From: Imre Deak <imre.deak@nokia.com>
To: "ext Premi, Sanjeev" <premi@ti.com>
Cc: "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: OMAP3: PM : Timer to turn LCD off
Date: Fri, 20 Feb 2009 15:38:48 +0200 [thread overview]
Message-ID: <20090220133848.GI14315@localhost> (raw)
In-Reply-To: <B85A65D85D7EB246BE421B3FB0FBB59301C74A6B3D@dbde02.ent.ti.com>
On Fri, Feb 20, 2009 at 02:24:50PM +0100, ext Premi, Sanjeev wrote:
> While testing cpuidle (from Kevin's PM beanch) with default configuration for OMAP3EVM, the c-state never transitions from C0.
>
> Even compiling with minimal drivers did not help. "fck_core1" continues to be active.
> Also, the LCD continues to be powered on... Despite compiling out V4L and FB drivers.
>
> A simple way to turn LCD off would be to implement an inactivity timer. (e.g. serial.c on the pm branch)
Blanking seems to me more of a user space policy. You could turn off the
LCD backlight from the board file if the FB driver is not configured.
--Imre
>
> The question is - where should this timer be implemented?
> - As part of the backlight driver?
> OR
> - As part of the fb driver?
> OR
> - Should it be tied to the board initialization?
>
> Best regards,
> Sanjeev
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prev parent reply other threads:[~2009-02-20 13:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-20 13:24 OMAP3: PM : Timer to turn LCD off Premi, Sanjeev
2009-02-20 13:38 ` Imre Deak [this message]
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