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Commit cefab302 authored by Mayank Rana's avatar Mayank Rana
Browse files

usb: gadget: Use mult as 3 for GSI related USB IN endpoint always 



Interfaces like MBIM or ECM is having multiple data interfaces.
In this case, SET_CONFIG() happens before set_alt with data interface 1.
Due to this, TXFIFO of GSI IN endpoint is not resized causing low
throughput in DL direction. Fix this issue by using mult as 3 for
GSI related USB IN endpoint irrespective of super-speed or high-speed
mode.

CRs-Fixed: 1025031
Change-Id: I10de98ae57284699af3abcd90bafac63ba03844e
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
parent 520de144

drivers/usb/dwc3/gadget.c

+14 −2
Original line number Diff line number Diff line
@@ -226,9 +226,21 @@ int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc) 
		int		mult = 1;

		int		tmp;



		tmp = max_packet + mdwidth;

		/*

		 * Interfaces like MBIM or ECM is having multiple data

		 * interfaces. SET_CONFIG() happens before set_alt with

		 * data interface 1 which results into calling this API

		 * before GSI endpoint enabled. This results no txfifo

		 * resize with GSI endpoint causing low throughput. Hence

		 * use mult as 3 for GSI IN endpoint always irrespective

		 * USB speed.

		 */

		if (dep->endpoint.ep_type == EP_TYPE_GSI)

			mult = 3;



		if (!(dep->flags & DWC3_EP_ENABLED)) {

			dev_dbg(dwc->dev, "ep%dIn not enabled", num);

			tmp = max_packet + mdwidth;

			goto resize_fifo;

		}
@@ -237,8 +249,8 @@ int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc) 
				|| usb_endpoint_xfer_isoc(dep->endpoint.desc))

			mult = 3;



		tmp = mult * (max_packet + mdwidth);

resize_fifo:

		tmp *= mult;

		tmp += mdwidth;



		fifo_size = DIV_ROUND_UP(tmp, mdwidth);