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ANDROID: usb: gadget: f_accessory: Increase buffer size and max burst

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Requests begin with large buffers for performance, and
the buffers are halved if allocation fails.

Bug: 67683483
Change-Id: I63d9f18385ca8e86894fd75d80c1702ee3e4e25f
Signed-off-by: Jerry Zhang <zhangjerry@google.com>
This commit is contained in:
Jerry Zhang 2017-10-11 11:26:43 -07:00 • committed by Timi
parent f634019867
commit 4b0f74a70e
1 changed files with 31 additions and 12 deletions
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43
drivers/usb/gadget/function/f_accessory.c
View file

@ -44,6 +44,7 @@
#define MAX_INST_NAME_LEN 40
#define BULK_BUFFER_SIZE 16384
#define BULK_BUFFER_INIT_SIZE 131072
#define ACC_STRING_SIZE 256
#define PROTOCOL_VERSION 2
@ -55,6 +56,9 @@
#define TX_REQ_MAX 4
#define RX_REQ_MAX 2
unsigned int acc_rx_req_len = BULK_BUFFER_INIT_SIZE;
unsigned int acc_tx_req_len = BULK_BUFFER_INIT_SIZE;
struct acc_hid_dev {
struct list_head list;
struct hid_device *hid;
@ -153,7 +157,7 @@ static struct usb_ss_ep_comp_descriptor acc_superspeed_in_comp_desc = {
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
/* the following 2 values can be tweaked if necessary */
/* .bMaxBurst = 0, */
.bMaxBurst = 8,
/* .bmAttributes = 0, */
};
@ -170,7 +174,7 @@ static struct usb_ss_ep_comp_descriptor acc_superspeed_out_comp_desc = {
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
/* the following 2 values can be tweaked if necessary */
/* .bMaxBurst = 0, */
.bMaxBurst = 8,
/* .bmAttributes = 0, */
};
@ -584,18 +588,33 @@ static int create_bulk_endpoints(struct acc_dev *dev,
ep->driver_data = dev; /* claim the endpoint */
dev->ep_out = ep;
retry_tx_alloc:
/* now allocate requests for our endpoints */
for (i = 0; i < TX_REQ_MAX; i++) {
req = acc_request_new(dev->ep_in, BULK_BUFFER_SIZE);
if (!req)
goto fail;
req = acc_request_new(dev->ep_in, acc_tx_req_len);
if (!req) {
if (acc_tx_req_len <= BULK_BUFFER_SIZE)
goto fail;
while ((req = req_get(dev, &dev->tx_idle)))
acc_request_free(req, dev->ep_in);
acc_tx_req_len /= 2;
goto retry_tx_alloc;
}
req->complete = acc_complete_in;
req_put(dev, &dev->tx_idle, req);
}
retry_rx_alloc:
for (i = 0; i < RX_REQ_MAX; i++) {
req = acc_request_new(dev->ep_out, BULK_BUFFER_SIZE);
if (!req)
goto fail;
req = acc_request_new(dev->ep_out, acc_rx_req_len);
if (!req) {
if (acc_rx_req_len <= BULK_BUFFER_SIZE)
goto fail;
for (i = 0; i < RX_REQ_MAX; i++)
acc_request_free(dev->rx_req[i], dev->ep_out);
acc_rx_req_len /= 2;
goto retry_rx_alloc;
}
req->complete = acc_complete_out;
dev->rx_req[i] = req;
}
@ -626,8 +645,8 @@ static ssize_t acc_read(struct file *fp, char __user *buf,
return -ENODEV;
}
if (count > BULK_BUFFER_SIZE)
count = BULK_BUFFER_SIZE;
if (count > acc_rx_req_len)
count = acc_rx_req_len;
/* we will block until we're online */
pr_debug("acc_read: waiting for online\n");
@ -723,8 +742,8 @@ static ssize_t acc_write(struct file *fp, const char __user *buf,
break;
}
if (count > BULK_BUFFER_SIZE) {
xfer = BULK_BUFFER_SIZE;
if (count > acc_tx_req_len) {
xfer = acc_tx_req_len;
/* ZLP, They will be more TX requests so not yet. */
req->zero = 0;
} else {