[U-Boot] [PATCH v2 1/2] imx: mx6: add get_cpu_speed_grade_hz func to return MHz speed grade from OTP

Troy Kisky
2015-05-15T22:34:41Z

On 5/15/2015 1:43 PM, Troy Kisky wrote:
> On 5/15/2015 1:38 PM, Tim Harvey wrote:
>> On Fri, May 15, 2015 at 12:54 PM, Troy Kisky
>> <troy.kisky@boundarydevices.com> wrote:
>>> On 5/15/2015 7:32 AM, Stefano Babic wrote:
>>>> Hi Christian,
>>>>
>>>> On 15/05/2015 16:26, Christian Gmeiner wrote:
>>>>
>>>>>> Function does not returns the value of the fuse, else it should returns
>>>>>> val. The value is parsed for consistency, and if it is not, 0 means a
>>>>>> failure. IMHO this interpretation is correct - I would agree with you
>>>>>> only if the return value would be the read value, but it is not.
>>>>>>
>>>>>
>>>>> If all mx6 variants use the same otp register/values, then the
>>>>> ifs are _NOT_ needed. I hope that later testings/doc updates/etc
>>>>> proofs it and we can get rid of the superfluous ifs.
>>>>>
>>>>
>>>> Ok - let's see if this can be proofed. It looks like we have to test and
>>>> ask the hardware for that instead of relying on the documentation.
>>>>
>>>> Best regards,
>>>> Stefano Babic
>>>>
>>>
>>> On our imx6sx board the patch outputs
>>>
>>> U-Boot 2015.04-00074-g1bd6819 (May 15 2015 - 12:44:22)
>>>
>>> CPU: Freescale i.MX6SX rev1.0 996 MHz (running at 792 MHz)
>>> Reset cause: WDOG
>>> Board: Nitrogen6sx
>>> ______________
>>>
>>>
>>> Did you want me to test some variation of this?
>>>
>>> Thanks
>>> Troy
>>
>> Troy,
>>
>> As far as the frequency grade goes if you know the actual part number
>> is a 1GHz part then that looks good - thanks for the test!
>
> Right, it is a 1GHz part.
>
>>
>> Could you provide similar results for the thermal grade patch series
>> as well? (you will need to enable imx6 thermal sensor and remove the
>> if (!imx6sx) around the print).
>
> Will do.
>
>>
>> Thanks!
>>
>> Tim
>>

Ok. I think I gave bad info

The part number is PCIMX6X4AVM08AA, which should be -40 to 125 C, 800 MHz

and u-boot prints

U-Boot 2015.07-rc1-01048-gc4f95cb-dirty (May 15 2015 - 14:46:05)

CPU: Freescale i.MX6SX rev1.0 996 MHz (running at 792 MHz)
CPU: Extended Commercial temperature grade (-20C to 105C)
_______________

U-boot then freezes in "uclass_get_device(UCLASS_THERMAL, 0, &thermal_dev);"

Troy