Some display controllers can be programmed to present non-black colors for pixels not covered by any plane (or pixels covered by the transparent regions of higher planes). Compositors that want a UI with a solid color background can potentially save memory bandwidth by setting the CRTC background property and using smaller planes to display the rest of the content.
Earlier versions of these patches were floated on dri-devel about 2.5 years ago, but at that time the only userspace software that made use of this was closed-source (product-specific Wayland compositors), so we never landed the patches upstream. I'm told that there's now some renewed interest in this functionality from both the ChromeOS camp and the Weston camp, so I'm re-posting updated kernel patches here to get the ball rolling again. As always, we'll still need the patches for at least one of those projects to get posted (and reviewed) somewhere public before we actually merge these kernel patches. Cc: dri-devel@lists.freedesktop.org Cc: wei.c...@intel.com Cc: harish.krupo....@intel.com Matt Roper (2): drm: Add CRTC background color property drm/i915/gen9+: Add support for pipe background color drivers/gpu/drm/drm_atomic_state_helper.c | 1 + drivers/gpu/drm/drm_atomic_uapi.c | 5 +++++ 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 | 34 +++++++++++++++++++++++++++++++ include/drm/drm_crtc.h | 17 ++++++++++++++++ include/drm/drm_mode_config.h | 5 +++++ include/uapi/drm/drm_mode.h | 26 +++++++++++++++++++++++ 9 files changed, 109 insertions(+) -- 2.14.4 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
