaro.org>
 <9b07d8a3-b650-4147-b952-9bcfc1172c51@VA3EHSMHS025.ehs.local>
 <5209152F.5020307@linaro.org>
 <86b18b0d-08e1-4899-86ea-ed22d3d36dee@DB8EHSMHS028.ehs.local>
 <5212A394.5020109@codeaurora.org>
 <140fc91a-cc81-418e-8a5e-413bbf47834e@CO1EHSMHS025.ehs.local>
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On 08/19, S??ren Brinkmann wrote:
> Hi Stephen,
> 
> On Mon, Aug 19, 2013 at 04:00:36PM -0700, Stephen Boyd wrote:
> > On 08/16/13 10:28, S??ren Brinkmann wrote:
> > > On Mon, Aug 12, 2013 at 07:02:39PM +0200, Daniel Lezcano wrote:
> > >> On 08/12/2013 06:53 PM, S??ren Brinkmann wrote:
> > >>> It's actually present. I have a clean 3.11-rc3 and the only changes are
> > >>> my patch to enable the GT and Stephen's fix.
> > >>> The cpuidle stats show both idle states being used.
> > >> Ah, right. The tick_broadcast_mask is not set because the arm global
> > >> timer has not the CLOCK_EVT_FEAT_C3STOP feature flag set.
> > > Just to check in. Do you want any additional testing done? Or can I
> > > expect Stephens fix to get merged, so Zynq can use the GT?
> > >
> > 
> > I was curious, can you use just the first hunk of the patch that applied
> > to tick-broadcast.c to fix the problem? I think the answer is yes.
> 
> Yes, that seems to be enough.
> 

Great thank you. I will split the patch into two pieces. That way
we can discuss the merit of always using a timer that doesn't
suffer from FEAT_C3_STOP over a timer that does.

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