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    Subject[PATCH AUTOSEL for 4.4 04/36] ARM: dts: Fix omap4 hang with GPS connected to USB by using wakeupgen
    Date
    From: Tony Lindgren <tony@atomide.com>

    [ Upstream commit cf87634c8b24e24bf379b8c6807c8b0fb5f23567 ]

    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@ti.com>
    Cc: Nishanth Menon <nm@ti.com>
    Cc: Marc Zyngier <marc.zyngier@arm.com>
    Cc: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
    Reviewed-by: Roger Quadros <rogerq@ti.com>
    Signed-off-by: Tony Lindgren <tony@atomide.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    ---
    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
    index 5a206c100ce2..8a5628c4b135 100644
    --- a/arch/arm/boot/dts/omap4.dtsi
    +++ b/arch/arm/boot/dts/omap4.dtsi
    @@ -844,14 +844,12 @@
    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>;
    };
    };
    --
    2.11.0
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