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| author |  Mingrui Ren <jiladahe1997@gmail.com>
| 2020-12-02 15:25:43 +0800 |
|---|---|---|
| committer |  Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| 2020-12-04 16:54:20 +0100 |
| commit | aef1b6a27970607721a618a0b990716ca8dbbf97 (patch) | |
| tree | ac97b7ba08dc9039459c8d0f9133956aa4c095a2 /drivers/tty/tty_ioctl.c | |
| parent | tty : serial: jsm: Fixed file by adding spacing (diff) | |
| download | linux-aef1b6a27970607721a618a0b990716ca8dbbf97.tar.gz linux-aef1b6a27970607721a618a0b990716ca8dbbf97.tar.bz2 linux-aef1b6a27970607721a618a0b990716ca8dbbf97.zip | |
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/tty_ioctl.c')
0 files changed, 0 insertions, 0 deletions