From mboxrd@z Thu Jan  1 00:00:00 1970
From: marek.vasut.n900@gmail.com (Marek Vasut)
Date: Sun, 27 Mar 2011 16:50:45 +0200
Subject: [PATCH RFC] ARM: PXA27x: CPUFREQ: Don't use fastbus mode
In-Reply-To: <201103271745.15216.anarsoul@gmail.com>
References: <1301169103-23968-1-git-send-email-anarsoul@gmail.com>
	<201103271248.02774.anarsoul@gmail.com>
	<4D8F0CD0.8010203@compulab.co.il>
	<201103271745.15216.anarsoul@gmail.com>
Message-ID: <1301237445.10630.2.camel@konomi>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

> On Sunday 27 March 2011 13:09:20 Igor Grinberg wrote:
> > On 03/27/11 11:48, Vasily Khoruzhick wrote:
> > > On Sunday 27 March 2011 12:09:21 Igor Grinberg wrote:
> > > > Possibly, but Z2 is not the only one using PXA27x.
> > > > And of course you lose performance, unless you don't care,
> > > > because if it does not work at all, you don't care about
> > > > performance, but again it is wrong to force all PXA27x based
> > > > boards to this.
> > > 
> > > Ok, that's why I've sent this patch with RFC in subject - Z2 is the
> > > only PXA270-based device I own :)
> > > 
> > > > cm-x270 and em-x270 work well with fast bus bit set with userspace
> > > > governor and with the above frequencies.
> > > 
> > > What about ondemand and conservative governors?
> > 
> > I haven't tested those and I don't think I will have an opportunity in
> > the near future, but is it really important also to test those? Are
> > they different in any special way?
> 
> They switch freq rapidly, so they can be used as stability test for
> cpufreq?  implementation.

Aren't you seeing a locking issue during the switch instead of fastbus problem then?

> 
> Regards
> Vasily