[PATCH] usb: dwc3: gadget: Fix TX FIFO size for HS ISOC endpoints

[Akash Kumar]

Use 2K TX FIFO size for low-resolution UVC cameras to support the
maximum possible UVC instances. Restrict 2K TX FIFO size based on
the minimum maxburst required to run low-resolution UVC cameras.

Signed-off-by: Akash Kumar <quic_akakum@xxxxxxxxxxx>
---
 drivers/usb/dwc3/gadget.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 89fc690fdf34..f342ccda6705 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -788,6 +788,10 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
 	     usb_endpoint_xfer_isoc(dep->endpoint.desc)) && DWC3_IP_IS(DWC31))
 		num_fifos = dwc->tx_fifo_resize_max_num;
 
+	if (dep->endpoint.maxburst <= 1 &&
+	    usb_endpoint_xfer_isoc(dep->endpoint.desc))
+		num_fifos = 2;
+
 	/* FIFO size for a single buffer */
 	fifo = dwc3_gadget_calc_tx_fifo_size(dwc, 1);
 
-- 
2.17.1