diff mbox series

[v3,08/28] usb: gadget: f_tcm: Increase bMaxBurst

Message ID 9d6265db4d138e542f281988362bc4392b034d43.1733876548.git.Thinh.Nguyen@synopsys.com (mailing list archive)
State New
Headers show
Series [v3,01/28] usb: gadget: f_tcm: Don't free command immediately | expand

Commit Message

Thinh Nguyen Dec. 11, 2024, 12:32 a.m. UTC 
Currently the default bMaxBurst is 0. Set default bMaxBurst to 15 (i.e.
16 bursts) to Data IN and OUT endpoints to improve performance. It
should be fine for a controller that supports less than 16 bursts. It
should be able to negotiate properly with the host at packet level for
the end of burst.

If the controller can't handle a burst of 16, and high performance isn't
important, the user can use BOT protocol from mass_storage gadget driver
instead.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
---
 drivers/usb/gadget/function/f_tcm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c
index 4fd56ae056a3..1c93f07daa7b 100644
--- a/drivers/usb/gadget/function/f_tcm.c
+++ b/drivers/usb/gadget/function/f_tcm.c
@@ -1724,7 +1724,7 @@  static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
 	.bLength =		sizeof(uasp_bi_ep_comp_desc),
 	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
-	.bMaxBurst =		0,
+	.bMaxBurst =		15,
 	.bmAttributes =		UASP_SS_EP_COMP_LOG_STREAMS,
 	.wBytesPerInterval =	0,
 };
@@ -1732,7 +1732,7 @@  static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
 	.bLength =		sizeof(bot_bi_ep_comp_desc),
 	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
-	.bMaxBurst =		0,
+	.bMaxBurst =		15,
 };
 
 static struct usb_endpoint_descriptor uasp_bo_desc = {
@@ -1767,12 +1767,14 @@  static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
 	.bLength =		sizeof(uasp_bo_ep_comp_desc),
 	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
+	.bMaxBurst =		15,
 	.bmAttributes =		UASP_SS_EP_COMP_LOG_STREAMS,
 };
 
 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
 	.bLength =		sizeof(bot_bo_ep_comp_desc),
 	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
+	.bMaxBurst =		15,
 };
 
 static struct usb_endpoint_descriptor uasp_status_desc = {