[PATCH 2/3] serial: mxs-auart: check BUSY flag on tx_empty hook
From: Hector Palacios <hidden>
Date: 2013-11-29 16:35:26
Also in:
linux-serial
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
Make sure AUART is not busy before returning tx empty. Signed-off-by: Hector Palacios <redacted> --- drivers/tty/serial/mxs-auart.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index d9bf6e103f65..e5540c89dd48 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c@@ -776,10 +776,13 @@ static void mxs_auart_shutdown(struct uart_port *u) static unsigned int mxs_auart_tx_empty(struct uart_port *u) { - if (readl(u->membase + AUART_STAT) & AUART_STAT_TXFE) + unsigned long stat; + + stat = readl(u->membase + AUART_STAT); + if ((stat & (AUART_STAT_BUSY | AUART_STAT_TXFE)) == AUART_STAT_TXFE) return TIOCSER_TEMT; - else - return 0; + + return 0; } /*