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Enabling ROCKCHIP_DW_DP on RK3588 based devices to have working HDMI0 (next to HeadphoneJack one on a Rock 5 ITX)


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The HDMI0(Port next to Headphone Jack) is driven by DP1 on rk3588 via RA620(a dp2hdmi converter).

 

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/boot/dts/rockchip?h=v6.18&id=07c53a9e970712b1a479dd0ec4adfe184482c22f

 

ROCKCHIP_DW_DP is needed in order to have working 2nd HDMI port.

 

In menuconfig :  Device Drivers  --->   Direct Rendering Manager (XFree86 4.Graphics support  ---> 1.0 and higher DRI support)  --->     Rockchip specific extensions for Synopsys DW DP

 

 

<pre>

  │ CONFIG_ROCKCHIP_DW_DP:                                                                                                                                                  │  
  │                                                                                                                                                                         │  
  │ This selects support for Rockchip SoC specific extensions                                                                                                               │  
  │ to enable Synopsys DesignWare Cores based DisplayPort transmit                                                                                                          │  
  │ controller support on Rockchip SoC, If you want to enable DP on                                                                                                         │  
  │ rk3588 based SoC, you should select this option.                                                                                                                        │  
  │                                                                                                                                                                         │  
  │ Symbol: ROCKCHIP_DW_DP [=n]                                                                                                                                             │  

</pre>

 

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi?h=v6.18&id=64566e35757faded57a65d65e84b5ca95974ee19

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