linux-kernel - Re: [PATCH 2/2] arm64: dts: rockchip: rockpro64 fix video output chain

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Date:   Wed, 5 Dec 2018 18:33:29 +0530
From:   agajjar <Akash_Gajjar@...tor.com>
To:     Oskari Lemmela <oskari@...mela.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Heiko Stuebner <heiko@...ech.de>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: dts: rockchip: rockpro64 fix video output
 chain


On 12/1/2018 3:38 PM, Oskari Lemmela wrote:
> Rockpro64 is not able boot if kernel is compiled with
> CONFIG_DRM_ROCKCHIP=m
>
> Enable Rockpro64 board HDMI output to fix issue.

Hi Oskari,

Could you please describe this issue in detail.

I am not able to reproduce this issue if CONFIG_DRM_ROCKCHIP is compile 
in or as a loadable module at the same time hdmi node is present or not.

> Signed-off-by: Oskari Lemmela <oskari@...mela.net>
> ---
>   arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
> index 5bd4d69914bd..be78172abc09 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
> @@ -205,6 +205,13 @@
>   	status = "okay";
>   };
>   
> +&hdmi {
> +	ddc-i2c-bus = <&i2c3>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&hdmi_cec>;
> +	status = "okay";
> +};
> +
>   &i2c0 {
>   	clock-frequency = <400000>;
>   	i2c-scl-rising-time-ns = <168>;