[Intel-gfx] [RFC 0/2] Add new CDCLK step for RPL-U

[Chaitanya Kumar Borah]

A new step of 480MHz has been added on SKUs that have an RPL-U
device id. This particular step is to support 120Hz panels
more efficiently.

This patchset adds a new table to include this new CDCLK
step. Details can be found in BSpec entry 55409.

Create a new sub-platform to identify RPL-U which will enable
us to make the differentiation during CDCLK initialization.

Furthermore, we need to make a distinction between ES (Engineering
Sample) and QS (Quality Sample) parts as this change comes only
to QS parts. This version of the patch does not include this change
as we are yet to make a decision if this particular part needs
to be upstreamed.(see comments on revision 2)

Chaitanya Kumar Borah (2):
  drm/i915: Add RPL-U sub platform
  drm/i915/display: Add 480 MHz CDCLK steps for RPL-U

 drivers/gpu/drm/i915/display/intel_cdclk.c | 27 ++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_drv.h            |  2 ++
 drivers/gpu/drm/i915/i915_pci.c            |  1 +
 drivers/gpu/drm/i915/intel_device_info.c   |  8 +++++++
 drivers/gpu/drm/i915/intel_device_info.h   |  2 ++
 include/drm/i915_pciids.h                  | 11 +++++----
 6 files changed, 47 insertions(+), 4 deletions(-)

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2.25.1