ChangeSet 1.1760.26.5, 2004/06/24 10:21:05-07:00, [EMAIL PROTECTED]
[PATCH] USB: EHCI IRQ tweaks
Various tweaks to EHCI IRQ handling, these may affact some systems.
- Delays enabling IRQs until the root hub is more fully set up, so
any "resume detect" IRQs can be handled properly. (Craig Nadler)
- Power down ports on driver shutdown. (Craig Nadler)
- Remove some duplicate irq-sharing logic that somehow crept in; check
only once, and return IRQ_NONE to detect IRQ storms better (db)
- Minor comment fix re integrated TTs. (db)
From: Craig Nadler <[EMAIL PROTECTED]>
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
drivers/usb/host/ehci-hcd.c | 29 ++++++++++++++++++-----------
1 files changed, 18 insertions(+), 11 deletions(-)
diff -Nru a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
--- a/drivers/usb/host/ehci-hcd.c 2004-06-29 16:26:32 -07:00
+++ b/drivers/usb/host/ehci-hcd.c 2004-06-29 16:26:32 -07:00
@@ -425,7 +425,6 @@
ehci_mem_cleanup (ehci);
return retval;
}
- writel (INTR_MASK, &ehci->regs->intr_enable);
writel (ehci->periodic_dma, &ehci->regs->frame_list);
#ifdef CONFIG_PCI
@@ -531,7 +530,8 @@
/*
* Start, enabling full USB 2.0 functionality ... usb 1.1 devices
* are explicitly handed to companion controller(s), so no TT is
- * involved with the root hub.
+ * involved with the root hub. (Except where one is integrated,
+ * and there's no companion controller unless maybe for USB OTG.)
*/
ehci->reboot_notifier.notifier_call = ehci_reboot;
register_reboot_notifier (&ehci->reboot_notifier);
@@ -563,6 +563,8 @@
goto done2;
}
+ writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */
+
create_debug_files (ehci);
return 0;
@@ -573,6 +575,7 @@
static void ehci_stop (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
+ u8 rh_ports, port;
ehci_dbg (ehci, "stop\n");
@@ -584,7 +587,16 @@
return;
}
del_timer_sync (&ehci->watchdog);
+
+ /* Turn off port power on all root hub ports. */
+ rh_ports = HCS_N_PORTS (ehci->hcs_params);
+ for (port = 1; port <= rh_ports; port++) {
+ ehci_hub_control(hcd, ClearPortFeature, USB_PORT_FEAT_POWER,
+ port, NULL, 0);
+ }
+
ehci_reset (ehci);
+ writel (0, &ehci->regs->intr_enable);
/* let companion controllers work when we aren't */
writel (0, &ehci->regs->configured_flag);
@@ -704,12 +716,6 @@
status = readl (&ehci->regs->status);
- /* shared irq */
- if (status == 0) {
- spin_unlock (&ehci->lock);
- return IRQ_NONE;
- }
-
/* e.g. cardbus physical eject */
if (status == ~(u32) 0) {
ehci_dbg (ehci, "device removed\n");
@@ -717,8 +723,10 @@
}
status &= INTR_MASK;
- if (!status) /* irq sharing? */
- goto done;
+ if (!status) { /* irq sharing? */
+ spin_unlock(&ehci->lock);
+ return IRQ_NONE;
+ }
/* clear (just) interrupts */
writel (status, &ehci->regs->status);
@@ -789,7 +797,6 @@
if (bh)
ehci_work (ehci, regs);
-done:
spin_unlock (&ehci->lock);
return IRQ_HANDLED;
}
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