git: ahci - Adjust a few things

[Matthew Dillon]

commit 0e589b85686434c5a4deb4cf3514d3e9f02df367
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Sun Dec 18 16:45:06 2016 -0800

    ahci - Adjust a few things
    
    * These changes have no effect on known AHCI devices but are a good idea.
    
    * As suggested in the AHCI spec 10.1.2, zero out the memory pointed to
      by the FB and CL port dma addresses.
    
    * Write to FB before FBU, and to CLB before CLBU, just in case hardware
      clears the upper bits on a write to the lower bits (no known AHCI
      hardware does this but its something that is commonly implemented in
      other hw so...).
    
    * Improved I/O error reporting.

Summary of changes:
 sys/dev/disk/ahci/ahci.c        | 10 +++++++---
 sys/dev/disk/ahci/ahci.h        |  3 +++
 sys/dev/disk/ahci/ahci_attach.c | 14 +++++++++-----
 sys/dev/disk/ahci/ahci_cam.c    | 17 ++++++++++++++---
 sys/dev/disk/ahci/atascsi.h     |  1 +
 5 files changed, 34 insertions(+), 11 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/0e589b85686434c5a4deb4cf3514d3e9f02df367


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