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linux/drivers/usb/host/xhci-pci.c
Sarah Sharp c3897aa538 xhci: Disable D3cold for buggy TI redrivers. 
Some xHCI hosts contain a "redriver" from TI that silently drops port
status connect changes if the port slips into Compliance Mode.  If the
port slips into compliance mode while the host is in D0, there will not
be a port status change event.  If the port slips into compliance mode
while the host is in D3, the host will not send a PME.  This includes
when the system is suspended (S3) or hibernated (S4).

If this happens when the system is in S3/S4, there is nothing software
can do.  Other port status change events that would normally cause the
host to wake the system from S3/S4 may also be lost.  This includes
remote wakeup, disconnects and connects on other ports, and overrcurrent
events.  A decision was made to _NOT_ disable system suspend/hibernate
on these systems, since users are unlikely to enable wakeup from S3/S4
for the xHCI host.

Software can deal with this issue when the system is in S0.  A work
around was put in to poll the port status registers for Compliance Mode.
The xHCI driver will continue to poll the registers while the host is
runtime suspended.  Unfortunately, that means we can't allow the PCI
device to go into D3cold, because power will be removed from the host,
and the config space will read as all Fs.

Disable D3cold in the xHCI PCI runtime suspend function.

This patch should be backported to kernels as old as 3.2, that
contain the commit 71c731a296 "usb: host:
xhci: Fix Compliance Mode on SN65LVPE502CP Hardware"

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: stable@vger.kernel.org
2013-05-24 15:23:59 -07:00

