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  1. 13 Feb, 2017 2 commits
    • Grygorii Strashko's avatar
      PM / wakeirq: Fix spurious wake-up events for dedicated wakeirqs · 0bf0ee8e
      Grygorii Strashko authored 
      Dedicated wakeirq is a one time event to wake-up the system from
low-power state and then call pm_runtime_resume() on the device wired
with the dedicated wakeirq.

Sometimes dedicated wakeirqs can get deferred if they trigger after we
call disable_irq_nosync() in dev_pm_disable_wake_irq(). This can happen
if pm_runtime_get() is called around the same time a wakeirq fires.

If an interrupt fires after disable_irq_nosync(), by default it will get
tagged with IRQS_PENDING and will run later on when the interrupt is
enabled again.

Deferred wakeirqs usually just produce pointless wake-up events. But they
can also cause suspend to fail if the deferred wakeirq fires during
dpm_suspend_noirq() for example. So we really don't want to see the
deferred wakeirqs triggering after the device has resumed.

Let's fix the issue by setting IRQ_DISABLE_UNLAZY flag for the dedicated
wakeirqs. The other option would be to implement irq_disable() in the
dedicated wakeirq controller, but that's not a generic solution.

For reference below is what happens with a IRQ_TYPE_EDGE_BOTH IRQ
type wakeirq:

- resume by dedicated IRQ (EDGE_FALLING)
 - suspend_enter()
  ....
 - arch_suspend_enable_irqs()
   |- dedicated IRQ armed and fired
   |- irq_pm_check_wakeup()
      |- disarm, disable IRQ and mark as IRQS_PENDING
  ....
 - dpm_resume_noirq()
   |- resume_device_irqs()
      |- __enable_irq()
         |- check_irq_resend()
            |- handle_threaded_wake_irq()
 	       |- dedicated IRQ processed
   |- device_wakeup_disarm_wake_irqs()
      |- disable_irq_wake()
  ....
 !-> dedicated IRQ (EDGE_RISING)
     -| handle_edge_irq()
        |- IRQ disabled: mask_ack_irq and mark as IRQS_PENDING
  ....
- subsequent suspend
  ....
  |- dpm_suspend_noirq()
     |- device_wakeup_arm_wake_irqs()
        |- __enable_irq()
           |- check_irq_resend()
(a)           |- handle_threaded_wake_irq()
                 |- pm_wakeup_event() --> abort suspend
  ....
     |- suspend_device_irqs()
        |- suspend_device_irq()
           |-  dedicated IRQ armed
  ....
(b)  |- resend_irqs
        |- irq_pm_check_wakeup()
           |- IRQ armed -> abort suspend

because of pending IRQ System suspend can be aborted at points
(a)-not armed or (b)-armed.

Fixes: 4990d4fe (PM / Wakeirq: Add automated device wake IRQ handling)
Signed-off-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
[ tony@atomide.com: added a comment, updated the description ]
Tested-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      0bf0ee8e
    • Grygorii Strashko's avatar
      PM / wakeirq: Enable dedicated wakeirq for suspend · c8434559
      Grygorii Strashko authored 
      We currently rely on runtime PM to enable dedicated wakeirq for suspend.
This assumption fails in the following two cases:

1. If the consumer driver does not have runtime PM implemented, the
   dedicated wakeirq never gets enabled for suspend

2. If the consumer driver has runtime PM implemented, but does not idle
   in suspend

Let's fix the issue by always enabling the dedicated wakeirq during
suspend.

Depends-on: bed57030 (PM / wakeirq: Fix dedicated wakeirq for drivers not using autosuspend)
Fixes: 4990d4fe (PM / Wakeirq: Add automated device wake IRQ handling)
Reported-by: default avatarKeerthy <j-keerthy@ti.com>
Tested-by: default avatarKeerthy <j-keerthy@ti.com>
Signed-off-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
[ tony@atomide.com: updated based on bed57030, added description ]
Tested-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      c8434559
  3. 12 Feb, 2017 1 commit
  5. 11 Feb, 2017 8 commits
  7. 10 Feb, 2017 25 commits
  9. 09 Feb, 2017 4 commits
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