overlay-beaglebone/sys-kernel/kernel-beaglebone-4_4/files/0009-usb-musb-enable-double-buffering-on-the-gadget-port.patch

From fcdf80367f7f00e1e642e1443d29c22be4f5f5d4 Mon Sep 17 00:00:00 2001
From: Victor Dodon <printesoi@chromium.org>
Date: Wed, 27 Apr 2016 10:15:03 -0700
Subject: [PATCH 9/9] usb: musb: enable double-buffering on the gadget port

---
 drivers/usb/musb/musb_core.c | 39 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index ee9ff70..d06eaf2 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1205,6 +1205,36 @@ static struct musb_fifo_cfg mode_4_cfg[] = {
 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
 };
 
+static struct musb_fifo_cfg mode_4_gadget_cfg[] = {
+{ .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
+{ .hw_ep_num =  1, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
+{ .hw_ep_num =  2, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
+{ .hw_ep_num =  2, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
+{ .hw_ep_num =  3, .style = FIFO_TX,   .maxpacket = 512, },
+{ .hw_ep_num =  3, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num =  4, .style = FIFO_TX,   .maxpacket = 512, },
+{ .hw_ep_num =  4, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num =  5, .style = FIFO_TX,   .maxpacket = 512, },
+{ .hw_ep_num =  5, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num =  6, .style = FIFO_TX,   .maxpacket = 512, },
+{ .hw_ep_num =  6, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num =  7, .style = FIFO_TX,   .maxpacket = 512, },
+{ .hw_ep_num =  7, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num =  8, .style = FIFO_TX,   .maxpacket = 512, },
+{ .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 512, },
+{ .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 256, },
+{ .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 64, },
+{ .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 256, },
+{ .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 64, },
+{ .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 256, },
+{ .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 64, },
+{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 2096, },
+{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
+{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
+};
+
 /* mode 5 - fits in 8KB */
 static struct musb_fifo_cfg mode_5_cfg[] = {
 { .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, },
@@ -1351,8 +1381,13 @@ static int ep_config_from_table(struct musb *musb)
 		n = ARRAY_SIZE(mode_3_cfg);
 		break;
 	case 4:
-		cfg = mode_4_cfg;
-		n = ARRAY_SIZE(mode_4_cfg);
+		if (musb->port_mode == MUSB_PORT_MODE_GADGET) {
+			cfg = mode_4_gadget_cfg;
+			n = ARRAY_SIZE(mode_4_gadget_cfg);
+		} else {
+			cfg = mode_4_cfg;
+			n = ARRAY_SIZE(mode_4_cfg);
+		}
 		break;
 	case 5:
 		cfg = mode_5_cfg;
-- 
2.8.0.rc3.226.g39d4020