[lm-sensors] Problems with SMSC EMC2103-2

[lm-sensors] Problems with SMSC EMC2103-2

[sebl]

Hi,

somehow lm-sensors does not seem to recognize the EMC2103-2 chip in my
notebook (HP 2530p). When i run sensors-detect it says:

#Do you want to scan for Super I/O sensors? (YES/no): y
#Probing for Super-I/O at 0x2e/0x2f
#Trying family `National Semiconductor/ITE'... No
!#Trying family `SMSC'... Yes
!#Found unknown chip with ID 0x4501
#Probing for Super-I/O at 0x4e/0x4f
#Trying family `National Semiconductor/ITE'... No
#Trying family `SMSC'... No
#Trying family `VIA/Winbond/Nuvoton/Fintek'... No
#Trying family `ITE'... No

"Found unknown chip with ID 0x4501" But I'm 100% certain that it is the
EMC2103-2 chip which is described as support in the documentation. I can
load the driver with modprobe emc2103, but nothing happens. lm-sensors
only detects the temperature-sensors correctly, not the fan speed or
anything else. Are there known problems with this chip? Or is somenone
successfully running lm-sensors with EMC2103-2?

sensors -v
sensors version 3.3.2 with libsensors version 3.3.2

uname -r
3.2.0-24-generic-phc

best regards





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Re: [lm-sensors] Problems with SMSC EMC2103-2

[Jean Delvare]

On Sun, 27 May 2012 23:39:23 +0200, sebl@storm-clan.de wrote:
> Hi,
> 
> somehow lm-sensors does not seem to recognize the EMC2103-2 chip in my
> notebook (HP 2530p). When i run sensors-detect it says:
> 
> #Do you want to scan for Super I/O sensors? (YES/no): y
> #Probing for Super-I/O at 0x2e/0x2f
> #Trying family `National Semiconductor/ITE'... No
> !#Trying family `SMSC'... Yes
> !#Found unknown chip with ID 0x4501
> #Probing for Super-I/O at 0x4e/0x4f
> #Trying family `National Semiconductor/ITE'... No
> #Trying family `SMSC'... No
> #Trying family `VIA/Winbond/Nuvoton/Fintek'... No
> #Trying family `ITE'... No
> 
> "Found unknown chip with ID 0x4501" But I'm 100% certain that it is the
> EMC2103-2 chip which is described as support in the documentation.

How are you 100% certain? Did you read the top marking of the chip?

Me, I am 100% certain that the above is NOT an EMC2103-2, because it is
connected to the LPC bus while the EMC2103-2 is an SMBus chip. Can't be
the same chip.

The chip above is likely to be a HP-specific Super-I/O chip, maybe
Juerg (Cc'd) can identify it. There is no guarantee that it includes
hardware monitoring features though.

> I can
> load the driver with modprobe emc2103, but nothing happens.

This is expected for all SMBus-based drivers, devices can appear
afterward so drivers never refuse to load.

> lm-sensors
> only detects the temperature-sensors correctly, not the fan speed or
> anything else. Are there known problems with this chip? Or is somenone
> successfully running lm-sensors with EMC2103-2?

Driver was contributed by SMSC themselves (Steve Cc'd), I'm fairly
certain that they tested their code.

What could happen is that the SMBus controller to which the EMC2103-2
chip is connected, is not properly supported on your system. Maybe it
is a very recent chip we don't support yet, or maybe ACPI gets in the
way and prevents the driver from binding to the chip. I'd like to see
the complete output of sensors-detect and lspci.

Note BTW that it is very frequent for laptops to not include complete
hardware monitoring chips. Furthermore, the monitoring chip is usually
hidden behind ACPI so all you get is the limited ACPI thermal zone
interface, or some proprietary interface. You may want to give a try to
the hp_accel and hp-wmi modules for laptop-specific features support.

