[PATCH v4 0/2] drm/i915/display: reduce clock_gating interface between core and display

[Luca Coelho <luciano.coelho@intel.com>]

Hi,

This is v4 of the series to reduce the clock gating interface between
the display code and core i915.  The first three patches received
Reviewed-by tags and have already been merged, so this version contains
only the two remaining patches.

Sashiko pointed out that the original patch 4/5 dropped the HSW/BDW
GT/uncore clock gating workarounds when replacing the call to
intel_clock_gating_init() on PC8+ exit.  Fix this by restoring the
display/PCH registers directly in display code and restoring the
GT/uncore workarounds through the display parent interface.

Only the former patch 4/5 has been modified.  The former patch 5/5 is
unchanged apart from rebasing.

Previous versions:
https://patchwork.freedesktop.org/series/169493/

In v2:

  * Reworked the previous version so we have only one entry point,
    instead of an _early() and a _late() function.  It turns out that
    this is not necessary because some platforms were using only
    _early() and the others were using _late() (not both);
    
  * Removed back-dependency from the display code into the core code
    by avoiding calls to intel_clock_gating_init() (Jani);

In v3:

  * Added intel_display_clock_gating.o to xe's Makefile to prevent
    linking breakage;

In v4:

  * Drop the three patches already merged.
  * Preserve HSW/BDW GT/uncore clock gating workarounds on PC8+ exit
    through the display parent interface (Sashiko).

Please review.

Cheers,
Luca.


Luca Coelho (2):
  drm/i915/display: add a way to restore only display/pch registers in
    clock_gating
  drm/i915/display: split part of intel_display_reset_finish() to a new
    function

 .../i915/display/intel_display_clock_gating.c |  7 ++++
 .../i915/display/intel_display_clock_gating.h |  1 +
 .../drm/i915/display/intel_display_power.c    |  7 +++-
 .../drm/i915/display/intel_display_reset.c    | 19 +++++++---
 .../drm/i915/display/intel_display_reset.h    |  1 +
 drivers/gpu/drm/i915/display/intel_parent.c   |  9 +++++
 drivers/gpu/drm/i915/display/intel_parent.h   |  3 ++
 drivers/gpu/drm/i915/gt/intel_reset.c         |  5 +++
 drivers/gpu/drm/i915/i915_driver.c            |  1 +
 drivers/gpu/drm/i915/intel_clock_gating.c     | 37 ++++++++++++++++---
 drivers/gpu/drm/i915/intel_clock_gating.h     |  2 +
 drivers/gpu/drm/xe/Makefile                   |  1 +
 include/drm/intel/display_parent_interface.h  |  7 ++++
 13 files changed, 86 insertions(+), 14 deletions(-)

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2.53.0