Adding Tero to Cc also.
* Tony Lindgren <tony@xxxxxxxxxxx> [171117 16:59]:
> There's been a reproducable USB OHCI/EHCI cpuidle related hang on omap4
> for a while that happens after about 20 - 40 minutes on an idle system
> with some data feeding device being connected, like a USB GPS device or
> a cellular modem.
>
> This issue happens in cpuidle states C2 and C3 and does not happen if
> cpuidle is limited to C1 state only. The symptoms are that the whole
> system hangs and never wakes up from idle, and if a watchdog is
> configured the system reboots after a while.
>
> Turns out that OHCI/EHCI devices on omap4 are trying to use the GIC
> interrupt controller directly as a parent instead of the WUGEN. We
> need to pass the interrupts through WUGEN to GIC to provide the wakeup
> events for the processor.
>
> Let's fix the issue by removing the gic interrupt-parent and use the
> default interrupt-parent wakeupgen instead. Note that omap5.dtsi had
> this already fixes earlier by commit 7136d457f365 ("ARM: omap: convert
> wakeupgen to stacked domains") but we somehow missed omap4 at that
> point.
>
> Fixes: 7136d457f365 ("ARM: omap: convert wakeupgen to stacked domains")
> Cc: Dave Gerlach <d-gerlach@xxxxxx>
> Cc: Nishanth Menon <nm@xxxxxx>
> Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
> Cc: Roger Quadros <rogerq@xxxxxx>
> Cc: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> arch/arm/boot/dts/omap4.dtsi | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi
> --- a/arch/arm/boot/dts/omap4.dtsi
> +++ b/arch/arm/boot/dts/omap4.dtsi
> @@ -1081,14 +1081,12 @@
> usbhsohci: ohci@4a064800 {
> compatible = "ti,ohci-omap3";
> reg = <0x4a064800 0x400>;
> - interrupt-parent = <&gic>;
> interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>;
> };
>
> usbhsehci: ehci@4a064c00 {
> compatible = "ti,ehci-omap";
> reg = <0x4a064c00 0x400>;
> - interrupt-parent = <&gic>;
> interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
> };
> };
> --
> 2.15.0
> --
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