-- 
Jean Delvare

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Re: [lm-sensors] Problems with SMSC EMC2103-2

[Sebl]

Yes I'm 100% certain because I can read the top marking. It says: SMSC
EMC2103. So there is no! doubt. But I can send you pictures, if you want.
Hardwaremonitoring (Vcore, fan, ...) is possible with windows, so there
should be the possibility to monitor it with linux, too.
I can send you lspci later, but as far as I remember it only listed the
intel chipset drivers.
hp_wmi and hp_accel modules are automatically loaded @ startup.



-----Ursprüngliche Nachricht-----
Von: Jean Delvare [mailto:khali@linux-fr.org]
Gesendet: Montag, 28. Mai 2012 09:02
An: sebl@storm-clan.de
Cc: lm-sensors@lm-sensors.org; Steve Glendinning; Juerg Haefliger
Betreff: Re: [lm-sensors] Problems with SMSC EMC2103-2

On Sun, 27 May 2012 23:39:23 +0200, sebl@storm-clan.de wrote:
> Hi,
> 
> somehow lm-sensors does not seem to recognize the EMC2103-2 chip in my 
> notebook (HP 2530p). When i run sensors-detect it says:
> 
> #Do you want to scan for Super I/O sensors? (YES/no): y #Probing for 
> Super-I/O at 0x2e/0x2f #Trying family `National Semiconductor/ITE'...
> No !#Trying family `SMSC'... Yes !#Found unknown chip with ID 0x4501 
> #Probing for Super-I/O at 0x4e/0x4f #Trying family `National 
> Semiconductor/ITE'... No #Trying family `SMSC'... No #Trying family 
> `VIA/Winbond/Nuvoton/Fintek'... No #Trying family `ITE'... No
> 
> "Found unknown chip with ID 0x4501" But I'm 100% certain that it is 
> the
> EMC2103-2 chip which is described as support in the documentation.

How are you 100% certain? Did you read the top marking of the chip?

Me, I am 100% certain that the above is NOT an EMC2103-2, because it is
connected to the LPC bus while the EMC2103-2 is an SMBus chip. Can't be the
same chip.

The chip above is likely to be a HP-specific Super-I/O chip, maybe Juerg
(Cc'd) can identify it. There is no guarantee that it includes hardware
monitoring features though.

> I can
> load the driver with modprobe emc2103, but nothing happens.

This is expected for all SMBus-based drivers, devices can appear afterward
so drivers never refuse to load.

> lm-sensors
> only detects the temperature-sensors correctly, not the fan speed or 
> anything else. Are there known problems with this chip? Or is somenone 
> successfully running lm-sensors with EMC2103-2?

Driver was contributed by SMSC themselves (Steve Cc'd), I'm fairly certain
that they tested their code.

What could happen is that the SMBus controller to which the EMC2103-2 chip
is connected, is not properly supported on your system. Maybe it is a very
recent chip we don't support yet, or maybe ACPI gets in the way and prevents
the driver from binding to the chip. I'd like to see the complete output of
sensors-detect and lspci.

Note BTW that it is very frequent for laptops to not include complete
hardware monitoring chips. Furthermore, the monitoring chip is usually
hidden behind ACPI so all you get is the limited ACPI thermal zone
interface, or some proprietary interface. You may want to give a try to the
hp_accel and hp-wmi modules for laptop-specific features support.

--
Jean Delvare


_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors

Re: [lm-sensors] Problems with SMSC EMC2103-2

[Guenter Roeck]

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Re: [lm-sensors] Problems with SMSC EMC2103-2

[Jean Delvare]

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Re: [lm-sensors] Problems with SMSC EMC2103-2

[Guenter Roeck]

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Re: [lm-sensors] Problems with SMSC EMC2103-2

[Jean Delvare]

On Thu, 31 May 2012 13:56:06 -0700, Guenter Roeck wrote:
> On Thu, 2012-05-31 at 16:13 -0400, Jean Delvare wrote:
> > The SMBus controller is missing (should be at 00:1f.3.) This explains
> > why sensors-detect couldn't see the SMSC EMC2103 chip.
> > 
> > This is something that was often seen on ICH3/4/5/6 systems, and the
> > kernel includes code to unhide the SMBus on these old chipsets, but I
> > think the latest one covered is the ICH7. We'd need to do the same with
> > the ICH9.
> > 
> The current version of i2c-i801.c does support ich9. Am I missing
> something ? Is there a missing variant ?

