[PATCH v13 0/3] drm/mediatek: Add support for OF graphs

[Chun-Kuang Hu]

Hi, Angelo:

For patch [1/3] and patch [3/3], applied to mediatek-drm-next [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang.

AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com> 於
2024年10月17日 週四 下午6:38寫道：
>
> Changes in v13:
>  - Added comment in commit description of patch [1/3] to warn about
>    new port scheme.
>  - The series is now fully reviewed, tested, hence *ready*.
>
> Changes in v12:
>  - Added comment to describe graph for OVL_ADAPTOR in patch [3/3]
>    as suggested by CK Hu.
>
> Changes in v11:
>  - Added OVL_ADAPTOR_MDP_RDMA to OVL Adaptor exclusive components list
>    to avoid failures in graphs with MDP_RDMA inside
>  - Rebased on next-20241004
>
> Changes in v10:
>  - Removed erroneously added *.orig/*.rej files
>
> Changes in v9:
>  - Rebased on next-20240910
>  - Removed redundant assignment and changed a print to dev_err()
>  - Dropped if branch to switch conversion as requested; this will
>    be sent as a separate commit out of this series.
>
> Changes in v8:
>  - Rebased on next-20240617
>  - Changed to allow probing a VDO with no available display outputs
>
> Changes in v7:
>  - Fix typo in patch 3/3
>
> Changes in v6:
>  - Added EPROBE_DEFER check to fix dsi/dpi false positive DT fallback case
>  - Dropped refcount of ep_out in mtk_drm_of_get_ddp_ep_cid()
>  - Fixed double refcount drop during path building
>  - Removed failure upon finding a DT-disabled path as requested
>  - Tested again on MT8195, MT8395 boards
>
> Changes in v5:
>  - Fixed commit [2/3], changed allOf -> anyOf to get the
>    intended allowance in the binding
>
> Changes in v4:
>  - Fixed a typo that caused pure OF graphs pipelines multiple
>    concurrent outputs to not get correctly parsed (port->id);
>  - Added OVL_ADAPTOR support for OF graph specified pipelines;
>  - Now tested with fully OF Graph specified pipelines on MT8195
>    Chromebooks and MT8395 boards;
>  - Rebased on next-20240516
>
> Changes in v3:
>  - Rebased on next-20240502 because of renames in mediatek-drm
>
> Changes in v2:
>  - Fixed wrong `required` block indentation in commit [2/3]
>
>
> The display IPs in MediaTek SoCs are *VERY* flexible and those support
> being interconnected with different instances of DDP IPs (for example,
> merge0 or merge1) and/or with different DDP IPs (for example, rdma can
> be connected with either color, dpi, dsi, merge, etc), forming a full
> Display Data Path that ends with an actual display.
>
> This series was born because of an issue that I've found while enabling
> support for MT8195/MT8395 boards with DSI output as main display: the
> current mtk_drm_route variations would not work as currently, the driver
> hardcodes a display path for Chromebooks, which have a DisplayPort panel
> with DSC support, instead of a DSI panel without DSC support.
>
> There are other reasons for which I wrote this series, and I find that
> hardcoding those paths - when a HW path is clearly board-specific - is
> highly suboptimal. Also, let's not forget about keeping this driver from
> becoming a huge list of paths for each combination of SoC->board->disp
> and... this and that.
>
> For more information, please look at the commit description for each of
> the commits included in this series.
>
> This series is essential to enable support for the MT8195/MT8395 EVK,
> Kontron i1200, Radxa NIO-12L and, mainly, for non-Chromebook boards
> and Chromebooks to co-exist without conflicts.
>
> Besides, this is also a valid option for MT8188 Chromebooks which might
> have different DSI-or-eDP displays depending on the model (as far as I
> can see from the mtk_drm_route attempt for this SoC that is already
> present in this driver).
>
> This series was tested on MT8195 Cherry Tomato and on MT8395 Radxa
> NIO-12L with both hardcoded paths, OF graph support and partially
> hardcoded paths, and pure OF graph support including pipelines that
> require OVL_ADAPTOR support.
>
> AngeloGioacchino Del Regno (3):
>   dt-bindings: display: mediatek: Add OF graph support for board path
>   dt-bindings: arm: mediatek: mmsys: Add OF graph support for board path
>   drm/mediatek: Implement OF graphs support for display paths
>
>  .../bindings/arm/mediatek/mediatek,mmsys.yaml |  28 ++
>  .../display/mediatek/mediatek,aal.yaml        |  40 +++
>  .../display/mediatek/mediatek,ccorr.yaml      |  21 ++
>  .../display/mediatek/mediatek,color.yaml      |  22 ++
>  .../display/mediatek/mediatek,dither.yaml     |  22 ++
>  .../display/mediatek/mediatek,dpi.yaml        |  25 +-
>  .../display/mediatek/mediatek,dsc.yaml        |  24 ++
>  .../display/mediatek/mediatek,dsi.yaml        |  27 +-
>  .../display/mediatek/mediatek,ethdr.yaml      |  22 ++
>  .../display/mediatek/mediatek,gamma.yaml      |  19 ++
>  .../display/mediatek/mediatek,merge.yaml      |  23 ++
>  .../display/mediatek/mediatek,od.yaml         |  22 ++
>  .../display/mediatek/mediatek,ovl-2l.yaml     |  22 ++
>  .../display/mediatek/mediatek,ovl.yaml        |  22 ++
>  .../display/mediatek/mediatek,postmask.yaml   |  21 ++
>  .../display/mediatek/mediatek,rdma.yaml       |  22 ++
>  .../display/mediatek/mediatek,ufoe.yaml       |  21 ++
>  drivers/gpu/drm/mediatek/mtk_disp_drv.h       |   1 +
>  .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c   |  43 ++-
>  drivers/gpu/drm/mediatek/mtk_dpi.c            |  21 +-
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c        | 253 +++++++++++++++++-
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h        |   2 +-
>  drivers/gpu/drm/mediatek/mtk_dsi.c            |  14 +-
>  23 files changed, 712 insertions(+), 25 deletions(-)
>
> --
> 2.46.1
>