Author: hselasky
Date: Sun Nov 11 12:33:16 2018
New Revision: 340351
URL: https://svnweb.freebsd.org/changeset/base/340351
Log:
MFC r340248:
Don't read the USB audio sync endpoint when we don't use it to save
isochronous bandwidth.
Sponsored by: Mellanox Technologies
Modified:
stable/11/sys/dev/sound/usb/uaudio.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/dev/sound/usb/uaudio.c
==============================================================================
--- stable/11/sys/dev/sound/usb/uaudio.c Sun Nov 11 12:31:27 2018
(r340350)
+++ stable/11/sys/dev/sound/usb/uaudio.c Sun Nov 11 12:33:16 2018
(r340351)
@@ -98,7 +98,7 @@ static int uaudio_default_channels = 0; /* use
defaul
static int uaudio_buffer_ms = 8;
#ifdef USB_DEBUG
-static int uaudio_debug = 0;
+static int uaudio_debug;
static SYSCTL_NODE(_hw_usb, OID_AUTO, uaudio, CTLFLAG_RW, 0, "USB uaudio");
@@ -134,6 +134,8 @@ uaudio_buffer_ms_sysctl(SYSCTL_HANDLER_ARGS)
SYSCTL_PROC(_hw_usb_uaudio, OID_AUTO, buffer_ms, CTLTYPE_INT | CTLFLAG_RWTUN,
0, sizeof(int), uaudio_buffer_ms_sysctl, "I",
"uaudio buffering delay from 2ms to 8ms");
+#else
+#define uaudio_debug 0
#endif
#define UAUDIO_NFRAMES 64 /* must be factor of 8 due
HS-USB */
@@ -2159,6 +2161,14 @@ uaudio_chan_play_sync_callback(struct usb_xfer *xfer,
break;
case USB_ST_SETUP:
+ /*
+ * Check if the recording stream can be used as a
+ * source of jitter information to save some
+ * isochronous bandwidth:
+ */
+ if (ch->priv_sc->sc_rec_chan.num_alt != 0 &&
+ uaudio_debug == 0)
+ break;
usbd_xfer_set_frames(xfer, 1);
usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_framelen(xfer));
usbd_transfer_submit(xfer);
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