Re: [PATCH] i810fb: Do not probe the third i2c bus by default

["Antonino A. Daplas" <adaplas@gmail.com>]

Andrew Morton wrote:
> "Antonino A. Daplas" <adaplas@gmail.com> wrote:
>>
>>  Some time before 2.6.15, a third DDC channel was added to i810fb.
>>  On systems where these ddc pins are not connected, the probe
>>  takes about 10 seconds.
>>
>>  Add a boot/module  option for i810fb to explicitly probe for the 3rd
>>  ddc bus if needed.
> 
> argh.  We really shouldn't be adding options like this.  People just won't

Me too.

> know that the option exists and they'll sit there wondering why their
> kernel doesn't work right.  Or we invert the sense of the option and they
> sit there wondering why the bootup is so slow.

Well the 3rd i2c bus is undocumented, even by Intel. But it's supposed to
exist to allow attaching of daughter cards. I added support for this on the
prodding of Nicholas Boichat. As far as I know, nobody uses this 3rd bus.

> 
> Is there not any way in which to fix this so things just work?  A 10-second
> timeout sounds crazy.

The only way to know if this bus exists is to probe it, unfortunately. And
because it's undocumented, I don't which chipset type has it.  So anyone who
has knowledge of this undocumented feature will probably have the energy
to search for the proper boot option, or know where to mail me :-)

Tony
 




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