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authorDavid Brownell <david-b@pacbell.net>2006-01-20 13:55:14 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-03-20 14:49:55 -0800
commitf8aeb3bb8657b207895aa10f75e63f2c48d08985 (patch)
treea752ed44de17a3f0315cffeddfb944cb33c778aa /drivers/usb/host
parent4186ecf8ad16dd05759a09594de6a87e48759ba6 (diff)
[PATCH] USB: EHCI and NF2 quirk
This teaches the EHCI driver about a quirk seen in older NForce2 chips, adding a workaround to ignore selective suspend requests. Bus-wide (so-called "global") suspend still works, as does USB wakeup of a root hub that's globally suspended. There's still a hole in this support though. Strictly speaking, this should _fail_ selective suspend requests, rather than ignoring them, since doing it this way means that devices which should be able to issue remote wakeup are not going to be able to do that. For now, we'll just live with that problem ... since usbcore expects to do selective suspend on the way towards a full bus suspend, and usbcore needs to be able to do full bus suspend. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/ehci-hub.c4
-rw-r--r--drivers/usb/host/ehci-pci.c25
-rw-r--r--drivers/usb/host/ehci.h3
3 files changed, 30 insertions, 2 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 69b0b9be7a64..d03e3cad5ca8 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -359,6 +359,8 @@ static int ehci_hub_control (
case USB_PORT_FEAT_SUSPEND:
if (temp & PORT_RESET)
goto error;
+ if (ehci->no_selective_suspend)
+ break;
if (temp & PORT_SUSPEND) {
if ((temp & PORT_PE) == 0)
goto error;
@@ -514,6 +516,8 @@ static int ehci_hub_control (
temp &= ~PORT_RWC_BITS;
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
+ if (ehci->no_selective_suspend)
+ break;
if ((temp & PORT_PE) == 0
|| (temp & PORT_RESET) != 0)
goto error;
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 3a6687df5594..1e03f1a5a5fd 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -106,11 +106,11 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
}
break;
case PCI_VENDOR_ID_NVIDIA:
+ switch (pdev->device) {
/* NVidia reports that certain chips don't handle
* QH, ITD, or SITD addresses above 2GB. (But TD,
* data buffer, and periodic schedule are normal.)
*/
- switch (pdev->device) {
case 0x003c: /* MCP04 */
case 0x005b: /* CK804 */
case 0x00d8: /* CK8 */
@@ -120,6 +120,14 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
ehci_warn(ehci, "can't enable NVidia "
"workaround for >2GB RAM\n");
break;
+ /* Some NForce2 chips have problems with selective suspend;
+ * fixed in newer silicon.
+ */
+ case 0x0068:
+ pci_read_config_dword(pdev, PCI_REVISION_ID, &temp);
+ if ((temp & 0xff) < 0xa4)
+ ehci->no_selective_suspend = 1;
+ break;
}
break;
}
@@ -163,6 +171,21 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
device_init_wakeup(&pdev->dev, 1);
}
+#ifdef CONFIG_USB_SUSPEND
+ /* REVISIT: the controller works fine for wakeup iff the root hub
+ * itself is "globally" suspended, but usbcore currently doesn't
+ * understand such things.
+ *
+ * System suspend currently expects to be able to suspend the entire
+ * device tree, device-at-a-time. If we failed selective suspend
+ * reports, system suspend would fail; so the root hub code must claim
+ * success. That's lying to usbcore, and it matters for for runtime
+ * PM scenarios with selective suspend and remote wakeup...
+ */
+ if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
+ ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
+#endif
+
retval = ehci_pci_reinit(ehci, pdev);
done:
return retval;
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 18e257c2bdb5..86af41c41de1 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -89,6 +89,8 @@ struct ehci_hcd { /* one per controller */
u32 command;
unsigned is_tdi_rh_tt:1; /* TDI roothub with TT */
+ unsigned no_selective_suspend:1;
+ u8 sbrn; /* packed release number */
/* irq statistics */
#ifdef EHCI_STATS
@@ -97,7 +99,6 @@ struct ehci_hcd { /* one per controller */
#else
# define COUNT(x) do {} while (0)
#endif
- u8 sbrn; /* packed release number */
};
/* convert between an HCD pointer and the corresponding EHCI_HCD */