diff options
| author |   Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-08-08 22:48:42 +0900 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-28 20:51:22 +0200 |
| commit | d3a9184773c5cde483e249096ae7c7f98f310e20 (patch) | |
| tree | 4e93c505f6457f63cfb498f2ce29bfaa54e45152 /firmware | |
| parent | serial: 8250_uniphier: fix serial port index in private data (diff) | |
| download | linux-dev-d3a9184773c5cde483e249096ae7c7f98f310e20.tar.xz linux-dev-d3a9184773c5cde483e249096ae7c7f98f310e20.zip | |
serial: 8250_uniphier: use CHAR register for canary to detect power-off
The 8250 core uses the SCR as a canary to discover if the console has
been powered-off.
This hardware does not have SCR at offset 7, but an unused register
CHAR at a different offset. As long as the character interrupt is
disabled, the register access has no impact, so it is useful as an
alternative scratch register.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'firmware')
0 files changed, 0 insertions, 0 deletions