ISA pnp & kernel 2.6

ISA pnp & kernel 2.6

[Michael Corlett]

I have an ISA pnp card (opti931) which stopped working when I
installed kernel 2.6 and the problem is as follows:

The kernel function that sets and activates the card is
isapnp_set_resources (in drivers/pnp/isapnp/core.c) and for
each resource, it is checking that the correct flag is set
before writing to the port (i.e. IORESOURCE_IO, IORESOURCE_IRQ,
IORESOURCE_DMA, IORESOURCE_MEM) however, these flags are never
being set because the driver code is just using
pnp_init_resource_table followed by pnp_resource_change for each
setting and so the configuration is never written to the card.
(I believe that the equivalent code in 2.4 just checked for
flags != 0).

As I see it, there are four options:

1) Manually set the flags in the driver code (this is what I have
    done temporarily to get the card working).


2) Change the test in isapnp_set_resources to

    ((flags & IORESOURCE_xx) | (~flags & IORESOURCE_AUTO))

    as anything that has been auto-allocated should have the
    appropriate flag set.


3) Change pnp_resource_change to clear IORESOURCE_UNSET and change
    the test in isapnp_set_resources to

    (~flags & IORESOURCE_UNSET)


4) In the driver, use something else apart from pnp_resource_change
    (i.e. is there now a preferred method for filling in the
    settings).


I prefer 3) or else 2) but are there any reasons not to do this?
Any advice welcome.


Michael.








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Re: ISA pnp & kernel 2.6

[Takashi Iwai]

At Wed, 11 Feb 2004 21:57:35 +0000,
Michael Corlett wrote:
> 
> 
> I have an ISA pnp card (opti931) which stopped working when I
> installed kernel 2.6 and the problem is as follows:
> 
> The kernel function that sets and activates the card is
> isapnp_set_resources (in drivers/pnp/isapnp/core.c) and for
> each resource, it is checking that the correct flag is set
> before writing to the port (i.e. IORESOURCE_IO, IORESOURCE_IRQ,
> IORESOURCE_DMA, IORESOURCE_MEM) however, these flags are never
> being set because the driver code is just using
> pnp_init_resource_table followed by pnp_resource_change for each
> setting and so the configuration is never written to the card.
> (I believe that the equivalent code in 2.4 just checked for
> flags != 0).

did you try the latest 2.6.3-rc kernel?
many pnp fixes are included.


Takashi


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Re: ISA pnp & kernel 2.6

[Michael Corlett]

Takashi Iwai wrote:
> At Wed, 11 Feb 2004 21:57:35 +0000,
> Michael Corlett wrote:
> 
>>
>>I have an ISA pnp card (opti931) which stopped working when I
>>installed kernel 2.6 and the problem is as follows:
>>
>>The kernel function that sets and activates the card is
>>isapnp_set_resources (in drivers/pnp/isapnp/core.c) and for
>>each resource, it is checking that the correct flag is set
>>before writing to the port (i.e. IORESOURCE_IO, IORESOURCE_IRQ,
>>IORESOURCE_DMA, IORESOURCE_MEM) however, these flags are never
>>being set because the driver code is just using
>>pnp_init_resource_table followed by pnp_resource_change for each
>>setting and so the configuration is never written to the card.
>>(I believe that the equivalent code in 2.4 just checked for
>>flags != 0).
> 
> 
> did you try the latest 2.6.3-rc kernel?
> many pnp fixes are included.
> 

I have just tried rc2 and it is indeed fixed.  Thankyou.

Michael.


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