[PATCH usb-next v10 3/8] usb: core: add a wrapper for the USB PHYs on the HCD
Chunfeng Yun
chunfeng.yun at mediatek.com
Thu Mar 22 20:19:41 PDT 2018
On Thu, 2018-03-22 at 14:41 +0200, Roger Quadros wrote:
> On 22/03/18 10:10, Chunfeng Yun wrote:
> > Hi,
> > On Wed, 2018-03-21 at 13:30 +0200, Roger Quadros wrote:
> >> Martin,
> >>
> >> On 21/03/18 00:01, Martin Blumenstingl wrote:
> >>> Hi Roger, Hi Chunfeng,
> >>>
> >>> On Tue, Mar 20, 2018 at 1:04 PM, Chunfeng Yun <chunfeng.yun at mediatek.com> wrote:
> >>>> Hi Martin & Roger:
> >>>>
> >>>> On Mon, 2018-03-19 at 17:12 +0100, Martin Blumenstingl wrote:
> >>>>> Hi Roger,
> >>>>>
> >>>>> On Mon, Mar 19, 2018 at 9:49 AM, Roger Quadros <rogerq at ti.com> wrote:
> >>>>>> Hi,
> >>>>>>
> >>>>>> On 19/03/18 00:29, Martin Blumenstingl wrote:
> >>>>>>> Hi Roger,
> >>>>>>>
> >>>>>>> On Fri, Mar 16, 2018 at 3:32 PM, Roger Quadros <rogerq at ti.com> wrote:
> >>>>>>>> +some TI folks
> >>>>>>>>
> >>>>>>>> Hi Martin,
> >>>>>>>>
> >>>>>>>> On 18/02/18 20:44, Martin Blumenstingl wrote:
> >>>>>>>>> Many SoC platforms have separate devices for the USB PHY which are
> >>>>>>>>> registered through the generic PHY framework. These PHYs have to be
> >>>>>>>>> enabled to make the USB controller actually work. They also have to be
> >>>>>>>>> disabled again on shutdown/suspend.
> >>>>>>>>>
> >>>>>>>>> Currently (at least) the following HCI platform drivers are using custom
> >>>>>>>>> code to obtain all PHYs via devicetree for the roothub/controller and
> >>>>>>>>> disable/enable them when required:
> >>>>>>>>> - ehci-platform.c has ehci_platform_power_{on,off}
> >>>>>>>>> - xhci-mtk.c has xhci_mtk_phy_{init,exit,power_on,power_off}
> >>>>>>>>> - ohci-platform.c has ohci_platform_power_{on,off}
> >>>>>>>>>
> >>>>>>>>> With this new wrapper the USB PHYs can be specified directly in the
> >>>>>>>>> USB controller's devicetree node (just like on the drivers listed
> >>>>>>>>> above). This allows SoCs like the Amlogic Meson GXL family to operate
> >>>>>>>>> correctly once this is wired up correctly. These SoCs use a dwc3
> >>>>>>>>> controller and require all USB PHYs to be initialized (if one of the USB
> >>>>>>>>> PHYs it not initialized then none of USB port works at all).
> >>>>>>>>>
> >>>>>>>>> Signed-off-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
> >>>>>>>>> Tested-by: Yixun Lan <yixun.lan at amlogic.com>
> >>>>>>>>> Cc: Neil Armstrong <narmstrong at baylibre.com>
> >>>>>>>>> Cc: Chunfeng Yun <chunfeng.yun at mediatek.com>
> >>>>>>>>
> >>>>>>>> This patch is breaking low power cases on TI SoCs when USB is in host mode.
> >>>>>>>> I'll explain why below.
