Hi Cristian,
Will you find some time and motivation to add CEC support to Quad-Pixel (QP) TX controller ?
Probably you recall - I added initial CEC support to yours v1 series and i’m stuck with timing issue (cec pulses are 3x too long).
For me it looks like clock issue.
I’m out of ideas how to move forward with this timming issue….
> Wiadomość napisana przez Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx> w dniu 01.08.2024, o godz. 04:25:
>
> The Rockchip RK3588 SoC family integrates the Synopsys DesignWare HDMI
> 2.1 Quad-Pixel (QP) TX controller [4], which is a new IP block, quite
> different from those used in the previous generations of Rockchip SoCs.
>
> This is the last 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.
>
> Please note this is a reworked version of the original series, which
> relied on a commonized dw-hdmi approach. Since the general consensus
> was to handle it as an entirely new IP, I dropped all patches related to
> the old dw-hdmi and Rockchip glue code - a few of them might still make
> sense as general improvements and will be submitted separately.
>
> Additionally, as suggested by Neil, I've sent the reworked bridge driver
> as a separate patchset [4], hence this series handles now just the new
> Rockchip QP platform driver.
>
> It's worth mentioning the HDMI output support is currently limited to
> RGB output up to 4K@60Hz, without audio, CEC or any of the HDMI 2.1
> specific features. Moreover, the VOP2 driver is 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, as well as the bridge
> driver, are available at [3].
>
> So far I could only verify this on the RADXA Rock 5B board.
>
> 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-v6.11-rc1
> [4]: https://lore.kernel.org/lkml/20240801-dw-hdmi-qp-tx-v1-0-148f542de5fd@xxxxxxxxxxxxx/
>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
> ---
> Changes in v2:
> - Reworked the glue code for RK3588 into a new Rockchip platform driver
> - Moved bridge driver patches to a separate series [4]
> - Dropped all the patches touching to the old dw-hdmi and RK platform
> drivers
> - Added connector creation to ensure the HDMI QP bridge driver does only
> support DRM_BRIDGE_ATTACH_NO_CONNECTOR
> - Link to v1: https://lore.kernel.org/r/20240601-b4-rk3588-bridge-upstream-v1-0-f6203753232b@xxxxxxxxxxxxx
>
> ---
> Cristian Ciocaltea (3):
> dt-bindings: display: rockchip: Add schema for RK3588 HDMI TX Controller
> drm/rockchip: Explicitly include bits header
> drm/rockchip: Add basic RK3588 HDMI output support
>
> .../display/rockchip/rockchip,dw-hdmi-qp.yaml | 188 +++++++++
> drivers/gpu/drm/rockchip/Kconfig | 8 +
> drivers/gpu/drm/rockchip/Makefile | 1 +
> drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 430 +++++++++++++++++++++
> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 +
> drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 4 +-
> 6 files changed, 632 insertions(+), 1 deletion(-)
> ---
> base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
> change-id: 20240601-b4-rk3588-bridge-upstream-a27baff1b8fc
>
>
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