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>

7 files changed, 1 insertions, 239 deletions

diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index dfd3bf3aa4de..70b496dc18a0 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -337,11 +337,6 @@ static int debug_async_open(struct inode *, struct file *);
 static int debug_periodic_open(struct inode *, struct file *);
 static int debug_registers_open(struct inode *, struct file *);
 static int debug_async_open(struct inode *, struct file *);
-static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
-                                   size_t count, loff_t *ppos);
-static ssize_t debug_lpm_write(struct file *file, const char __user *buffer,
-                              size_t count, loff_t *ppos);
-static int debug_lpm_close(struct inode *inode, struct file *file);
 
 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
 static int debug_close(struct inode *, struct file *);
@@ -367,14 +362,6 @@ static const struct file_operations debug_registers_fops = {
         .release        = debug_close,
         .llseek         = default_llseek,
 };
-static const struct file_operations debug_lpm_fops = {
-        .owner          = THIS_MODULE,
-        .open           = simple_open,
-        .read           = debug_lpm_read,
-        .write          = debug_lpm_write,
-        .release        = debug_lpm_close,
-        .llseek         = noop_llseek,
-};
 
 static struct dentry *ehci_debug_root;
 
@@ -956,86 +943,6 @@ static int debug_registers_open(struct inode *inode, struct file *file)
         return file->private_data ? 0 : -ENOMEM;
 }
 
-static int debug_lpm_close(struct inode *inode, struct file *file)
-{
-        return 0;
-}
-
-static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
-                                   size_t count, loff_t *ppos)
-{
-        /* TODO: show lpm stats */
-        return 0;
-}
-
-static ssize_t debug_lpm_write(struct file *file, const char __user *user_buf,
-                              size_t count, loff_t *ppos)
-{
-        struct usb_hcd          *hcd;
-        struct ehci_hcd         *ehci;
-        char buf[50];
-        size_t len;
-        u32 temp;
-        unsigned long port;
-        u32 __iomem     *portsc ;
-        u32 params;
-
-        hcd = bus_to_hcd(file->private_data);
-        ehci = hcd_to_ehci(hcd);
-
-        len = min(count, sizeof(buf) - 1);
-        if (copy_from_user(buf, user_buf, len))
-                return -EFAULT;
-        buf[len] = '\0';
-        if (len > 0 && buf[len - 1] == '\n')
-                buf[len - 1] = '\0';
-
-        if (strncmp(buf, "enable", 5) == 0) {
-                if (strict_strtoul(buf + 7, 10, &port))
-                        return -EINVAL;
-                params = ehci_readl(ehci, &ehci->caps->hcs_params);
-                if (port > HCS_N_PORTS(params)) {
-                        ehci_dbg(ehci, "ERR: LPM on bad port %lu\n", port);
-                        return -ENODEV;
-                }
-                portsc = &ehci->regs->port_status[port-1];
-                temp = ehci_readl(ehci, portsc);
-                if (!(temp & PORT_DEV_ADDR)) {
-                        ehci_dbg(ehci, "LPM: no device attached\n");
-                        return -ENODEV;
-                }
-                temp |= PORT_LPM;
-                ehci_writel(ehci, temp, portsc);
-                printk(KERN_INFO "force enable LPM for port %lu\n", port);
-        } else if (strncmp(buf, "hird=", 5) == 0) {
-                unsigned long hird;
-                if (strict_strtoul(buf + 5, 16, &hird))
-                        return -EINVAL;
-                printk(KERN_INFO "setting hird %s %lu\n", buf + 6, hird);
-                ehci->command = (ehci->command & ~CMD_HIRD) | (hird << 24);
-                ehci_writel(ehci, ehci->command, &ehci->regs->command);
-        } else if (strncmp(buf, "disable", 7) == 0) {
-                if (strict_strtoul(buf + 8, 10, &port))
-                        return -EINVAL;
-                params = ehci_readl(ehci, &ehci->caps->hcs_params);
-                if (port > HCS_N_PORTS(params)) {
-                        ehci_dbg(ehci, "ERR: LPM off bad port %lu\n", port);
-                        return -ENODEV;
-                }
-                portsc = &ehci->regs->port_status[port-1];
-                temp = ehci_readl(ehci, portsc);
-                if (!(temp & PORT_DEV_ADDR)) {
-                        ehci_dbg(ehci, "ERR: no device attached\n");
-                        return -ENODEV;
-                }
-                temp &= ~PORT_LPM;
-                ehci_writel(ehci, temp, portsc);
-                printk(KERN_INFO "disabled LPM for port %lu\n", port);
-        } else
-                return -EOPNOTSUPP;
-        return count;
-}
-
 static inline void create_debug_files (struct ehci_hcd *ehci)
 {
         struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
@@ -1056,10 +963,6 @@ static inline void create_debug_files (struct ehci_hcd *ehci)
                                                     &debug_registers_fops))
                 goto file_error;
 
-        if (!debugfs_create_file("lpm", S_IRUGO|S_IWUSR, ehci->debug_dir, bus,
-                                                    &debug_lpm_fops))
-                goto file_error;
-
         return;
 
 file_error:
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 9c2afb516fe5..68dd1c99b1f5 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -39,7 +39,6 @@
 #include <linux/dma-mapping.h>
 #include <linux/debugfs.h>
 #include <linux/slab.h>
-#include <linux/uaccess.h>
 
 #include <asm/byteorder.h>
 #include <asm/io.h>
@@ -108,11 +107,6 @@ static bool ignore_oc = 0;
 module_param (ignore_oc, bool, S_IRUGO);
 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
 
-/* for link power management(LPM) feature */
-static unsigned int hird;
-module_param(hird, int, S_IRUGO);
-MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
-
 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
 
 /*-------------------------------------------------------------------------*/
@@ -318,7 +312,6 @@ static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 
 #include "ehci-timer.c"
 #include "ehci-hub.c"
-#include "ehci-lpm.c"
 #include "ehci-mem.c"
 #include "ehci-q.c"
 #include "ehci-sched.c"
@@ -580,17 +573,6 @@ static int ehci_init(struct usb_hcd *hcd)
                 temp &= ~(3 << 2);
                 temp |= (EHCI_TUNE_FLS << 2);