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usb: gadget: f_tcm: Increase bMaxBurst

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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>
Link: https://lore.kernel.org/r/9d6265db4d138e542f281988362bc4392b034d43.1733876548.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2024-12-11 00:32:19 +00:00 committed by Greg Kroah-Hartman
parent e577ae94cd
commit d0c188cd8d
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/gadget/function/f_tcm.c
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@ -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 = {