This is a note to let you know that I've just added the patch titled
USB: add flag for HCDs that can't receive wakeup requests
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-testing branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will be merged to the usb-next branch sometime soon,
after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
>From 074f9dd55f9cab1b82690ed7e44bcf38b9616ce0 Mon Sep 17 00:00:00 2001
From: Alan Stern <[email protected]>
Date: Thu, 29 Jan 2015 15:05:04 -0500
Subject: USB: add flag for HCDs that can't receive wakeup requests
(isp1760-hcd)
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 <[email protected]>
Tested-by: Nicolas Pitre <[email protected]>
CC: <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/core/driver.c | 12 ++++++++++++
drivers/usb/host/isp1760-hcd.c | 3 +++
include/linux/usb/hcd.h | 2 ++
3 files changed, 17 insertions(+)
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index c76ec9758ce3..818369afff63 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1780,6 +1780,18 @@ 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 dbba455884f4..cecf39a220e7 100644
--- a/drivers/usb/host/isp1760-hcd.c
+++ b/drivers/usb/host/isp1760-hcd.c
@@ -2245,6 +2245,9 @@ 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 8968f616e414..68b1e836dff1 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -146,6 +146,8 @@ struct usb_hcd {
unsigned amd_resume_bug:1; /* AMD remote wakeup quirk */
unsigned can_do_streams:1; /* HC supports streams */
unsigned tpl_support:1; /* OTG & EH TPL support */
+ unsigned cant_recv_wakeups:1;
+ /* wakeup requests from downstream aren't received */
unsigned int irq; /* irq allocated */
void __iomem *regs; /* device memory/io */
--
2.2.2
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