Re: [PATCH #upstream-fixes] ahci: sis controllers actually can do PMP

[Jeff Garzik <jeff@garzik.org>]

Tejun Heo wrote:
> SIS controllers were blacklisted for PMP as enabling it made device
> detection fail whether the device was PMP or not - the natural
> conclusion was the controller chokes on SRST w/ pmp==15.  However, it
> turned out that the controller just didn't like issuing SRST after
> hardreset w/o clearing SError first.  Interestingly, the SRST itself
> succeeds but the following commands fail.
> 
> If SError is cleared between hardreset and SRST, which is the default
> behavior now, everything works fine and SIS controllers work with PMPs
> happily.
> 
> Remove PMP blacklisting for SIS AHCIs.
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: Piter PUNK <piterpunk@slackware.com>
> ---
>  drivers/ata/ahci.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

applied