[Nouveau] [Bug 60704] [nouveau, git regression] - I2C PWM fan control broken on nv50 adt7475 on kernels 3.3.x+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=60704

--- Comment #7 from Emil Velikov <emil.l.velikov at gmail.com> ---
Created attachment 74708
  --> https://bugs.freedesktop.org/attachment.cgi?id=74708&action=edit
Use 25kbps datarate for i2c transfers

The offending commit has been almost completely reverted later on

The only differences being
* timeout (5000 > 2200)
Data is based on the VESA spec
* bitrate (12,5kbps > 50kbps)
Bitrate of 50kbps is quite reasonable, considering the standards

There are a few possible solutions
A select correct delay depending on the i2c port type
B presence of adt7475(and other) i2c sensor(s) in the extdev vbios table
C use 25kbps for all transfers
D quirk it

Patch for option C is attached

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