1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 2209620d2349..b1ae774016f1 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -64,6 +64,8 @@ static int serial_index(struct uart_port *port)
         return (serial8250_reg.minor - 64) + port->line;
 }
 
+static unsigned int skip_txen_test; /* force skip of txen test at init time */
+
 /*
  * Debugging.
  */
@@ -2108,7 +2110,7 @@ static int serial8250_startup(struct uart_port *port)
            is variable. So, let's just don't test if we receive
            TX irq. This way, we'll never enable UART_BUG_TXEN.
          */
-        if (up->port.flags & UPF_NO_TXEN_TEST)
+        if (skip_txen_test || up->port.flags & UPF_NO_TXEN_TEST)
                 goto dont_test_tx_en;
 
         /*
@@ -3248,6 +3250,9 @@ MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices"
 module_param(nr_uarts, uint, 0644);
 MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
 
+module_param(skip_txen_test, uint, 0644);
+MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
+
 #ifdef CONFIG_SERIAL_8250_RSA
 module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444);
 MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");