[RFC 00/11] drm/bridge: dw-hdmi: implement bus-format negotiation and YUV420 support

[Neil Armstrong]

This patchset is based on Boris's "drm: Add support for bus-format negotiation" RFC at [1]
patchset to implement :
- basic bus-format negotiation for DW-HDMI
- advanced HDMI2.0 YUV420 bus-format negotiation for DW-HDMI

And the counterpart implementation in the Amlogic Meson VPU dw-hdmi glue :
- basic bus-format negotiation to select YUV444 bus-format as DW-HDMI input
- YUV420 support when HDMI2.0 YUV420 modeset

This is a follow-up from the previous attempts :
- "drm/meson: Add support for HDMI2.0 YUV420 4k60" at [2]
- "drm/meson: Add support for HDMI2.0 4k60" at [3]

[1] https://patchwork.freedesktop.org/patch/msgid/20190808151150.16336-1-boris.brezillon@collabora.com
[2] https://patchwork.freedesktop.org/patch/msgid/20190520133753.23871-1-narmstrong@baylibre.com
[3] https://patchwork.freedesktop.org/patch/msgid/1549022873-40549-1-git-send-email-narmstrong@baylibre.com

Neil Armstrong (11):
  fixup! drm/bridge: Add the necessary bits to support bus format
    negotiation
  drm/meson: venc: make drm_display_mode const
  drm/meson: meson_dw_hdmi: switch to drm_bridge_funcs
  drm/bridge: synopsys: dw-hdmi: add basic bridge_atomic_check
  drm/bridge: synopsys: dw-hdmi: use negociated bus formats
  drm/meson: dw-hdmi: stop enforcing input_bus_format
  drm/bridge: dw-hdmi: allow ycbcr420 modes for >= 0x200a
  drm/bridge: synopsys: dw-hdmi: add 420 mode format negociation
  drm/meson: venc: add support for YUV420 setup
  drm/meson: vclk: add support for YUV420 setup
  drm/meson: Add YUV420 output support

 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c |  97 +++++++++++++++-
 drivers/gpu/drm/drm_bridge.c              |   6 +-
 drivers/gpu/drm/meson/meson_dw_hdmi.c     | 135 +++++++++++++++++-----
 drivers/gpu/drm/meson/meson_vclk.c        |  93 +++++++++++----
 drivers/gpu/drm/meson/meson_vclk.h        |   7 +-
 drivers/gpu/drm/meson/meson_venc.c        |   8 +-
 drivers/gpu/drm/meson/meson_venc.h        |  13 ++-
 drivers/gpu/drm/meson/meson_venc_cvbs.c   |   3 +-
 include/drm/bridge/dw_hdmi.h              |   1 +
 9 files changed, 295 insertions(+), 68 deletions(-)

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2.22.0