2016-08-01 19:50 GMT+03:00 Viresh Kumar <viresh.kumar@xxxxxxxxxx>:
> On 31-07-16, 23:31, Matwey V. Kornilov wrote:
>> Hello,
>>
>> I've also just found that the same commit breaks cpufreq on BeagleBone Black :)
>>
>> So, probably without HCD_BH flag musb works correctly only at 1Ghz CPU
>> frequency, which is unlisted and being set to 720Mhz by cpufreq driver
>> (as it did whet there was cpufreq driver).
>>
>> 2016-07-29 21:01 GMT+03:00 Matwey V. Kornilov <matwey@xxxxxxxxxx>:
>> > Hello,
>> >
>> > I've found that the following commit fixes the issue:
>> >
>> > commit 7694ca6e1d6f01122f05039b81f70f64b1ec4063
>> > Author: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
>> > Date: Fri Apr 22 16:58:42 2016 +0530
>> >
>> > cpufreq: omap: Use generic platdev driver
>> >
>> > The cpufreq-dt-platdev driver supports creation of cpufreq-dt platform
>> > device now, reuse that and remove similar code from platform code.
>
> Sorry for this commit and the man hours wasted to get to this :(
>
> I am trying to figure out why things break though, as this patch shouldn't have
> had any functional impacts. So, some of the assumptions I had are surely
> incorrect..
Actually, nothing to sorry about.
I suppose, that with this patch my BeagleBone run at 1Ghz after boot,
because usually cpufreq limits it to 720Mhz saying
[ 14.255646] cpu cpu0: dev_pm_opp_set_rate: failed to find current
OPP for freq 1000000000 (-34)
And actually musb is still broken after f551e13529833e052f75ec628a8af7
(" Revert "usb: musb: musb_host")
>
> The defconfig linked in the original thread [1] has this:
>
> CONFIG_CPUFREQ_DT=m
>
> So, the cpufreq-dt module needs to get inserted to make it work.
>
It has been inserted automatically by alias `platform:cpufreq-dt'
Issue here that 4.7 stopped to provide `platfrom:cpufreq-dt' on BeagleBone.
Have you received my patch fixing it yet?
> Can someone provide the output of:
>
> cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
>
> with and without this patch ?
With this patch, there is no cpufreq directory here.
Without this patch, the output is the following:
nohostname:~ # uname -a
Linux nohostname 4.6.4-3.gecd9058-default #1 SMP PREEMPT Fri Jul 15
08:08:50 UTC 2016 (ecd9058) armv7l armv7l armv7l GNU/Linux
nohostname:~ # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
cpufreq-dt
>
> It looks like we wanted to select "omap-cpufreq" for beaglebone and selected
> "cpufreq-dt" by mistake.
No, I am not sure, cpufreq-dt worked well until v4.7 where it is disappeared.
>
> [Note]: I am not subscribed to USB lists and so please include me for any emails
> you want my response on.
>
> --
> viresh
>
> [1] http://www.spinics.net/lists/linux-usb/msg143956.html
>
> --
> viresh
>
--
With best regards,
Matwey V. Kornilov.
Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382
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