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USB: Allow skipping device resume during system resume

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This allows xHC to remain in low power mode and not
resume the bus when system wide resume happens.
Controller comes out of low power mode only when usb
device issues a remote wakeup or if there is a host
initiated bus resume.

Change-Id: I96cdcb9e3642906b4afa08d9bde07e123d9b3977
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
This commit is contained in:
Hemant Kumar 2016-11-15 19:10:42 -08:00 committed by Mayank Rana
parent 95c277544e
commit aa75216da8
3 changed files with 25 additions and 0 deletions
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12
drivers/usb/core/driver.c
View File

@ -1462,6 +1462,9 @@ int usb_suspend(struct device *dev, pm_message_t msg)
{
struct usb_device *udev = to_usb_device(dev);
if (udev->bus->skip_resume && udev->state == USB_STATE_SUSPENDED)
return 0;
unbind_no_pm_drivers_interfaces(udev);
/* From now on we are sure all drivers support suspend/resume
@ -1491,6 +1494,15 @@ int usb_resume(struct device *dev, pm_message_t msg)
struct usb_device *udev = to_usb_device(dev);
int status;
/*
* Some buses would like to keep their devices in suspend
* state after system resume. Their resume happen when
* a remote wakeup is detected or interface driver start
* I/O.
*/
if (udev->bus->skip_resume)
return 0;
/* For all calls, take the device back to full power and
* tell the PM core in case it was autosuspended previously.
* Unbind the interfaces that will need rebinding later,

4
drivers/usb/host/xhci-plat.c
View File

@ -272,6 +272,8 @@ static int xhci_plat_probe(struct platform_device *pdev)
goto disable_runtime;
}
hcd_to_bus(hcd)->skip_resume = true;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(hcd->regs)) {
@ -318,6 +320,8 @@ static int xhci_plat_probe(struct platform_device *pdev)
goto disable_clk;
}
hcd_to_bus(xhci->shared_hcd)->skip_resume = true;
if (device_property_read_bool(&pdev->dev, "usb3-lpm-capable"))
xhci->quirks |= XHCI_LPM_SUPPORT;

9
include/linux/usb.h
View File

@ -468,6 +468,15 @@ struct usb_bus {
struct mon_bus *mon_bus; /* non-null when associated */
int monitored; /* non-zero when monitored */
#endif
unsigned skip_resume:1; /* All USB devices are brought into full
* power state after system resume. It
* is desirable for some buses to keep
* their devices in suspend state even
* after system resume. The devices
* are resumed later when a remote
* wakeup is detected or an interface
* driver starts I/O.
*/
};
struct usb_dev_state;