Messages in this thread | | | Date | Fri, 07 Jan 2005 10:51:21 +0100 | From | Jean Delvare <> | Subject | Re: i2c: lost sensors with 2.6.10(-mm1) |
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J.A. Magallon wrote:
> I have lost my sensors info with 2.6.10, in particular -mm1. > They work fine with 2.6.9-mm1 (current state of the box, booted on > 2.6.9 or 10, no other difference). > (...) > I have noticed different contents in /sys: > under 2.6.9: > /sys/devices/platform/i2c-1: > /sys/devices/platform/i2c-1/1-0290: > /sys/devices/platform/i2c-1/1-0290/power: > /sys/devices/platform/i2c-1/power: > > under 2.6.10: > /sys/devices/platform/i2c-1: > /sys/devices/platform/i2c-1/power: > > So some /sys nodes are missing !!! > (the isa bus)
This basically means that the i2c client was not registered.
> Debug output from 2.6.10-mm1: > (...) > Jan 7 01:33:11 werewolf kernel: i2c-core: driver w83627hf registered. > Jan 7 01:33:11 werewolf kernel: i2c_adapter i2c-1: found normal isa entry for adapter 9191, addr 0290
However, this suggests that the driver loaded properly and the base address was correctly read from Super-I/O space. This would mean that the problem happened later, in w83627hf_detect(). The most likely reason for this would be if the region request failed (unfortunately we have no message, not even debug, if this happens).
> Some ideas ?
Three things to try, in order:
1* Compare /proc/ioports in 2.6.9-mm1 and 2.6.10-mm1. I suspect that the 0x290-0x297 range is held by some device in 2.6.10-mm1.
2* Try reverting this patch in 2.6.10-mm1: http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10/2.6.10-mm1/broken-out/bk-i2c.patch It does indeed include a change in the way the I/O region is requested. It should not make any difference, but maybe we are missing something and it actually does.
3* Try a vanilla 2.6.10 kernel and report how it is going.
Thanks, -- Jean Delvare - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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