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Commit 7d07ada0 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Greg Kroah-Hartman
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serial: mpc52xx: let tx_empty callback return either 0 or TIOCSER_TEMT 



Documenation/serial/driver requests that the tx_empty callback should
return 0 if there are still chars in the fifo or shifter or TIOCSER_TEMT
(0x01) if no character is pending to be sent.

Fix the mpc52xx serial driver to not return MPC52xx_PSC_SR_TXEMP (i.e.
0x0800) but TIOCSER_TEMT as documented.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7b9c5162

drivers/tty/serial/mpc52xx_uart.c

+3 −2
Original line number Diff line number Diff line
@@ -239,8 +239,9 @@ static int mpc52xx_psc_tx_rdy(struct uart_port *port) 


static int mpc52xx_psc_tx_empty(struct uart_port *port)

{

	return in_be16(&PSC(port)->mpc52xx_psc_status)

	    & MPC52xx_PSC_SR_TXEMP;

	u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);



	return (sts & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;

}



static void mpc52xx_psc_start_tx(struct uart_port *port)