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

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Message-ID: <20100104231852.GA29950@huya.qualcomm.com>
Date:	Mon, 4 Jan 2010 15:18:52 -0800
From:	David Brown <davidb@...cinc.com>
To:	mark gross <mgross@...ux.intel.com>
Cc:	Daniel Walker <dwalker@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Brown, David" <davidb@...cinc.com>,
	"Chidambaram, Praveen" <pchidamb@...cinc.com>
Subject: Re: [PATCH] pm_qos: Add QoS param, minimum system bus frequency

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

David
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