Re: [PATCH v10 00/21] drm/mediatek: Add mt8195 DisplayPort driver

[Rex-BC Chen <rex-bc.chen@mediatek.com>]

On Mon, 2022-05-23 at 12:47 +0200, Guillaume Ranquet wrote:
> this series is built around the DisplayPort driver. The dpi/dpintf
> driver and the added helper functions are required for the
> DisplayPort
> driver to work.
> 
> This v10 still has some un-answered comments and TODOs for v11.
> 
> This has been tested sucessfully on a 5.18-next based "vendor
> branch".
> 
> There's a missing dependency in the mediatek clock framework to allow
> a
> mux clock to change it's parent automatically on rate change.
> Without this change, the dpi driver won't properly set the clocks on
> mode change and thus nothing will be displayed on screen.
> 
> Changes from v9:
> - The DP-Phy is back to being a child device of the DP driver (as in
> v8)
> - hot plug detection has been added back to Embedded Display Port...
> as
>   after discussing with mediatek experts, this is needed eventhough
> the
>   Embedded Display port is not un-pluggable
> - rebased on linux-next
> - simplified/split train_handler function, as suggested by Rex
> - added comments on the sleep/delays present in the code
> - removed previous patch introducing retries when receiving AUX_DEFER
> as
>   this is already handled in the dp_aux framework
> - added max-lane and max-linkrate device tree u8 properties instead
> of
>   hardcoded #defines
> 
> Things that are in my todolist for v11:
> - retrieve CK/DE support from panel driver instead of hardcoding it
> into
>   the dpi driver
> - refcount the dp driver "enabled" status for "future proofing"
> - review the drm_dp_helpers for features/functions that have been
>   re-implemented in the mediatek dp drivers
> 
> Older revisions:
> RFC - 
> https://lore.kernel.org/linux-mediatek/20210816192523.1739365-1-msp@baylibre.com/
> v1  - 
> https://lore.kernel.org/linux-mediatek/20210906193529.718845-1-msp@baylibre.com/
> v2  - 
> https://lore.kernel.org/linux-mediatek/20210920084424.231825-1-msp@baylibre.com/
> v3  - 
> https://lore.kernel.org/linux-mediatek/20211001094443.2770169-1-msp@baylibre.com/
> v4  - 
> https://lore.kernel.org/linux-mediatek/20211011094624.3416029-1-msp@baylibre.com/
> v5  - 
> https://lore.kernel.org/all/20211021092707.3562523-1-msp@baylibre.com/
> v6  - 
> https://lore.kernel.org/linux-mediatek/20211110130623.20553-1-granquet@baylibre.com/
> v7  - 
> https://lore.kernel.org/linux-mediatek/20211217150854.2081-1-granquet@baylibre.com/
> v8  - 
> https://lore.kernel.org/linux-mediatek/20220218145437.18563-1-granquet@baylibre.com/
> v9  - 
> https://lore.kernel.org/all/20220327223927.20848-1-granquet@baylibre.com/
> 
> Functional dependencies are:
> - Add Mediatek Soc DRM (vdosys0) support for mt8195
>   
> https://lore.kernel.org/linux-mediatek/20220419094143.9561-2-jason-jh.lin@mediatek.com/
> - Add MediaTek SoC DRM (vdosys1) support for mt8195
>   
> https://lore.kernel.org/linux-mediatek/20220512053128.31415-1-nancy.lin@mediatek.com/
> 
> 
> Guillaume Ranquet (15):
>   drm/edid: Convert cea_sad helper struct to kernelDoc
>   drm/edid: Add cea_sad helpers for freq/length
>   drm/mediatek: dpi: move dpi limits to SoC config
>   drm/mediatek: dpi: implement a CK/DE pol toggle in SoC config
>   drm/mediatek: dpi: implement a swap_input toggle in SoC config
>   drm/mediatek: dpi: move dimension mask to SoC config
>   drm/mediatek: dpi: move hvsize_mask to SoC config
>   drm/mediatek: dpi: move swap_shift to SoC config
>   drm/mediatek: dpi: move the yuv422_en_bit to SoC config
>   drm/mediatek: dpi: move the csc_enable bit to SoC config
>   drm/mediatek: dpi: Add dpintf support
>   drm/mediatek: dpi: Only enable dpi after the bridge is enabled
>   drm/meditek: dpi: Add matrix_sel helper
>   drm/mediatek: Add mt8195 External DisplayPort support
>   drm/mediatek: DP audio support for mt8195
> 
> Jitao Shi (1):
>   drm/mediatek: add hpd debounce
> 
> Markus Schneider-Pargmann (5):
>   dt-bindings: mediatek,dpi: Add DPINTF compatible
>   dt-bindings: mediatek,dp: Add Display Port binding
>   video/hdmi: Add audio_infoframe packing for DP
>   phy: phy-mtk-dp: Add driver for DP phy
>   drm/mediatek: Add mt8195 Embedded DisplayPort driver
> 
>  .../display/mediatek/mediatek,dp.yaml         |   99 +
>  .../display/mediatek/mediatek,dpi.yaml        |   13 +-
>  MAINTAINERS                                   |    1 +
>  drivers/gpu/drm/drm_edid.c                    |   74 +
>  drivers/gpu/drm/mediatek/Kconfig              |    8 +
>  drivers/gpu/drm/mediatek/Makefile             |    2 +
>  drivers/gpu/drm/mediatek/mtk_dp.c             | 3419
> +++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_dp_reg.h         |  570 +++
>  drivers/gpu/drm/mediatek/mtk_dpi.c            |  272 +-
>  drivers/gpu/drm/mediatek/mtk_dpi_regs.h       |   38 +
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c   |    8 +
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h   |    1 +
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c        |    8 +-
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h        |    3 +
>  drivers/phy/mediatek/Kconfig                  |    8 +
>  drivers/phy/mediatek/Makefile                 |    1 +
>  drivers/phy/mediatek/phy-mtk-dp.c             |  200 +
>  drivers/video/hdmi.c                          |   82 +-
>  include/drm/dp/drm_dp_helper.h                |    2 +
>  include/drm/drm_edid.h                        |   26 +-
>  include/linux/hdmi.h                          |    7 +-
>  include/linux/soc/mediatek/mtk-mmsys.h        |    4 +-
>  22 files changed, 4765 insertions(+), 81 deletions(-)
>  create mode 100644
> Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h
>  create mode 100644 drivers/phy/mediatek/phy-mtk-dp.c

Hello all,

Due to the resource issue, I will keep upstreaming Guillaume's MT8195
dp/edp series.

I will check the comments for v8/v9/v10 and have some discussion with
you.

Thanks for your all comments.

BRs,
Bo-Chen