HDMI 2.0 spec defines a method to reduce the RF footprint while operating at higher pixel clocks, which is called Scrambling. Scrambling can be controlled over a new set of I2C registers which are accessible over existing DDC I2C lines, called SCDC register set.
This patch series contains 6 patches: - First two patches add generic drm helper functions to read and write into SCDC registers. These patches are written by Thierry, in a patch series published here: https://patchwork.kernel.org/patch/9459051/ Minor changes were done to map the patches into this series. - Next two patches add functions for scrambling detection and scrambling control. - Next two patches use this infrastructure in DRM layer from I915 driver, to enable scrambling on a GLK deivce which sports a native HDMI 2.0 controller.
Shashank Sharma (4): drm/edid: detect SCDC support in HF-VSDB drm: scrambling support in drm layer drm/i915: enable scrambling drm/i915: allow HDMI 2.0 clock rates
Thierry Reding (2): drm: Add SCDC helpers drm/edid: check for HF-VSDB block
Documentation/gpu/drm-kms-helpers.rst | 12 +++ drivers/gpu/drm/Makefile | 3 +- drivers/gpu/drm/drm_edid.c | 158 ++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_scdc_helper.c | 111 ++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_reg.h | 2 + drivers/gpu/drm/i915/intel_ddi.c | 5 ++ drivers/gpu/drm/i915/intel_drv.h | 2 + drivers/gpu/drm/i915/intel_hdmi.c | 44 ++++++++++ include/drm/drm_connector.h | 50 +++++++++++ include/drm/drm_edid.h | 6 +- include/drm/drm_scdc_helper.h | 132 ++++++++++++++++++++++++++++ include/linux/hdmi.h | 1 + 12 files changed, 524 insertions(+), 2 deletions(-) create mode 100644 drivers/gpu/drm/drm_scdc_helper.c create mode 100644 include/drm/drm_scdc_helper.h