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path: root/drivers/usb/host/xhci-mem.c
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Diffstat (limited to 'drivers/usb/host/xhci-mem.c')
-rw-r--r--drivers/usb/host/xhci-mem.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 497ed7723e44..ec4338eec826 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1815,6 +1815,8 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
xhci->event_ring = NULL;
xhci_dbg(xhci, "Freed event ring\n");
+ if (xhci->lpm_command)
+ xhci_free_command(xhci, xhci->lpm_command);
xhci->cmd_ring_reserved_trbs = 0;
if (xhci->cmd_ring)
xhci_ring_free(xhci, xhci->cmd_ring);
@@ -2377,6 +2379,16 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring);
xhci_dbg_cmd_ptrs(xhci);
+ xhci->lpm_command = xhci_alloc_command(xhci, true, true, flags);
+ if (!xhci->lpm_command)
+ goto fail;
+
+ /* Reserve one command ring TRB for disabling LPM.
+ * Since the USB core grabs the shared usb_bus bandwidth mutex before
+ * disabling LPM, we only need to reserve one TRB for all devices.
+ */
+ xhci->cmd_ring_reserved_trbs++;
+
val = xhci_readl(xhci, &xhci->cap_regs->db_off);
val &= DBOFF_MASK;
xhci_dbg(xhci, "// Doorbell array is located at offset 0x%x"