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

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Date:	Thu, 18 Apr 2013 11:23:23 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Sourav Poddar <sourav.poddar@...com>
Cc:	<gregkh@...uxfoundation.org>, <tony@...mide.com>,
	<rmk+kernel@....linux.org.uk>, <linux-serial@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Felipe Balbi <balbi@...com>, Rajendra nayak <rnayak@...com>
Subject: Re: [PATCH 0/6] Serial Omap fixes and cleanups

Hi Sourav,

Sourav Poddar <sourav.poddar@...com> 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)

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@...com>
> Cc: Felipe Balbi <balbi@...com>
> Cc: Rajendra nayak <rnayak@...com>
>
> 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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