[Bug 58541] New: [pandaboard] cpu frequency limitation

[Bug 58541] New: [pandaboard] cpu frequency limitation

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https://bugzilla.kernel.org/show_bug.cgi?id=58541

           Summary: [pandaboard] cpu frequency limitation
           Product: Power Management
           Version: 2.5
    Kernel Version: 3.9.3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@vger.kernel.org
        ReportedBy: liquid.acid@gmx.net
        Regression: No


Created an attachment (id=102051)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=102051)
dmesg output after boot

Hello,

the ARMv7 in the Pandaboard ES (OMAP4460) should support a maximum frequency of
around 1.2GHz.

However it looks like that it's currently limited to 920MHz.

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:
350000 700000 920000

Even worse:

cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 
699977

Greets,
Tobias

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[Bug 58541] [pandaboard] cpu frequency limitation

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https://bugzilla.kernel.org/show_bug.cgi?id=58541





--- Comment #1 from Tobias Jakobi <liquid.acid@gmx.net>  2013-05-20 14:33:08 ---
Created an attachment (id=102061)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=102061)
kernel config

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[Bug 58541] [pandaboard] cpu frequency limitation

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https://bugzilla.kernel.org/show_bug.cgi?id=58541


Nishanth Menon <nm@ti.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nm@ti.com




--- Comment #2 from Nishanth Menon <nm@ti.com>  2013-05-20 19:48:16 ---
This is correct - *ONLY* 920MHz will be supported by default without AVS Class
1.5, Adaptive Body Bias(ABB) support enabled. ABB and AVS class 1.5 is
mandatory for frequencies 1.2GHz and 1.5GHz to be enabled.

For PandaBoard ES, we also have additional constraint. MPU voltage is supplied
by TPS62391 PMIC chip which can only be controlled from I2C_SR.

we DONOT have any form of support for pmic control over i2c_sr.

Current status:
a) ABB support - currently blocked due to lack of clock node support in OF.
   i) ABB driver support and DTS conversion:
http://marc.info/?l=linux-omap&m=136751559523901&w=2
   ii) Clock node support preventing this from being merged in:
http://marc.info/?t=136804008400001&r=1&w=2
b) TPS62361 support and hence voltage control over i2c_sr -> to be posted in
linux-omap mailing list this week -
https://github.com/nmenon/linux-2.6-playground/commits/devel/vc-vp-regulator
has the prelim patches undergoing TI internal review.

In short - this was never a feature that k.org had support till date.

For full conversion, see the overview steps I posted here:
https://plus.google.com/u/0/112464029509057661457/posts/gvyZQcNieoq

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[Bug 58541] [pandaboard] cpu frequency limitation

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https://bugzilla.kernel.org/show_bug.cgi?id=58541





--- Comment #3 from Nishanth Menon <nm@ti.com>  2013-05-20 19:49:58 ---
I think this should be assigned to linux-omap instead of cpufreq btw.

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[Bug 58541] [pandaboard] cpu frequency limitation

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--- Comment #4 from Tobias Jakobi <liquid.acid@gmx.net>  2013-05-20 20:58:16 ---
Thanks for the update. It's good to know that you guys are working on it!

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[Bug 58541] [pandaboard] cpu frequency limitation

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Lan Tianyu <tianyu.lan@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tianyu.lan@intel.com
          Component|cpufreq                     |ARM
         AssignedTo|cpufreq@vger.kernel.org     |linux-arm-kernel@lists.arm.
                   |                            |linux.org.uk
            Product|Power Management            |Platform Specific/Hardware




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