[PATCH] omap: wd_timer: Fix crash frm wdt_probe when!CONFIG_RUNTIME_PM

-----Original Message-----
From: Russell King - ARM Linux [mailto:linux at arm.linux.org.uk]
Sent: Thursday, January 06, 2011 3:49 AM
To: Santosh Shilimkar
Cc: linux-omap at vger.kernel.org; Paul Walmsley; linux-arm-
kernel at lists.infradead.org
Subject: Re: [PATCH] omap: wd_timer: Fix crash frm wdt_probe
when!CONFIG_RUNTIME_PM

On Wed, Jan 05, 2011 at 07:10:55PM +0530, Santosh Shilimkar wrote:

quoted

Commit ff2516fb 'wd_timer: disable on boot via hwmod postsetup

mechanism'

quoted

introduced watchdog timer state state management using

postsetup_state.

quoted

This was done to allow some board files to support watchdog

coverage

quoted

throughout kernel initialization and it work as intended when

RUNTIME_PM

quoted

is enabled.

With !CONFIG_RUNTIME_PM and no board is specifically requests

watchdog

quoted

to remain enabled the omap_wdt_probe crashesh. This is because

hwmod

quoted

in absense of runtime PM unable to turn watchdog clocks because

it's

quoted

state is set to be disabled. For rest of the device, the state is
set as enabled in absense of RUNTIME_PM

Err... wasn't this provoked by an attempt to fix the LDP issue, that
is
(I believe) because the boot loader enables the watchdog and pre-
hwmod
kernels used to disable it.  Post-hwmod kernels stopped disabling
the
watchdog, resulting in a few seconds booting userspace before the
system
resets itself.

Yes. That's managed through the shutdown part. Apart from that there
is another enhancement done in case some one wants to have WDT running
throughout the kernel boot.

Regards,
Santosh