git: kernel - AHCI hotplug work to help support AMD chipsets
commit 5502cf2442bc10db6925a4db0956131ae634ec95
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Mon Nov 22 18:25:33 2010 -0800
kernel - AHCI hotplug work to help support AMD chipsets
* Change the Hot-plug mechanics to something which appears to work for
both NVidia and AMD AHCI chipsets, and hopefully Intel too (untested).
This appears to fix hot-plug for AMD's SB850-based AHCI (circa AM3 socket
mobos).
* Basically the SCTL.DET and CMD.SUD bits control the behavior of the
SATA Phy, but in typical Intel fashion the specification is seriously
lacking on how events such as hot-plug are handled based on what state
the phy is in.
Previously we were looking for phy transition events while holding
the port in the RESET state (DET=1, SUD=1), which worked up till this
point. But it doesn't work with AMD's SB850-based AHCI.
Now we are attempting to do the same thing with the port in
the SPIN-UP/NORMAL state (DET=0, SUD=1).
* The AHCI documentation wants us to use the LISTEN mode (DET=0, SUD=0)
and get a SERR.DIAG.X event for hot-plug but this doesn't seem to work
very reliably. In fact, 10.10.4 is ambiguous for the case
where Staggered-spin-up is not supported since SUD is wired to '1'
in that case (making LISTEN mode impossible).
Summary of changes:
sys/dev/disk/ahci/ahci.c | 96 ++++++++++++++++++++++++++--------------------
1 files changed, 54 insertions(+), 42 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/5502cf2442bc10db6925a4db0956131ae634ec95
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DragonFly BSD source repository
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