[rtems commit] leon, apbuart: Wait for shift register on close

[Daniel Hellstrom]

Module:    rtems
Branch:    master
Commit:    e5e44bdb10d515fb287bf2d19412c21876361e46
Changeset: http://git.rtems.org/rtems/commit/?id=e5e44bdb10d515fb287bf2d19412c21876361e46

Author:    Martin Aberg <maberg at gaisler.com>
Date:      Tue Mar 14 17:46:12 2017 +0100

leon, apbuart: Wait for shift register on close

Do not disable transmitter until shift register is empty when closing device.
It is correct to look at the sending software state when closing the device.
However, the sending state must be cleared only when everything is sent.

---

 c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c b/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c
index a52c360..c79d408 100644
--- a/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c
+++ b/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c
@@ -497,6 +497,12 @@ static void last_close(
 		while (uart->sending) {
 			/* Wait until all data has been sent */
 		}
+		while (
+			(uart->regs->ctrl & APBUART_CTRL_TE) &&
+			!(uart->regs->status & APBUART_STATUS_TS)
+		) {
+			/* Wait until all data has left shift register */
+		}
 
 		/* Disable and unregister interrupt handler */
 		drvmgr_interrupt_unregister(uart->dev, 0, apbuart_cons_isr, tty);
@@ -846,7 +852,6 @@ static void apbuart_cons_isr(void *arg)
 	if (uart->sending && (status & APBUART_STATUS_TE)) {
 		/* Tell close that we sent everything */
 		cnt = uart->sending;
-		uart->sending = 0;
 
 		/*
 		 * Tell termios how much we have sent. dequeue() may call