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authorAlan Stern <stern@rowland.harvard.edu>2007-03-15 15:54:30 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-04-27 13:28:35 -0700
commite198a31489146bb723fef179e5d1d18c8225f246 (patch)
tree92e84cc04863e49e3ff96feef56c2c6eb0adca23
parenteaafbc3a8adab16babe2c20e54ad3ba40d1fbbc9 (diff)
EHCI: add delay to bus_resume before accessing ports
This patch (as870) adds a delay to ehci-hcd's bus_resume routine. Apparently there are controllers and/or BIOSes out there which need such a delay to get the ports back into their correct state. This fixes Bugzilla #8190. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/host/ehci-hub.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 1813b7cac29..f4d301bc83b 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -136,6 +136,10 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
/* restore CMD_RUN, framelist size, and irq threshold */
ehci_writel(ehci, ehci->command, &ehci->regs->command);
+ /* Some controller/firmware combinations need a delay during which
+ * they set up the port statuses. See Bugzilla #8190. */
+ mdelay(8);
+
/* manually resume the ports we suspended during bus_suspend() */
i = HCS_N_PORTS (ehci->hcs_params);
while (i--) {