Hi Guenter, Soren, Sorry for the late reply. Yes, one year, no kidding :( On Wed, 7 Aug 2013 12:25:56 -0700, Guenter Roeck wrote: > On Wed, Aug 07, 2013 at 02:19:42PM -0400, Soren Harward wrote: > > Yeah, that fixed it. Sensors are working properly now. > > > > My computer is a Lenovo D10, which uses the Intel 5400 chipset. > > Here's the lspci dump for the SMBus controller: > > > > root@jens:~# lspci -vv -s 0000:00:1f.3 > > 00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus > > Controller (rev 09) > > Subsystem: Lenovo Device 101d > > Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- > > ParErr- Stepping- SERR- FastB2B- DisINTx- > > Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium > > >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- > > Interrupt: pin B routed to IRQ 23 > > Region 4: I/O ports at 1100 [size=32] > > Kernel driver in use: i801_smbus > > > > So what else can I do to help debug this? > > I copied the i2c mailing list and the i2c maintainer, and also changed the > subject to reflect the real problem. I don't really know what else you cMSIan do. > Maybe Jean has an idea, or someone else on the list. The interrupt code in i2c-i801 has worked for a majority of users and brought up major performance improvements. So I'm not going to revert it. However I really would like to understand the few failure reports we had, and hopefully fix them. Soren, what's the status on your side? Are you still running a kernel with commit 6676a847 reverted? Note that you can also disable interrupt support in i2c-i801 manually by passing option disable_features=0x10 to the driver. Also I had one report of a problem with the same chipset you are using, and the reporter claims that kernel v3.16 no longer has the problem. We don't know why yet, but it might be worth a try. > One possibility is that the driver doesn't enable/use MSI interrupts. > Maybe that is causing trouble with your chipset. Another option might be > that there are subtle differences with this chipset, and the interrupt code > simply does not work with it. Guenter, I can confirm that the i2c-i801 driver only uses regular interrupts. The datasheet does not mention anything about MSI. What makes you think the problem could be related to the lack of MSI support? Thanks, -- Jean Delvare SUSE L3 Support -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
