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usb: dwc3: gadget: Do link recovery for SS and SSP

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commit d0550cd20e upstream.

The controller always supports link recovery for device in SS and SSP.
Remove the speed limit check. Also, when the device is in RESUME or
RESET state, it means the controller received the resume/reset request.
The driver must send the link recovery to acknowledge the request. They
are valid states for the driver to send link recovery.

Fixes: 72246da40f ("usb: Introduce DesignWare USB3 DRD Driver")
Fixes: ee5cd41c91 ("usb: dwc3: Update speed checks for SuperSpeedPlus")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2020-01-31 16:25:50 -08:00 • committed by Greg Kroah-Hartman
commit 074e6e411a
1 changed files with 2 additions and 6 deletions
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8
drivers/usb/dwc3/gadget.c
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@ -1577,7 +1577,6 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
u32 reg;
u8 link_state;
u8 speed;
/*
* According to the Databook Remote wakeup request should
@ -1587,16 +1586,13 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
*/
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
speed = reg & DWC3_DSTS_CONNECTSPD;
if ((speed == DWC3_DSTS_SUPERSPEED) ||
(speed == DWC3_DSTS_SUPERSPEED_PLUS))
return 0;
link_state = DWC3_DSTS_USBLNKST(reg);
switch (link_state) {
case DWC3_LINK_STATE_RESET:
case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
case DWC3_LINK_STATE_RESUME:
break;
default:
return -EINVAL;