> >>>>>>> based on your explanation and reading the TI PHY drivers I am assuming
> >>>>>>> that the affected SoCs are using the "phy-omap-usb2" driver
> >>>>>>>
> >>>>>> yes and phy-ti-pipe3 as well i.e. "ti,phy-usb3" and "ti,omap-usb3"
> >>>>> I missed that, thanks
> >>>>>
> >>>>>>>>> ---
> >>>>>>>>> drivers/usb/core/Makefile | 2 +-
> >>>>>>>>> drivers/usb/core/phy.c | 158 ++++++++++++++++++++++++++++++++++++++++++++++
> >>>>>>>>> drivers/usb/core/phy.h | 7 ++
> >>>>>>>>> 3 files changed, 166 insertions(+), 1 deletion(-)
> >>>>>>>>> create mode 100644 drivers/usb/core/phy.c
> >>>>>>>>> create mode 100644 drivers/usb/core/phy.h
> >>>>>>>>>
> >>>>>>>>> diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile
> >>>>>>>>> index 92c9cefb4317..18e874b0441e 100644
> >>>>>>>>> --- a/drivers/usb/core/Makefile
> >>>>>>>>> +++ b/drivers/usb/core/Makefile
> >>>>>>>>> @@ -6,7 +6,7 @@
> >>>>>>>>> usbcore-y := usb.o hub.o hcd.o urb.o message.o driver.o
> >>>>>>>>> usbcore-y += config.o file.o buffer.o sysfs.o endpoint.o
> >>>>>>>>> usbcore-y += devio.o notify.o generic.o quirks.o devices.o
> >>>>>>>>> -usbcore-y += port.o
> >>>>>>>>> +usbcore-y += phy.o port.o
> >>>>>>>>>
> >>>>>>>>> usbcore-$(CONFIG_OF) += of.o
> >>>>>>>>> usbcore-$(CONFIG_USB_PCI) += hcd-pci.o
> >>>>>>>>> diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c
> >>>>>>>>> new file mode 100644
> >>>>>>>>> index 000000000000..09b7c43c0ea4
> >>>>>>>>> --- /dev/null
> >>>>>>>>> +++ b/drivers/usb/core/phy.c
> >>>>>>>>> @@ -0,0 +1,158 @@
> >>>>>>>>> +// SPDX-License-Identifier: GPL-2.0+
> >>>>>>>>> +/*
> >>>>>>>>> + * A wrapper for multiple PHYs which passes all phy_* function calls to
> >>>>>>>>> + * multiple (actual) PHY devices. This is comes handy when initializing
> >>>>>>>>> + * all PHYs on a HCD and to keep them all in the same state.
> >>>>>>>>> + *
> >>>>>>>>> + * Copyright (C) 2018 Martin Blumenstingl <martin.blumenstingl at googlemail.com>
> >>>>>>>>> + */
> >>>>>>>>> +
> >>>>>>>>> +#include <linux/device.h>
> >>>>>>>>> +#include <linux/list.h>
> >>>>>>>>> +#include <linux/phy/phy.h>
> >>>>>>>>> +#include <linux/of.h>
> >>>>>>>>> +
> >>>>>>>>> +#include "phy.h"
> >>>>>>>>> +
> >>>>>>>>> +struct usb_phy_roothub {
> >>>>>>>>> + struct phy *phy;
> >>>>>>>>> + struct list_head list;
> >>>>>>>>> +};
> >>>>>>>>> +
> >>>>>>>>> +static struct usb_phy_roothub *usb_phy_roothub_alloc(struct device *dev)
> >>>>>>>>> +{
> >>>>>>>>> + struct usb_phy_roothub *roothub_entry;
> >>>>>>>>> +
> >>>>>>>>> + roothub_entry = devm_kzalloc(dev, sizeof(*roothub_entry), GFP_KERNEL);
> >>>>>>>>> + if (!roothub_entry)
> >>>>>>>>> + return ERR_PTR(-ENOMEM);
> >>>>>>>>> +
> >>>>>>>>> + INIT_LIST_HEAD(&roothub_entry->list);
> >>>>>>>>> +
> >>>>>>>>> + return roothub_entry;
> >>>>>>>>> +}
> >>>>>>>>> +
> >>>>>>>>> +static int usb_phy_roothub_add_phy(struct device *dev, int index,
> >>>>>>>>> + struct list_head *list)
> >>>>>>>>> +{
> >>>>>>>>> + struct usb_phy_roothub *roothub_entry;
> >>>>>>>>> + struct phy *phy = devm_of_phy_get_by_index(dev, dev->of_node, index);
> >>>>>>>>> +
> >>>>>>>>> + if (IS_ERR_OR_NULL(phy)) {
> >>>>>>>>> + if (!phy || PTR_ERR(phy) == -ENODEV)
> >>>>>>>>> + return 0;
> >>>>>>>>> + else
> >>>>>>>>> + return PTR_ERR(phy);
> >>>>>>>>> + }
> >>>>>>>>> +