I'm not talking about chip support, but about chip _unhiding_ support.
This happens in drivers/pci/quirks.c, look at functions
asus_hides_smbus_lpc and asus_hides_smbus_lpc_ich6.

So actually ICH6 is the last one handled there, not ICH7.

We also have a user-space script to do the same (in prog/hotplug) but
it only works up to ICH5.

-- 
Jean Delvare

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Re: [lm-sensors] Problems with SMSC EMC2103-2

[Guenter Roeck]

On Fri, Jun 01, 2012 at 03:50:37AM -0400, Jean Delvare wrote:
> On Thu, 31 May 2012 13:56:06 -0700, Guenter Roeck wrote:
> > On Thu, 2012-05-31 at 16:13 -0400, Jean Delvare wrote:
> > > The SMBus controller is missing (should be at 00:1f.3.) This explains
> > > why sensors-detect couldn't see the SMSC EMC2103 chip.
> > > 
> > > This is something that was often seen on ICH3/4/5/6 systems, and the
> > > kernel includes code to unhide the SMBus on these old chipsets, but I
> > > think the latest one covered is the ICH7. We'd need to do the same with
> > > the ICH9.
> > > 
> > The current version of i2c-i801.c does support ich9. Am I missing
> > something ? Is there a missing variant ?
> 
> I'm not talking about chip support, but about chip _unhiding_ support.
> This happens in drivers/pci/quirks.c, look at functions
> asus_hides_smbus_lpc and asus_hides_smbus_lpc_ich6.
> 
> So actually ICH6 is the last one handled there, not ICH7.
> 
Got it, thanks. Given the explanation in the file, I'd be a bit hesitant
to add a new entry unless we know for sure that it does not cause trouble.

On my ASUS board (P8H67-V) Linux loads the i2c-i801 driver, so I guess Asus
stopped the hiding games at some point.

Guenter

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Re: [lm-sensors] Problems with SMSC EMC2103-2

[Jean Delvare]

Again, please don't top-post, and please keep the list in Cc. This is
the last time I complain about that, next time I won't even read you.

On Fri, 01 Jun 2012 18:04:47 +0200, Sebastian Lefke wrote:
> Well it works perfectly with windows, so I don't know why it shouldn't 
> work with linux. ACPI isn't affected  and hwinfo32 monitors the values 
> and can even manipulate the fan speed. Afaik the editor of hwinfo32 just 
> unhides the sensors by changing the 'hiding'-bit.

It works with Windows. You can't say it works _perfectly_. If a race
condition exists, you may just have been lucky to not hit it yet. It
could also be that your monitoring application either skips ACPI
thermal zones when other monitoring devices are found, or serializes
the access to the various devices.

We can't do that easily in Linux, because the kernel drivers are
responsible for hardware access, and multiple applications can access
the interface exposed by these drivers. The applications are
independent, the kernel drivers too, so serializing is not possible, at
least not with the current model.

One possibility may be to use the hardware semaphore of the SMBus
controller, which I think was designed to solve this problem. However
it only works if the ACPI code itself (which comes with your BIOS)
checks the semaphore too. Last system where I checked, this wasn't the
case, so I gave up the whole idea.

If you provide a copy of your DSDT (/sys/firmware/acpi/tables/DSDT) we
may take a look at what exactly the ACPI BIOS is doing with the
EMC2103, and decide if using the hardware semaphore has a chance to
work. I wouldn't hold my breath though...

-- 
Jean Delvare

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