On Mon, 30 Apr 2007, David Brownell wrote:
> No; track down that CMD_ASE/STS_ASS thing and I expect this
> problem will just vanish.
The patch below should help verify some of the assumptions in the driver.
If they turn out to be wrong then we'll know where to look. If they turn
out to be right... then we'll be no better off.
To test this, collect the dmesg log starting from before you plug in the
USB drive and ending several seconds later, when everything is idle.
Alan Stern
Index: usb-2.6/drivers/usb/host/ehci-q.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/ehci-q.c
+++ usb-2.6/drivers/usb/host/ehci-q.c
@@ -795,6 +795,7 @@ static void qh_link_async (struct ehci_h
/* in case a clear of CMD_ASE didn't take yet */
(void)handshake(ehci, &ehci->regs->status,
STS_ASS, 0, 150);
+printk("Start ASS: %x\n", ehci_readl(ehci, &ehci->regs->status) & STS_ASS);
cmd |= CMD_ASE | CMD_RUN;
ehci_writel(ehci, cmd, &ehci->regs->command);
ehci_to_hcd(ehci)->state = HC_STATE_RUNNING;
@@ -1026,6 +1027,7 @@ static void start_unlink_async (struct e
if (ehci_to_hcd(ehci)->state != HC_STATE_HALT
&& !ehci->reclaim) {
/* ... and CMD_IAAD clear */
+printk("End ASS: %x\n", ehci_readl(ehci, &ehci->regs->status) & STS_ASS);
ehci_writel(ehci, cmd & ~CMD_ASE,
&ehci->regs->command);
wmb ();
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