[linux-dvb] Re: Siemens DVB-C, MSP3400 I2C adressing problem

[Anders Gunnarsson <d00guan@dtek.chalmers.se>]

Anders Gunnarsson wrote:

> Hello all,
>
> Since my my siemens analog module is one of those who don't like to be 
> recognised i decided to give some time to check why.
>
> The funny thing that happened when I installed the module on the card 
> this time, was that it was recognised and could controll the volume 
> (the function I want to get started). When I reloaded the driver 
> modules the analog-module wasn't recognised and has not been since 
> then. I've tested drivers from 20031013 to latest 2.4 from the cvs.
> I can also add that the analog-module worked under WinXP without 
> problem, both audio & video.
>
> From what I've seen so far the MSP3400 is not adressable over the 
> I2C-bus, I get return-code -121 for read and write to id 80 (84 & 88 
> should not work but I've tested them as well).
> The saa7113, also on the analog-module, is however adressable, so no 
> problem with the I2C-bus there.
>
> Any ideas to what could be causing this problem, when it works first 
> time after mounted on the card and then not? I guess it should work 
> also if the power is disconnected for some time.
>
> I would also like to get any sort of helpful information on the card, 
> like: how the MSP is connected to other components on the card, how 
> the I2C is adressed from the drivers, logs from windows drivers, 
> possible tests to do, etc...
>
> /Anders
>
> System:
> Fujitsu Ergo-X PII-266, 192MB ram
> Siemens DVB-C rev 1.5
> Suse 9.0
As I suspected earlier the analog-module works fine the first time the 
the computer is started after beeing out of power for a while. After the 
driver modules are removed and the inserted again it's not recognised.
The MSP3400 must be left in some state where it's not accessible over 
the I2C-bus anymore when the driver modules are removed and/or reloaded. 
Since the power-off needs to be long for the MSP (or whichever component 
that causes this) to reset I havn't been able to try more.

Any ideas to what might happen that causes this? Does anyone know if the 
MSP standby-pin is hardwired or controllable from another component?

/Anders