Commit 28781789 authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: dwc3: gadget: read IN ep FIFO size from HW 



Instead of assuming all IN endpoints support 1024
bytes, let's read the actual value from HW and pass
that to gadget API.

Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 3c6aea73

drivers/usb/dwc3/gadget.c

+38 −0
Original line number Diff line number Diff line
@@ -1967,6 +1967,44 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc, 
			dep->endpoint.ops = &dwc3_gadget_ep0_ops;

			if (!epnum)

				dwc->gadget.ep0 = &dep->endpoint;

		} else if (direction) {

			int mdwidth;

			int size;

			int ret;

			int num;



			mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);

			/* MDWIDTH is represented in bits, we need it in bytes */

			mdwidth /= 8;



			size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(i));

			size = DWC3_GTXFIFOSIZ_TXFDEF(size);



			/* FIFO Depth is in MDWDITH bytes. Multiply */

			size *= mdwidth;



			num = size / 1024;

			if (num == 0)

				num = 1;



			/*

			 * FIFO sizes account an extra MDWIDTH * (num + 1) bytes for

			 * internal overhead. We don't really know how these are used,

			 * but documentation say it exists.

			 */

			size -= mdwidth * (num + 1);

			size /= num;



			usb_ep_set_maxpacket_limit(&dep->endpoint, size);



			dep->endpoint.max_streams = 15;

			dep->endpoint.ops = &dwc3_gadget_ep_ops;

			list_add_tail(&dep->endpoint.ep_list,

					&dwc->gadget.ep_list);



			ret = dwc3_alloc_trb_pool(dep);

			if (ret)

				return ret;

		} else {

			int		ret;