> >>>>>>>>> + roothub_entry = usb_phy_roothub_alloc(dev);
> >>>>>>>>> + if (IS_ERR(roothub_entry))
> >>>>>>>>> + return PTR_ERR(roothub_entry);
> >>>>>>>>> +
> >>>>>>>>> + roothub_entry->phy = phy;
> >>>>>>>>> +
> >>>>>>>>> + list_add_tail(&roothub_entry->list, list);
> >>>>>>>>> +
> >>>>>>>>> + return 0;
> >>>>>>>>> +}
> >>>>>>>>> +
> >>>>>>>>> +struct usb_phy_roothub *usb_phy_roothub_init(struct device *dev)
> >>>>>>>>> +{
> >>>>>>>>> + struct usb_phy_roothub *phy_roothub;
> >>>>>>>>> + struct usb_phy_roothub *roothub_entry;
> >>>>>>>>> + struct list_head *head;
> >>>>>>>>> + int i, num_phys, err;
> >>>>>>>>> +
> >>>>>>>>> + num_phys = of_count_phandle_with_args(dev->of_node, "phys",
> >>>>>>>>> + "#phy-cells");
> >>>>>>>>> + if (num_phys <= 0)
> >>>>>>>>> + return NULL;
> >>>>>>>>> +
> >>>>>>>>> + phy_roothub = usb_phy_roothub_alloc(dev);
> >>>>>>>>> + if (IS_ERR(phy_roothub))
> >>>>>>>>> + return phy_roothub;
> >>>>>>>>> +
> >>>>>>>>> + for (i = 0; i < num_phys; i++) {
> >>>>>>>>> + err = usb_phy_roothub_add_phy(dev, i, &phy_roothub->list);
> >>>>>>>>> + if (err)
> >>>>>>>>> + goto err_out;
> >>>>>>>>> + }
> >>>>>>>>> +
> >>>>>>>>> + head = &phy_roothub->list;
> >>>>>>>>> +
> >>>>>>>>> + list_for_each_entry(roothub_entry, head, list) {
> >>>>>>>>> + err = phy_init(roothub_entry->phy);
> >>>>>>>>
> >>>>>>>> The phy_init() function actually enables the PHY clocks.
> >>>>>>>> It should be moved to the usb_phy_roothub_exit() routine just before calling phy_power_on().
> >>>>>>> do you mean that phy_init should be moved to usb_phy_roothub_power_on
> >>>>>>> (just before phy_power_on is called within usb_phy_roothub_power_on)?
> >>>>>>>
> >>>>>>
> >>>>>> Yes.
> >>>>>>
> >>>>>>> an earlier version of my patch did exactly this, but it caused
> >>>>>>> problems during a suspend/resume cycle on Mediatek devices
> >>>>>>> Chunfeng Yun reported that issue here [0], quote from that mail for
> >>>>>>> easier reading:
> >>>>>>> "In order to keep link state on mt8173, we just power off all phys(not
> >>>>>>> exit) when system enter suspend, then power on them again (needn't
> >>>>>>> init, otherwise device will be disconnected) when system resume, this
> >>>>>>> can avoid re-enumerating device."
> >>>>>>>
> >>>>>>>>> + if (err)
> >>>>>>>>> + goto err_exit_phys;
> >>>>>>>>> + }
> >>>>>>>>> +
> >>>>>>>>> + return phy_roothub;
> >>>>>>>>> +
> >>>>>>>>> +err_exit_phys:
> >>>>>>>>> + list_for_each_entry_continue_reverse(roothub_entry, head, list)
> >>>>>>>>> + phy_exit(roothub_entry->phy);
> >>>>>>>>> +
> >>>>>>>>> +err_out:
> >>>>>>>>> + return ERR_PTR(err);
> >>>>>>>>> +}
> >>>>>>>>> +EXPORT_SYMBOL_GPL(usb_phy_roothub_init);
> >>>>>>>>> +
> >>>>>>>>> +int usb_phy_roothub_exit(struct usb_phy_roothub *phy_roothub)
> >>>>>>>>> +{
> >>>>>>>>> + struct usb_phy_roothub *roothub_entry;
> >>>>>>>>> + struct list_head *head;
> >>>>>>>>> + int err, ret = 0;
> >>>>>>>>> +
> >>>>>>>>> + if (!phy_roothub)
> >>>>>>>>> + return 0;
> >>>>>>>>> +
> >>>>>>>>> + head = &phy_roothub->list;
> >>>>>>>>> +
> >>>>>>>>> + list_for_each_entry(roothub_entry, head, list) {
> >>>>>>>>> + err = phy_exit(roothub_entry->phy);
> >>>>>>>>> + if (err)
> >>>>>>>>> + ret = ret;
> >>>>>>>>> + }
> >>>>>>>>
> >>>>>>>> phy_exit() should be moved to usb_phy_roothub_poweroff() just after calling phy_power_off().
