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authorMark <dmarkh@cfl.rr.com>2018-08-12 11:47:16 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-12 18:53:30 +0200
commit47ac76662ca9c5852fd353093f19de3ae85f2e66 (patch)
tree867d6f72df2c014417ef121d1e7c2e171b7f01b7
parent60ab0fafc4b652fcaf7cbc3bb8555a0cf1149c28 (diff)
downloadlinux-47ac76662ca9c5852fd353093f19de3ae85f2e66.tar.bz2
tty: serial: 8250: Revert NXP SC16C2552 workaround
Revert commit ecb988a3b7985913d1f0112f66667cdd15e40711: tty: serial: 8250: 8250_core: NXP SC16C2552 workaround The above commit causes userland application to no longer write correctly its first write to a dumb terminal connected to /dev/ttyS0. This commit seems to be the culprit. It's as though the TX FIFO is being reset during that write. What should be displayed is: PSW 80000000 INST 00000000 HALT // What is displayed is some variation of: T 00000000 HAL// Reverting this commit via this patch fixes my problem. Signed-off-by: Mark Hounschell <dmarkh@cfl.rr.com> Fixes: ecb988a3b798 ("tty: serial: 8250: 8250_core: NXP SC16C2552 workaround") Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/8250/8250_port.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 8d863004c0da..3f779d25ec0c 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -90,8 +90,7 @@ static const struct serial8250_config uart_config[] = {
.name = "16550A",
.fifo_size = 16,
.tx_loadsz = 16,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
- UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+ .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
.rxtrig_bytes = {1, 4, 8, 14},
.flags = UART_CAP_FIFO,
},