[Intel-gfx] [PATCH 0/3] Enable PSR by default in certain platforms

[Rodrigo Vivi]

For a long time we are trying to enable PSR by default everwhere
but we always end up in soem specific corner case in one
platform or another and end up not enabling in older stable platforms
that could benefit from the power saving it provides.

So, let's change the approach here and try to enable it separated.

The new blocking issue is for Skylake and Kabylake due to a vblank
wait situation with DMC firmware:
https://bugs.freedesktop.org/show_bug.cgi?id=94126
So that case will block PSR on SKL and KBL.

But  this doesn't affect at all other platforms that don't have DMC.

Also I decided to split the rest of platforms in two groups since
Valleyview/Cherryview has a complete different Hardware PSR
implementation than the rest of the platorms. Also it uses only
link standby what should be safier.

So, 1 patch to add the possibility of enable per platform, 1 patch for
VLV/CHV and 1 patch for HSW/BDW.

I hope to get SKL/KBL ready soon.

Thanks,
Rodrigo.

Rodrigo Vivi (3):
  drm/i915: Change i915.enable_psr parameter to use per platform
    default.
  drm/i915: Enable PSR by default on Valleyview and Cherryview.
  drm/i915: Enable PSR by default on Haswell and Broadwell.

 drivers/gpu/drm/i915/i915_params.c | 5 +++--
 drivers/gpu/drm/i915/intel_psr.c   | 9 +++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

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2.4.3