> >>>>>>> if I understood Chunfeng Yun correctly this will require
> >>>>>>> re-enumeration of the USB devices after a suspend/resume cycle on
> >>>>>>> Mediatek SoCs
> >>>>>>>
> >>>>>>
> >>>>>> OK. I suppose that there are 2 cases
> >>>>>> 1) Mediatek's case: USB controller context retained across suspend/resume.
> >>>>>> Remote wakeup probably required.
> >>>>>> No re-enumeration preferred after resume. phy_exit()/phy_init() must not be called
> >>>>>> during suspend/resume to keep PHY link active.
> >>>>> Documentation/devicetree/bindings/usb/mediatek,mtu3.txt indeed shows
> >>>>> that the parent of the USB controller can be marked as "wakeup-source"
> >>>>>
> >>>>>> 2) TI's case: low power important: USB context is lost, OK to re-enumerate.
> >>>>>> phy_exit()/phy_init() must be called during suspend/resume.
> >>>>> ACK
> >>>>>
> >>>>>>>> With that there is nothing else being done here. Shouldn't we be doing the equivalent of
> >>>>>>>> usb_phy_roothub_del_phy() and usb_phy_roothub_free() here?
> >>>>>>>>
> >>>>>>>>> +
> >>>>>>>>> + return ret;
> >>>>>>>>> +}
> >>>>>>>>> +EXPORT_SYMBOL_GPL(usb_phy_roothub_exit);
> >>>>>>>>> +
> >>>>>>>>> +int usb_phy_roothub_power_on(struct usb_phy_roothub *phy_roothub)
> >>>>>>>>> +{
> >>>>>>>>> + struct usb_phy_roothub *roothub_entry;
> >>>>>>>>> + struct list_head *head;
> >>>>>>>>> + int err;
> >>>>>>>>> +
> >>>>>>>>> + if (!phy_roothub)
> >>>>>>>>> + return 0;
> >>>>>>>>> +
> >>>>>>>>> + head = &phy_roothub->list;
> >>>>>>>>> +
> >>>>>>>>> + list_for_each_entry(roothub_entry, head, list) {
> >>>>>>>>> + err = phy_power_on(roothub_entry->phy);
> >>>>>>>>> + if (err)
> >>>>>>>>> + goto err_out;
> >>>>>>>>> + }
> >>>>>>>>> +
> >>>>>>>>> + return 0;
> >>>>>>>>> +
> >>>>>>>>> +err_out:
> >>>>>>>>> + list_for_each_entry_continue_reverse(roothub_entry, head, list)
> >>>>>>>>> + phy_power_off(roothub_entry->phy);
> >>>>>>>>> +
> >>>>>>>>> + return err;
> >>>>>>>>> +}
> >>>>>>>>> +EXPORT_SYMBOL_GPL(usb_phy_roothub_power_on);
> >>>>>>>>> +
> >>>>>>>>> +void usb_phy_roothub_power_off(struct usb_phy_roothub *phy_roothub)
> >>>>>>>>> +{
> >>>>>>>>> + struct usb_phy_roothub *roothub_entry;
> >>>>>>>>> +
> >>>>>>>>> + if (!phy_roothub)
> >>>>>>>>> + return;
> >>>>>>>>> +
> >>>>>>>>> + list_for_each_entry_reverse(roothub_entry, &phy_roothub->list, list)
> >>>>>>>>> + phy_power_off(roothub_entry->phy);
> >>>>>>>>
> >>>>>>>> Not doing the phy_exit() here leaves the clocks enabled on our SoC and
> >>>>>>>> we're no longer able to reach low power states on system suspend.
