jollyjoggler wrote:
> The teac UD-H01 has the Tenor TE8802 chipset.
>
> Have a look here
>
> http://pastebin.com/hiqpra58
>
> the frquency is jumping in between 183994 Hz and 199994 Hz while playing
> back a 192kHz file. So I assume this is the frequency corruption you are
> talking about.
>
> Could your patch be applied to other kernels which are not for ARM based
> machines like the SBT?
>
> Thank you!
Yes this looks similar. I did email Tenor, but they did not appear keen
on fixing Linux for some unknown reason.. Anyway as they've not
responded for a while, I thought I'm post my observations and the hack
thats in kernel 11:
Here's some logging we did with a Tenor device recording the feedback
frequencies:
Code:
--------------------
Example at 44.1kHz sample rate
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058340 freq: 44102 Hz set
feedback raw: 00068330 freq: 52100 Hz set <---- this looks wrong raw value
should be 00058330
feedback raw: 00068330 freq: 52100 Hz set <---- this looks wrong raw value
should be 00058330
feedback raw: 00068330 freq: 52100 Hz set <---- this looks wrong raw value
should be 00058330
feedback raw: 00058340 freq: 44102 Hz set
feedback raw: 00048330 freq: 36100 Hz ignored<---- this looks wrong raw value
should be 00058330
feedback raw: 00048330 freq: 36100 Hz ignored<---- this looks wrong raw value
should be 00058330
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058330 freq: 44100 Hz set
feedback raw: 00058340 freq: 44102 Hz set
feedback raw: 00068330 freq: 52100 Hz set <---- this looks wrong raw value
should be 00058330
feedback raw: 00068330 freq: 52100 Hz set <---- this looks wrong raw value
should be 00058330
feedback raw: 00068330 freq: 52100 Hz set <---- this looks wrong raw value
should be 00058330
feedback raw: 00068330 freq: 52100 Hz set <---- this looks wrong raw value
should be 00058330
Example at 48kHz
feedback raw: 00050000 freq: 40000 Hz ignored<---- this looks wrong raw value
should be 00060000
feedback raw: 00050000 freq: 40000 Hz ignored<---- this looks wrong raw value
should be 00060000
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060010 freq: 48002 Hz set
feedback raw: 00060010 freq: 48002 Hz set
feedback raw: 00060010 freq: 48002 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00070010 freq: 56002 Hz set <---- this looks wrong raw value
should be 00060000
feedback raw: 00070010 freq: 56002 Hz set <---- this looks wrong raw value
should be 00060000
feedback raw: 00070010 freq: 56002 Hz set <---- this looks wrong raw value
should be 00060000
feedback raw: 00070010 freq: 56002 Hz set <---- this looks wrong raw value
should be 00060000
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060010 freq: 48002 Hz set
feedback raw: 00060010 freq: 48002 Hz set
feedback raw: 00060010 freq: 48002 Hz set
feedback raw: 00060010 freq: 48002 Hz set
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00070000 freq: 56000 Hz set <---- this looks wrong raw value
should be 00060000
feedback raw: 00070000 freq: 56000 Hz set <---- this looks wrong raw value
should be 00060000
feedback raw: 00070000 freq: 56000 Hz set <---- this looks wrong raw value
should be 00060000
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00050010 freq: 40002 Hz ignored<---- this looks wrong raw value
should be 00060000
feedback raw: 00050010 freq: 40002 Hz ignored<---- this looks wrong raw value
should be 00060000
feedback raw: 00060000 freq: 48000 Hz set
feedback raw: 00060000 freq: 48000 Hz set
Example at 96 KHz
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000d0020 freq: 104004 Hz set
feedback raw: 000d0020 freq: 104004 Hz set
feedback raw: 000d0020 freq: 104004 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0010 freq: 96002 Hz set
feedback raw: 000d0020 freq: 104004 Hz set
feedback raw: 000d0020 freq: 104004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000c0020 freq: 96004 Hz set
feedback raw: 000d0020 freq: 104004 Hz set
feedback raw: 000d0020 freq: 104004 Hz set
--------------------
Essentially this mean that the 3rd byte of the feadback value is getting
corrupted and probably changing when it should not.
I suspect this can be made more general, but this is essentially what
kernel 11 is doing - it reads the feadback frequency in /sound/usb/urb.c
retire_playback_sync_urb and then modifies it to try to get around the
corruption after f is read:
Code:
--------------------
if (IS_TENOR) {
// automatic frequency detection can get this wrong at start of a new sample
rate so force to 0 which is the value for uac2
subs->freqshift = 0
// Tenor 8802 corrupts high order feedback bytes assume only low order 2
bytes change and use nominal frequency for high order bytes
f &= 0x0000ffff;
f |= (subs->freqn & 0xffff0000);
if (unlikely(f > subs->freqn && f - subs->freqn > 0x8000)) {
f -= 0x10000;
}
}
--------------------
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