From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 16 Oct 2007 11:23:58 -0400 (EDT)
Yes, with post status stuck at 0x111
No, there are no warning messages that trigger
My last patch was just fine, it timed out appropriately and warned the
user telling them exactly what event timed out.
I'm reposting it here for reference, this is getting silly:
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index bb9cc59..9149593 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -563,14 +563,19 @@ static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
u32 temp;
u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
u16 reset_done = now + PORT_RESET_MSEC;
+ int limit_1;
/* build a "continuous enough" reset signal, with up to
* 3msec gap between pulses. scheduler HZ==100 must work;
* this might need to be deadline-scheduled.
*/
- do {
+ limit_1 = 100;
+ while (--limit_1 >= 0) {
+ int limit_2;
+
/* spin until any current reset finishes */
- for (;;) {
+ limit_2 = PORT_RESET_HW_MSEC * 2;
+ while (--limit_2 >= 0) {
temp = ohci_readl (ohci, portstat);
/* handle e.g. CardBus eject */
if (temp == ~(u32)0)
@@ -579,6 +584,10 @@ static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
break;
udelay (500);
}
+ if (limit_2 < 0) {
+ ohci_warn(ohci, "Root port inner-loop reset timeout, "
+ "portstat[%08x]\n", temp);
+ }
if (!(temp & RH_PS_CCS))
break;
@@ -589,7 +598,14 @@ static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
ohci_writel (ohci, RH_PS_PRS, portstat);
msleep(PORT_RESET_HW_MSEC);
now = ohci_readl(ohci, &ohci->regs->fmnumber);
- } while (tick_before(now, reset_done));
+ if (!tick_before(now, reset_done))
+ break;
+ }
+ if (limit_1 < 0) {
+ ohci_warn(ohci, "Root port outer-loop reset timeout, "
+ "now[%04x] reset_done[%04x]\n",
+ now, reset_done);
+ }
/* caller synchronizes using PRSC */
return 0;
-
