[Bug 96214] [BAT SKL] WARN Unclaimed register detected (0x65f10) / gem_exec_suspend at basic-s4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96214

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

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

--- Comment #24 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit d838a110f0b310d408ebe6b5a97e36ec27555ebf
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Aug 3 17:09:00 2016 +0100

    drm/i915: Acquire audio powerwell for HD-Audio registers

    On Haswell/Broadwell, the HD-Audio block is inside the HDMI/display
    power well and so the sna-hda audio codec acquires the display power
    well while it is operational. However, Skylake separates the powerwells
    again, but yet we still need the audio powerwell to setup the registers.
    (But then the hardware uses those registers even while powered off???)

    Acquiring the powerwell around setting the chicken bits when setting up
    the audio channel does at least silence the WARNs from touching our
    registers whilst unpowered. We silence our own test cases, but maybe
    there is a latent bug in using the audio channel?

    v2: Grab both rpm wakelock and audio wakelock

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96214
    Fixes: 03b135cebc47 "ALSA: hda - remove dependency on i915 power well for
SKL")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Libin Yang <libin.yang at intel.com>
    Cc: Takashi Iwai <tiwai at suse.de>
    Cc: Marius Vlad <marius.c.vlad at intel.com>
    Tested-by: Hans de Goede <hdegoede at redhat.com>
    Cc: stable at vger.kernel.org
    Link:
http://patchwork.freedesktop.org/patch/msgid/1470240540-29004-1-git-send-email-chris@chris-wilson.co.uk
    Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

will mask this bug, but please keep your ears peeled for any glitches.

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