[Bug 67600] [IVB/HSW] gen7_queue_flip doesn't work on RCS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67600

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #16 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit ffe74d75502e3a9b0791240b5562bcbecc6ab8dc
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Aug 26 20:58:12 2013 +0100

    drm/i915: Use RCS flips on Ivybridge+

    RCS flips do work on Iybridge+ so long as we can unmask the messages
    through DERRMR. However, there are quite a few workarounds mentioned
    regarding unmasking more than one event or triggering more than one
    message through DERRMR. Those workarounds in principle prevent us from
    performing pipelined flips (and asynchronous flips across multiple
    planes) and equally apply to the "known good" BCS ring. Given that it
    already appears to work, and also appears to work with unmasking all 3
    planes at once (and queuing flips across multiple planes), be brave.

    Bugzlla: https://bugs.freedesktop.org/show_bug.cgi?id=67600
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Lightly-tested-by: Stephane Marchesin <marchesin at icps.u-strasbg.fr>
    Cc: Stephane Marchesin <marchesin at icps.u-strasbg.fr>
    Cc: Ben Widawsky <ben at bwidawsk.net>
    Tested-by: Stéphane Marchesin <marcheu at chromium.org>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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