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Index: head/sys/dev/usb/serial/uftdi.c
===================================================================
--- head/sys/dev/usb/serial/uftdi.c
+++ head/sys/dev/usb/serial/uftdi.c
@@ -1123,6 +1123,9 @@
FTDI_SIO_SET_DATA_PARITY_NONE |
FTDI_SIO_SET_DATA_BITS(8));
+ /* Indicate tx bits in sc_lsr can be used to determine busy vs idle. */
+ ucom_use_lsr_txbits(&sc->sc_ucom);
+
error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
&uftdi_callback, &sc->sc_mtx);
if (error) {
@@ -1279,16 +1282,20 @@
offset = 0;
/*
* Extract packet headers and payload bytes from the buffer.
- * Feed payload bytes to ucom/tty layer; OR-accumulate header
- * status bits which are transient and could toggle with each
- * packet. After processing all packets in the buffer, process
- * the accumulated transient MSR and LSR values along with the
+ * Feed payload bytes to ucom/tty layer; OR-accumulate the
+ * receiver-related header status bits which are transient and
+ * could toggle with each packet, but for transmitter-related
+ * bits keep only the ones from the last packet.
+ *
+ * After processing all packets in the buffer, process the
+ * accumulated transient MSR and LSR values along with the
* non-transient bits from the last packet header.
*/
while (buflen >= UFTDI_IHDRSIZE) {
usbd_copy_out(pc, offset, buf, UFTDI_IHDRSIZE);
offset += UFTDI_IHDRSIZE;
buflen -= UFTDI_IHDRSIZE;
+ lsr &= ~(ULSR_TXRDY | ULSR_TSRE);
lsr |= FTDI_GET_LSR(buf);
if (FTDI_GET_MSR(buf) & FTDI_SIO_RI_MASK)
msr |= SER_RI;
@@ -1311,8 +1318,7 @@
if (ftdi_msr & FTDI_SIO_RLSD_MASK)
msr |= SER_DCD;
- if ((sc->sc_msr != msr) ||
- ((sc->sc_lsr & FTDI_LSR_MASK) != (lsr & FTDI_LSR_MASK))) {
+ if (sc->sc_msr != msr || sc->sc_lsr != lsr) {
DPRINTF("status change msr=0x%02x (0x%02x) "
"lsr=0x%02x (0x%02x)\n", msr, sc->sc_msr,
lsr, sc->sc_lsr);
Index: head/sys/dev/usb/serial/usb_serial.h
===================================================================
--- head/sys/dev/usb/serial/usb_serial.h
+++ head/sys/dev/usb/serial/usb_serial.h
@@ -180,6 +180,7 @@
#define UCOM_FLAG_WAIT_REFS 0x0100 /* set if we must wait for refs */
#define UCOM_FLAG_FREE_UNIT 0x0200 /* set if we must free the unit */
#define UCOM_FLAG_INWAKEUP 0x0400 /* set if we are in the tsw_inwakeup callback */
+#define UCOM_FLAG_LSRTXIDLE 0x0800 /* set if sc_lsr bits ULSR_TSRE+TXRDY work */
uint8_t sc_lsr;
uint8_t sc_msr;
uint8_t sc_mcr;
@@ -218,4 +219,12 @@
void ucom_drain_all(void *);
void ucom_ref(struct ucom_super_softc *);
int ucom_unref(struct ucom_super_softc *);
+
+static inline void
+ucom_use_lsr_txbits(struct ucom_softc *sc)
+{
+
+ sc->sc_flag |= UCOM_FLAG_LSRTXIDLE;
+}
+
#endif /* _USB_SERIAL_H_ */
Index: head/sys/dev/usb/serial/usb_serial.c
===================================================================
--- head/sys/dev/usb/serial/usb_serial.c
+++ head/sys/dev/usb/serial/usb_serial.c
@@ -161,6 +161,7 @@
static tsw_outwakeup_t ucom_outwakeup;
static tsw_inwakeup_t ucom_inwakeup;
static tsw_free_t ucom_free;
+static tsw_busy_t ucom_busy;
static struct ttydevsw ucom_class = {
.tsw_flags = TF_INITLOCK | TF_CALLOUT,
@@ -172,6 +173,7 @@
.tsw_param = ucom_param,
.tsw_modem = ucom_modem,
.tsw_free = ucom_free,
+ .tsw_busy = ucom_busy,
};
MODULE_DEPEND(ucom, usb, 1, 1, 1);
@@ -1294,6 +1296,27 @@
ucom_start_transfers(sc);
}
+static bool
+ucom_busy(struct tty *tp)
+{
+ struct ucom_softc *sc = tty_softc(tp);
+ const uint8_t txidle = ULSR_TXRDY | ULSR_TSRE;
+
+ UCOM_MTX_ASSERT(sc, MA_OWNED);
+
+ DPRINTFN(3, "sc = %p lsr 0x%02x\n", sc, sc->sc_lsr);
+
+ /*
+ * If the driver maintains the txidle bits in LSR, we can use them to
+ * determine whether the transmitter is busy or idle. Otherwise we have
+ * to assume it is idle to avoid hanging forever on tcdrain(3).
+ */
+ if (sc->sc_flag & UCOM_FLAG_LSRTXIDLE)
+ return ((sc->sc_lsr & txidle) != txidle);
+ else
+ return (false);
+}
+
/*------------------------------------------------------------------------*
* ucom_get_data
*

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