system: core: fastboot: Increase USB protocol buffer size to 1024
With USB3.0 SS support the max packet size supported by USB protocol
is 1024 bytes. When connected to a USB device in SuperSpeed, if only
512 bytes are sent at a time the device would interpret each transfer
as a short packet and slows down overall throughput. To accommodate
for SuperSpeed USB bulk endpoints, increase the buffer size to 1024.
Change-Id: I4f447fe38045bc0008e2d6dd3f36c2d6819d6c15
diff --git a/fastboot/fastboot_protocol.txt b/fastboot/fastboot_protocol.txt
index 2248992..37b1959 100644
--- a/fastboot/fastboot_protocol.txt
+++ b/fastboot/fastboot_protocol.txt
@@ -12,8 +12,8 @@
------------------
* Two bulk endpoints (in, out) are required
-* Max packet size must be 64 bytes for full-speed and 512 bytes for
- high-speed USB
+* Max packet size must be 64 bytes for full-speed, 512 bytes for
+ high-speed and 1024 bytes for Super Speed USB.
* The protocol is entirely host-driven and synchronous (unlike the
multi-channel, bi-directional, asynchronous ADB protocol)
diff --git a/fastboot/protocol.c b/fastboot/protocol.c
index 84e9837..10a84c1 100644
--- a/fastboot/protocol.c
+++ b/fastboot/protocol.c
@@ -216,7 +216,7 @@
}
}
-#define USB_BUF_SIZE 512
+#define USB_BUF_SIZE 1024
static char usb_buf[USB_BUF_SIZE];
static int usb_buf_len;