From d2e9a13a388304bc2a7b25a6c34c6e2ab1540a5d Mon Sep 17 00:00:00 2001 From: Chanho Park Date: Fri, 31 Aug 2012 16:54:07 +0900 Subject: [PATCH] usb: dwc3: set up burst size only superspeed mode When connection is established non-ss mode, endpoint.maxburst is correctly set to 0, this means that current code will set maxburst bitfield on DEPCFG's parameter 0 to the highest possible value (0x0f) which is wrong. Even though this hasn't caused any issues so far (HW seems to ignore that when not running in SS mode) we want to make sure maxburst bitfield is only set to anything other than zero if we're running on SuperSpeed mode. In order to achieve that, let's check for gadget's operating speed before setting maxburst bitfield when issuing DEPCFG command. [ balbi@ti.com : improved commit log a bit in order to clarify the situation ] Signed-off-by: Chanho Park Signed-off-by: Kyungmin Park Signed-off-by: Felipe Balbi --- drivers/usb/dwc3/gadget.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 029cf06..ba444e7 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -439,8 +439,14 @@ static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep, memset(¶ms, 0x00, sizeof(params)); params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc)) - | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc)) - | DWC3_DEPCFG_BURST_SIZE(dep->endpoint.maxburst - 1); + | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc)); + + /* Burst size is only needed in SuperSpeed mode */ + if (dwc->gadget.speed == USB_SPEED_SUPER) { + u32 burst = dep->endpoint.maxburst - 1; + + params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst); + } if (ignore) params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM; -- 2.7.4