diff options
| author | Cherian, George <George.Cherian@cavium.com> | 2018-11-09 17:21:22 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-09 08:31:09 -0800 |
| commit | 11644a7659529730eaf2f166efaabe7c3dc7af8c (patch) | |
| tree | 7ee807cbcb6b08204365d0a274c7240bf04aa0dd /drivers/usb/host/xhci-pci.c | |
| parent | a5baeaeabcca3244782a9b6382ebab6f8a58f583 (diff) | |
| download | linux-11644a7659529730eaf2f166efaabe7c3dc7af8c.tar.bz2 | |
xhci: Add quirk to workaround the errata seen on Cavium Thunder-X2 Soc
Implement workaround for ThunderX2 Errata-129 (documented in
CN99XX Known Issues" available at Cavium support site).
As per ThunderX2errata-129, USB 2 device may come up as USB 1
if a connection to a USB 1 device is followed by another connection to
a USB 2 device, the link will come up as USB 1 for the USB 2 device.
Resolution: Reset the PHY after the USB 1 device is disconnected.
The PHY reset sequence is done using private registers in XHCI register
space. After the PHY is reset we check for the PLL lock status and retry
the operation if it fails. From our tests, retrying 4 times is sufficient.
Add a new quirk flag XHCI_RESET_PLL_ON_DISCONNECT to invoke the workaround
in handle_xhci_port_status().
Cc: stable@vger.kernel.org
Signed-off-by: George Cherian <george.cherian@cavium.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci-pci.c')
| -rw-r--r-- | drivers/usb/host/xhci-pci.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index 1fb448cd2667..a9515265db4d 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -248,6 +248,11 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci) if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241) xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7; + if ((pdev->vendor == PCI_VENDOR_ID_BROADCOM || + pdev->vendor == PCI_VENDOR_ID_CAVIUM) && + pdev->device == 0x9026) + xhci->quirks |= XHCI_RESET_PLL_ON_DISCONNECT; + if (xhci->quirks & XHCI_RESET_ON_RESUME) xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "QUIRK: Resetting on resume"); |