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usb: dwc3: Check controller type before setting speed

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DWC_usb3 speed can only be set up to SuperSpeed. Limit the setting to
SuperSpeed only should the value be higher. Otherwise, the controller
will read an invalid speed value and set the device to an incorrect
speed.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Thinh Nguyen 2018-03-16 15:35:57 -07:00 • committed by Felipe Balbi
parent 80b776340c
commit 2f3090c6a8
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/dwc3/gadget.c
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@ -2044,7 +2044,10 @@ static void dwc3_gadget_set_speed(struct usb_gadget *g,
reg |= DWC3_DCFG_SUPERSPEED;
break;
case USB_SPEED_SUPER_PLUS:
reg |= DWC3_DCFG_SUPERSPEED_PLUS;
if (dwc3_is_usb31(dwc))
reg |= DWC3_DCFG_SUPERSPEED_PLUS;
else
reg |= DWC3_DCFG_SUPERSPEED;
break;
default:
dev_err(dwc->dev, "invalid speed (%d)\n", speed);