USB: EHCI: fix remote-wakeup support for ARC/TDI core
This patch (as1147) fixes the remote-wakeup support for EHCI
controllers using the ARC/TDI "embedded-TT" core. These controllers
turn off the RESUME bit by themselves when a port resume is complete;
hence we need to keep separate track of which ports are suspended or
in the process of resuming.
The patch also makes a couple of small improvements in ehci_irq(),
replacing reads of the command register with the value already stored
in a local variable.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Thomas Reitmayr <treitmayr@devbase.at>
CC: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 740835b..218f966 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -236,10 +236,8 @@
temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
if (test_bit(i, &ehci->bus_suspended) &&
- (temp & PORT_SUSPEND)) {
- ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
+ (temp & PORT_SUSPEND))
temp |= PORT_RESUME;
- }
ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
}
i = HCS_N_PORTS (ehci->hcs_params);
@@ -482,10 +480,9 @@
* controller by the user.
*/
- if ((temp & mask) != 0
- || ((temp & PORT_RESUME) != 0
- && time_after_eq(jiffies,
- ehci->reset_done[i]))) {
+ if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
+ || (ehci->reset_done[i] && time_after_eq(
+ jiffies, ehci->reset_done[i]))) {
if (i < 7)
buf [0] |= 1 << (i + 1);
else
@@ -688,6 +685,7 @@
/* resume completed? */
else if (time_after_eq(jiffies,
ehci->reset_done[wIndex])) {
+ clear_bit(wIndex, &ehci->suspended_ports);
set_bit(wIndex, &ehci->port_c_suspend);
ehci->reset_done[wIndex] = 0;
@@ -734,6 +732,9 @@
ehci_readl(ehci, status_reg));
}
+ if (!(temp & (PORT_RESUME|PORT_RESET)))
+ ehci->reset_done[wIndex] = 0;
+
/* transfer dedicated ports to the companion hc */
if ((temp & PORT_CONNECT) &&
test_bit(wIndex, &ehci->companion_ports)) {
@@ -757,8 +758,17 @@
}
if (temp & PORT_PE)
status |= 1 << USB_PORT_FEAT_ENABLE;
- if (temp & (PORT_SUSPEND|PORT_RESUME))
+
+ /* maybe the port was unsuspended without our knowledge */
+ if (temp & (PORT_SUSPEND|PORT_RESUME)) {
status |= 1 << USB_PORT_FEAT_SUSPEND;
+ } else if (test_bit(wIndex, &ehci->suspended_ports)) {
+ clear_bit(wIndex, &ehci->suspended_ports);
+ ehci->reset_done[wIndex] = 0;
+ if (temp & PORT_PE)
+ set_bit(wIndex, &ehci->port_c_suspend);
+ }
+
if (temp & PORT_OC)
status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
if (temp & PORT_RESET)
@@ -803,6 +813,7 @@
|| (temp & PORT_RESET) != 0)
goto error;
ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
+ set_bit(wIndex, &ehci->suspended_ports);
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC (ehci->hcs_params))