Alan Stern wrote:
> What happens across a system suspend?
>
>
I assume you mean as a test case:
echo -n mem > /sys/power/state
The dbgp device goes away entirely, when used with
earlyprintk=dbgp,keep. But there is a way to fix it reasonably
easily. Perhaps you might ack this resume patch, if you agree?
Jason.
---
From: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Subject: [PATCH] ehci-dbgp,ehci: Allow dbpg to work with suspend/resume
In order for the dbgp driver to survive suspend/resume, on every ehci
resume operation the debug controller must get re-initialized.
Signed-off-by: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: dbrownell@xxxxxxxxxxxxxxxxxxxxx
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
---
drivers/usb/host/ehci-hub.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -204,6 +204,13 @@ static int ehci_bus_resume (struct usb_h
return -ESHUTDOWN;
}
+ if (unlikely(ehci->debug)) {
+ if (ehci->debug && !dbgp_reset_prep())
+ ehci->debug = NULL;
+ else
+ dbgp_external_startup();
+ }
+
/* Ideally and we've got a real resume here, and no port's power
* was lost. (For PCI, that means Vaux was maintained.) But we
* could instead be restoring a swsusp snapshot -- so that BIOS was
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