On Sat, 29 Oct 2011, Anton Alekseev wrote:
> Hi. I've applied your patch to ehci-pci.c and results are the same.
> Can you advise me what to check next?
This patch increases the delay time to 2 ms and adds some debugging
log entries. Be sure that CONFIG_PRINTK_TIME is turned on, and post
the dmesg from your test with both patches applied.
Alan Stern
Index: usb-3.1/drivers/usb/host/ehci-sched.c
===================================================================
--- usb-3.1.orig/drivers/usb/host/ehci-sched.c
+++ usb-3.1/drivers/usb/host/ehci-sched.c
@@ -492,6 +492,7 @@ static int enable_periodic (struct ehci_
*/
status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
STS_PSS, 0, 9 * 125);
+ehci_info(ehci, "enable periodic %d\n", status);
if (status) {
usb_hc_died(ehci_to_hcd(ehci));
return status;
@@ -517,9 +518,10 @@ static int disable_periodic (struct ehci
if (--ehci->periodic_sched)
return 0;
+ehci_info(ehci, "start disable periodic\n");
if (unlikely(ehci->broken_periodic)) {
/* delay experimentally determined */
- ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
+ ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 2000);
ktime_t now = ktime_get_real();
s64 delay = ktime_us_delta(safe, now);
@@ -532,6 +534,7 @@ static int disable_periodic (struct ehci
*/
status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
STS_PSS, STS_PSS, 9 * 125);
+ehci_info(ehci, "disable periodic %d\n", status);
if (status) {
usb_hc_died(ehci_to_hcd(ehci));
return status;
--
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