[PATCH] USB: fix EHCI early handoff issues

This moves the previously widely-used ehci-pci.c BIOS handoff
code into the pci-quirks.c file, replacing the less widely used
"early handoff" version that seems to cause problems lately.

One notable change:  the "early handoff" version always enabled
an SMI IRQ ... and did so even if the pre-Linux code said it was
not using EHCI (and not expecting EHCI SMIs).  Looks like a goof
in a workaround for some unknown BIOS version.

This merged version only forcibly enables those IRQs when pre-Linux
code says it's using EHCI.  And now it always forces them off "just
in case".

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 60 deletions

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 08ca0f849dab..286b2f4acdc2 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -24,40 +24,6 @@
 
 /*-------------------------------------------------------------------------*/
 
-/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
- * off the controller (maybe it can boot from highspeed USB disks).
- */
-static int bios_handoff(struct ehci_hcd *ehci, int where, u32 cap)
-{
-        struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
-
-        /* always say Linux will own the hardware */
-        pci_write_config_byte(pdev, where + 3, 1);
-
-        /* maybe wait a while for BIOS to respond */
-        if (cap & (1 << 16)) {
-                int msec = 5000;
-
-                do {
-                        msleep(10);
-                        msec -= 10;
-                        pci_read_config_dword(pdev, where, &cap);
-                } while ((cap & (1 << 16)) && msec);
-                if (cap & (1 << 16)) {
-                        ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
-                                where, cap);
-                        // some BIOS versions seem buggy...
-                        // return 1;
-                        ehci_warn(ehci, "continuing after BIOS bug...\n");
-                        /* disable all SMIs, and clear "BIOS owns" flag */
-                        pci_write_config_dword(pdev, where + 4, 0);
-                        pci_write_config_byte(pdev, where + 2, 0);
-                } else
-                        ehci_dbg(ehci, "BIOS handoff succeeded\n");
-        }
-        return 0;
-}
-
 /* called after powerup, by probe or system-pm "wakeup" */
 static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
 {
@@ -84,32 +50,9 @@ static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
                 }
         }
 
-        temp = HCC_EXT_CAPS(readl(&ehci->caps->hcc_params));
-
-        /* EHCI 0.96 and later may have "extended capabilities" */
-        while (temp && count--) {
-                u32             cap;
-
-                pci_read_config_dword(pdev, temp, &cap);
-                ehci_dbg(ehci, "capability %04x at %02x\n", cap, temp);
-                switch (cap & 0xff) {
-                case 1:                 /* BIOS/SMM/... handoff */
-                        if (bios_handoff(ehci, temp, cap) != 0)
-                                return -EOPNOTSUPP;
-                        break;
-                case 0:                 /* illegal reserved capability */
-                        ehci_dbg(ehci, "illegal capability!\n");
-                        cap = 0;
-                        /* FALLTHROUGH */
-                default:                /* unknown */
-                        break;
-                }
-                temp = (cap >> 8) & 0xff;
-        }
-        if (!count) {
-                ehci_err(ehci, "bogus capabilities ... PCI problems!\n");
-                return -EIO;
-        }
+        /* we expect static quirk code to handle the "extended capabilities"
+         * (currently just BIOS handoff) allowed starting with EHCI 0.96
+         */
 
         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
         retval = pci_set_mwi(pdev);