diff options
| author | Harald Seiler <hws@denx.de> | 2022-01-19 15:52:03 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-11 12:06:04 +0100 |
| commit | 582e9a24fc139adabb1dc951620870806bfc1583 (patch) | |
| tree | 6f955aba131a68c4b19cb72de68de0d590ccfed6 /drivers | |
| parent | fcc446c8aa6303b247b0d88f460167b731265282 (diff) | |
| download | linux-582e9a24fc139adabb1dc951620870806bfc1583.tar.bz2 | |
tty: serial: imx: Add fast path when rs485 delays are 0
Right now, even when `delay_rts_before_send` and `delay_rts_after_send`
are 0, the hrtimer is triggered (with timeout 0) which can introduce a
few 100us of additional overhead on slower i.MX platforms.
Implement a fast path when the delays are 0, where the RTS signal is
toggled immediately instead of going through an hrtimer. This fast path
behaves identical to the code before delay support was implemented.
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Harald Seiler <hws@denx.de>
Link: https://lore.kernel.org/r/20220119145204.238767-1-hws@denx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/imx.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index d8034f166686..0b467ce8d737 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -455,9 +455,14 @@ static void imx_uart_stop_tx(struct uart_port *port) if (port->rs485.flags & SER_RS485_ENABLED) { if (sport->tx_state == SEND) { sport->tx_state = WAIT_AFTER_SEND; - start_hrtimer_ms(&sport->trigger_stop_tx, + + if (port->rs485.delay_rts_after_send > 0) { + start_hrtimer_ms(&sport->trigger_stop_tx, port->rs485.delay_rts_after_send); - return; + return; + } + + /* continue without any delay */ } if (sport->tx_state == WAIT_AFTER_RTS || @@ -698,9 +703,14 @@ static void imx_uart_start_tx(struct uart_port *port) imx_uart_stop_rx(port); sport->tx_state = WAIT_AFTER_RTS; - start_hrtimer_ms(&sport->trigger_start_tx, + + if (port->rs485.delay_rts_before_send > 0) { + start_hrtimer_ms(&sport->trigger_start_tx, port->rs485.delay_rts_before_send); - return; + return; + } + + /* continue without any delay */ } if (sport->tx_state == WAIT_AFTER_SEND |