cpufreq support for the Beagleboard.

cpufreq support for the Beagleboard.

[javier Martin]

Hi,
I am testing latest 2.6.38 stable kernel with my Beagleboard xM. I
have enabled CONFIG_CPU_FREQ option and several governors.
However, when I boot the board and execute "cpufreq-info" I get the following:

root@beagleboard:~# cpufreq-info
cpufrequtils 006: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
  no or unknown cpufreq driver is active on this CPU
  maximum transition latency: 0.00 ms.

I've read some information in this wiki: http://elinux.org/OMAP_Power_Management

It seems that cpufreq is still not in mainline but it should be
already on pm branch of omap repository. However, I've also tried
compiling this one and I've got the same problem.

Could anyone clarify whether cpufreq is supported or not in the
Beagleboard xM and where?

Thank you.

-- 
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com

RE: cpufreq support for the Beagleboard.

[Vishwanath Sripathy]

Cpufreq for omap is not mainlined yet.
Patches for supporting omap cpufreq are posted at
https://patchwork.kernel.org/patch/495021/

Same are available at
git://gitorious.org/omap-pm/linux.git omap_dvfs

Vishwa

> -----Original Message-----
> From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
> owner@vger.kernel.org] On Behalf Of javier Martin
> Sent: Monday, March 21, 2011 4:12 PM
> To: linux-omap@vger.kernel.org
> Subject: cpufreq support for the Beagleboard.
>
> Hi,
> I am testing latest 2.6.38 stable kernel with my Beagleboard xM. I
> have enabled CONFIG_CPU_FREQ option and several governors.
> However, when I boot the board and execute "cpufreq-info" I get the
> following:
>
> root@beagleboard:~# cpufreq-info
> cpufrequtils 006: cpufreq-info (C) Dominik Brodowski 2004-2009
> Report errors and bugs to cpufreq@vger.kernel.org, please.
> analyzing CPU 0:
>   no or unknown cpufreq driver is active on this CPU
>   maximum transition latency: 0.00 ms.
>
> I've read some information in this wiki:
> http://elinux.org/OMAP_Power_Management
>
> It seems that cpufreq is still not in mainline but it should be
> already on pm branch of omap repository. However, I've also tried
> compiling this one and I've got the same problem.
>
> Could anyone clarify whether cpufreq is supported or not in the
> Beagleboard xM and where?
>
> Thank you.
>
> --
> Javier Martin
> Vista Silicon S.L.
> CDTUC - FASE C - Oficina S-345
> Avda de los Castros s/n
> 39005- Santander. Cantabria. Spain
> +34 942 25 32 60
> www.vista-silicon.com
> --
> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: cpufreq support for the Beagleboard.

[javier Martin]

Hi,
thank you for your fast answer.

I've been testing the repository you pointed me and I found that only
300MHz and 600MHz can be selected in the Beagleboard xM.
Couldn't we work until 1000MHz?

Do you know what's left for those patches to enter mainline? Is
anybody working on it?

Thanks.

-- 
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com

RE: cpufreq support for the Beagleboard.

[Vishwanath Sripathy]

> -----Original Message-----
> From: javier Martin [mailto:javier.martin@vista-silicon.com]
> Sent: Monday, March 21, 2011 5:40 PM
> To: Vishwanath Sripathy
> Cc: linux-omap@vger.kernel.org
> Subject: Re: cpufreq support for the Beagleboard.
>
> Hi,
> thank you for your fast answer.
>
> I've been testing the repository you pointed me and I found that only
> 300MHz and 600MHz can be selected in the Beagleboard xM.
> Couldn't we work until 1000MHz?
1G is disabled by default in OPP table I suppose. Pls enable it (in
omap36xx_opp_def_list) if your board supports it.
>
> Do you know what's left for those patches to enter mainline? Is
> anybody working on it?
OMAP cpufreq is undergoing some architecture/design changes and this is
WIP.

Vishwa
>
> Thanks.
>
> --
> Javier Martin
> Vista Silicon S.L.
> CDTUC - FASE C - Oficina S-345
> Avda de los Castros s/n
> 39005- Santander. Cantabria. Spain
> +34 942 25 32 60
> www.vista-silicon.com

Re: cpufreq support for the Beagleboard.

[javier Martin]

>> Do you know what's left for those patches to enter mainline? Is
>> anybody working on it?
> OMAP cpufreq is undergoing some architecture/design changes and this is
> WIP.

Are you the one who is developing this? Do you need help?

Thanks.

-- 
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com

Re: cpufreq support for the Beagleboard.

