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Workaround for receiving Voice Calls using the E1750 dongle from

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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
This commit is contained in:
Hans Petter Selasky 2014-09-12 22:40:12 +00:00
parent 53bdd39b8a
commit b75ac2ba76
1 changed files with 14 additions and 3 deletions
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17
sys/dev/usb/serial/u3g.c
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@ -75,6 +75,8 @@ SYSCTL_INT(_hw_usb_u3g, OID_AUTO, debug, CTLFLAG_RW,
#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_config[U3G_N_TRANSFER] = {
.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, usb_error_t error)
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;