Date: Sat, 20 Sep 2014 07:59:34 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r271896 - stable/10/sys/dev/usb/serial Message-ID: <201409200759.s8K7xZEm046683@svn.freebsd.org>
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Author: hselasky Date: Sat Sep 20 07:59:34 2014 New Revision: 271896 URL: http://svnweb.freebsd.org/changeset/base/271896 Log: MFC r271492: 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. Approved by: re, gjb Modified: stable/10/sys/dev/usb/serial/u3g.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/usb/serial/u3g.c ============================================================================== --- stable/10/sys/dev/usb/serial/u3g.c Sat Sep 20 06:34:34 2014 (r271895) +++ stable/10/sys/dev/usb/serial/u3g.c Sat Sep 20 07:59:34 2014 (r271896) @@ -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 #define U3GSP_GPRS 0 #define U3GSP_EDGE 1 @@ -153,6 +155,7 @@ 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, }, @@ -1012,14 +1015,22 @@ 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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