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tty/serial: atmel: Add is_half_duplex helper 

Use a helper function to check that a port needs to use half duplex
communication, replacing several occurrences of multi-line bit checking.

Fixes: b389f173aa ("tty/serial: atmel: RS485 half duplex w/DMA: enable RX after TX is done")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Razvan Stefanescu <razvan.stefanescu@microchip.com>
Acked-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Razvan Stefanescu 2019-03-19 15:20:34 +02:00 committed by Greg Kroah-Hartman
parent 93bcefd4c6
commit f304098313
1 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/tty/serial/atmel_serial.c
View File

@ -231,6 +231,13 @@ static inline void atmel_uart_write_char(struct uart_port *port, u8 value)
__raw_writeb(value, port->membase + ATMEL_US_THR);
}
static inline int atmel_uart_is_half_duplex(struct uart_port *port)
{
return ((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
(port->iso7816.flags & SER_ISO7816_ENABLED);
}
#ifdef CONFIG_SERIAL_ATMEL_PDC
static bool atmel_use_pdc_rx(struct uart_port *port)
{
@ -608,10 +615,9 @@ static void atmel_stop_tx(struct uart_port *port)
/* Disable interrupts */
atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED)
if (atmel_uart_is_half_duplex(port))
atmel_start_rx(port);
}
/*
@ -628,9 +634,7 @@ static void atmel_start_tx(struct uart_port *port)
return;
if (atmel_use_pdc_tx(port) || atmel_use_dma_tx(port))
if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED)
if (atmel_uart_is_half_duplex(port))
atmel_stop_rx(port);
if (atmel_use_pdc_tx(port))
@ -928,9 +932,7 @@ static void atmel_complete_tx_dma(void *arg)
*/
if (!uart_circ_empty(xmit))
atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx);
else if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED) {
else if (atmel_uart_is_half_duplex(port)) {
/* DMA done, stop TX, start RX for RS485 */
atmel_start_rx(port);
}
@ -1512,9 +1514,7 @@ static void atmel_tx_pdc(struct uart_port *port)
atmel_uart_writel(port, ATMEL_US_IER,
atmel_port->tx_done_mask);
} else {
if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED) {
if (atmel_uart_is_half_duplex(port)) {
/* DMA done, stop TX, start RX for RS485 */
atmel_start_rx(port);
}