Re: [PATCH 0/6] Serial Omap fixes and cleanups
From: Kevin Hilman
Date: Thu Apr 18 2013 - 14:23:36 EST
Sourav Poddar <sourav.poddar@xxxxxx> writes:
> 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)
> 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):
> - Tested wakeup from UART after suspend for dt and non dt case.
> - 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
> 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
> : 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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