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serial: uartps: Add TACTIVE check in cdns_uart_tx_empty function 

Make sure that all bytes are transmitted out of Uart by monitoring
CDNS_UART_SR_TACTIVE bit as well.

Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Acked-by: Maarten Brock <m.brock@vanmierlo.com>
Link: https://lore.kernel.org/r/e2514818af5973be291cc117d07739f068b71639.1584610774.git.shubhrajyoti.datta@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Raviteja Narayanam 2020-03-19 15:14:51 +05:30 committed by Greg Kroah-Hartman
parent 97451855cc
commit 706bbc572d
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/serial/xilinx_uartps.c
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@ -650,8 +650,8 @@ 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;
}
/**