Re: [PATCH #upstream-fixes] ahci: add workaround for on-board 5723s on some gigabyte boards

[Jeff Garzik <jgarzik@pobox.com>]

Tejun Heo wrote:
> Some gigabytes have on-board SIMG5723s connected to JMB ahcis.  These
> are used to implement hardware raid.  Unfortunately some firmware
> revisions on these 5723s don't bring the link down when all the
> downstream ports are unoccupied while not responding to reset protocol
> which makes libata think that there's device attached to the port but
> is not responding and retry.  This results in painfully wrong boot
> detection time for these ports when they're empty.
> 
> This patch quirks those boards such that ahci gives up after the
> initial timeout.  Combined with parallel probing, this gives quick
> enough probing and also is safe because SIMG5723 will respond to the
> first try if any of the downstream ports is occupied.
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reported-by: Marc Bowes <marcbowes@gmail.com>
> Reported-by: Nicolas Mailhot <Nicolas.Mailhot@LaPoste.net>
> ---
>  drivers/ata/ahci.c |   76 ++++++++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 72 insertions(+), 4 deletions(-)

applied