xhci: Workaround to get Intel xHCI reset working more reliably

commit a5964396190d0c40dd549c23848c282fffa5d1f2 upstream.

Existing Intel xHCI controllers require a delay of 1 mS,
after setting the CMD_RESET bit in command register, before
accessing any HC registers. This allows the HC to complete
the reset operation and be ready for HC register access.
Without this delay, the subsequent HC register access,
may result in a system hang, very rarely.

Verified CherryView / Braswell platforms go through over
5000 warm reboot cycles (which was not possible without
this patch), without any xHCI reset hang.

Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Tested-by: Joe Lawrence <joe.lawrence@stratus.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 26f62b2b33f849c3c0ff0ad3195fbe1df5392a97..1e6d7579709e7b66c16476a65fc82e377dee6bb1 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -175,6 +175,16 @@ int xhci_reset(struct xhci_hcd *xhci)
        command |= CMD_RESET;
        writel(command, &xhci->op_regs->command);
 
+       /* Existing Intel xHCI controllers require a delay of 1 mS,
+        * after setting the CMD_RESET bit, and before accessing any
+        * HC registers. This allows the HC to complete the
+        * reset operation and be ready for HC register access.
+        * Without this delay, the subsequent HC register access,
+        * may result in a system hang very rarely.
+        */
+       if (xhci->quirks & XHCI_INTEL_HOST)
+               udelay(1000);
+
        ret = xhci_handshake(&xhci->op_regs->command,
                        CMD_RESET, 0, 10 * 1000 * 1000);
        if (ret)