linux-kernel - [PATCH] usb: dwc3: gadget: increase tx fifo size for ss isoc endpoints

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Date:   Wed, 20 Apr 2022 13:33:38 -0500
From:   Dan Vacura <w36195@...orola.com>
To:     linux-usb@...r.kernel.org
Cc:     Wesley Cheng <wcheng@...eaurora.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Dan Vacura <w36195@...orola.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: dwc3: gadget: increase tx fifo size for ss isoc endpoints

Improve performance of isoc transfers in superspeed by increasing the
number of possible endpoints available, matching that of what was
configured for bulk transfers.

Signed-off-by: Dan Vacura <w36195@...orola.com>
---
 drivers/usb/dwc3/gadget.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index ab725d2262d6..faffa4f4050c 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -783,7 +783,8 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
 		num_fifos = 3;
 
 	if (dep->endpoint.maxburst > 6 &&
-	    usb_endpoint_xfer_bulk(dep->endpoint.desc) && DWC3_IP_IS(DWC31))
+	    (usb_endpoint_xfer_bulk(dep->endpoint.desc) ||
+	     usb_endpoint_xfer_isoc(dep->endpoint.desc)) && DWC3_IP_IS(DWC31))
 		num_fifos = dwc->tx_fifo_resize_max_num;
 
 	/* FIFO size for a single buffer */
-- 
2.32.0