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SubjectRe: Enable arm_global_timer for Zynq brakes boot
On 08/12/2013 06:32 PM, Sören Brinkmann wrote:
> On Mon, Aug 12, 2013 at 09:20:19AM -0700, Stephen Boyd wrote:
>> On 08/12/13 09:03, 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:
>>
>> Sorry it had a bug depending on the registration order. Can you try this
>> one (tabs are probably spaces, sorry)? I will go read through this
>> thread to see if we already covered the registration order.
>
> That did it! Booted straight into the system.

Good news :)

> The broadcast device is
> the TTC instead of GT, now.
>
> Tick Device: mode: 1
> Broadcast device
> Clock Event Device: ttc_clockevent
> max_delta_ns: 1207932479
> min_delta_ns: 18432
> mult: 233015
> shift: 32
> mode: 1
> next_event: 9223372036854775807 nsecs
> set_next_event: ttc_set_next_event
> set_mode: ttc_set_mode
> event_handler: tick_handle_oneshot_broadcast
> retries: 0
>
> tick_broadcast_mask: 00000000
> tick_broadcast_oneshot_mask: 00000000

At the first glance, the timer broadcast usage is not set, right ? Can
you try with the cpuidle flag even if it is not needed ?

Thanks
-- Daniel


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