Problem with mini-PCI-E slot on P2020RDB

Mahajan Vivek-B08308 B08308 at
Thu Dec 17 18:59:45 EST 2009

> From: 
> at lists.ozlabs.
> org 
> [ at lists
>] On Behalf Of Felix Radensky
> Sent: Thursday, December 17, 2009 12:52 PM
> >
> > I just noticed a MSI enable bit in 
> > drivers/net/wireless/ath/ath9k/reg.h
> > as under, may be we need to trun this on:-
> >
> > reg.h:1013:#define AR_PCIE_MSI                              0x4094
> > reg.h:1014:#define AR_PCIE_MSI_ENABLE                       
> 0x00000001
> >   
> According to ath9k developers adding MSI support to the 
> driver is not trivial.
> They've tried once, it didn't work and they gave up. Any 
> chance I can use mini-PCI-E slot without MSI ?

So, even after enabling the above bit, there were no MSI 
interrupts from this card. If we look at some of the GbE 
or SATA drivers, adding MSI is not that hard. ath9k can 
be an exception. 

I reported this issue to the p2020 board designer; but 
unfortunately he is out until 1/4/10. It could be a missing 
pull-up issue at IRQ0 or some thing else, I don't know. 

> Thanks.
> Felix.


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