[PATCH v2] usb: gadget: u_serial: improve performance for large data
From: Macpaul Lin <macpaul.lin@mediatek.com>
Date: 2020-06-17 02:47:03
Also in:
linux-arm-kernel, linux-mediatek, lkml
Subsystem:
the rest, usb subsystem · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
Nowadays some embedded systems use VCOM to transfer large log and data. Take LTE MODEM as an example, during the long debugging stage, large log and data were transfer through VCOM when doing field try or in operator's lab. Here we suggest slightly increase the transfer buffer in u_serial.c for performance improving. Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> --- drivers/usb/gadget/function/u_serial.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index 3cfc6e2..d7912a9 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c@@ -80,6 +80,7 @@ #define QUEUE_SIZE 16 #define WRITE_BUF_SIZE 8192 /* TX only */ #define GS_CONSOLE_BUF_SIZE 8192 +#define REQ_BUF_SIZE 4096 /* console info */ struct gs_console {
@@ -247,7 +248,7 @@ static int gs_start_tx(struct gs_port *port) break; req = list_entry(pool->next, struct usb_request, list); - len = gs_send_packet(port, req->buf, in->maxpacket); + len = gs_send_packet(port, req->buf, REQ_BUF_SIZE); if (len == 0) { wake_up_interruptible(&port->drain_wait); break;
@@ -514,7 +515,7 @@ static int gs_alloc_requests(struct usb_ep *ep, struct list_head *head, * be as speedy as we might otherwise be. */ for (i = 0; i < n; i++) { - req = gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC); + req = gs_alloc_req(ep, REQ_BUF_SIZE, GFP_ATOMIC); if (!req) return list_empty(head) ? -ENOMEM : 0; req->complete = fn;
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1.7.9.5