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xhci: Fix port resume done detection for SS ports with LPM enabled

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commit 6cbcf59693 upstream.

A suspended SS port in U3 link state will go to U0 when resumed, but
can almost immediately after that enter U1 or U2 link power save
states before host controller driver reads the port status.

Host controller driver only checks for U0 state, and might miss
the finished resume, leaving flags unclear and skip notifying usb
code of the wake.

Add U1 and U2 to the possible link states when checking for finished
port resume.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman
2019-03-22 17:50:15 +02:00
committed by Greg Kroah-Hartman
parent 6c751894b8
commit 2423480fcd
2 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/usb/host/xhci-ring.c
View File

@@ -1645,10 +1645,13 @@ static void handle_port_status(struct xhci_hcd *xhci,
}
}
if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_U0 &&
DEV_SUPERSPEED_ANY(temp)) {
if ((temp & PORT_PLC) &&
DEV_SUPERSPEED_ANY(temp) &&
((temp & PORT_PLS_MASK) == XDEV_U0 ||
(temp & PORT_PLS_MASK) == XDEV_U1 ||
(temp & PORT_PLS_MASK) == XDEV_U2)) {
xhci_dbg(xhci, "resume SS port %d finished\n", port_id);
/* We've just brought the device into U0 through either the
/* We've just brought the device into U0/1/2 through either the
* Resume state after a device remote wakeup, or through the
* U3Exit state after a host-initiated resume. If it's a device
* initiated remote wake, don't pass up the link state change,

1
drivers/usb/host/xhci.h
View File

@@ -311,6 +311,7 @@ struct xhci_op_regs {
*/
#define PORT_PLS_MASK (0xf << 5)
#define XDEV_U0 (0x0 << 5)
#define XDEV_U1 (0x1 << 5)
#define XDEV_U2 (0x2 << 5)
#define XDEV_U3 (0x3 << 5)
#define XDEV_INACTIVE (0x6 << 5)