> >>>>>>> I'm not sure where this problem should be solved:
> >>>>>>> - set skip_phy_initialization in struct usb_hcd to 1 for the affected
> >>>>>>> TI platforms
> >>>>>>
> >>>>>> Many TI platforms are affected, omap5*, dra7*, am43*
> >>>>>>
> >>>>>>> - fix this in the usb_phy_roothub code
> >>>>>>
> >>>>>> I'd vote for fixing it in the usb_phy_roothub code. How?
> >>>>>> How about using the device_can_wakeup() to decide if we should call phy_exit()/init() or not?
> >>>>>> If the USB device can't wakeup the system there is no point in keeping it powered/clocked right?
> >>>>> @Chunfeng: can you confirm Roger's idea that we could call phy_exit if
> >>>>> the controller is *NOT* marked as "wakeup-source"?
> >>>>> I am also not sure if it would work, since the "wakeup-source"
> >>>>> property is defined on the USB controller's parent node in case of the
> >>>>> Mediatek MTU3 (Mediatek USB3.0 DRD) controller
> >>>>>
> >>>> Very sorry, I forgot that MTU3 & xHCI drivers always set them as wakeup
> >>>> devices by device_init_wakeup(dev, true),but not dependent on
> >>>> "wakeup-source" property, so maybe we can use device_can_wakeup() to
> >>>> decide whether call phy_exit()/init() or not.
> >>> the 64-bit Amlogic Meson GXL/GXM SoCs don't support suspend/resume
> >>> yet, so I cannot test this
> >>> based on this suggestion I threw up two patches which are *compile
> >>> tested only* based on Greg's usb-next branch
> >>> you can find them here: [0] (as well as attached to this mail)
> >>>
> >>> @Chunfeng: can you please test this on one of your Mediatek SoCs?
> >>> @Roger: can you please test this on a TI SoC?
> >>>
> >>> (apologies in advance if these patches don't work)
> >>>
> >>> please note that I won't have access to my computer until Saturday.
> >>> if these patches need to be rewritten/replaced/etc. then feel free to
> >>> send your own version to the list
> >>
> >> Had to do the following to build
> >>
> >> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> >> index 6d4a419..2884607 100644
> >> --- a/drivers/usb/core/hcd.c
> >> +++ b/drivers/usb/core/hcd.c
> >> @@ -2262,7 +2262,7 @@ int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
> >> hcd->state = HC_STATE_SUSPENDED;
> >>
> >> if (!PMSG_IS_AUTO(msg))
> >> - usb_phy_roothub_suspend(hcd->phy_roothub);
> >> + usb_phy_roothub_suspend(&rhdev->dev, hcd->phy_roothub);
> >
> > Try to use hcd->self.controller instead of &rhdev->dev;
>
> Actually it should be hcd->self.sysdev.
I find that xhci-plat.c enables wakeup by hcd->self.controller which is
different from hcd->self.sysdev sometimes.
And hcd->self.controller is the same as hcd->self.sysdev on MTK's
platform.
> >
> >>
> >> /* Did we race with a root-hub wakeup event? */
> >> if (rhdev->do_remote_wakeup) {
> >> @@ -2302,7 +2302,7 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
> >> }
> >>
> >> if (!PMSG_IS_AUTO(msg)) {
> >> - status = usb_phy_roothub_resume(hcd->phy_roothub);
> >> + status = usb_phy_roothub_resume(&rhdev->dev, hcd->phy_roothub);
> > ditto
> >> if (status)
> >> return status;
> >> }
> >> @@ -2344,7 +2344,7 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
> >> }
> >> } else {
> >> hcd->state = old_state;
> >> - usb_phy_roothub_suspend(hcd->phy_roothub);
> >> + usb_phy_roothub_suspend(&rhdev->dev, hcd->phy_roothub);
> > ditto
> >> dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
> >> "resume", status);
> >> if (status != -ESHUTDOWN)
> >>
> >>
> >> And the following to fix runtime issues
> >>
> >> diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c
> >> index 2eca371..8598906 100644
> >> --- a/drivers/usb/core/phy.c
> >> +++ b/drivers/usb/core/phy.c
> >> @@ -32,9 +32,9 @@ static int usb_phy_roothub_add_phy(struct device *dev, int index,
> >> return PTR_ERR(phy);
> >> }
> >>
> >> - roothub_entry = usb_phy_roothub_alloc(dev);
> >> - if (IS_ERR(roothub_entry))
> >> - return PTR_ERR(roothub_entry);
> >> + roothub_entry = devm_kzalloc(dev, sizeof(*roothub_entry), GFP_KERNEL);
> >> + if (!roothub_entry)
> >> + return -ENOMEM;
> >>
> >> roothub_entry->phy = phy;
> >>
> >> @@ -162,7 +162,7 @@ int usb_phy_roothub_suspend(struct device *dev,
> >> usb_phy_roothub_power_off(phy_roothub);
> >>
> >> /* keep the PHYs initialized so the device can wake up the system */
> >> - if (device_can_wakeup(dev))
> >> + if (device_may_wakeup(dev))
> > It's ok
>
> I had to additionally fix usb_phy_roothub_resume() from
> if (device_can_wakeup(dev))
> to
> if (!device_may_wakeup(dev))
>
> >> return 0;
> >>
> >> return usb_phy_roothub_exit(phy_roothub);
> >>
> >>
> >> Here are my obervations
> >> - if wakeup is disabled it works fine as expected, phy_exit() is called and I'm able to reach
> >> low power states.
