[linux-dvb] Dposh DVB-T USB2.0 seems to not work properly

Antti Palosaari crope at iki.fi
Tue Jun 24 08:30:17 CEST 2008

ma 23.6.2008 21:58 Andrew Websdale kirjoitti:
> 2008/6/19 Antti Palosaari <crope at iki.fi>:
>> Looks like small changes to m9206 driver is needed. MT2060 tuner needs
>>>> IF1, i2c-address and output clock bit (0/1 if I remeber correctly..).
>>>> Those can be seen from windows sniffs or by guessing / testing. IF1 is
>>>> easy to set default one, 1220, wrong IF1 only decreases performance.
>>>> If
>>>> there is eeprom used then value is normally read from there, otherwose
>>>> just set default. clock is easy to test. I don´t know how many
>>>> i2c-address
>>>> are supported by chip, but most probably there is not too many.
>>>> Hopefully
>>>> only 4. You can look from specs or from other drivers what
>>>> i2c-addresses
>>>> are used for mt2060. I think it will take 2-10 test to find correct
>>>> values
>>>> by trial and error method.
>> I've tried adding the mt2060 code - it compiles OK & does seem to be
>> nearly
>> right,the tuner is being recognised, but I think loading the module
>> causes
>> the I2c bit of the kernel to Oops - would an incorrect i2c address cause
>> this?
> Here's my dmesg output:
> m920x_mt2060_tuner_attach
> BUG: unable to handle kernel NULL pointer dereference at virtual address
> 0000006c

because you have passed tuner i2c-address as parameter to the dvb_attach()


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