queue_reset register polarity to improve

[Parav Pandit <parav@nvidia.com>]

Hi,

A recently defined queue_reset register has a little weird definition that we should improve.
When driver initiate queue reset, it writes queue_reset = 1.
When device is busy resetting the queue, on this driver request, it is expected to return queue_reset=0.
Once queue reset is completed it is expected to return queue_reset = 1.
(Polarity changed twice to same value as what was driver set). See more below.

So state wise,
# q_enable, q_reset represents :
a) 0,0 -> device init time value
b) 1,0 -> vq is enabled and working
c) 1,1 -> vq is enabled, driver initiated reset
d) 1,0 -> vq is enabled, but device is busy doing the reset (conflicting definition with above #b )
e) 0,1 -> vq reset is complete in the device and VQ is now disabled (again conflict with #a above )

Instead, I think we should have below better, consistent definition, no matter how queue reset occurs (init time or later).

q_enable, q_reset
A) 0, 0 -> default, device init time
B) 1, 0 -> driver has enabled vq
C) 1, 1 -> driver started q reset
D) 1, 1 -> q_reset stays 1 until device is busy resetting vq (communicating that its working on resetting, consistent with #C)
E) 0, 0 -> q_reset by device is completed, q got disabled (now matches the state same as device init time #A)

Parav