diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2015-01-29 15:05:04 -0500 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2015-03-02 13:16:59 +0000 |
| commit | cca1efc9847e218489ebb3db26ac6ed68abf2832 (patch) | |
| tree | 819aefda631d4b55d20658588f65fcd811a0d87a | |
| parent | 27e636e8989a2841d1476d0fae6f6d485fabb954 (diff) | |
USB: add flag for HCDs that can't receive wakeup requests (isp1760-hcd)
commit 074f9dd55f9cab1b82690ed7e44bcf38b9616ce0 upstream.
Currently the USB stack assumes that all host controller drivers are
capable of receiving wakeup requests from downstream devices.
However, this isn't true for the isp1760-hcd driver, which means that
it isn't safe to do a runtime suspend of any device attached to a
root-hub port if the device requires wakeup.
This patch adds a "cant_recv_wakeups" flag to the usb_hcd structure
and sets the flag in isp1760-hcd. The core is modified to prevent a
direct child of the root hub from being put into runtime suspend with
wakeup enabled if the flag is set.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
| -rw-r--r-- | drivers/usb/core/driver.c | 12 | ||||
| -rw-r--r-- | drivers/usb/host/isp1760-hcd.c | 3 | ||||
| -rw-r--r-- | include/linux/usb/hcd.h | 2 |
3 files changed, 17 insertions, 0 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 4aeb10034de7..37c7ce9af220 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1800,6 +1800,18 @@ static int autosuspend_check(struct usb_device *udev) dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); return -EOPNOTSUPP; } + + /* + * If the device is a direct child of the root hub and the HCD + * doesn't handle wakeup requests, don't allow autosuspend when + * wakeup is needed. + */ + if (w && udev->parent == udev->bus->root_hub && + bus_to_hcd(udev->bus)->cant_recv_wakeups) { + dev_dbg(&udev->dev, "HCD doesn't handle wakeup requests\n"); + return -EOPNOTSUPP; + } + udev->do_remote_wakeup = w; return 0; } diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c index 51a0ae9cdd1d..5ea7c6bdfd28 100644 --- a/drivers/usb/host/isp1760-hcd.c +++ b/drivers/usb/host/isp1760-hcd.c @@ -2247,6 +2247,9 @@ struct usb_hcd *isp1760_register(phys_addr_t res_start, resource_size_t res_len, hcd->rsrc_start = res_start; hcd->rsrc_len = res_len; + /* This driver doesn't support wakeup requests */ + hcd->cant_recv_wakeups = 1; + ret = usb_add_hcd(hcd, irq, irqflags); if (ret) goto err_unmap; diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h index 52598bdce2ba..6e98f62ea70d 100644 --- a/include/linux/usb/hcd.h +++ b/include/linux/usb/hcd.h @@ -144,6 +144,8 @@ struct usb_hcd { unsigned has_tt:1; /* Integrated TT in root hub */ unsigned amd_resume_bug:1; /* AMD remote wakeup quirk */ unsigned can_do_streams:1; /* HC supports streams */ + unsigned cant_recv_wakeups:1; + /* wakeup requests from downstream aren't received */ unsigned int irq; /* irq allocated */ void __iomem *regs; /* device memory/io */ |