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| author | Alan Stern <stern@rowland.harvard.edu> | 2007-03-15 20:54:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-04-27 22:28:35 +0200 |
| commit | e198a31489146bb723fef179e5d1d18c8225f246 (patch) | |
| tree | 92e84cc04863e49e3ff96feef56c2c6eb0adca23 /drivers/usb/host/ehci-hub.c | |
| parent | USB: Allow autosuspend delay to equal 0 (diff) | |
| download | linux-e198a31489146bb723fef179e5d1d18c8225f246.tar.xz linux-e198a31489146bb723fef179e5d1d18c8225f246.zip | |
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>
Diffstat (limited to 'drivers/usb/host/ehci-hub.c')
| -rw-r--r-- | drivers/usb/host/ehci-hub.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 1813b7cac294..f4d301bc83b9 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--) { |