sc16is7xx: use LSR_TEMT_BIT in .tx_empty()
LSR_TEMT_BIT (LSR bit 6) provides us exactly the information we need to determine if transmission is finished - FIFO level and shift register empty. We can save ourselves reading FIFO level explicitly if we use this bit. Signed-off-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
4117a60c8e
commit
4ae82e5d23
|
@ -683,12 +683,11 @@ static void sc16is7xx_start_tx(struct uart_port *port)
|
|||
|
||||
static unsigned int sc16is7xx_tx_empty(struct uart_port *port)
|
||||
{
|
||||
unsigned int lvl, lsr;
|
||||
unsigned int lsr;
|
||||
|
||||
lvl = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
|
||||
lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
|
||||
|
||||
return ((lsr & SC16IS7XX_LSR_THRE_BIT) && !lvl) ? TIOCSER_TEMT : 0;
|
||||
return (lsr & SC16IS7XX_LSR_TEMT_BIT) ? TIOCSER_TEMT : 0;
|
||||
}
|
||||
|
||||
static unsigned int sc16is7xx_get_mctrl(struct uart_port *port)
|
||||
|
|
Loading…
Reference in New Issue