Author: hselasky
Date: Fri Sep 12 22:40:12 2014
New Revision: 271492
URL: http://svnweb.freebsd.org/changeset/base/271492
Log:
Workaround for receiving Voice Calls using the E1750 dongle from
Huawei. It might appear as if the firmware is allocating memory blocks
according to the USB transfer size and if there is initially a lot of
data, like at the answering machine prompt, it simply dies without any
apparent reason. The simple workaround for this is to force a zero
length packet at hardware level after every 512 bytes of data. This
will force the other side to use smaller memory blocks aswell.
MFC after: 1 week
Modified:
head/sys/dev/usb/serial/u3g.c
Modified: head/sys/dev/usb/serial/u3g.c
==============================================================================
--- head/sys/dev/usb/serial/u3g.c Fri Sep 12 22:20:07 2014
(r271491)
+++ head/sys/dev/usb/serial/u3g.c Fri Sep 12 22:40:12 2014
(r271492)
@@ -75,6 +75,8 @@ SYSCTL_INT(_hw_usb_u3g, OID_AUTO, debug,
#define U3G_MAXPORTS 12
#define U3G_CONFIG_INDEX 0
#define U3G_BSIZE 2048
+#define U3G_TXSIZE (U3G_BSIZE / U3G_TXFRAMES)
+#define U3G_TXFRAMES 4
/* Eject methods; See also usb_quirks.h:UQ_MSC_EJECT_* */
#define U3GINIT_HUAWEI 1 /* Requires Huawei init command
*/
@@ -145,6 +147,7 @@ static const struct usb_config u3g_confi
.endpoint = UE_ADDR_ANY,
.direction = UE_DIR_OUT,
.bufsize = U3G_BSIZE,/* bytes */
+ .frames = U3G_TXFRAMES,
.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
.callback = &u3g_write_callback,
},
@@ -1011,14 +1014,22 @@ u3g_write_callback(struct usb_xfer *xfer
struct ucom_softc *ucom = usbd_xfer_softc(xfer);
struct usb_page_cache *pc;
uint32_t actlen;
+ uint32_t frame;
switch (USB_GET_STATE(xfer)) {
case USB_ST_TRANSFERRED:
case USB_ST_SETUP:
tr_setup:
- pc = usbd_xfer_get_frame(xfer, 0);
- if (ucom_get_data(ucom, pc, 0, U3G_BSIZE, &actlen)) {
- usbd_xfer_set_frame_len(xfer, 0, actlen);
+ for (frame = 0; frame != U3G_TXFRAMES; frame++) {
+ usbd_xfer_set_frame_offset(xfer, frame * U3G_TXSIZE,
frame);
+
+ pc = usbd_xfer_get_frame(xfer, frame);
+ if (ucom_get_data(ucom, pc, 0, U3G_TXSIZE, &actlen) ==
0)
+ break;
+ usbd_xfer_set_frame_len(xfer, frame, actlen);
+ }
+ if (frame != 0) {
+ usbd_xfer_set_frames(xfer, frame);
usbd_transfer_submit(xfer);
}
break;
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