From: Vikram Pandita <vikram.pandita@xxxxxx>
For function ehci_bus_resume()
- Added flag resume_needed
No need to wait for 20ms if no port was suspended
- Change mdelay to msleep
- release and reacquire the spinlock around mdelay
Signed-off-by: vikram pandita <vikram.pandita@xxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/host/ehci-hub.c | 18 +++++++++++++++---
1 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 218f966..3865070 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -194,6 +194,7 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
u32 temp;
u32 power_okay;
int i;
+ u8 resume_needed = 0;
if (time_before (jiffies, ehci->next_statechange))
msleep(5);
@@ -228,7 +229,9 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
/* Some controller/firmware combinations need a delay during which
* they set up the port statuses. See Bugzilla #8190. */
- mdelay(8);
+ spin_unlock_irq(&ehci->lock);
+ msleep(8);
+ spin_lock_irq(&ehci->lock);
/* manually resume the ports we suspended during bus_suspend() */
i = HCS_N_PORTS (ehci->hcs_params);
@@ -236,12 +239,21 @@ 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))
+ (temp & PORT_SUSPEND)) {
temp |= PORT_RESUME;
+ resume_needed = 1;
+ }
ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
}
+
+ /* msleep for 20ms only if code is trying to resume port */
+ if (resume_needed) {
+ spin_unlock_irq(&ehci->lock);
+ msleep(20);
+ spin_lock_irq(&ehci->lock);
+ }
+
i = HCS_N_PORTS (ehci->hcs_params);
- mdelay (20);
while (i--) {
temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
if (test_bit(i, &ehci->bus_suspended) &&
--
1.6.0.4
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