[Bug 100572] [SKL dmc] Headless mode media transcoding is 20-30% slower comparing to connected monitor use case

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100572

--- Comment #25 from Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com> ---
One of the experiments Animesh asked me to do was to look at the state of the
DC_STATE_EN register at runtime.

It looked that it had reverted to a value other than what was programmed by
i915. On top of that, it looked impossible to manually modify it at runtime.

The value it is reverting to was DC_STATE_EN_UPTO_DC6, regardless of whether
the driver has programmed DC_STATE_EN_UPTO_DC5 or DC_STATE_EN_UPTO_DC5 |
DC_STATE_EN_UPTO_DC6.

This coupled with a comment in gen9_write_dc_state makes me suspicious whether
DMC is not doing things behind the drivers back?

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