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authorMingrui Ren <jiladahe1997@gmail.com>2020-12-02 10:25:43 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-12-04 18:54:20 +0300
commitaef1b6a27970607721a618a0b990716ca8dbbf97 (patch)
treeac97b7ba08dc9039459c8d0f9133956aa4c095a2 /drivers/tty
parent7af77ba42467da8a4dbfe0dfd0a467227e8fbe5f (diff)
downloadlinux-aef1b6a27970607721a618a0b990716ca8dbbf97.tar.xz
tty/serial/imx: Enable TXEN bit in imx_poll_init().
As described in Documentation, poll_init() is called by kgdb to initialize hardware which supports both poll_put_char() and poll_get_char(). It's necessary to enable TXEN bit, otherwise, it will cause hardware fault and kernel panic when calling imx_poll_put_char(). Generally, if use /dev/ttymxc0 as kgdb console as well as system console, ttymxc0 is initialized early by system console which does enable TXEN bit.But when use /dev/ttymxc1 as kgbd console, ttymxc1 is only initialized by imx_poll_init() cannot enable the TXEN bit, which will cause kernel panic. Signed-off-by: Mingrui Ren <jiladahe1997@gmail.com> Link: https://lore.kernel.org/r/20201202072543.151-1-972931182@qq.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/imx.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index b50f97cb07e9..cafa88df5a85 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1861,7 +1861,7 @@ static int imx_uart_poll_init(struct uart_port *port)
ucr1 |= UCR1_UARTEN;
ucr1 &= ~(UCR1_TRDYEN | UCR1_RTSDEN | UCR1_RRDYEN);
- ucr2 |= UCR2_RXEN;
+ ucr2 |= UCR2_RXEN | UCR2_TXEN;
ucr2 &= ~UCR2_ATEN;
imx_uart_writel(sport, ucr1, UCR1);