Fourth version of the series previously posted here: https://lists.freedesktop.org/archives/intel-gfx/2018-November/181939.html
Code-wise, this version mainly just drops the bgcolor_changed flag. Most of the changes here are just to the kerneldoc: clarifying the interaction of background color with crtc degamma/csc/gamma, and why having a non-opaque background color might actually make sense for very specific use cases (memory writeback connectors).
As before, the first patch in this series is just an Intel-specific bugfix that is unrelated to the ABI change and thus can be merged immediately after review. The second and third patches need a pointer to the ready, reviewed userspace that's going to use this (I believe ChromeOS pretty much has this ready, but I don't have a link to their patches yet). I heard there's also someone working on adding support for this to Weston, but I'm not sure what the status of that work is.
Matt Roper (3): drm/i915: Force background color to black for gen9+ (v2) drm: Add CRTC background color property (v4) drm/i915/gen9+: Add support for pipe background color (v4)
drivers/gpu/drm/drm_atomic_uapi.c | 4 ++++ drivers/gpu/drm/drm_blend.c | 28 ++++++++++++++++++++++--- drivers/gpu/drm/drm_mode_config.c | 6 ++++++ drivers/gpu/drm/i915/i915_debugfs.c | 9 ++++++++ drivers/gpu/drm/i915/i915_reg.h | 6 ++++++ drivers/gpu/drm/i915/intel_display.c | 40 ++++++++++++++++++++++++++++++++++++ include/drm/drm_blend.h | 1 + include/drm/drm_crtc.h | 12 +++++++++++ include/drm/drm_mode_config.h | 5 +++++ include/uapi/drm/drm_mode.h | 28 +++++++++++++++++++++++++ 10 files changed, 136 insertions(+), 3 deletions(-)