Hi, This series implements suspend/resume for the OMAP EHCI host controller during runtime idle. This will cause its parent, the OMAP USB Host Module as well as the USB TLL Module to be put in suspend and hence allow the USB power domain to be put in a lower power state. Then we no longer prevent the rest of the OMAP SoC from entering lower power states like RETention or OFF mode when USB (or system) is suspended. This was one of the main reason why EHCI_OMAP is still not enabled in OMAP2 defconfig. In order for remote wakeup or hub events (connect/disconnect) to be detected while in suspend, we need to rely on the IO daisy chaining mechanism on OMAP. This is nothing but configuring a pin to be wakeup capable and triggering an interrupt on any pin activity while the hardware module or the entire SoC is in sleep state. For this to work, we rely on the wakeup feature added to the omap-pinctrl-single driver in [1]. This takes care of routing IO pad wakeup interrupt to the right driver's interrupt handler (i.e. ehci_irq in our case). The pin state information for DEFAULT and IDLE is specified for the omap3beagle-xm board in patch 2. So this is tested only on omap3beagle-xm board. Patch 4 takes care of switching the pin states between DEFAULT and IDLE during idle/active mode using the pinctrl framework. Patch 5 takes care of handling the wakeup IRQ when the USB controller is suspended and Hardware is not accessible. Patch 6 implements runtime and system suspend/resume for the OMAP EHCI controller Changelog: v1: - addressed review comments on RFC patchset - Special case handling of controllers that can generate wakeup IRQ when suspended is done in HCD core instead of ehci-hcd. - Patches based on linus/master commit 496322bc91e35007ed754184dcd447a02b6dd685 with the following patches on top [1] - OMAP pinctrl wakeup support http://thread.gmane.org/gmane.linux.ports.arm.omap/99010/focus=99041 This does not apply cleanly though. Tony has agreed to post a revision anytime soon. [2] - [PATCH v5 0/2] ARM: dts: Add USB host support for Beagle-xm http://thread.gmane.org/gmane.linux.drivers.devicetree/39291 [3] - USB-EHCI-Fix-resume-signalling-on-remote-wakeup.patch http://thread.gmane.org/gmane.linux.usb.general/89608 cheers, -roger --- Roger Quadros (6): ARM: OMAP3: Enable Hardware Save and Restore for USB Host ARM: dts: omap3beagle-xm: Add idle state pins for USB host mfd: omap-usb-host: move initialization to module_init() mfd: omap-usb-host: Put pins in IDLE state on suspend USB: Support wakeup IRQ for suspended controllers USB: ehci-omap: Implement suspend/resume arch/arm/boot/dts/omap3-beagle-xm.dts | 29 ++++++++++--- arch/arm/mach-omap2/powerdomains3xxx_data.c | 8 +--- drivers/mfd/omap-usb-host.c | 45 ++++++++++-------- drivers/mfd/omap-usb-tll.c | 20 +-------- drivers/usb/core/hcd.c | 21 ++++++++- drivers/usb/host/ehci-omap.c | 64 ++++++++++++++++++++++++++- include/linux/usb/hcd.h | 3 + 7 files changed, 136 insertions(+), 54 deletions(-) -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
