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USB: gadget: mtp: Add module parameter for Rx transfer length

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The Rx request transfer length is 16K bytes by default.  The test
results indicate that larger transfers improve write speeds.  Add
provision for specifying Rx transfer length at runtime.

echo -n 1048576 > /sys/module/g_android/parameters/mtp_rx_req_len

The above command can be used to set Rx transfer length to 1MB.  If
the memory allocation is failed, fallback to the default length.

Change-Id: I74d5da09437c25e9f1772f7cd49aecb8e4fedcf2
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
This commit is contained in:
Hemant Kumar 2016-05-01 17:35:36 -07:00 • committed by Kyle Yan
parent f5bf2e9314
commit 1bb8887af8
1 changed files with 26 additions and 6 deletions
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32
drivers/usb/gadget/function/f_mtp.c
View file

@ -73,6 +73,9 @@
#define MTP_RESPONSE_DEVICE_BUSY 0x2019
#define DRIVER_NAME "mtp"
unsigned int mtp_rx_req_len = MTP_BULK_BUFFER_SIZE;
module_param(mtp_rx_req_len, uint, S_IRUGO | S_IWUSR);
static const char mtp_shortname[] = DRIVER_NAME "_usb";
struct mtp_dev {
@ -450,10 +453,27 @@ static int mtp_create_bulk_endpoints(struct mtp_dev *dev,
req->complete = mtp_complete_in;
mtp_req_put(dev, &dev->tx_idle, req);
}
/*
* The RX buffer should be aligned to EP max packet for
* some controllers. At bind time, we don't know the
* operational speed. Hence assuming super speed max
* packet size.
*/
if (mtp_rx_req_len % 1024)
mtp_rx_req_len = MTP_BULK_BUFFER_SIZE;
retry_rx_alloc:
for (i = 0; i < RX_REQ_MAX; i++) {
req = mtp_request_new(dev->ep_out, MTP_BULK_BUFFER_SIZE);
if (!req)
goto fail;
req = mtp_request_new(dev->ep_out, mtp_rx_req_len);
if (!req) {
if (mtp_rx_req_len <= MTP_BULK_BUFFER_SIZE)
goto fail;
for (; i > 0; i--)
mtp_request_free(dev->rx_req[i], dev->ep_out);
mtp_rx_req_len = MTP_BULK_BUFFER_SIZE;
goto retry_rx_alloc;
}
req->complete = mtp_complete_out;
dev->rx_req[i] = req;
}
@ -483,7 +503,7 @@ static ssize_t mtp_read(struct file *fp, char __user *buf,
DBG(cdev, "mtp_read(%zu)\n", count);
if (count > MTP_BULK_BUFFER_SIZE)
if (count > mtp_rx_req_len)
return -EINVAL;
if (!IS_ALIGNED(count, dev->ep_out->maxpacket))
@ -511,7 +531,7 @@ static ssize_t mtp_read(struct file *fp, char __user *buf,
requeue_req:
/* queue a request */
req = dev->rx_req[0];
req->length = MTP_BULK_BUFFER_SIZE;
req->length = mtp_rx_req_len;
dev->rx_done = 0;
ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
if (ret < 0) {
@ -787,7 +807,7 @@ static void receive_file_work(struct work_struct *data)
cur_buf = (cur_buf + 1) % RX_REQ_MAX;
/* some h/w expects size to be aligned to ep's MTU */
read_req->length = MTP_BULK_BUFFER_SIZE;
read_req->length = mtp_rx_req_len;
dev->rx_done = 0;
ret = usb_ep_queue(dev->ep_out, read_req, GFP_KERNEL);