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authorAlan Stern <stern@rowland.harvard.edu>2006-10-27 10:33:11 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-12-01 14:23:27 -0800
commit052ac01aeb84d8427ba8ac3d70991ac01b009b59 (patch)
treeb232d996dab32777156c4d9f661711e8a29aee86 /drivers/usb
parentb1878440d46a0dc357ed5c9687c534e20955e940 (diff)
USB: OHCI: disable RHSC inside interrupt handler
This patch (as808b) moves the Root Hub Status Change interrupt-disable code in ohci-hcd back into the interrupt handler proper, to avoid the chance of adverse interactions with mediocre hardware implementations. It also deletes the root-hub status timer from within the interrupt-enable routine. There's no need to poll for status any more once interrupts are re-enabled. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/ohci-hcd.c10
-rw-r--r--drivers/usb/host/ohci-hub.c24
2 files changed, 18 insertions, 16 deletions
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index ea4714e557e..a95275a401b 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -729,6 +729,16 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
ohci->next_statechange = jiffies + STATECHANGE_DELAY;
ohci_writel(ohci, OHCI_INTR_RD | OHCI_INTR_RHSC,
&regs->intrstatus);
+
+ /* NOTE: Vendors didn't always make the same implementation
+ * choices for RHSC. Many followed the spec; RHSC triggers
+ * on an edge, like setting and maybe clearing a port status
+ * change bit. With others it's level-triggered, active
+ * until khubd clears all the port status change bits. We'll
+ * always disable it here and rely on polling until khubd
+ * re-enables it.
+ */
+ ohci_writel(ohci, OHCI_INTR_RHSC, &regs->intrdisable);
usb_hcd_poll_rh_status(hcd);
}
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index 99357b99d13..1e5ed3bb1a9 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -41,7 +41,11 @@ static void ohci_rhsc_enable (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
- ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
+ spin_lock_irq(&ohci->lock);
+ if (!ohci->autostop)
+ del_timer(&hcd->rh_timer); /* Prevent next poll */
+ ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
+ spin_unlock_irq(&ohci->lock);
}
#define OHCI_SCHED_ENABLES \
@@ -348,7 +352,7 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int i, changed = 0, length = 1;
- int any_connected = 0, rhsc_enabled = 1;
+ int any_connected = 0;
unsigned long flags;
spin_lock_irqsave (&ohci->lock, flags);
@@ -389,19 +393,6 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
}
}
- /* NOTE: vendors didn't always make the same implementation
- * choices for RHSC. Sometimes it triggers on an edge (like
- * setting and maybe clearing a port status change bit); and
- * it's level-triggered on other silicon, active until khubd
- * clears all active port status change bits. If it's still
- * set (level-triggered) we must disable it and rely on
- * polling until khubd re-enables it.
- */
- if (ohci_readl (ohci, &ohci->regs->intrstatus) & OHCI_INTR_RHSC) {
- ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
- (void) ohci_readl (ohci, &ohci->regs->intrdisable);
- rhsc_enabled = 0;
- }
hcd->poll_rh = 1;
/* carry out appropriate state changes */
@@ -412,7 +403,8 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
* and RHSC is enabled */
if (!ohci->autostop) {
if (any_connected) {
- if (rhsc_enabled)
+ if (ohci_readl(ohci, &ohci->regs->intrenable) &
+ OHCI_INTR_RHSC)
hcd->poll_rh = 0;
} else {
ohci->autostop = 1;