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SubjectRe: Enable arm_global_timer for Zynq brakes boot
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. 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

Tick Device: mode: 1
Per CPU device: 0
Clock Event Device: arm_global_timer
max_delta_ns: 12884902005
min_delta_ns: 1000
mult: 715827876
shift: 31
mode: 3
next_event: 24216749370 nsecs
set_next_event: gt_clockevent_set_next_event
set_mode: gt_clockevent_set_mode
event_handler: hrtimer_interrupt
retries: 0

Tick Device: mode: 1
Per CPU device: 1
Clock Event Device: arm_global_timer
max_delta_ns: 12884902005
min_delta_ns: 1000
mult: 715827876
shift: 31
mode: 3
next_event: 24220000000 nsecs
set_next_event: gt_clockevent_set_next_event
set_mode: gt_clockevent_set_mode
event_handler: hrtimer_interrupt
retries: 0


# cat /proc/interrupts
CPU0 CPU1
27: 1668 1640 GIC 27 gt
29: 0 0 GIC 29 twd
43: 0 0 GIC 43 ttc_clockevent
82: 536 0 GIC 82 xuartps
IPI0: 0 0 CPU wakeup interrupts
IPI1: 0 0 Timer broadcast interrupts
IPI2: 1264 1322 Rescheduling interrupts
IPI3: 0 0 Function call interrupts
IPI4: 24 70 Single function call interrupts
IPI5: 0 0 CPU stop interrupts
Err: 0


Thanks,
Sören


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