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authorVikram Pandita <vikram.pandita@ti.com>2008-10-24 23:41:30 +0530
committerGreg Kroah-Hartman <gregkh@suse.de>2009-01-07 09:59:50 -0800
commit3a4e72cbf2ac4435630a2b03bd25e60ef5967e99 (patch)
tree9e52159e2e759cd0b31ad1c67c6c85da1a08075c /drivers/usb/host
parent8e8ce4b642ce4beb865fb1d67cd8ea883d9ae7d7 (diff)
USB: Avoid 20ms delay in EHCI resume
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@ti.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/ehci-hub.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 218f9660d7e..38650707dfe 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) &&