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/*
* xHCI host controller driver PCI Bus Glue.
*
* Copyright (C) 2008 Intel Corp.
*
* Author: Sarah Sharp
* Some code borrowed from the Linux EHCI driver.
*
* 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.
*/
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.h>
#include "xhci.h"
/* Device for a quirk */
#define PCI_VENDOR_ID_FRESCO_LOGIC 0x1b73
#define PCI_DEVICE_ID_FRESCO_LOGIC_PDK 0x1000
#define PCI_DEVICE_ID_FRESCO_LOGIC_FL1400 0x1400
#define PCI_VENDOR_ID_ETRON 0x1b6f
#define PCI_DEVICE_ID_ASROCK_P67 0x7023
static const char hcd_name[] = "xhci_hcd";
/* called after powerup, by probe or system-pm "wakeup" */
static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
{
/*
* TODO: Implement finding debug ports later.
* TODO: see if there are any quirks that need to be added to handle
* new extended capabilities.
*/
/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
if (!pci_set_mwi(pdev))
xhci_dbg(xhci, "MWI active\n");
xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
return 0;
}
static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
{
struct pci_dev *pdev = to_pci_dev(dev);
/* Look for vendor-specific quirks */
if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
(pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
pdev->revision == 0x0) {
xhci->quirks |= XHCI_RESET_EP_QUIRK;
xhci_dbg(xhci, "QUIRK: Fresco Logic xHC needs configure"
" endpoint cmd after reset endpoint\n");
}
/* Fresco Logic confirms: all revisions of this chip do not
* support MSI, even though some of them claim to in their PCI
* capabilities.
*/
xhci->quirks |= XHCI_BROKEN_MSI;
xhci_dbg(xhci, "QUIRK: Fresco Logic revision %u "
"has broken MSI implementation\n",
pdev->revision);
xhci->quirks |= XHCI_TRUST_TX_LENGTH;
}
if (pdev->vendor == PCI_VENDOR_ID_NEC)
xhci->quirks |= XHCI_NEC_HOST;
if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
xhci->quirks |= XHCI_AMD_0x96_HOST;
/* AMD PLL quirk */
if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
xhci->quirks |= XHCI_AMD_PLL_FIX;
if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
xhci->quirks |= XHCI_LPM_SUPPORT;
xhci->quirks |= XHCI_INTEL_HOST;
}
if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
xhci->limit_active_eps = 64;
xhci->quirks |= XHCI_SW_BW_CHECKING;
/*
* PPT desktop boards DH77EB and DH77DF will power back on after
* a few seconds of being shutdown. The fix for this is to
* switch the ports from xHCI to EHCI on shutdown. We can't use
* DMI information to find those particular boards (since each
* vendor will change the board name), so we have to key off all
* PPT chipsets.
*/
xhci->quirks |= XHCI_SPURIOUS_REBOOT;
xhci->quirks |= XHCI_AVOID_BEI;
}
if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
pdev->device == PCI_DEVICE_ID_ASROCK_P67) {
xhci->quirks |= XHCI_RESET_ON_RESUME;
xhci_dbg(xhci, "QUIRK: Resetting on resume\n");
xhci->quirks |= XHCI_TRUST_TX_LENGTH;
}
if (pdev->vendor == PCI_VENDOR_ID_VIA)
xhci->quirks |= XHCI_RESET_ON_RESUME;
}
/* called during probe() after chip reset completes */
static int xhci_pci_setup(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci;
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
int retval;
retval = xhci_gen_setup(hcd, xhci_pci_quirks);
if (retval)
return retval;
xhci = hcd_to_xhci(hcd);
if (!usb_hcd_is_primary_hcd(hcd))
return 0;
pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
/* Find any debug ports */
retval = xhci_pci_reinit(xhci, pdev);
if (!retval)
return retval;
kfree(xhci);
return retval;
}
/*
* We need to register our own PCI probe function (instead of the USB core's
* function) in order to create a second roothub under xHCI.
*/
static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int retval;
struct xhci_hcd *xhci;
struct hc_driver *driver;
struct usb_hcd *hcd;
driver = (struct hc_driver *)id->driver_data;
/* Register the USB 2.0 roothub.
* FIXME: USB core must know to register the USB 2.0 roothub first.
* This is sort of silly, because we could just set the HCD driver flags
* to say USB 2.0, but I'm not sure what the implications would be in
* the other parts of the HCD code.
*/
retval = usb_hcd_pci_probe(dev, id);
if (retval)
return retval;
/* USB 2.0 roothub is stored in the PCI device now. */
hcd = dev_get_drvdata(&dev->dev);
xhci = hcd_to_xhci(hcd);
xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
pci_name(dev), hcd);
if (!xhci->shared_hcd) {
retval = -ENOMEM;
goto dealloc_usb2_hcd;
}
/* Set the xHCI pointer before xhci_pci_setup() (aka hcd_driver.reset)
* is called by usb_add_hcd().
*/
