Relocate cdns_uart_tx_empty function to avoid prototype statement in
rs485 changes.
Update return check with uart_tx_stopped() in cdns_uart_handle_tx().
Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@xxxxxxx>
---
Changes since V4:
This patch introduced in V4.
Changes for V5:
None.
Changes for V6:
None.
Changes for V7:
None.
Changes for V8:
None.
Changes for V9:
Update return check with uart_tx_stopped() in cdns_uart_handle_tx().
Update description of cdns_uart_handle_tx() and add clear TX Empty interrupt
comment cdns_uart_start_tx().
Changes for V10:
Add disable the TX Empty interrupt comment in cdns_uart_handle_tx().
---
drivers/tty/serial/xilinx_uartps.c | 36 ++++++++++++++++--------------
1 file changed, 19 insertions(+), 17 deletions(-)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 920762d7b4a4..765a6e174052 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -306,7 +306,22 @@ static void cdns_uart_handle_rx(void *dev_id, unsigned int isrstatus)
}
/**
- * cdns_uart_handle_tx - Handle the bytes to be Txed.
+ * cdns_uart_tx_empty - Check whether TX is empty
+ * @port: Handle to the uart port structure
+ *
+ * Return: TIOCSER_TEMT on success, 0 otherwise
+ */
+static unsigned int cdns_uart_tx_empty(struct uart_port *port)
+{
+ unsigned int status;
+
+ status = readl(port->membase + CDNS_UART_SR);
+ status &= (CDNS_UART_SR_TXEMPTY | CDNS_UART_SR_TACTIVE);
+ return (status == CDNS_UART_SR_TXEMPTY) ? TIOCSER_TEMT : 0;
+}
+
+/**
+ * cdns_uart_handle_tx - Handle the bytes to be transmitted.
* @dev_id: Id of the UART port
* Return: None
*/
@@ -316,7 +331,8 @@ static void cdns_uart_handle_tx(void *dev_id)
struct circ_buf *xmit = &port->state->xmit;
unsigned int numbytes;
- if (uart_circ_empty(xmit)) {
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ /* Disable the TX Empty interrupt */
writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IDR);
return;
}
@@ -587,6 +603,7 @@ static void cdns_uart_start_tx(struct uart_port *port)
if (uart_circ_empty(&port->state->xmit))
return;
+ /* Clear the TX Empty interrupt */
writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_ISR);
cdns_uart_handle_tx(port);
@@ -626,21 +643,6 @@ static void cdns_uart_stop_rx(struct uart_port *port)
writel(regval, port->membase + CDNS_UART_CR);
}
-/**
- * cdns_uart_tx_empty - Check whether TX is empty
- * @port: Handle to the uart port structure
- *
- * Return: TIOCSER_TEMT on success, 0 otherwise
- */
-static unsigned int cdns_uart_tx_empty(struct uart_port *port)
-{
- unsigned int status;
-
- status = readl(port->membase + CDNS_UART_SR) &
- (CDNS_UART_SR_TXEMPTY | CDNS_UART_SR_TACTIVE);
- return (status == CDNS_UART_SR_TXEMPTY) ? TIOCSER_TEMT : 0;
-}
-
/**
* cdns_uart_break_ctl - Based on the input ctl we have to start or stop
* transmitting char breaks
--
2.25.1
