linux-kernel - Re: [PATCH] pm_qos: Add QoS param, minimum system bus frequency

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Message-ID: <20100106184926.GB21316@linux.intel.com>
Date:	Wed, 6 Jan 2010 10:49:26 -0800
From:	mark gross <mgross@...ux.intel.com>
To:	David Brown <davidb@...cinc.com>
Cc:	Daniel Walker <dwalker@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chidambaram, Praveen" <pchidamb@...cinc.com>
Subject: Re: [PATCH] pm_qos: Add QoS param, minimum system bus frequency

On Mon, Jan 04, 2010 at 03:18:52PM -0800, David Brown wrote:
> On Mon, Jan 04, 2010 at 01:38:52PM -0800, mark gross wrote:
> 
> > Also, on your platform you have a throttling driver controlling the
> > frequency of some bus, that will use this value as a constraint on how
> > far it will throttle.  no?  I would be interested in seeing this driver
> > sometime.  (I just want to make sure no one bastardizes pm_qos into an
> > operating point thing.  I'm not sure I can justify why but I want to
> > avoid that.)
> 
> We're part of a system with several other devices.  Our driver
> just passes the frequency on as our voted minimum.
> 
> Look for PM_QOS_SYSTEM_BUS_FREQ in the file:
> 
>   https://www.codeaurora.org/gitweb/quic/la/?p=kernel/msm.git;a=blob;f=arch/arm/mach-msm/clock.c;h=3a22b5abb8e8acf876367dc6c013fe507af9c0ac;hb=287d333b03df8faafd3a480abc8e121110870839
> 
>   http://tinyurl.com/ye7eg33
hurray for tinyurls!

It looks pretty ok to me on my initial inspection.

--mgross
 
> David
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