Comment 7 for bug 1825222

This is the 5.0 test kernel for Disco, please give it a try:
https://people.canonical.com/~phlin/kernel/lp-1825222-rockchip-arm64/D/

ubuntu@wright-kernel:~$ grep ROCKCHIP /boot/config-5.0.0-24-generic
CONFIG_ARCH_ROCKCHIP=y
CONFIG_PCIE_ROCKCHIP=y
CONFIG_PCIE_ROCKCHIP_HOST=m
CONFIG_PCIE_ROCKCHIP_EP=y
CONFIG_EMAC_ROCKCHIP=m
CONFIG_DWMAC_ROCKCHIP=m
CONFIG_ROCKCHIP_PHY=m
CONFIG_SPI_ROCKCHIP=m
CONFIG_PINCTRL_ROCKCHIP=y
CONFIG_ROCKCHIP_IODOMAIN=m
CONFIG_ROCKCHIP_THERMAL=m
CONFIG_VIDEO_ROCKCHIP_RGA=m
CONFIG_DRM_ROCKCHIP=m
CONFIG_ROCKCHIP_ANALOGIX_DP=y
CONFIG_ROCKCHIP_CDN_DP=y
CONFIG_ROCKCHIP_DW_HDMI=y
CONFIG_ROCKCHIP_DW_MIPI_DSI=y
CONFIG_ROCKCHIP_INNO_HDMI=y
CONFIG_ROCKCHIP_LVDS=y
CONFIG_ROCKCHIP_RGB=y
CONFIG_SND_SOC_ROCKCHIP=m
CONFIG_SND_SOC_ROCKCHIP_I2S=m
CONFIG_SND_SOC_ROCKCHIP_PDM=m
CONFIG_SND_SOC_ROCKCHIP_SPDIF=m
CONFIG_SND_SOC_ROCKCHIP_MAX98090=m
CONFIG_SND_SOC_ROCKCHIP_RT5645=m
CONFIG_MMC_DW_ROCKCHIP=m
CONFIG_VIDEO_ROCKCHIP_VPU=m
CONFIG_ROCKCHIP_TIMER=y
CONFIG_ROCKCHIP_MBOX=y
CONFIG_ROCKCHIP_IOMMU=y
CONFIG_ROCKCHIP_GRF=y
CONFIG_ROCKCHIP_PM_DOMAINS=y
CONFIG_DEVFREQ_EVENT_ROCKCHIP_DFI=m
CONFIG_ROCKCHIP_SARADC=m
CONFIG_PWM_ROCKCHIP=m
CONFIG_PHY_ROCKCHIP_DP=m
CONFIG_PHY_ROCKCHIP_EMMC=m
CONFIG_PHY_ROCKCHIP_INNO_HDMI=m
CONFIG_PHY_ROCKCHIP_INNO_USB2=m
CONFIG_PHY_ROCKCHIP_PCIE=m
CONFIG_PHY_ROCKCHIP_TYPEC=m
CONFIG_PHY_ROCKCHIP_USB=m
CONFIG_ROCKCHIP_EFUSE=m
CONFIG_CRYPTO_DEV_ROCKCHIP=m