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authorAlan Stern <stern@rowland.harvard.edu>2008-10-06 11:25:53 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 14:41:03 -0700
commiteafe5b99f2135488b21cf17a262c54997c44f784 (patch)
tree648a1c93460c7ae9b12624989cb8aca21d789114 /drivers/usb/host
parent2da41d5f6c036e7a6e496a7e601a685f8b87acb0 (diff)
downloadlinux-eafe5b99f2135488b21cf17a262c54997c44f784.tar.bz2
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>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/ehci-hcd.c14
-rw-r--r--drivers/usb/host/ehci-hub.c27
-rw-r--r--drivers/usb/host/ehci.h2
3 files changed, 29 insertions, 14 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 358df2a6c396..d343afacb0b0 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -706,7 +706,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
pcd_status = status;
/* resume root hub? */
- if (!(ehci_readl(ehci, &ehci->regs->command) & CMD_RUN))
+ if (!(cmd & CMD_RUN))
usb_hcd_resume_root_hub(hcd);
while (i--) {
@@ -715,8 +715,11 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
if (pstatus & PORT_OWNER)
continue;
- if (!(pstatus & PORT_RESUME)
- || ehci->reset_done [i] != 0)
+ if (!(test_bit(i, &ehci->suspended_ports) &&
+ ((pstatus & PORT_RESUME) ||
+ !(pstatus & PORT_SUSPEND)) &&
+ (pstatus & PORT_PE) &&
+ ehci->reset_done[i] == 0))
continue;
/* start 20 msec resume signaling from this port,
@@ -731,9 +734,8 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
/* PCI errors [4.15.2.4] */
if (unlikely ((status & STS_FATAL) != 0)) {
- dbg_cmd (ehci, "fatal", ehci_readl(ehci,
- &ehci->regs->command));
- dbg_status (ehci, "fatal", status);
+ dbg_cmd(ehci, "fatal", cmd);
+ dbg_status(ehci, "fatal", status);
if (status & STS_HALT) {
ehci_err (ehci, "fatal error\n");
dead:
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 740835bb8575..218f9660d7ee 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -236,10 +236,8 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
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 @@ ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
* 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 @@ static int ehci_hub_control (
/* 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 @@ static int ehci_hub_control (
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 @@ static int ehci_hub_control (
}
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 @@ static int ehci_hub_control (
|| (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))
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index a6fd550b6903..b11798d17ae5 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -99,6 +99,8 @@ struct ehci_hcd { /* one per controller */
owned by the companion during a bus suspend */
unsigned long port_c_suspend; /* which ports have
the change-suspend feature turned on */
+ unsigned long suspended_ports; /* which ports are
+ suspended */
/* per-HC memory pools (could be per-bus, but ...) */
struct dma_pool *qh_pool; /* qh per active urb */