Re: [PATCH 0/6] Serial Omap fixes and cleanups

[Sourav Poddar]

Hi Kevin,
On Thursday 18 April 2013 11:53 PM, Kevin Hilman wrote:
> Hi Sourav,
>
> Sourav Poddar<sourav.poddar@xxxxxx>  writes:
>
> > Hi,
> >
> > This patch series contains fixes and cleanups around the issue that
> > the console UART should not idled on suspend while using "no_console_suspend"
> > in bootargs.
> The direction of the series is right, thanks for the updated approach.
> I had a comple minor comments on specific patches, but the ordering of
> the series needs a little tweaking.  It should be
>
> - core/driver changes [current 1-3/6 are ok]
> - remove usage from mach-omap2/serial.c (currently part of 4/6)
> - remove am33x DT usage (current 5/6 is ok)
> - remove entirely from omap_device (omap_device part of 4/6 and 6/6 should be combined)
Thanks a lot for your review and comments.
I have replied to your comments on the respective patches.
Will take care of the "ordering" which you mentioned above
in the next version.

Thanks
Sourav
> Kevin
>
> > 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.
> >
> > While fixing the above issue, there are other cleanups also done as part of
> > this series which are no longer required. This cleanups mainly include getting
> > rid of using "omap_device_disable_idle_on_suspend" api for both dt and non dt case
> > as the serial driver will be self sufficient to handle the "no_idle_on_suspend" issue.
> > Serial was the only one making use of "omap_device_disable_idle_on_suspend"
> >
> > Test info (except drivers: serial: mpc52xx_uart: Remove "uart_console" defintion):
> > Omap4430sdp:
> > - Tested wakeup from UART after suspend for dt and non dt case.
> > Omap5430evm:
> > - Tested wakeup from UART after suspend for dt case.
> >
> >
> > There were discussions about how to handle "no_idle_on_suspend" issue and all the
> > discussions are as follows:
> > [v3]: https://lkml.org/lkml/2013/4/5/239
> > [v2]: https://lkml.org/lkml/2013/4/2/350
> > [v1]: https://lkml.org/lkml/2013/3/18/199
> >        https://lkml.org/lkml/2013/3/18/295
> > Due to the amount of change in approach and other cleanups coming around it, I am posting
> > this as a new series.
> >
> > This patches are based on 3.9-rc3 custom tree which has
> > Santosh Shilimkar serial patch[1]
> > [1]: http://permalink.gmane.org/gmane.linux.ports.arm.omap/95828
> >
> > Cc: Santosh Shilimkar<santosh.shilimkar@xxxxxx>
> > Cc: Felipe Balbi<balbi@xxxxxx>
> > Cc: Rajendra nayak<rnayak@xxxxxx>
> >
> > Sourav Poddar (6):
> >    drivers: tty: serial: Move "uart_console" def to core header file.
> >    drivers: serial: mpc52xx_uart: Remove "uart_console" defintion
> >    driver: serial: omap: add prepare/complete callback for
> >      "no_console_suspend" case
> >    arm: mach-omap2: remove "OMAP_DEVICE_NO_IDLE_ON_SUSPEND" check
> >    arm: dts: am33xx: Remove "ti,no_idle_on_suspend" property.
> >    arm: mach-omap2: Remove "no_console_suspend"
> >
> >   arch/arm/boot/dts/am33xx.dtsi     |    1 -
> >   arch/arm/mach-omap2/omap_device.c |   10 +---------
> >   arch/arm/mach-omap2/serial.c      |    7 -------
> >   drivers/tty/serial/mpc52xx_uart.c |   10 ----------
> >   drivers/tty/serial/omap-serial.c  |   20 ++++++++++++++++++++
> >   drivers/tty/serial/serial_core.c  |    6 ------
> >   include/linux/serial_core.h       |    6 ++++++
> >   7 files changed, 27 insertions(+), 33 deletions(-)

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