> >>
> >> - if wakeup is enabled (/sys/bus/usb/device/usb2/power/wakeup), then hcd_bus_suspend() is never called
> >> and so phy_power_off won't be called either.
> >>
> >> This means that the device_may_wakeup() check is redundant. Sorry for suggesting this.
> > You maybe use a wrong device.
>
> Yes, after using the correct device I don't see the problem.
>
> Can you please try the below patch on top of the 2 Patches that Martin sent and the new patch you sent?
> Once you confirm it works for you I can send the 2 patches officially.
It works on MTK's platform, I'll test it again when official patches are
sent out.
Thanks a lot
>
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 6d4a419..04cc453 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -2262,7 +2262,7 @@ int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
> hcd->state = HC_STATE_SUSPENDED;
>
> if (!PMSG_IS_AUTO(msg))
> - usb_phy_roothub_suspend(hcd->phy_roothub);
> + usb_phy_roothub_suspend(hcd->self.sysdev, hcd->phy_roothub);
>
> /* Did we race with a root-hub wakeup event? */
> if (rhdev->do_remote_wakeup) {
> @@ -2302,7 +2302,7 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
> }
>
> if (!PMSG_IS_AUTO(msg)) {
> - status = usb_phy_roothub_resume(hcd->phy_roothub);
> + status = usb_phy_roothub_resume(hcd->self.sysdev, hcd->phy_roothub);
> if (status)
> return status;
> }
> @@ -2344,7 +2344,7 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
> }
> } else {
> hcd->state = old_state;
> - usb_phy_roothub_suspend(hcd->phy_roothub);
> + usb_phy_roothub_suspend(hcd->self.sysdev, hcd->phy_roothub);
> dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
> "resume", status);
> if (status != -ESHUTDOWN)
> diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c
> index 2eca371..25fe729 100644
> --- a/drivers/usb/core/phy.c
> +++ b/drivers/usb/core/phy.c
> @@ -32,9 +32,9 @@ static int usb_phy_roothub_add_phy(struct device *dev, int index,
> return PTR_ERR(phy);
> }
>
> - roothub_entry = usb_phy_roothub_alloc(dev);
> - if (IS_ERR(roothub_entry))
> - return PTR_ERR(roothub_entry);
> + roothub_entry = devm_kzalloc(dev, sizeof(*roothub_entry), GFP_KERNEL);
> + if (!roothub_entry)
> + return -ENOMEM;
>
> roothub_entry->phy = phy;
>
> @@ -162,7 +162,7 @@ int usb_phy_roothub_suspend(struct device *dev,
> usb_phy_roothub_power_off(phy_roothub);
>
> /* keep the PHYs initialized so the device can wake up the system */
> - if (device_can_wakeup(dev))
> + if (device_may_wakeup(dev))
> return 0;
>
> return usb_phy_roothub_exit(phy_roothub);
> @@ -175,7 +175,7 @@ int usb_phy_roothub_resume(struct device *dev,
> int err;
>
> /* if the device can't wake up the system _exit was called */
> - if (device_can_wakeup(dev)) {
> + if (!device_may_wakeup(dev)) {
> err = usb_phy_roothub_init(phy_roothub);
> if (err)
> return err;
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