[Intel-gfx] [RFC 0/3] Add Colorspace connector property interface

[Uma Shankar]

This patch series creates a new connector property to program
colorspace to sink devices. Modern sink devices support more
than 1 type of colorspace like 601, 709, BT2020 etc. This helps
to switch based on content type which is to be displayed. The
decision lies with compositors as to in which scenarios, a
particular colorspace will be picked.

This will be helpful mostly to switch to higher gamut colorspaces
like BT2020 when the media content is encoded as BT2020. Thereby
giving a good visual experience to users.

The expectation from userspace is that it should parse the EDID
and get supported colorspaces. Use this property and switch to the
one supported. Kernel will not give the supported colorspaces since
this is panel dependant and our curremt property infrastructure is
not supporting it. 

Have tested this using xrandr by using below command:
xrandr --output HDMI2 --set "Colorspace" "BT2020_rgb"

Please provide comments on this current approach. This is just an RFC
to get some feedback. Will refine the series based on inputs and
feedback.

Uma Shankar (3):
  drm: Add colorspace property
  drm/i915: Attach colorspace property and enable modeset
  drm/i915: Set colorspace by enabling Infoframe

 drivers/gpu/drm/drm_atomic.c        |  4 ++++
 drivers/gpu/drm/drm_connector.c     | 31 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_atomic.c |  1 +
 drivers/gpu/drm/i915/intel_hdmi.c   |  5 +++++
 include/drm/drm_connector.h         |  7 +++++++
 include/drm/drm_mode_config.h       |  6 ++++++
 include/uapi/drm/drm_mode.h         | 11 +++++++++++
 7 files changed, 65 insertions(+)

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1.9.1