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    SubjectRe: [lm-sensors] 2.6.15: lm90 0-004c: Register 0x13 read failed (-1)
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    On Sunday 15 January 2006 00:45, Andrey Borzenkov wrote:
    > On Sunday 15 January 2006 00:20, Jean Delvare wrote:
    > > Hi Andrey,
    > >
    > > > Vanilla 2.6.15 on Toshiba Portege 4000. I get constant messages in
    > > > dmesg:
    > > >
    > > > i2c_adapter i2c-0: Error: command never completed
    > > > lm90 0-004c: Register 0x1 read failed (-1)
    > > > i2c_adapter i2c-0: Error: command never completed
    > > > lm90 0-004c: Register 0x14 read failed (-1)
    > > > i2c_adapter i2c-0: Error: command never completed
    > > > lm90 0-004c: Register 0x8 read failed (-1)
    > > > i2c_adapter i2c-0: Error: command never completed
    > > > lm90 0-004c: Register 0x0 read failed (-1)
    > > >
    > > > for quite a number of registers. Apparently I can read sensors just
    > > > fine still I am uneasy seeing those.
    > >
    > > Before 2.6.15, the lm90 driver did not handle read errors in any way,
    > > so they were probably already there, you simply were not aware of it.
    > > However, I guess that you already had the "command never completed"
    > > errors? These come from the i2c-ali1535 bus driver.
    >
    > Before 2.6.15 I run Mandriva kernel 2.6.12-12mdk. I do not remember them
    > but may be I just never actually looked in dmesg :)
    >
    > > It would be possible to add a retry-on-failure mechanism in the lm90
    > > driver. However, the real problem is more likely in the i2c-ali1535
    > > driver so fixing this one driver would be preferable.
    > >
    > > > eeprom-i2c-0-50
    > > > Adapter: SMBus ALI1535 adapter at ef00
    > > > Memory type: SDR SDRAM DIMM
    > > > Memory size (MB): 256
    > > >
    > > > adm1032-i2c-0-4c
    > > > Adapter: SMBus ALI1535 adapter at ef00
    > > > M/B Temp: +43°C (low = -65°C, high = +127°C)
    > > > CPU Temp: +47.6°C (low = +43.0°C, high = +51.0°C) ALARM
    > > > M/B Crit: +127°C (hyst = +122°C)
    > > > CPU Crit: +100°C (hyst = +95°C)
    > >
    > > Do you also have "command never completed" errors without an associated
    > > error from the lm90 driver?
    >
    > yes, on boot.
    >
    > > This would suggest that the eeprom driver
    > > too is triggering errors, which in turn would confirm that we need to
    > > fix the i2c-ali1535 driver rather than adding a workaround to the lm90
    > > driver.
    > >
    > > It looks like the i2c-ali1535 driver as it exists in the lm_sensors CVS
    > > repository (for Linux 2.4 kernels) did receive a major change in March
    > > 2005. These changes were supposed to "fix stability problems" (by
    > > adding delay loops pretty much everywhere). They were never ported to
    > > the Linux 2.6 version of the driver. Maybe we should try doing so now.
    > >
    > > This is a 400 lines patch, porting it won't be trivial, I am not
    > > familiar with this driver myself and I don't have a chip to test my
    > > changes on, so if someone else wants to take his/her chance, go. If
    > > not, I'll do it.
    > >
    > > Andrey, will you be able to test a i2c-ali1535 patch if we come up with
    > > one?
    >
    > Yes. Send me a patch (or give a link) and I'll try what I can do to port
    > it. I ask if I have a question :)
    >

    Do you mean revision 1.21 with date: 2005/03/27 02:22:10; author: mds? I
    checked and this one seems to be in current 2.6.15.1 kernel. I did not check
    if there were any omissions comparing with CVS but current kernel does
    contain and use ali1535_transaction() added by mentioned patch.

    - -andrey
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