diff options
Diffstat (limited to 'recipes-kernel/linux/linux-xlnx/3.17/tty-xuartps-Fix-RX-hang-and-TX-corruption-in-set_termios.patch')
| -rw-r--r-- | recipes-kernel/linux/linux-xlnx/3.17/tty-xuartps-Fix-RX-hang-and-TX-corruption-in-set_termios.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-xlnx/3.17/tty-xuartps-Fix-RX-hang-and-TX-corruption-in-set_termios.patch b/recipes-kernel/linux/linux-xlnx/3.17/tty-xuartps-Fix-RX-hang-and-TX-corruption-in-set_termios.patch new file mode 100644 index 00000000..4ac6624d --- /dev/null +++ b/recipes-kernel/linux/linux-xlnx/3.17/tty-xuartps-Fix-RX-hang-and-TX-corruption-in-set_termios.patch @@ -0,0 +1,34 @@ +From c3181f01d21953bff9971e141a193c445099e90f Mon Sep 17 00:00:00 2001 +From: Nathan Rossi <nathan.rossi@xilinx.com> +Date: Mon, 24 Nov 2014 15:11:43 +1000 +Subject: [PATCH] tty: xuartps: Fix RX hang, and TX corruption in set_termios + +Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com> +--- + drivers/tty/serial/xilinx_uartps.c | 10 ++++++---- + 1 file changed, 6 insertions(+), 4 deletions(-) + +diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c +index 7f8027f..74dd5c9 100644 +--- a/drivers/tty/serial/xilinx_uartps.c ++++ b/drivers/tty/serial/xilinx_uartps.c +@@ -628,10 +628,12 @@ static void cdns_uart_set_termios(struct uart_port *port, + + spin_lock_irqsave(&port->lock, flags); + +- /* Empty the receive FIFO 1st before making changes */ +- while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) & +- CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) { +- cdns_uart_readl(CDNS_UART_FIFO_OFFSET); ++ /* Wait for the transmit FIFO to empty before making changes */ ++ if (!(cdns_uart_readl(CDNS_UART_CR_OFFSET) & CDNS_UART_CR_TX_DIS)) { ++ while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & ++ CDNS_UART_SR_TXEMPTY)) { ++ cpu_relax(); ++ } + } + + /* Disable the TX and RX to set baud rate */ +-- +2.1.1 + |