From: Alan Stern Date: Fri, 16 Mar 2007 13:34:29 +0000 (-0400) Subject: EHCI: add delay to bus_resume before accessing ports X-Git-Tag: v2.6.20.4~25 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38d4f86736e5dd71a748f87b20d66a8cf2357454;p=thirdparty%2Fkernel%2Fstable.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index bfe5f307cba68..2d36a8deb2e61 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -134,6 +134,10 @@ static int ehci_bus_resume (struct usb_hcd *hcd) /* restore CMD_RUN, framelist size, and irq threshold */ writel (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--) {