*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
IRQF_SHARED);
if (retval)
goto put_usb3_hcd;
/* Roothub already marked as USB 3.0 speed */
/* We know the LPM timeout algorithms for this host, let the USB core
* enable and disable LPM for devices under the USB 3.0 roothub.
*/
if (xhci->quirks & XHCI_LPM_SUPPORT)
hcd_to_bus(xhci->shared_hcd)->root_hub->lpm_capable = 1;
return 0;
put_usb3_hcd:
usb_put_hcd(xhci->shared_hcd);
dealloc_usb2_hcd:
usb_hcd_pci_remove(dev);
return retval;
}
static void xhci_pci_remove(struct pci_dev *dev)
{
struct xhci_hcd *xhci;
xhci = hcd_to_xhci(pci_get_drvdata(dev));
if (xhci->shared_hcd) {
usb_remove_hcd(xhci->shared_hcd);
usb_put_hcd(xhci->shared_hcd);
}
usb_hcd_pci_remove(dev);
kfree(xhci);
}
#ifdef CONFIG_PM
static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
/*
* Systems with the TI redriver that loses port status change events
* need to have the registers polled during D3, so avoid D3cold.
*/
if (xhci_compliance_mode_recovery_timer_quirk_check())
pdev->no_d3cold = true;
return xhci_suspend(xhci);
}
static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
int retval = 0;
/* The BIOS on systems with the Intel Panther Point chipset may or may
* not support xHCI natively. That means that during system resume, it
* may switch the ports back to EHCI so that users can use their
* keyboard to select a kernel from GRUB after resume from hibernate.
*
* The BIOS is supposed to remember whether the OS had xHCI ports
* enabled before resume, and switch the ports back to xHCI when the
* BIOS/OS semaphore is written, but we all know we can't trust BIOS
* writers.
*
* Unconditionally switch the ports back to xHCI after a system resume.
* We can't tell whether the EHCI or xHCI controller will be resumed
* first, so we have to do the port switchover in both drivers. Writing
* a '1' to the port switchover registers should have no effect if the
* port was already switched over.
*/
if (usb_is_intel_switchable_xhci(pdev))
usb_enable_xhci_ports(pdev);
retval = xhci_resume(xhci, hibernated);
return retval;
}
#endif /* CONFIG_PM */
static const struct hc_driver xhci_pci_hc_driver = {
.description = hcd_name,
.product_desc = "xHCI Host Controller",
.hcd_priv_size = sizeof(struct xhci_hcd *),
/*
* generic hardware linkage
*/
.irq = xhci_irq,
.flags = HCD_MEMORY | HCD_USB3 | HCD_SHARED,
/*
* basic lifecycle operations
*/
.reset = xhci_pci_setup,
.start = xhci_run,
#ifdef CONFIG_PM
.pci_suspend = xhci_pci_suspend,
.pci_resume = xhci_pci_resume,
#endif
.stop = xhci_stop,
.shutdown = xhci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = xhci_urb_enqueue,
.urb_dequeue = xhci_urb_dequeue,
.alloc_dev = xhci_alloc_dev,
.free_dev = xhci_free_dev,
.alloc_streams = xhci_alloc_streams,
.free_streams = xhci_free_streams,
.add_endpoint = xhci_add_endpoint,
.drop_endpoint = xhci_drop_endpoint,
.endpoint_reset = xhci_endpoint_reset,
.check_bandwidth = xhci_check_bandwidth,
.reset_bandwidth = xhci_reset_bandwidth,
.address_device = xhci_address_device,
.update_hub_device = xhci_update_hub_device,
.reset_device = xhci_discover_or_reset_device,
/*
* scheduling support
*/
.get_frame_number = xhci_get_frame,
/* Root hub support */
.hub_control = xhci_hub_control,
.hub_status_data = xhci_hub_status_data,
.bus_suspend = xhci_bus_suspend,
.bus_resume = xhci_bus_resume,
/*
* call back when device connected and addressed
*/
.update_device = xhci_update_device,
.set_usb2_hw_lpm = xhci_set_usb2_hardware_lpm,
.enable_usb3_lpm_timeout = xhci_enable_usb3_lpm_timeout,
.disable_usb3_lpm_timeout = xhci_disable_usb3_lpm_timeout,
.find_raw_port_number = xhci_find_raw_port_number,
};
/*-------------------------------------------------------------------------*/
/* PCI driver selection metadata; PCI hotplugging uses this */
static const struct pci_device_id pci_ids[] = { {
/* handle any USB 3.0 xHCI controller */
PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
.driver_data = (unsigned long) &xhci_pci_hc_driver,
},
{ /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, pci_ids);
/* pci driver glue; this is a "new style" PCI driver module */
static struct pci_driver xhci_pci_driver = {
.name = (char *) hcd_name,
.id_table = pci_ids,
.probe = xhci_pci_probe,
.remove = xhci_pci_remove,
/* suspend and resume implemented later */
.shutdown = usb_hcd_pci_shutdown,
#ifdef CONFIG_PM_SLEEP
.driver = {
.pm = &usb_hcd_pci_pm_ops
},
#endif
};
int __init xhci_register_pci(void)
{
return pci_register_driver(&xhci_pci_driver);
}
void xhci_unregister_pci(void)
{
pci_unregister_driver(&xhci_pci_driver);
}
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