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path: root/drivers/usb/host/xhci-ring.c
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Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
-rw-r--r--drivers/usb/host/xhci-ring.c45
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index a8d92c90fb58..65750582133f 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1521,6 +1521,35 @@ static void handle_device_notification(struct xhci_hcd *xhci,
usb_wakeup_notification(udev->parent, udev->portnum);
}
+/*
+ * Quirk hanlder for errata seen on Cavium ThunderX2 processor XHCI
+ * Controller.
+ * 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.
+ *
+ * Reset the PHY after the USB device is disconnected if device speed
+ * is less than HCD_USB3.
+ * Retry the reset sequence max of 4 times checking the PLL lock status.
+ *
+ */
+static void xhci_cavium_reset_phy_quirk(struct xhci_hcd *xhci)
+{
+ struct usb_hcd *hcd = xhci_to_hcd(xhci);
+ u32 pll_lock_check;
+ u32 retry_count = 4;
+
+ do {
+ /* Assert PHY reset */
+ writel(0x6F, hcd->regs + 0x1048);
+ udelay(10);
+ /* De-assert the PHY reset */
+ writel(0x7F, hcd->regs + 0x1048);
+ udelay(200);
+ pll_lock_check = readl(hcd->regs + 0x1070);
+ } while (!(pll_lock_check & 0x1) && --retry_count);
+}
+
static void handle_port_status(struct xhci_hcd *xhci,
union xhci_trb *event)
{
@@ -1556,6 +1585,13 @@ static void handle_port_status(struct xhci_hcd *xhci,
goto cleanup;
}
+ /* We might get interrupts after shared_hcd is removed */
+ if (port->rhub == &xhci->usb3_rhub && xhci->shared_hcd == NULL) {
+ xhci_dbg(xhci, "ignore port event for removed USB3 hcd\n");
+ bogus_port_status = true;
+ goto cleanup;
+ }
+
hcd = port->rhub->hcd;
bus_state = &xhci->bus_state[hcd_index(hcd)];
hcd_portnum = port->hcd_portnum;
@@ -1639,7 +1675,7 @@ static void handle_port_status(struct xhci_hcd *xhci,
* RExit to a disconnect state). If so, let the the driver know it's
* out of the RExit state.
*/
- if (!DEV_SUPERSPEED_ANY(portsc) &&
+ if (!DEV_SUPERSPEED_ANY(portsc) && hcd->speed < HCD_USB3 &&
test_and_clear_bit(hcd_portnum,
&bus_state->rexit_ports)) {
complete(&bus_state->rexit_done[hcd_portnum]);
@@ -1647,8 +1683,12 @@ static void handle_port_status(struct xhci_hcd *xhci,
goto cleanup;
}
- if (hcd->speed < HCD_USB3)
+ if (hcd->speed < HCD_USB3) {
xhci_test_and_clear_bit(xhci, port, PORT_PLC);
+ if ((xhci->quirks & XHCI_RESET_PLL_ON_DISCONNECT) &&
+ (portsc & PORT_CSC) && !(portsc & PORT_CONNECT))
+ xhci_cavium_reset_phy_quirk(xhci);
+ }
cleanup:
/* Update event ring dequeue pointer before dropping the lock */
@@ -2266,6 +2306,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
goto cleanup;
case COMP_RING_UNDERRUN:
case COMP_RING_OVERRUN:
+ case COMP_STOPPED_LENGTH_INVALID:
goto cleanup;
default:
xhci_err(xhci, "ERROR Transfer event for unknown stream ring slot %u ep %u\n",