Re: [PATCH] ahci: Add support for Promise PDC42819

[Jeff Garzik <jeff@garzik.org>]

Mark Nelson wrote:
> Add an appropriate entry for the Promise PDC42819 controller. It has an
> AHCI mode and so far works correctly with board_ahci.
> 
> This chip is found on Promise's FastTrak TX2650 (2 port) and TX4650 (4 port)
> software-based RAID cards (for which there is a binary driver, t3sas) and
> can be found on some motherboards, for example the MSI K9A2 Platinum,
> which calls the chip a Promise T3 controller.
> 
> Although this controller also supports SAS devices, its default bootup mode
> is AHCI and the binary driver has to do some magic to get the chip into the
> appropriate mode to drive SAS disks.
> 
> Seeing as no documentation is provided by Promise, adding this entry to the
> ahci driver allows the controller to be useful to people as a SATA
> controller (with no ill effects on the system if a SAS disk is connected -
> probing of the port just times out with "link online but device
> misclassified"), without having to resort to using the binary driver. Users
> who require SAS or the proprietary software raid can get this functionality
> using the binary driver.
> 
> Signed-off-by: Mark Nelson <mdnelson8@gmail.com>
> ---
>  drivers/ata/ahci.c |    3 +++
>  1 file changed, 3 insertions(+)

applied