Re: [PATCH 3/4] AHCI: Conserve interrupts withpci_enable_msi_block_part() interface

From: Tejun Heo
Date: Tue Sep 03 2013 - 14:27:47 EST


Hello,

On Tue, Sep 03, 2013 at 06:19:06PM +0200, Alexander Gordeev wrote:
> We must enable maximum possible number of MSIs - the one reported in
> Multiple Message Capable register. Otherwise ICH device will fallback
> to MRSM. IOW, if the result of roundup_pow_of_two(n_ports) is not what
> in Multiple Message Capable register (i.e. as roundup_pow_of_two(6) vs 16)
> ICH will enforce MRSM mode.

Hmmm... I think the interface in general is pretty messy. Wouldn't it
be much cleaner to have a separate function to query MSICAP and let
the function just return success / failure?

Thanks.

--
tejun
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