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xhci: Do warm-reset when both CAS and XDEV_RESUME are set

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commit 904df64a5f upstream.

Sometimes re-plugging a USB device during system sleep renders the device
useless:
[  173.418345] xhci_hcd 0000:00:14.0: Get port status 2-4 read: 0x14203e2, return 0x10262
...
[  176.496485] usb 2-4: Waited 2000ms for CONNECT
[  176.496781] usb usb2-port4: status 0000.0262 after resume, -19
[  176.497103] usb 2-4: can't resume, status -19
[  176.497438] usb usb2-port4: logical disconnect

Because PLS equals to XDEV_RESUME, xHCI driver reports U3 to usbcore,
despite of CAS bit is flagged.

So proritize CAS over XDEV_RESUME to let usbcore handle warm-reset for
the port.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200821091549.20556-3-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kai-Heng Feng
2020-08-21 12:15:48 +03:00
committed by Chris
parent 861ceb6b3e
commit ae41657117
1 changed files with 10 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/usb/host/xhci-hub.c
View File

@@ -651,15 +651,6 @@ static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
{
u32 pls = status_reg & PORT_PLS_MASK;
/* resume state is a xHCI internal state.
* Do not report it to usb core, instead, pretend to be U3,
* thus usb core knows it's not ready for transfer
*/
if (pls == XDEV_RESUME) {
*status |= USB_SS_PORT_LS_U3;
return;
}
/* When the CAS bit is set then warm reset
* should be performed on port
*/
@@ -681,6 +672,16 @@ static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
*/
pls |= USB_PORT_STAT_CONNECTION;
} else {
/*
* Resume state is an xHCI internal state. Do not report it to
* usb core, instead, pretend to be U3, thus usb core knows
* it's not ready for transfer.
*/
if (pls == XDEV_RESUME) {
*status |= USB_SS_PORT_LS_U3;
return;
}
/*
* If CAS bit isn't set but the Port is already at
* Compliance Mode, fake a connection so the USB core