[PATCHv5 0/3] Serial fixes

From: Sourav Poddar
Date: Fri Apr 26 2013 - 16:05:17 EST


This patch series contains fixes around the issue that
the console UART should not idled on suspend while using
"no_console_suspend" in bootargs.

The approach thought of is to modify the serial core/serial driver to bypass
runtime PM if the UART in contention is a console and we are using "no_console_suspend"
in our bootargs.

There were discussions about how to handle "no_idle_on_suspend" issue and all the
discussions are as follows:
Due to the amount of change in approach, I am posting
this as a new series.

1. Add comments
2. Formatting.

1. check for console in runtime api.

1. Use "-EBUSY" for no_console_suspend case
2. Bypass runtime PM only during suspend
3. Improve the commit log based on community suggestion.

1. Remove the prepare/complete callback.
2. Adapt runtime PM callback to deal with the issue.
3. Fold patch(1,2) of previous series into 1.
4. Reordered the patch.
5. Change $subject and chage log for few patches.

Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Cc: Felipe Balbi <balbi@xxxxxx>
Cc: Rajendra nayak <rnayak@xxxxxx>

Test info
- Tested wakeup from UART after suspend for dt and non dt case.
- Tested wakeup from UART after suspend for dt case.

These patches were the part of the bigger series[1]. Breaking them into
two relevant series as they go through the different tree.

[1]: http://lkml.org/lkml/2013/4/26/274

This patches are based on 3.9-rc8

The following changes since commit 824282ca7d250bd7c301f221c3cd902ce906d731:

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus (2013-04-22 15:00:59 -0700)

are available in the git repository at:

git://gitorious.org/linux-connectivity/linux-connectivity.git serial_fix

Sourav Poddar (2):
driver: tty: serial: Move "uart_console" def to core header file.
driver: serial: omap: prevent runtime PM for "no_console_suspend"

drivers/tty/serial/mpc52xx_uart.c | 10 ----------
drivers/tty/serial/omap-serial.c | 34 +++++++++++++++++++++++++++++++++-
drivers/tty/serial/serial_core.c | 6 ------
include/linux/serial_core.h | 7 +++++++
4 files changed, 40 insertions(+), 17 deletions(-)

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