Define local variables holding information about whether pdc or dma is
used in the HW. These are retested several times by calls to
atmel_use_pdc_tx() and atmel_use_dma_tx(). So to make the code more
readable, simply cache the values.
This is also a preparatory patch for the next one (where is_pdc is used
once more in atmel_stop_tx()).
Cc: Richard Genoud <richard.genoud@xxxxxxxxx>
Cc: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Cc: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Reported-by: Michael Walle <michael@xxxxxxxx>
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@xxxxxxxxxx>
---
drivers/tty/serial/atmel_serial.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 4ca04676c406..65f63dccfd72 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -552,8 +552,9 @@ static u_int atmel_get_mctrl(struct uart_port *port)
static void atmel_stop_tx(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ bool is_pdc = atmel_use_pdc_tx(port);
- if (atmel_use_pdc_tx(port)) {
+ if (is_pdc) {
/* disable PDC transmit */
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS);
}
@@ -572,7 +573,6 @@ static void atmel_stop_tx(struct uart_port *port)
if (atmel_uart_is_half_duplex(port))
if (!atomic_read(&atmel_port->tasklet_shutdown))
atmel_start_rx(port);
-
}
/*
@@ -581,20 +581,22 @@ static void atmel_stop_tx(struct uart_port *port)
static void atmel_start_tx(struct uart_port *port)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ bool is_pdc = atmel_use_pdc_tx(port);
+ bool is_dma = is_pdc || atmel_use_dma_tx(port);
- if (atmel_use_pdc_tx(port) && (atmel_uart_readl(port, ATMEL_PDC_PTSR)
+ if (is_pdc && (atmel_uart_readl(port, ATMEL_PDC_PTSR)
& ATMEL_PDC_TXTEN))
/* The transmitter is already running. Yes, we
really need this.*/
return;
- if (atmel_use_pdc_tx(port) || atmel_use_dma_tx(port))
- if (atmel_uart_is_half_duplex(port))
- atmel_stop_rx(port);
+ if (is_dma && atmel_uart_is_half_duplex(port))
+ atmel_stop_rx(port);
- if (atmel_use_pdc_tx(port))
+ if (is_pdc) {
/* re-enable PDC transmit */
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
+ }
/* Enable interrupts */
atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask);
--
2.38.1
