[Openchrome-users] DVI-02 funkiness

[Philip Prindeville]

Well, I'm going through my Xorg.0.log on my SP-13000, and
seeing in it:

(II) VIA(0): ViaI2CBus3Init
(II) VIA(0): I2C bus "I2C bus 3" initialized.
(II) VIA(0): ViaI2CScan: Scanning I2C bus 2
(II) VIA(0): ViaI2CScan: Scanning I2C bus 3
(--) VIA(0): Found slave on I2C bus 3 - 0x40
(--) VIA(0): Found slave on I2C bus 3 - 0x70
(--) VIA(0): Found slave on I2C bus 3 - 0x74
(--) VIA(0): Found slave on I2C bus 3 - 0xA0


so I hacked up a driver to try to read a byte from Bus 3, address 0x70,
sub-address 0x00: which should be the first byte of the Sil164 device...
but the read fails.

So...  why is the read failing?  Is the bus not being
initialized with the correct timings?

Or are there things that don't have stuff starting at sub-address 0?

Also, going through the Via drivers to try to figure how they do
things...  I notice that they also probe using something called
GPIOI2C_*

Not sure what that is.  Is there another I2C bus that isn't
accessible with the xf86i2c.c code?  Has anyone else pored over
that part of the VT code?

Thanks,

-Philip