diff options
| author | Jason Wessel <jason.wessel@windriver.com> | 2009-08-20 15:39:53 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-23 06:46:38 -0700 |
| commit | 917778267fbe67703ab7d5c6f0b7a05d4c3df485 (patch) | |
| tree | e63fe24a920a378dc3cde0c6b9db366526df36f8 /include/linux/usb | |
| parent | c9530948bc626c8b638015c0b32abb9615659ec6 (diff) | |
USB: ehci-dbgp: stability improvements and external re-init
This patch implements several changes:
1) Improve the capability to debug the dbgp driver
The dbgp_ehci_status() was added in a number of places to report
the critical ehci registers to diagnose the cause of a failure of
the ehci-dbgp driver.
2) Capability to survive the host controller initialization
The dbgp_external_startup(), dbgp_not_safe, and dbgp_phys_port were
added so as to allow the ehci-dbgp to re-initialize after the ehci
host controller is reset by the standard host controller driver.
This same routine is common for the early startup or
re-initialization.
This resulted in the need to move some of the initialization code
out of the __init section because the ehci driver has the
possibility to be loaded later on as a kernel module.
3) Stability improvements for device initialization
The device enumeration from 0 to 127 has the possibility to fail
the first time after a warm reset on some older EHCI debug
controllers. The enumeration will be tried up to 3 times to
account for this failure case.
The dbg_wait_until_complete() was changed to wait up to 250 ms
before failing which only comes into play during device
initialization. The maximum delay will never get hit during the
course of normal operation of the driver, unless the device got
unplugged or there was a ehci controller failure, in which case the
dbgp device driver will shut itself down.
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: dbrownell@users.sourceforge.net
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/ehci_def.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/usb/ehci_def.h b/include/linux/usb/ehci_def.h index 1deac2a7b12..07851e05d76 100644 --- a/include/linux/usb/ehci_def.h +++ b/include/linux/usb/ehci_def.h @@ -176,4 +176,9 @@ extern int __init early_dbgp_init(char *s); extern struct console early_dbgp_console; #endif /* CONFIG_EARLY_PRINTK_DBGP */ +#ifdef CONFIG_EARLY_PRINTK_DBGP +/* Call backs from ehci host driver to ehci debug driver */ +extern int dbgp_external_startup(void); +#endif + #endif /* __LINUX_USB_EHCI_DEF_H */ |