Re: [PATCH 00/14] Add initial support for the Rockchip RK3588 HDMI TX Controller

[Piotr Oniszczuk]

Cristian,

I'm hacking with adding cec support for rk3588 hdmi on 6.10-rc7 mainline. 

Cec kernel module is my backport from bsp. 
Module loads. Cec line (observed on osciloscope) has pulses when i'm issuing i.e. cec-ctl -d /dev/cec0 --phys-addr=1.0.0.0 —playback 

My issue is that timings are 2,9 times longer that should be (start bit is 10,7mS instead of 3.6; zero is 4.4 instead 1.5 while one is 1,7 instead of 0.6).

This suggests me issue is cec clock isn't? 

Looking on bsp code https://github.com/radxa/kernel/blob/linux-6.1-stan-rkr1/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp-cec.c#L186 there is nothing with clock. 

So probably issue is in 3588 clk code, or……
Maybe you have some hints how to move forward with this issue?


> Wiadomość napisana przez Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx> w dniu 01.06.2024, o godz. 15:12:
> 
> The RK3588 SoC family integrates a Quad-Pixel (QP) variant of the
> Synopsys DesignWare HDMI TX controller used in the previous SoCs.
> 
> It is HDMI 2.1 compliant and supports the following features, among
> others:
> 
> * Fixed Rate Link (FRL)
> * 4K@120Hz and 8K@60Hz video modes
> * Variable Refresh Rate (VRR) including Quick Media Switching (QMS)
> * Fast Vactive (FVA)
> * SCDC I2C DDC access
> * TMDS Scrambler enabling 2160p@60Hz with RGB/YCbCr4:4:4
> * YCbCr4:2:0 enabling 2160p@60Hz at lower HDMI link speeds
> * Multi-stream audio
> * Enhanced Audio Return Channel (EARC)
> 
> This is the last required component that needs to be supported in order
> to enable the HDMI output functionality on the RK3588 based SBCs, such
> as the RADXA Rock 5B. The other components are the Video Output
> Processor (VOP2) and the Samsung IP based HDMI/eDP TX Combo PHY, for
> which basic support has been already made available via [1] and [2],
> respectively.
> 
> The patches are grouped as follows:
> * PATCH 1..7: DW HDMI TX driver refactor to minimize code duplication in
>  the new QP driver (no functional changes intended)
> 
> * PATCH 8..11: Rockchip DW HDMI glue driver cleanup/improvements (no
>  functional changes intended)
> 
> * PATCH 12..13: The new DW HDMI QP TX driver reusing the previously
>  exported functions and structs from existing DW HDMI TX driver
> 
> * PATCH 14: Rockchip DW HDMI glue driver update to support RK3588 and
>  make use of DW HDMI QP TX
> 
> They provide just the basic HDMI support for now, i.e. RGB output up to
> 4K@60Hz, without audio, CEC or any of the HDMI 2.1 specific features.
> Also note the vop2 driver is currently not able to properly handle all
> display modes supported by the connected screens, e.g. it doesn't cope
> with non-integer refresh rates.
> 
> A possible workaround consists of enabling the display controller to
> make use of the clock provided by the HDMI PHY PLL. This is still work
> in progress and will be submitted later, as well as the required DTS
> updates.
> 
> To facilitate testing and experimentation, all HDMI output related
> patches, including those part of this series, are available at [3].
> So far I could only verify this on the RADXA Rock 3A and 5B boards.
> 
> Thanks,
> Cristian
> 
> [1]: 5a028e8f062f ("drm/rockchip: vop2: Add support for rk3588")
> [2]: 553be2830c5f ("phy: rockchip: Add Samsung HDMI/eDP Combo PHY driver")
> [3]: https://gitlab.collabora.com/hardware-enablement/rockchip-3588/linux/-/commits/rk3588-hdmi-bridge-v6.10-rc1
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
> ---
> Cristian Ciocaltea (14):
>      drm/bridge: dw-hdmi: Simplify clock handling
>      drm/bridge: dw-hdmi: Add dw-hdmi-common.h header
>      drm/bridge: dw-hdmi: Commonize dw_hdmi_i2c_adapter()
>      drm/bridge: dw-hdmi: Factor out AVI infoframe setup
>      drm/bridge: dw-hdmi: Factor out vmode setup
>      drm/bridge: dw-hdmi: Factor out hdmi_data_info setup
>      drm/bridge: dw-hdmi: Commonize dw_hdmi_connector_create()
>      drm/rockchip: dw_hdmi: Use modern drm_device based logging
>      drm/rockchip: dw_hdmi: Simplify clock handling
>      drm/rockchip: dw_hdmi: Use devm_regulator_get_enable()
>      drm/rockchip: dw_hdmi: Drop superfluous assignments of mpll_cfg, cur_ctr and phy_config
>      dt-bindings: display: rockchip,dw-hdmi: Add compatible for RK3588
>      drm/bridge: synopsys: Add DW HDMI QP TX controller driver
>      drm/rockchip: dw_hdmi: Add basic RK3588 support
> 
> .../display/rockchip/rockchip,dw-hdmi.yaml         | 127 +++-
> drivers/gpu/drm/bridge/synopsys/Makefile           |   2 +-
> drivers/gpu/drm/bridge/synopsys/dw-hdmi-common.h   | 179 +++++
> drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c       | 787 +++++++++++++++++++
> drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h       | 831 +++++++++++++++++++++
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c          | 353 +++------
> drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c        | 351 +++++++--
> include/drm/bridge/dw_hdmi.h                       |   8 +
> 8 files changed, 2290 insertions(+), 348 deletions(-)
> ---
> base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
> change-id: 20240601-b4-rk3588-bridge-upstream-a27baff1b8fc
> 
> 
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