From: Alan Stern <stern@rowland.harvard.edu> To: Ravi Chandra Sadineni <ravisadineni@chromium.org> Cc: gregkh@linuxfoundation.org, <martin.blumenstingl@googlemail.com>, <ravisadineni@google.com>, <chunfeng.yun@mediatek.com>, <johan@kernel.org>, <arvind.yadav.cs@gmail.com>, <dtor@google.com>, <anton.bondarenko.sama@gmail.com>, <f.fainelli@gmail.com>, <keescook@chromium.org>, <mathias.nyman@linux.intel.com>, <felipe.balbi@linux.intel.com>, <ekorenevsky@gmail.com>, <peter.chen@nxp.com>, <joe@perches.com>, <tbroch@google.com>, <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <rajatja@google.com>, <bleung@google.com> Subject: Re: [PATCH V2] USB: Increment wakeup count on remote wakeup. Date: Fri, 20 Apr 2018 10:12:52 -0400 (EDT) [thread overview] Message-ID: <Pine.LNX.4.44L0.1804201010110.1407-100000@iolanthe.rowland.org> (raw) In-Reply-To: <20180420002752.181261-1-ravisadineni@chromium.org> On Thu, 19 Apr 2018, Ravi Chandra Sadineni wrote: > On chromebooks we depend on wakeup count to identify the wakeup source. > But currently USB devices do not increment the wakeup count when they > trigger the remote wake. This patch addresses the same. > > Resume condition is reported differently on USB 2.0 and USB 3.0 devices. > > On USB 2.0 devices, a wake capable device, if wake enabled, drives > resume signal to indicate a remote wake (USB 2.0 spec section 7.1.7.7). > The upstream facing port then sets C_PORT_SUSPEND bit and reports a > port change event (USB 2.0 spec section 11.24.2.7.2.3). Thus if a port > has resumed before driving the resume signal from the host and > C_PORT_SUSPEND is set, then the device attached to the given port might > be the reason for the last system wakeup. Increment the wakeup count for > the same. > > On USB 3.0 devices, a function may signal that it wants to exit from device > suspend by sending a Function Wake Device Notification to the host (USB3.0 > spec section 8.5.6.4) Thus on receiving the Function Wake, increment the > wakeup count. > > Signed-off-by: Ravi Chandra Sadineni <ravisadineni@chromium.org> > --- > drivers/usb/core/hcd.c | 2 ++ > drivers/usb/core/hub.c | 10 +++++++++- > 2 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c > index 777036ae63674..ee0f3ec57ce49 100644 > --- a/drivers/usb/core/hcd.c > +++ b/drivers/usb/core/hcd.c > @@ -2374,7 +2374,9 @@ static void hcd_resume_work(struct work_struct *work) > void usb_hcd_resume_root_hub (struct usb_hcd *hcd) > { > unsigned long flags; > + struct device *dev = &hcd->self.root_hub->dev; > > + pm_wakeup_event(dev, 0); > spin_lock_irqsave (&hcd_root_hub_lock, flags); > if (hcd->rh_registered) { > set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags); In general, hcd->self.root_hub is guaranteed to be non-NULL only when hcd->rh_registered is set. Therefore the assignment to dev and the call to pm_wakeup_event() should be moved within this "if" statement. The rest of the patch looks okay. Alan Stern > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c > index f6ea16e9f6bb9..aa9968d90a48c 100644 > --- a/drivers/usb/core/hub.c > +++ b/drivers/usb/core/hub.c > @@ -653,12 +653,17 @@ void usb_wakeup_notification(struct usb_device *hdev, > unsigned int portnum) > { > struct usb_hub *hub; > + struct usb_port *port_dev; > > if (!hdev) > return; > > hub = usb_hub_to_struct_hub(hdev); > if (hub) { > + port_dev = hub->ports[portnum - 1]; > + if (port_dev && port_dev->child) > + pm_wakeup_event(&port_dev->child->dev, 0); > + > set_bit(portnum, hub->wakeup_bits); > kick_hub_wq(hub); > } > @@ -3434,8 +3439,11 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg) > > /* Skip the initial Clear-Suspend step for a remote wakeup */ > status = hub_port_status(hub, port1, &portstatus, &portchange); > - if (status == 0 && !port_is_suspended(hub, portstatus)) > + if (status == 0 && !port_is_suspended(hub, portstatus)) { > + if (portchange & USB_PORT_STAT_C_SUSPEND) > + pm_wakeup_event(&udev->dev, 0); > goto SuspendCleared; > + } > > /* see 7.1.7.7; affects power usage, but not budgeting */ > if (hub_is_superspeed(hub->hdev)) >
WARNING: multiple messages have this Message-ID (diff)
From: Alan Stern <stern@rowland.harvard.edu> To: Ravi Chandra Sadineni <ravisadineni@chromium.org> Cc: gregkh@linuxfoundation.org, martin.blumenstingl@googlemail.com, ravisadineni@google.com, chunfeng.yun@mediatek.com, johan@kernel.org, arvind.yadav.cs@gmail.com, dtor@google.com, anton.bondarenko.sama@gmail.com, f.fainelli@gmail.com, keescook@chromium.org, mathias.nyman@linux.intel.com, felipe.balbi@linux.intel.com, ekorenevsky@gmail.com, peter.chen@nxp.com, joe@perches.com, tbroch@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, rajatja@google.com, bleung@google.com Subject: [V2] USB: Increment wakeup count on remote wakeup. Date: Fri, 20 Apr 2018 10:12:52 -0400 (EDT) [thread overview] Message-ID: <Pine.LNX.4.44L0.1804201010110.1407-100000@iolanthe.rowland.org> (raw) On Thu, 19 Apr 2018, Ravi Chandra Sadineni wrote: > On chromebooks we depend on wakeup count to identify the wakeup source. > But currently USB devices do not increment the wakeup count when they > trigger the remote wake. This patch addresses the same. > > Resume condition is reported differently on USB 2.0 and USB 3.0 devices. > > On USB 2.0 devices, a wake capable device, if wake enabled, drives > resume signal to indicate a remote wake (USB 2.0 spec section 7.1.7.7). > The upstream facing port then sets C_PORT_SUSPEND bit and reports a > port change event (USB 2.0 spec section 11.24.2.7.2.3). Thus if a port > has resumed before driving the resume signal from the host and > C_PORT_SUSPEND is set, then the device attached to the given port might > be the reason for the last system wakeup. Increment the wakeup count for > the same. > > On USB 3.0 devices, a function may signal that it wants to exit from device > suspend by sending a Function Wake Device Notification to the host (USB3.0 > spec section 8.5.6.4) Thus on receiving the Function Wake, increment the > wakeup count. > > Signed-off-by: Ravi Chandra Sadineni <ravisadineni@chromium.org> > --- > drivers/usb/core/hcd.c | 2 ++ > drivers/usb/core/hub.c | 10 +++++++++- > 2 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c > index 777036ae63674..ee0f3ec57ce49 100644 > --- a/drivers/usb/core/hcd.c > +++ b/drivers/usb/core/hcd.c > @@ -2374,7 +2374,9 @@ static void hcd_resume_work(struct work_struct *work) > void usb_hcd_resume_root_hub (struct usb_hcd *hcd) > { > unsigned long flags; > + struct device *dev = &hcd->self.root_hub->dev; > > + pm_wakeup_event(dev, 