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 <chanho61.park@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 029cf06515643e7344e0f0e9ebc80be06a66237f..ba444e7f9c4448d4f7a2ba7305bd88379f1a35a4 100644 (file)
--- 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(&params, 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;