Am Dienstag, 17. November 2009 17:10:10 schrieb Alan Stern:
> I'd like it if there was also some way to move the delay into
> disable_periodic(), before the handshake_on_error_set_halt(), and have
> it take effect only if the most recent enable_periodic() call occurred
> less than 400 us previously. Can you do it that way?
Sure.
Does anybody have a list of affected PCI ids?
Regards
Oliver
--
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 9835e07..ebdfc93 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -676,6 +676,7 @@ static int ehci_run (struct usb_hcd *hcd)
ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
msleep(5);
up_write(&ehci_cf_port_reset_rwsem);
+ ehci->last_periodic_disable = jiffies;
temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
ehci_info (ehci,
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index b25cdea..586e901 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -459,6 +459,10 @@ static int enable_periodic (struct ehci_hcd *ehci)
if (ehci->periodic_sched++)
return 0;
+ if (ehci->broken_periodic)
+ if (time_before(jiffies, ehci->last_periodic_disable +
msecs_to_jiffies(2))
+ mdelay(500);
+
/* did clearing PSE did take effect yet?
* takes effect only at frame boundaries...
*/
@@ -499,6 +503,7 @@ static int disable_periodic (struct ehci_hcd *ehci)
/* posted write ... */
ehci->next_uframe = -1;
+ ehci->last_periodic_disable = jiffies;
return 0;
}
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 064e768..ce77f8f 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -118,6 +118,7 @@ struct ehci_hcd { /* one per controller */
unsigned stamp;
unsigned random_frame;
unsigned long next_statechange;
+ unsigned long last_periodic_disable;
u32 command;
/* SILICON QUIRKS */
@@ -127,6 +128,7 @@ struct ehci_hcd { /* one per controller */
unsigned big_endian_desc:1;
unsigned has_amcc_usb23:1;
unsigned need_io_watchdog:1;
+ unsigned broken_periodic:1;
/* required for usb32 quirk */
#define OHCI_CTRL_HCFS (3 << 6)
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