diff options
| author |   Roger Quadros <rogerq@ti.com> | 2017-10-31 15:56:29 +0200 |
|---|---|---|
| committer |   Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-11-28 13:05:31 +0200 |
| commit | a4f0927ef588cf62bb864707261482c874352942 (patch) | |
| tree | 2bc9d7f51dadd89a053a99223bc5fa74c5b7c200 /drivers/usb | |
| parent | usb: gadget: allow to enable legacy drivers without USB_ETH (diff) | |
| download | linux-dev-a4f0927ef588cf62bb864707261482c874352942.tar.xz linux-dev-a4f0927ef588cf62bb864707261482c874352942.zip | |
usb: gadget: core: Fix ->udc_set_speed() speed handling
Currently UDC core calls ->udc_set_speed() with the speed parameter
containing the maximum speed supported by the gadget function
driver. This might very well be more than that supported by the
UDC controller driver.
Select the lesser of the 2 speeds so both UDC and gadget function
driver are operating within limits.
This fixes PHY Erratic errors and 2 second enumeration delay on
TI's AM437x platforms.
Fixes: 6099eca796ae ("usb: gadget: core: introduce ->udc_set_speed() method")
Cc: <stable@vger.kernel.org> # v4.13+
Reported-by: Dylan Howey <Dylan.Howey@tennantco.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/udc/core.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 61422d624ad0..93eff7dec2f5 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1069,8 +1069,12 @@ static inline void usb_gadget_udc_stop(struct usb_udc *udc) static inline void usb_gadget_udc_set_speed(struct usb_udc *udc, enum usb_device_speed speed) { - if (udc->gadget->ops->udc_set_speed) - udc->gadget->ops->udc_set_speed(udc->gadget, speed); + if (udc->gadget->ops->udc_set_speed) { + enum usb_device_speed s; + + s = min(speed, udc->gadget->max_speed); + udc->gadget->ops->udc_set_speed(udc->gadget, s); + } } /** |