From: Alan Stern Date: Thu, 15 Mar 2007 19:54:30 +0000 (-0400) Subject: EHCI: add delay to bus_resume before accessing ports X-Git-Tag: v2.6.22-rc1~1117^2~55 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e198a31489146bb723fef179e5d1d18c8225f246;p=platform%2Fkernel%2Flinux-exynos.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 Cc: David Brownell Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 1813b7ca..f4d301b 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--) {