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

Santosh Shilimkar santosh.shilimkar at ti.com
Wed Jan 5 22:57:32 EST 2011

> -----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
> On Wed, Jan 05, 2011 at 07:10:55PM +0530, Santosh Shilimkar wrote:
> > Commit ff2516fb 'wd_timer: disable on boot via hwmod postsetup
> mechanism'
> > introduced watchdog timer state state management using
> postsetup_state.
> > This was done to allow some board files to support watchdog
> coverage
> > throughout kernel initialization and it work as intended when
> > is enabled.
> >
> > With !CONFIG_RUNTIME_PM and no board is specifically requests
> watchdog
> > to remain enabled the omap_wdt_probe crashesh. This is because
> hwmod
> > in absense of runtime PM unable to turn watchdog clocks because
> it's
> > 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.


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