The patch titled
serial: add parameter to force skipping the test for the TXEN bug
has been added to the -mm tree. Its filename is
serial-add-parameter-to-force-skipping-the-test-for-the-txen-bug.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: serial: add parameter to force skipping the test for the TXEN bug
From: Chuck Ebbert <cebbert@xxxxxxxxxx>
Allow users to force skipping the TXEN test at init time. Applies
to all serial ports. Intended for debugging only.
Signed-off-by: Chuck Ebbert <cebbert@xxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/serial/8250.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN drivers/serial/8250.c~serial-add-parameter-to-force-skipping-the-test-for-the-txen-bug drivers/serial/8250.c
--- a/drivers/serial/8250.c~serial-add-parameter-to-force-skipping-the-test-for-the-txen-bug
+++ a/drivers/serial/8250.c
@@ -64,6 +64,8 @@ static int serial_index(struct uart_port
return (serial8250_reg.minor - 64) + port->line;
}
+static unsigned int skip_txen_test; /* force skip of txen test at init time */
+
/*
* Debugging.
*/
@@ -2092,7 +2094,7 @@ static int serial8250_startup(struct uar
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;
/*
@@ -3218,6 +3220,9 @@ MODULE_PARM_DESC(share_irqs, "Share IRQs
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");
_
Patches currently in -mm which might be from cebbert@xxxxxxxxxx are
linux-next.patch
serial-add-parameter-to-force-skipping-the-test-for-the-txen-bug.patch
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