From 85550f9148a852ed363a386577ad31b97b95dfb8 Mon Sep 17 00:00:00 2001 From: Jelle Martijn Kok Date: Tue, 21 Feb 2017 12:48:18 +0100 Subject: [PATCH] usb: ohci-at91: Do not drop unhandled USB suspend control requests In patch 2e2aa1bc7eff90ecm, USB suspend and wakeup control requests are passed to SFR_OHCIICR register. If a processor does not have such a register, this hub control request will be dropped. If no such a SFR register is available, all USB suspend control requests will now be processed using ohci_hub_control() (like before patch 2e2aa1bc7eff90ecm.) Tested on an Atmel AT91SAM9G20 with an on-board TI TUSB2046B hub chip If the last USB device is unplugged from the USB hub, the hub goes into sleep and will not wakeup when an USB devices is inserted. Fixes: 2e2aa1bc7eff90ec ("usb: ohci-at91: Forcibly suspend ports while USB suspend") Signed-off-by: Jelle Martijn Kok Tested-by: Wenyou Yang Cc: Wenyou Yang Cc: Alan Stern Cc: stable Acked-by: Nicolas Ferre Reviewed-by: Alexandre Belloni Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ohci-at91.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index 414e3c376dbb..5302f988e7e6 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -350,7 +350,7 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, case USB_PORT_FEAT_SUSPEND: dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n"); - if (valid_port(wIndex)) { + if (valid_port(wIndex) && ohci_at91->sfr_regmap) { ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1); return 0; @@ -393,7 +393,7 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, case USB_PORT_FEAT_SUSPEND: dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n"); - if (valid_port(wIndex)) { + if (valid_port(wIndex) && ohci_at91->sfr_regmap) { ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0); return 0; -- 2.11.0