linux-kernel - Re: [PATCH 1/5] arm64: dts: rockchip: Add rk3399 vop and display-subsystem

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Message-ID: <4655605.dLm3uFpe8F@phil>
Date:   Fri, 14 Jul 2017 01:34:53 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Jacob Chen <jacob-chen@...wrt.com>
Cc:     linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        kever.yang@...k-chips.com, mark.yao@...k-chips.com,
        wxt@...k-chips.com, Yakir Yang <ykk@...k-chips.com>
Subject: Re: [PATCH 1/5] arm64: dts: rockchip: Add rk3399 vop and display-subsystem

Hi Jacob,

Am Donnerstag, 13. Juli 2017, 00:03:51 CEST schrieb Jacob Chen:
> Add devicetree nodes for rk3399 VOP (Video Output Processors), and the
> top level display-subsystem root node.
> 
> Later patches add endpoints (eDP, HDMI, MIPI, etc) that attach to the
> VOPs' output ports.
> 
> Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> Signed-off-by: Jacob Chen <jacob-chen@...wrt.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3399.dtsi | 65 ++++++++++++++++++++++++++++++++
>  1 file changed, 65 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> index e795135..300e500 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> @@ -1455,6 +1455,71 @@
>  		status = "disabled";
>  	};
>  
> +	vopl: vop@...f0000 {
> +		compatible = "rockchip,rk3399-vop-lit";
> +		reg = <0x0 0xff8f0000 0x0 0x1ffc>, <0x0 0xff8f2000 0x0 0x400>;

What is this second memory region doing? It looks like this is the meant
to cover VOP_GAMMA_LUT_ADDR, but can't you just map the whole area?
ChromeOS seems to be doing fine using the whole area as
	<0x0 0xff8f0000 0x0 0x3efc>
and I've also not seen any code changes actually mapping/using this
second area.


> +		interrupts = <GIC_SPI 119 IRQ_TYPE_LEVEL_HIGH 0>;
> +		clocks = <&cru ACLK_VOP1>, <&cru DCLK_VOP1>, <&cru HCLK_VOP1>, <&cru DCLK_VOP1_DIV>;
> +		clock-names = "aclk_vop", "dclk_vop", "hclk_vop", "dclk_source";

While I know that this is based on my idea on handling the hdmi pll-rate
requirements, I haven't found the matching code- and dt-binding-changes
posted to a list yet. 


Heiko