Ian Lepore 6a5cb81714 MFC r313287: ...

Add tsw_busy support to usb_serial (ucom).

  The tty layer uses tsw_busy to poll for busy/idle status of the transmitter
  hardware during close() and tcdrain(). The ucom layer defines ULSR_TXRDY and
  ULSR_TSRE bits for the line status register; when both are set, the
  transmitter is idle. Not all chip drivers maintain those bits in the sc_lsr
  field, and if the bits never get set the transmitter will always appear
  busy, causing hangs in tcdrain().

  These changes add a new sc_flag bit, UCOM_FLAG_LSRTXIDLE. When this flag is
  set, ucom_busy() uses the lsr bits to return busy vs. idle state, otherwise
  it always returns idle (which is effectively what happened before this
  change because tsw_busy wasn't implemented).

  For the uftdi chip driver, these changes stop masking out the tx idle bits
  when processing the status register (because now they're useful), and it
  calls ucom_use_lsr_txbits() to indicate the bits are maintained by the
  driver and can be used by ucom_busy().

2017-03-02 04:42:33 +00:00

..

u3g.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

uark.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

ubsa.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

ubser.c

…

uchcom.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

ucycom.c

…

ufoma.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

uftdi_reg.h

…

uftdi.c

MFC r313287:

2017-03-02 04:42:33 +00:00

ugensa.c

…

uipaq.c

…

ulpt.c

…

umcs.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

umcs.h

…

umct.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

umodem.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

umoscom.c

…

uplcom.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

usb_serial.c

MFC r313287:

2017-03-02 04:42:33 +00:00

usb_serial.h

MFC r313287:

2017-03-02 04:42:33 +00:00

uslcom.c

MFC r303347, r303350, r303351, r303353:

2017-03-01 18:23:30 +00:00

uvisor.c

…

uvscom.c

…