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authorJason Wessel <jason.wessel@windriver.com>2009-08-20 15:39:54 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 06:46:38 -0700
commit8d053c79f22462f55c02c8083580730b922cf7b4 (patch)
tree2b29c3219fec7cb622af6ffba69c8eb21650c662 /include/linux/usb
parent917778267fbe67703ab7d5c6f0b7a05d4c3df485 (diff)
USB: ehci-dbgp,ehci: Allow early or late use of the dbgp device
If the EHCI debug port is initialized and in use, the EHCI host controller driver must follow two rules. 1) If the EHCI host driver issues a controller reset, the debug controller driver re-initialization must get called after the reset is completed. 2) The EHCI host driver should ignore any requests to the physical EHCI debug port when the EHCI debug port is in use. The code to check for the debug port was moved from ehci_pci_reinit() to ehci_pci_setup because it must get called prior to ehci_reset() which will clear the debug port registers. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: dbrownell@users.sourceforge.net Cc: Ingo Molnar <mingo@elte.hu> Cc: Andrew Morton <akpm@linux-foundation.org> 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.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/usb/ehci_def.h b/include/linux/usb/ehci_def.h
index 07851e05d76..1909d924f81 100644
--- a/include/linux/usb/ehci_def.h
+++ b/include/linux/usb/ehci_def.h
@@ -179,6 +179,16 @@ extern struct console early_dbgp_console;
#ifdef CONFIG_EARLY_PRINTK_DBGP
/* Call backs from ehci host driver to ehci debug driver */
extern int dbgp_external_startup(void);
+extern int dbgp_reset_prep(void);
+#else
+static inline int dbgp_reset_prep(void)
+{
+ return 1;
+}
+static inline int dbgp_external_startup(void)
+{
+ return -1;
+}
#endif
#endif /* __LINUX_USB_EHCI_DEF_H */