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Commit b2117739 authored by Channagoud Kadabi's avatar Channagoud Kadabi
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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
parent 26552565

fastboot/fastboot_protocol.txt

+2 −2
Original line number Original line Diff line number Diff line
@@ -12,8 +12,8 @@ Basic Requirements 
------------------

------------------





* Two bulk endpoints (in, out) are required

* Two bulk endpoints (in, out) are required

* Max packet size must be 64 bytes for full-speed and 512 bytes for 

* Max packet size must be 64 bytes for full-speed, 512 bytes for

  high-speed USB

  high-speed and 1024 bytes for Super Speed USB.

* The protocol is entirely host-driven and synchronous (unlike the

* The protocol is entirely host-driven and synchronous (unlike the

  multi-channel, bi-directional, asynchronous ADB protocol)

  multi-channel, bi-directional, asynchronous ADB protocol)

fastboot/protocol.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -216,7 +216,7 @@ int fb_download_data(usb_handle *usb, const void *data, unsigned size) 
    }

    }

}

}





#define USB_BUF_SIZE 512

#define USB_BUF_SIZE 1024

static char usb_buf[USB_BUF_SIZE];

static char usb_buf[USB_BUF_SIZE];

static int usb_buf_len;

static int usb_buf_len;