0); > spin_lock_irqsave (&hcd_root_hub_lock, flags); > if (hcd->rh_registered) { > set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags); In general, hcd->self.root_hub is guaranteed to be non-NULL only when hcd->rh_registered is set. Therefore the assignment to dev and the call to pm_wakeup_event() should be moved within this "if" statement. The rest of the patch looks okay. Alan Stern > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c > index f6ea16e9f6bb9..aa9968d90a48c 100644 > --- a/drivers/usb/core/hub.c > +++ b/drivers/usb/core/hub.c > @@ -653,12 +653,17 @@ void usb_wakeup_notification(struct usb_device *hdev, > unsigned int portnum) > { > struct usb_hub *hub; > + struct usb_port *port_dev; > > if (!hdev) > return; > > hub = usb_hub_to_struct_hub(hdev); > if (hub) { > + port_dev = hub->ports[portnum - 1]; > + if (port_dev && port_dev->child) > + pm_wakeup_event(&port_dev->child->dev, 0); > + > set_bit(portnum, hub->wakeup_bits); > kick_hub_wq(hub); > } > @@ -3434,8 +3439,11 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg) > > /* Skip the initial Clear-Suspend step for a remote wakeup */ > status = hub_port_status(hub, port1, &portstatus, &portchange); > - if (status == 0 && !port_is_suspended(hub, portstatus)) > + if (status == 0 && !port_is_suspended(hub, portstatus)) { > + if (portchange & USB_PORT_STAT_C_SUSPEND) > + pm_wakeup_event(&udev->dev, 0); > goto SuspendCleared; > + } > > /* see 7.1.7.7; affects power usage, but not budgeting */ > if (hub_is_superspeed(hub->hdev)) > --- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2018-04-20 14:12 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-04-19 0:18 [PATCH] USB: Increment wakeup count on remote wakeup Ravi Chandra Sadineni 2018-04-19 0:18 ` Ravi Chandra Sadineni 2018-04-19 9:30 ` [PATCH] " kbuild test robot 2018-04-19 9:30 ` kbuild test robot 2018-04-19 9:33 ` [PATCH] " kbuild test robot 2018-04-19 9:33 ` kbuild test robot 2018-04-19 15:01 ` [PATCH] " Alan Stern 2018-04-19 15:01 ` Alan Stern 2018-04-19 16:17 ` [PATCH] " Rajat Jain 2018-04-19 16:17 ` Rajat Jain 2018-04-20 0:27 ` [PATCH V2] " Ravi Chandra Sadineni 2018-04-20 0:27 ` [V2] " Ravi Chandra Sadineni 2018-04-20 14:12 ` Alan Stern [this message] 2018-04-20 14:12 ` Alan Stern 2018-04-20 17:05 ` [PATCH V3] " Ravi Chandra Sadineni 2018-04-20 17:05 ` [V3] " Ravi Chandra Sadineni 2018-04-20 17:29 ` [PATCH V3] " Alan Stern 2018-04-20 17:29 ` [V3] " Alan Stern 2018-04-20 17:54 ` [PATCH V4] " Ravi Chandra Sadineni 2018-04-20 17:54 ` [V4] " Ravi Chandra Sadineni 2018-04-20 18:08 ` [PATCH V5] " Ravi Chandra Sadineni 2018-04-20 18:08 ` [V5] " Ravi Chandra Sadineni 2018-04-20 18:22 ` [PATCH V5] " Alan Stern 2018-04-20 18:22 ` [V5] " Alan Stern 2018-04-21 8:59 ` [PATCH V5] " Greg KH 2018-04-21 8:59 ` [V5] " Greg Kroah-Hartman 2018-04-21 13:37 ` [PATCH V5] " Ravi Chandra Sadineni 2018-04-21 13:37 ` [V5] " Ravi Chandra Sadineni 2018-04-20 18:12 ` [PATCH V3] " Ravi Chandra Sadineni 2018-04-20 18:12 ` [V3] " Ravi Chandra Sadineni 2018-04-20 17:07 ` [PATCH V2] " Ravi Chandra Sadineni 2018-04-20 17:07 ` [V2] " Ravi Chandra Sadineni 2018-04-20 0:50 ` [PATCH] " Ravi Chandra Sadineni 2018-04-20 0:50 ` Ravi Chandra Sadineni
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