Re: PATCH: Simplex and other mode filtering logic

[Jeff Garzik]

Alan Cox wrote:
> Add a field to the host_set called 'flags' (was host_set_flags changed
> to suit Jeff)
> Add a simplex_claimed field so we can remember who owns the DMA channel
> Add a ->mode_filter() hook to allow drivers to filter modes
> Add docs for mode_filter and set_mode
> Filter according to simplex state
> Filter cable in core
>
> This provides the needed framework to support all the mode rules found
> in the PATA world. The simplex filter deals with 'to spec' simplex DMA
> systems found in older chips. The cable filter avoids duplicating the
> same rules in each chip driver with PATA. Finally the mode filter is
> neccessary because drive/chip combinations have errata that forbid
> certain modes with some drives or types of ATA object.
>
> Drive speed setup remains per channel for now and the filters now use
> the framework Tejun put into place which cleans them up a lot from the
> older libata-pata patches.
>
> Signed-off-by: Alan Cox <alan@xxxxxxxxxx>

applied


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