[linux-dvb] Re: Busy waiting in i2c_busy_rise_and_fall (was: Re: Re: full featured card without signal and required video memory investigation)

["Robert Schlabbach" <robert_s@gmx.net>]

From: "Ralph Metzler" <rjkm@metzlerbros.de>
> Btw., on one PC (Duron 1200, KT7) here the faster I2C timing
> breaks tuning. Anything below BUS_BIT_RATE_3200 does not work
> reliably. On a different board (Athlon XP2400+, KT400) with
> the same DVB card type it works fine.

Hmmm, how could this happen? It shouldn't be an issue with the speed at
which the CPU is feeding the I2C registers. Is it possible that this
motherboard (or the power supply) has such "dirty" supply voltages on the
PCI bus that those disturb the I2C lines...?

BTW, you didn't mention what _card_ you were using. Do all SAA7146A-based
DVB cards fail in this machine at higher I2C data rates, or only a specific
one?

Regards,
--
Robert Schlabbach
e-mail: robert_s@gmx.net
Berlin, Germany



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