[PATCH RFC v2 0/8] drm/bridge: dw-hdmi: implement bus-format negotiation and YUV420 support

[Neil Armstrong]

This patchset is based on Boris's v2 "drm: Add support for bus-format negotiation" at [1]
patchset to implement full bus-format negotiation for DW-HDMI, including YUV420 support and
10/12/16bit YUV444, YUV422 and RGB. The Color Space Converter support is already implemented.

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]

Changes since RFC v1 at [4]:
- Rewrote negociation using the v2 patchset, including full DW-HDMI fmt negociation

[1] https://patchwork.freedesktop.org/patch/msgid/20190826152649.13820-1-boris.brezillon@xxxxxxxxxxxxx
[2] https://patchwork.freedesktop.org/patch/msgid/20190520133753.23871-1-narmstrong@xxxxxxxxxxxx
[3] https://patchwork.freedesktop.org/patch/msgid/1549022873-40549-1-git-send-email-narmstrong@xxxxxxxxxxxx
[4] https://patchwork.freedesktop.org/patch/msgid/20190820084109.24616-1-narmstrong@xxxxxxxxxxxx

Neil Armstrong (8):
  drm/meson: venc: make drm_display_mode const
  drm/meson: meson_dw_hdmi: switch to drm_bridge_funcs
  drm/bridge: synopsys: dw-hdmi: add bus format negociation
  drm/meson: dw-hdmi: stop enforcing input_bus_format
  drm/bridge: dw-hdmi: allow ycbcr420 modes for >= 0x200a
  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 | 251 +++++++++++++++++++++-
 drivers/gpu/drm/meson/meson_dw_hdmi.c     | 164 +++++++++++---
 drivers/gpu/drm/meson/meson_vclk.c        |  93 ++++++--
 drivers/gpu/drm/meson/meson_vclk.h        |   7 +-
 drivers/gpu/drm/meson/meson_venc.c        |  10 +-
 drivers/gpu/drm/meson/meson_venc.h        |   4 +-
 drivers/gpu/drm/meson/meson_venc_cvbs.c   |   3 +-
 include/drm/bridge/dw_hdmi.h              |   1 +
 8 files changed, 466 insertions(+), 67 deletions(-)

-- 
2.22.0