[Menon, Nishanth]

On Mon, Mar 21, 2011 at 18:54, Vishwanath Sripathy <vishwanath.bs@ti.com> wrote:
>
> > -----Original Message-----
> > From: javier Martin [mailto:javier.martin@vista-silicon.com]
> > Sent: Monday, March 21, 2011 5:40 PM
> > To: Vishwanath Sripathy
> > Cc: linux-omap@vger.kernel.org
> > Subject: Re: cpufreq support for the Beagleboard.
> >
> > Hi,
> > thank you for your fast answer.
> >
> > I've been testing the repository you pointed me and I found that only
> > 300MHz and 600MHz can be selected in the Beagleboard xM.
> > Couldn't we work until 1000MHz?
> 1G is disabled by default in OPP table I suppose. Pls enable it (in
> omap36xx_opp_def_list) if your board supports it.
> >
> > Do you know what's left for those patches to enter mainline? Is
> > anybody working on it?
> OMAP cpufreq is undergoing some architecture/design changes and this is
> WIP.


Also see pending work for enabling 1GHz for XM in the commit message:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8743410d4971c5510a7d09293f5f3f89d8081059

Regards,
Nishanth Menon

Re: cpufreq support for the Beagleboard.

[Matt Johnson]

On 03/21/2011 08:24 AM, Vishwanath Sripathy wrote:
>> -----Original Message-----
>> From: javier Martin [mailto:javier.martin@vista-silicon.com]
>> Sent: Monday, March 21, 2011 5:40 PM
>> To: Vishwanath Sripathy
>> Cc: linux-omap@vger.kernel.org
>> Subject: Re: cpufreq support for the Beagleboard.
>>
>> Hi,
>> thank you for your fast answer.
>>
>> I've been testing the repository you pointed me and I found that only
>> 300MHz and 600MHz can be selected in the Beagleboard xM.
>> Couldn't we work until 1000MHz?
> 1G is disabled by default in OPP table I suppose. Pls enable it (in
> omap36xx_opp_def_list) if your board supports it.
My understanding was that the mainline kernel needed support for 
SmartReflex 1.5 and Adaptive Body Biasing (ABB), as found in TI's 
linux-omap-psp 2.6.32, before it was safe to enable the 1GHz OPP on the 
DM3730 (for e.g., Beagleboard xM).  Is this not the case?  Can we really 
just flip the bit in the OPP table?

>> Do you know what's left for those patches to enter mainline? Is
>> anybody working on it?
> OMAP cpufreq is undergoing some architecture/design changes and this is
> WIP.
>
> Vishwa
Thanks,
Matt

>> Thanks.
>>
>> --
>> Javier Martin
>> Vista Silicon S.L.
>> CDTUC - FASE C - Oficina S-345
>> Avda de los Castros s/n
>> 39005- Santander. Cantabria. Spain
>> +34 942 25 32 60
>> www.vista-silicon.com
> --
> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

RE: cpufreq support for the Beagleboard.

[Vishwanath Sripathy]

> -----Original Message-----
> From: Matt Johnson [mailto:johnso87@crhc.illinois.edu]
> Sent: Tuesday, March 22, 2011 12:15 AM
> To: Vishwanath Sripathy
> Cc: javier Martin; linux-omap@vger.kernel.org
> Subject: Re: cpufreq support for the Beagleboard.
>
> On 03/21/2011 08:24 AM, Vishwanath Sripathy wrote:
> >> -----Original Message-----
> >> From: javier Martin [mailto:javier.martin@vista-silicon.com]
> >> Sent: Monday, March 21, 2011 5:40 PM
> >> To: Vishwanath Sripathy
> >> Cc: linux-omap@vger.kernel.org
> >> Subject: Re: cpufreq support for the Beagleboard.
> >>
> >> Hi,
> >> thank you for your fast answer.
> >>
> >> I've been testing the repository you pointed me and I found that only
> >> 300MHz and 600MHz can be selected in the Beagleboard xM.
> >> Couldn't we work until 1000MHz?
> > 1G is disabled by default in OPP table I suppose. Pls enable it (in
> > omap36xx_opp_def_list) if your board supports it.
> My understanding was that the mainline kernel needed support for
> SmartReflex 1.5 and Adaptive Body Biasing (ABB), as found in TI's
> linux-omap-psp 2.6.32, before it was safe to enable the 1GHz OPP on the
> DM3730 (for e.g., Beagleboard xM).  Is this not the case?  Can we really
> just flip the bit in the OPP table?
Sorry, I should have been more explicit.
Yes you need to have ABB and SR enabled before enabling 1G.

Vishwa
>
> >> Do you know what's left for those patches to enter mainline? Is
> >> anybody working on it?
> > OMAP cpufreq is undergoing some architecture/design changes and
> this is
> > WIP.
> >
> > Vishwa
> Thanks,
> Matt
>
> >> Thanks.
> >>
> >> --
> >> Javier Martin
> >> Vista Silicon S.L.
> >> CDTUC - FASE C - Oficina S-345
> >> Avda de los Castros s/n
> >> 39005- Santander. Cantabria. Spain
> >> +34 942 25 32 60
> >> www.vista-silicon.com
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-omap"
in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html