[Intel-gfx] [PATCH 4/8] drm/i915/gen9: fix the WaWmMemoryReadLatency implementation

[Maarten Lankhorst]

Op 07-09-16 om 02:52 schreef Paulo Zanoni:
> Bspec says:
>   "The mailbox response data may not account for memory read latency.
>    If the mailbox response data for level 0 is 0us, add 2 microseconds
>    to the result for each valid level."
>
> This means we should only do the +2 in case wm[0] == 0, not always.
>
> So split the sanitizing implementation from the WA implementation and
> fix the WA implementation.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
This one probably needs a dim fixes $commit, just like patch 6 and 7.

For the rest the changes look sane, so with the review comments in the other patches addressed:
Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>