cpufreq driver stopped working on RPI4

[Mark Millard]

On 2021-Feb-28, at 11:37, Emmanuel Vadot <manu at bidouilliste.com> wrote:


> Hi Mike,
> 
> On Sat, 27 Feb 2021 16:28:52 -0600
> Mike Karels <mike at karels.net> wrote:
> 
>> Thanks, Mark.  Meanwhile, I just tested BETA4; much to my surprise,
>> the cpufreq driver configured again.  I didn't notice a relevant change,
>> but it is working...
>> 
>> 		Mike
> 
> Here is the commit you were looking for : 
> https://cgit.freebsd.org/src/commit/?id=1cf282363101f5d99b1dadfb0d3250bbe6f482a5
> 
> Note that there is still a problem with xhci, see
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252971#c25 for how to
> fix that for now. I'll update the rpi-firmware ports next week.

I'll note that for the xhci issue:

https://github.com/Hexxeh/rpi-firmware/commit/ca28024e2a78d6b1a05db5bbb77f6543fe569957
https://github.com/raspberrypi/firmware/commit/787227279ea72eb4bbf9ab077bd17336fe2158d8

was the release of the update to master for the 2 copies
but another firmware bugfix for a problem that messed up use
of DMA channel 6 got a release the next day (2021-Feb-25):

https://github.com/Hexxeh/rpi-firmware/commit/f73375d989151f7568e634140d3c4a13044921b2
https://github.com/raspberrypi/firmware/commit/5985247fb75681985547641d66196c77499f26b9

There is no tagged version in https://github.com/raspberrypi/firmware/
yet (as of when I just looked).


https://github.com/pftf/RPi4 has picked up the changes in v1.23
for with its EDK2 builds and has updated EDK2 again in v1.24 .

> Cheers,
> 
>> Mark wrote:
>>>> On 2021-Feb-27, at 09:42, Mike Karels <mike at karels.net> wrote:
>>>> 
>>>> Following up on my previous post (below): I tried the ALPHA1 kernel on
>>>> a BETA3 system on the RPI4, and it fails to attach the cpufreq driver
>>>> as well.  So it appears that the problem is in the dtb, etc, not the
>>>> kernel.
>>>> 
>>>> It would be nice to get this fixed before the 13.0 release.  Without
>>>> the cpufreq driver, the CPU is stuck at a low clock rate.
>> 
>>> In config.txt for an RPi4B I use (as an example, you
>>> could use other figures):
>> 
>>> over_voltage=6
>>> arm_freq=2000
>>> arm_freq_min=2000
>>> sdram_freq_min=3200
>> 
>>> and in /etc/sysctl.conf I have:
>> 
>>> # The u-boot'ed RPi4B does not seem to automatically
>>> # adjust from 600MHz, so do so manually. Presumes
>>> # config.txt does over_voltage=6 and arm_freq=2000 .
>>> # NOTE: without an appropriate over_voltage a
>>> # dev.cpu.0.freq=2000 will crash the RPi4B on the
>>> # spot.
>>> dev.cpu.0.freq=2000
>> 
>>> Overall this gives a constant faster frequency
>>> for the CPU (and the sdram). (I have a good power
>>> supply context for this.)
>> 
>>> You may or may not be able to tolerate the constant
>>> status for frequencies. But there is this alternative
>>> to cpufreq use.
>> 
>> 
>>>> 		Mike
>>>> 
>>>>> To: freebsd-arm at freebsd.org
>>>>> From: Mike Karels <mike at karels.net>
>>>>> Reply-to: mike at karels.net
>>>>> Subject: cpufreq driver stopped working on RPI4
>>>>> Date: Sun, 21 Feb 2021 14:43:27 -0600
>>>> 
>>>>> I upgraded an older (original) RPI4, 4 GB, to 13.0-BETA3, and merged my
>>>>> previous rc.conf including powerd.  Powerd fails to start now, saying
>>>>> that there is no cpufreq(4) support.  Sure enough, dmesg has the following
>>>>> relevant lines:
>>>> 
>>>>>   bcm2835_cpufreq0: <CPU Frequency Control> on cpu0
>>>>>   bcm2835_cpufreq0: Unable to find firmware device
>>>>>   device_attach: bcm2835_cpufreq0 attach returned 6
>>>>>   armv8crypto0: CPU lacks AES instructionsbcm2835_cpufreq0: <CPU Frequency Control> on cpu0
>>>>>   bcm2835_cpufreq0: Unable to find firmware device
>>>>>   device_attach: bcm2835_cpufreq0 attach returned 6
>>>> 
>>>>> (Yes, armv8crypto is missing a newline.)
>>>> 
>>>>> I checked the most recent system I had on the shelf, which was 13.0-ALPHA1.
>>>>> It has this:
>>>> 
>>>>>   bcm2835_firmware0: <BCM2835 Firmware> on simplebus0
>>>>>   ofw_clkbus1: <OFW clocks bus> on bcm2835_firmware0
>>>>>   gpio0: <Raspberry Pi Firmware GPIO controller> on bcm2835_firmware0
>>>>>   bcm2835_cpufreq0: <CPU Frequency Control> on cpu0
>>>>>   bcm2835_cpufreq0: ARM 600MHz, Core 200MHz, SDRAM 400MHz, Turbo OFF
>>>> 
>>>>> Does anyone know what changed to cause this?  Was it the FDT update?


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)