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SubjectRe: and Asus L3C : problematic change found, can be reverted. Real fix still missing
Karol Kozimor wrote:
> Okay, so I think I've finally got what's happening here.
> Enabling the SMBus device (00:1f.3) seems to mess up the resource
> reservation code, specifically the 0xe800 port region. Here's the diff
> between acpi=off and the same kernel with no arguments:

Hi Karol,

This is the same problem on every asus motherboard including very old
ones like my A7V : the ACPI pre-allocates the ioport region for the SMB
bus because the DTSD contain indication to do so and special care should
be used in order to reuse the IO port range already owned by ACPI

See :

And especially the end of /proc/oprots current one (before ACPI fix, I
was forced to avoid/not fail ioport reservation for SMB in i2c-viapro.c)

e800-e80f : 0000:00:04.4 <===============
e800-e80f : motherboard

But with the shaohua li proposed fix for
<>, i2c-viapro.c becomes owner
of part of this ioport range:

e800-e80f : 0000:00:04.4
e800-e80f : motherboard
e800-e807 : viapro-smbus <========

So in other words, it is possible either to force reallocation of an
ioport range already owned by ACPI now (at least in some configuration)
or to avoid this io port allocation has it is already mapped like my
proposed kludge to make A7V work...

However :
1) I have no clue however of the correct way to do this,
2) I do not know if the fix for
<> is also valid for this ASUS
3) I still would like to know what you want to do with the SMB bus...

-- eric

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