在 2021/10/12 下午4:30, Yinbo Zhu 写道:
The usb states of ohci controller include UsbOperational, UsbReset,
UsbSuspend and UsbResume. Among them, only the UsbOperational state
supports launching the start-of-frame for host controller according
the ohci protocol spec, but in S3 and S4 (suspend to memory/suspend
to disk) press test procedure, it may happen that the start-of-
frame was launched in UsbSuspend status and cause ohci works failed
that the phenomenon was hc will allways reproduce the SoF interrupt
and consider that hc doesn't deal with the ed/td/done list in non-
UsbOperational, and this patch was to disable SoF interrupt in ohci
_rh_suspend so that it can fix ohci SoF abnormally interrupt issue.
Signed-off-by: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
---
Change in v5:
Move the key code change into ohci_rh_suspend.
Rework the commit log information.
drivers/usb/host/ohci-hub.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index f474f2f..80a0094 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -88,6 +88,8 @@ static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
msleep (8);
spin_lock_irq (&ohci->lock);
}
+ /* All ED unlinks should be finished, no need for SOF interrupts */
+ ohci_writel(ohci, OHCI_INTR_SF, &ohci->regs->intrdisable);
update_done_list(ohci);
ohci_work(ohci);
Hi Alan Stern,
I consider that autostop sometimes was '1' then and HC doesn't
stop deal with the ed/td/done list , then ohci_wok will called
start_ed_unlink and
start_ed_unlink will enable INTR_SF as follows, so I think add
above two line code after ohci_work it is more appropriate, Do you think so?
static void start_ed_unlink (struct ohci_hcd *ohci, struct ed *ed)
{
...
494 /* enable SOF interrupt */
495 ohci_writel (ohci, OHCI_INTR_SF,
&ohci->regs->intrstatus);
496 ohci_writel (ohci, OHCI_INTR_SF,
&ohci->regs->intrenable);
...
}
BRs,
Yinbo Zhu.
