Messages in this thread Patch in this message | | | Date | Mon, 19 Mar 2007 14:38:29 -0700 | From | Greg KH <> | Subject | [patch 10/31] EHCI: add delay to bus_resume before accessing ports |
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-stable review patch. If anyone has any objections, please let us know.
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From: Alan Stern <stern@rowland.harvard.edu>
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/usb/host/ehci-hub.c | 4 ++++ 1 file changed, 4 insertions(+)
--- 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_h /* 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--) { -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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