tree b2c5b85f15e4068d29fd41d2e6e65f81dd7339d5
parent 7961acd7327fe48e55abef277630abdbb3f2081a
author Matthew Wilcox <matthew@wil.cx> 1292440691 -0500
committer Sarah Sharp <sarah.a.sharp@linux.intel.com> 1295049120 -0800

xhci: Remove more doorbell-related reads

The unused space in the doorbell is now marked as RsvdZ, not RsvdP, so
we can avoid reading the doorbell before writing it.

Update the doorbell-related defines to produce the entire doorbell value
from a single macro.  Document the doorbell format in a comment.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>