[PATCH v4 2/2] serial: uartps: Add TACTIVE check in cdns_uart_tx_empty function
From: Shubhrajyoti Datta <hidden>
Date: 2020-03-19 09:53:17
Also in:
linux-serial
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: Raviteja Narayanam <redacted> Make sure that all bytes are transmitted out of Uart by monitoring CDNS_UART_SR_TACTIVE bit as well. Signed-off-by: Raviteja Narayanam <redacted> Signed-off-by: Shubhrajyoti Datta <redacted> --- drivers/tty/serial/xilinx_uartps.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 662b8ab..38cb76a9 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c@@ -663,8 +663,8 @@ 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; - return status ? TIOCSER_TEMT : 0; + (CDNS_UART_SR_TXEMPTY | CDNS_UART_SR_TACTIVE); + return (status == CDNS_UART_SR_TXEMPTY) ? TIOCSER_TEMT : 0; } /**
--
2.1.1
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