2.6.21: longhaul freq-scaling broken

2.6.21: longhaul freq-scaling broken

[Jan Kiszka]

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Hi,

the new longhaul driver of 2.6.21 is broken on my Via Eden board.
Frequencies can no longer be switched by whatever governor.

# cat /proc/cpuinfo
processor       : 0
vendor_id       : CentaurHauls
cpu family      : 6
model           : 7
model name      : VIA Samuel 2
stepping        : 3
cpu MHz         : 598.000
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu de tsc msr cx8 mtrr pge mmx 3dnow
bogomips        : 1200.75
clflush size    : 32

I ported the longhaul driver from 2.6.20.7 to 2.6.21, it works fine.

Yeah, I know there are only a few patches between both, but I would like
to reduce the test cycles to a minimum. Any suggestion where to look
first is welcome therefore, ready-to-apply patches even more...

Thanks,
Jan


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Re: 2.6.21: longhaul freq-scaling broken

[Rafał Bilski]

> Hi,
Hi 
> the new longhaul driver of 2.6.21 is broken on my Via Eden board.
> Frequencies can no longer be switched by whatever governor.
> 
> # cat /proc/cpuinfo
> processor       : 0
> vendor_id       : CentaurHauls
> cpu family      : 6
> model           : 7
> model name      : VIA Samuel 2
> stepping        : 3
> cpu MHz         : 598.000
> cache size      : 64 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 1
> wp              : yes
> flags           : fpu de tsc msr cx8 mtrr pge mmx 3dnow
> bogomips        : 1200.75
> clflush size    : 32
> 
> I ported the longhaul driver from 2.6.20.7 to 2.6.21, it works fine.
Yes. My fault. Bug is known, but it was to late to include patch 
fixing it in 2.6.21
> Yeah, I know there are only a few patches between both, but I would like
> to reduce the test cycles to a minimum. Any suggestion where to look
> first is welcome therefore, ready-to-apply patches even more...
Longhaul ver. 2 support is the reason. First machine that was reported 
not working is exactly like Your's: Samuel 2 600MHz. Patch reverting 
changes is queued in cpufreq git. You can find it at
http://git.kernel.org/?p=linux/kernel/git/davej/cpufreq.git;a=commitdiff_plain;h=07844252ffd81ec192a62014bada1016c9703765
> Thanks,
> Jan
Regards
Rafał



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Re: 2.6.21: longhaul freq-scaling broken

[Rafał Bilski]

>> > Hi,
>> Hi
>> > the new longhaul driver of 2.6.21 is broken on my Via Eden board.
>> > Frequencies can no longer be switched by whatever governor.
>> > [...]
>> >
>> > I ported the longhaul driver from 2.6.20.7 to 2.6.21, it works fine.
>> Yes. My fault. Bug is known, but it was to late to include patch
>> fixing it in 2.6.21
>> > Yeah, I know there are only a few patches between both, but I would
>> like
>> > to reduce the test cycles to a minimum. Any suggestion where to look
>> > first is welcome therefore, ready-to-apply patches even more...
>> Longhaul ver. 2 support is the reason. First machine that was reported
>> not working is exactly like Your's: Samuel 2 600MHz. Patch reverting
>> changes is queued in cpufreq git. You can find it at
>> http://git.kernel.org/?p=linux/kernel/git/davej/cpufreq.git;a=commitdiff_plain;h=07844252ffd81ec192a62014bada1016c9703765
>>
> 
> Should it go to -stable?
If I understood Dave Jones correcly it is work in progress. 
> I have this on the list of known regressions already.
Can You send me more details? 
> Regards,
> Michal
Regards
Rafał

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