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

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Date:	Tue, 20 Aug 2013 17:13:08 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	S??ren Brinkmann <soren.brinkmann@...inx.com>,
	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 08/20/2013 02:57 AM, Stephen Boyd wrote:
> 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.

Yes, that sounds a good idea.

  -- Daniel


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