[Nouveau] Bisect: i2c regression in 63daa9589cb88617d9cc8a0b0282564682a975b7

[Vincent Pelletier]

Hi.

Updating nouveau module to a newer git revision, I noticed I lost hwmon.

I ran a bisect, which identified 63daa9589cb88617d9cc8a0b0282564682a975b7 as 
being the first bad commit.

Adding printk traces, I saw that probing i2c bus 3 for sensors always failed 
with -EIO (no ack from slave). After reading the code, remembering how i2c 
works and reading sample code on wikipedia, I couldn't identify any 
algorythmic problem.

So I gave a try at changing delays. I doubled T_RISEFALL and T_HOLD, and the 
adt7473 chip could be detected & used again. I haven't tested other 
combination, nor tried to link those delays with any datasheet.

My card is a GTX 280.

Regards,
-- 
Vincent Pelletier