[Bug] ARM: mxs: STI: console can't wake up from freeze
stefan.wahren at i2se.com
Sun Nov 6 10:31:44 PST 2016
> Daniel Lezcano <daniel.lezcano at linaro.org> hat am 6. November 2016 um 15:55
> On 06/11/2016 11:20, Stefan Wahren wrote:
> > Hi,
> >> Russell King - ARM Linux <linux at armlinux.org.uk> hat am 5. November 2016 um
> >> 19:05 geschrieben:
> >> On Sat, Nov 05, 2016 at 04:28:37PM +0100, Stefan Wahren wrote:
> >>> As i wrote in my email before, i added a pr_info() into freeze_wake.
> >>> But i never see the output of this message. So i assume freeze_wake
> >>> is never called. Again, how could this happen?
> >> Hmm, so the bit that you're getting stuck on is:
> >> wait_event(suspend_freeze_wait_head,
> >> suspend_freeze_state == FREEZE_STATE_WAKE);
> > thanks for all the feedback. The real cause for this issue is in the irqchip
> > driver. I fixed it with this patch:
> Mind to give some details ?
No. AFAIK the serial_core already handles the suspend to idle. But it requires
that enable_irq_wake for the UART IRQ succeed. Unfortunately the irq-mxs (like a
couple of other irqchip drivers) neither implemented set_irq_wake or set
IRQCHIP_SKIP_SET_WAKE so enable_irq_wake will fail with -ENXIO and the UART
won't be setup as wakeup source. As the mxs interrupt controller doesn't provide
any facility to setup wakeup source i choose to use IRQCHIP_SKIP_SET_WAKE.
Instead of failing silently it would be better if sysfs won't allow to enable
wakeup source in this case or at least the serial core should complains about
More information about the linux-arm-kernel