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

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commit 6cbcf596934c8e16d6288c7cc62dfb7ad8eadf15 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 syphyr
parent 7f01560885
commit 270ff6f924
2 changed files with 7 additions and 3 deletions
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9
drivers/usb/host/xhci-ring.c
View file

@ -1724,10 +1724,13 @@ static void handle_port_status(struct xhci_hcd *xhci,
}
}
if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_U0 &&
DEV_SUPERSPEED(temp)) {
if ((temp & PORT_PLC) &&
DEV_SUPERSPEED(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

@ -278,6 +278,7 @@ 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)