[PATCH v3 0/5] Add initial support for the Rockchip RK3588 HDMI TX Controller

[Cristian Ciocaltea]

On 8/13/24 4:17 PM, Heiko Stübner wrote:
> Am Mittwoch, 7. August 2024, 13:07:22 CEST schrieb Cristian Ciocaltea:
>> The Rockchip RK3588 SoC family integrates the Synopsys DesignWare HDMI
>> 2.1 Quad-Pixel (QP) TX controller, which is a new IP block, quite
>> different from those used in the previous generations of Rockchip SoCs.
>>
>> The controller supports the following features, among others:
>>
>> * Fixed Rate Link (FRL)
>> * Display Stream Compression (DSC)
>> * 4K at 120Hz and 8K at 60Hz video modes
>> * Variable Refresh Rate (VRR) including Quick Media Switching (QMS)
>> * Fast Vactive (FVA)
>> * SCDC I2C DDC access
>> * Multi-stream audio
>> * Enhanced Audio Return Channel (EARC)
>>
>> 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.
>>
>> It's worth mentioning the HDMI output support is currently limited to
>> RGB output up to 4K at 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, are available at [3].
>>
>> So far I could only verify this on the RADXA Rock 5B board.
> 
> On a rk3588-tiger-haikou (including its DSI hat and my preliminary DSI
> driver) it also works.
> 
> Even with both DSI and HDMI at the same time. Both hdmi plugged in on
> boot and also plugging it in during runtime of the board, generates a
> clean image on my 1080p display.
> 
> So, series
> Tested-by: Heiko Stuebner <heiko at sntech.de>

Thanks for checking this out!

Regards,
Cristian