[Intel-gfx] [PATCH v2 00/12] Minor revid/stepping and workaround cleanup

[Matt Roper]

PCI revision IDs don't always map to GT and display IP steppings in an
intuitive/sensible way.  On many of our recent platforms we've switched
to using revid->stepping lookup tables with the infrastructure in
intel_step.c to handle stepping lookups and comparisons.  This series
converts several of our older platforms over to the same table-based
scheme; this is good not only for consistency, but also because some
upcoming DMC work will rely on table-based lookups.  Going forward the
only place that revision ID's should really get used directly is when
checking to see if we're running on pre-production hardware.

Note:  I haven't added the stepping tables for CFL and its derivatives
(WHL, AML) yet since there are so many different variants and the
steppings work a bit strangely on some of them.  We don't have any
stepping-specific workarounds on these platforms, so the tables aren't
necessary until Anusha's DMC work arrives; I'll let her determine the
best way to handle the tables for those.  Ditto for CML.

Let's also take the opportunity to drop a bit of effectively dead code
in the workarounds file too.

v2:
 - Include an already-reviewed patch from Anusha's DMC series as the
   first patch here that changes the naming of the revision ID tables,
   and then adjust the naming of the new tables I add here to follow the
   same convention.
 - Drop the pre-production revisions for all gen11 and earlier
   platforms; we're past the point where we usually drop the
   pre-production support.  intel_detect_preproduction_hw() is updated
   with the proper revids for ICL to ensure we print an error and taint
   the kernel if the kernel is loaded on a pre-production platform.
 - ICL workarounds that only apply to pre-production steppings are
   dropped.
 - For platforms where GT stepping is always the same as display
   stepping, we use a macro to assign them both at once to make it more
   obvious how the platform works.
 - Stepping tables for BXT and GLK are added.  They're completely unused
   in our current code (we have no stepping-specific workarounds), but
   some DMC patches from Anusha will arrive shortly that require these.
   Note that the BXT revision macros we had previously were completely
   wrong; it's a good thing they weren't actually being used for
   anything.

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>

Anusha Srivatsa (1):
  drm/i915/step: s/<platform>_revid_tbl/<platform>_revids

Matt Roper (11):
  drm/i915: Make pre-production detection use direct revid comparison
  drm/i915/skl: Use revid->stepping tables
  drm/i915/kbl: Drop pre-production revision from stepping table
  drm/i915/bxt: Use revid->stepping tables
  drm/i915/glk: Use revid->stepping tables
  drm/i915/icl: Use revid->stepping tables
  drm/i915/jsl_ehl: Use revid->stepping tables
  drm/i915/rkl: Use revid->stepping tables
  drm/i915/dg1: Use revid->stepping tables
  drm/i915/cnl: Drop all workarounds
  drm/i915/icl: Drop workarounds that only apply to pre-production
    steppings

 .../drm/i915/display/intel_display_power.c    |   2 +-
 drivers/gpu/drm/i915/display/intel_dpll_mgr.c |   2 +-
 drivers/gpu/drm/i915/display/intel_psr.c      |   4 +-
 drivers/gpu/drm/i915/gt/intel_region_lmem.c   |   2 +-
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 108 ++----------------
 drivers/gpu/drm/i915/i915_drv.c               |   9 +-
 drivers/gpu/drm/i915/i915_drv.h               |  79 ++-----------
 drivers/gpu/drm/i915/intel_pm.c               |   2 +-
 drivers/gpu/drm/i915/intel_step.c             | 104 ++++++++++++++---
 drivers/gpu/drm/i915/intel_step.h             |   4 +
 10 files changed, 119 insertions(+), 197 deletions(-)

-- 
2.25.4