USB: EHCI: remove unused Link Power Management code

This patch (as1622) removes the USB-2.1 Link Power Management code
from the ehci-hcd driver.  This code was never integrated with
usbcore, it is full of bugs, and it was not getting used by anybody.

However, the debugging code for dumping the LPM-related fields in the
EHCI registers is left in place.  In theory it might be useful to see
these values, even though we don't use them.

This essentially amounts to a partial revert of commit
aa4d8342988d0c1a79ff19b2ede1e81dfbb16ea5 (USB: EHCI: EHCI 1.1
addendum: preparation) and an almost full revert of commit
48f24970144479c29b8cee6d2e1dbedf6dcf9cfb (USB: EHCI: EHCI 1.1
addendum: Basic LPM feature support) plus its follow-ons.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 101 deletions

diff --git a/drivers/usb/host/ehci-lpm.c b/drivers/usb/host/ehci-lpm.c
deleted file mode 100644
index 6b092c1dff64..000000000000
--- a/drivers/usb/host/ehci-lpm.c
+++ /dev/null
@@ -1,101 +0,0 @@
-/* ehci-lpm.c EHCI HCD LPM support code
- * Copyright (c) 2008 - 2010,  Intel Corporation.
- * Author: Jacob Pan <jacob.jun.pan@intel.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-/* this file is part of ehci-hcd.c */
-
-static int ehci_lpm_set_da(struct ehci_hcd *ehci, int dev_addr, int port_num)
-{
-        u32 __iomem portsc;
-
-        ehci_dbg(ehci, "set dev address %d for port %d\n", dev_addr, port_num);
-        if (port_num > HCS_N_PORTS(ehci->hcs_params)) {
-                ehci_dbg(ehci, "invalid port number %d\n", port_num);
-                return -ENODEV;
-        }
-        portsc = ehci_readl(ehci, &ehci->regs->port_status[port_num-1]);
-        portsc &= ~PORT_DEV_ADDR;
-        portsc |= dev_addr<<25;
-        ehci_writel(ehci, portsc, &ehci->regs->port_status[port_num-1]);
-        return 0;
-}
-
-/*
- * this function is used to check if the device support LPM
- * if yes, mark the PORTSC register with PORT_LPM bit
- */
-static int ehci_lpm_check(struct ehci_hcd *ehci, int port)
-{
-        u32 __iomem     *portsc ;
-        u32 val32;
-        int retval;
-
-        portsc = &ehci->regs->port_status[port-1];
-        val32 = ehci_readl(ehci, portsc);
-        if (!(val32 & PORT_DEV_ADDR)) {
-                ehci_dbg(ehci, "LPM: no device attached\n");
-                return -ENODEV;
-        }
-        val32 |= PORT_LPM;
-        ehci_writel(ehci, val32, portsc);
-        msleep(5);
-        val32 |= PORT_SUSPEND;
-        ehci_dbg(ehci, "Sending LPM 0x%08x to port %d\n", val32, port);
-        ehci_writel(ehci, val32, portsc);
-        /* wait for ACK */
-        msleep(10);
-        retval = handshake(ehci, &ehci->regs->port_status[port-1], PORT_SSTS,
-                        PORTSC_SUSPEND_STS_ACK, 125);
-        dbg_port(ehci, "LPM", port, val32);
-        if (retval != -ETIMEDOUT) {
-                ehci_dbg(ehci, "LPM: device ACK for LPM\n");
-                val32 |= PORT_LPM;
-                /*
-                 * now device should be in L1 sleep, let's wake up the device
-                 * so that we can complete enumeration.
-                 */
-                ehci_writel(ehci, val32, portsc);
-                msleep(10);
-                val32 |= PORT_RESUME;
-                ehci_writel(ehci, val32, portsc);
-        } else {
-                ehci_dbg(ehci, "LPM: device does not ACK, disable LPM %d\n",
-                        retval);
-                val32 &= ~PORT_LPM;
-                retval = -ETIMEDOUT;
-                ehci_writel(ehci, val32, portsc);
-        }
-
-        return retval;
-}
-
-static int __maybe_unused ehci_update_device(struct usb_hcd *hcd,
-                struct usb_device *udev)
-{
-        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-        int rc = 0;
-
-        if (!udev->parent) /* udev is root hub itself, impossible */
-                rc = -1;
-        /* we only support lpm device connected to root hub yet */
-        if (ehci->has_lpm && !udev->parent->parent) {
-                rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
-                if (!rc)
-                        rc = ehci_lpm_check(ehci, udev->portnum);
-        }
-        return rc;
-}