i2c adapter on i852/855

i2c adapter on i852/855

[Hans-Jürgen Koch]

I'm using intelfb from 2.6.20-rc3 on an embedded board with an i852/855 and an 
i801. My .config contains

CONFIG_FB_INTEL=y
CONFIG_FB_INTEL_I2C=y
CONFIG_I2C=y
CONFIG_I2C_ALGOBIT=y

Problem is that no i2c adapter from this driver shows up 
in /sys/class/i2c-adapter, while the adapter registered by i2c_i801 is there.

I can make the i2c adapter of the i852/855 work with a modified version of 
i2c-i810, but this module is deprecated, so I'd like to use intelfb only.

Can somebody confirm that it actually works? What could be wrong?

Hans
 

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Re: i2c adapter on i852/855

[Hans-Jürgen Koch]

Am Donnerstag, 18. Januar 2007 15:35 schrieb Hans-Jürgen Koch:
> I'm using intelfb from 2.6.20-rc3 on an embedded board with an i852/855 and
> an i801. My .config contains
>
> CONFIG_FB_INTEL=y
> CONFIG_FB_INTEL_I2C=y
> CONFIG_I2C=y
> CONFIG_I2C_ALGOBIT=y
>
> Problem is that no i2c adapter from this driver shows up
> in /sys/class/i2c-adapter, while the adapter registered by i2c_i801 is
> there.
>
> I can make the i2c adapter of the i852/855 work with a modified version of
> i2c-i810, but this module is deprecated, so I'd like to use intelfb only.
>
> Can somebody confirm that it actually works? What could be wrong?
>
> Hans

Alright, should have had a look at the logs first. There's a message saying

intelfb: Cannot reserve FB region.

So intelfb is probably not running at all. Video comes from a vesafb or 
vga16fb that are also loaded...

Hans


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Re: i2c adapter on i852/855

[Hans-Jürgen Koch]

Am Donnerstag, 18. Januar 2007 17:42 schrieb Hans-Jürgen Koch:
> Am Donnerstag, 18. Januar 2007 15:35 schrieb Hans-Jürgen Koch:
> > I'm using intelfb from 2.6.20-rc3 on an embedded board with an i852/855
> > and an i801. My .config contains
> >
> > CONFIG_FB_INTEL=y
> > CONFIG_FB_INTEL_I2C=y
> > CONFIG_I2C=y
> > CONFIG_I2C_ALGOBIT=y
> >
> > Problem is that no i2c adapter from this driver shows up
> > in /sys/class/i2c-adapter, while the adapter registered by i2c_i801 is
> > there.
> >
> > I can make the i2c adapter of the i852/855 work with a modified version
> > of i2c-i810, but this module is deprecated, so I'd like to use intelfb
> > only.
> >
> > Can somebody confirm that it actually works? What could be wrong?
> >
> > Hans
>
> Alright, should have had a look at the logs first. There's a message saying
>
> intelfb: Cannot reserve FB region.
>
> So intelfb is probably not running at all. Video comes from a vesafb or
> vga16fb that are also loaded...
>
> Hans

I compiled a new kernel without vesafb and vga16fb, now intelfb initializes 
cleanly, and the i2c adapter is visible. These drivers don't work together 
too well...

Problem is solved for me, sorry for the noise.

Hans

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