[Bug 97929] [SKL] igt/kms_pipe_crc_basic: [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk change

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97929

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 features|                            |display/Other, power/Other
            Summary|]SKL igt/kms_pipe_crc_basic |[SKL]
                   |                            |igt/kms_pipe_crc_basic:
                   |                            |[drm:skl_set_cdclk] *ERROR*
                   |                            |failed to inform PCU about
                   |                            |cdclk change

--- Comment #1 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
kms_pipe_crc_basic occasionally hits "[drm:skl_set_cdclk] *ERROR* failed to
inform PCU about cdclk change" on fi-skl-6700hq

My last attempt at fixing these wasn't entirely succesful perhaps:
commit 848496e5902833600f7992f4faa82dc1546051ba
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Wed Jul 13 16:32:03 2016 +0300

    drm/i915: Wait up to 3ms for the pcu to ack the cdclk change request on SKL

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