Patch "ARM: dts: Fix omap4 hang with GPS connected to USB by using wakeupgen" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

ARM: dts: Fix omap4 hang with GPS connected to USB by using wakeupgen

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
arm-dts-fix-omap4-hang-with-gps-connected-to-usb-by-using-wakeupgen.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Tony Lindgren <[email protected]>
Date: Fri, 17 Nov 2017 08:56:58 -0800
Subject: ARM: dts: Fix omap4 hang with GPS connected to USB by using wakeupgen

From: Tony Lindgren <[email protected]>

[ 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.

---
 arch/arm/boot/dts/omap4.dtsi |    2 --
 1 file changed, 2 deletions(-)

@@ -861,14 +861,12 @@
 			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>;
 			};
 		};

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/arm-dts-fix-elm-interrupt-compiler-warning.patch queue-4.14/arm-omap2-fix-sram-virt-to-phys-translation-for-save_secure_ram_context.patch queue-4.14/arm-dts-fix-omap4-hang-with-gps-connected-to-usb-by-using-wakeupgen.patch queue-4.14/arm-dts-logicpd-som-lv-fix-gpmc-addresses-for-nand-and-enet.patch queue-4.14/arm-am33xx-prm-remove-am33xx_pwrdm_read_prev_pwrst-function.patch queue-4.14/arm-dts-logicpd-somlv-fix-wl127x-pinmux.patch queue-4.14/arm-dts-am4372-correct-the-interrupts_properties-of-mcasp.patch queue-4.14/arm-dts-am437x-cm-t43-correct-the-dmas-property-of-spi0.patch