linux-kernel - Re: [PATCH 2/4] arm64: dts: rockchip: Add RGA support to the PX30

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Message-ID: <f97d7661-834d-3fbf-2cd9-0b37c487e8f7@gmail.com>
Date:   Thu, 16 Apr 2020 16:02:38 +0200
From:   Johan Jonker <jbx6244@...il.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jacob Chen <jacob-chen@...wrt.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Heiko Stuebner <heiko@...ech.de>,
        Hans Verkuil <hansverk@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/4] arm64: dts: rockchip: Add RGA support to the PX30

On 4/16/20 3:55 PM, Paul Kocialkowski wrote:
> Hi,
> 
> On Thu 16 Apr 20, 15:44, Johan Jonker wrote:
>> On 4/16/20 3:24 PM, Paul Kocialkowski wrote:
>>> Hi,
>>>
>>> On Thu 16 Apr 20, 15:02, Johan Jonker wrote:
>>>> Hi Paul,
>>>>
>>>> The conversion of rockchip-rga.txt to rockchip-rga.yaml by myself just
>>>> has been approved by robh.
>>>
>>> Huh, I looked around for ongoing related work but missed it.
>>> I'll definitely rebase on top of your series and use the yaml description
>>> instead. Thanks!
>>>
>>>> Maybe place dts patches at the end of a patch serie.
>>>> Could you include a &rga patch if your device is supported in mainline,
>>>> so we can test with:
>>>> make ARCH=arm64 dtbs_check
>>>> DT_SCHEMA_FILES=Documentation/devicetree/bindings/media/rockchip-rga.yaml
>>>
>>> I tested with the PX30 EVB so I can surely add a node there if that turns
>>> out necessary (see below).
>>>
>>>> Johan
>>>>
>>>> On 4/16/20 1:50 PM, Paul Kocialkowski wrote:
>>>>> The PX30 features a RGA block: add the necessary node to support it.
>>>>>
>>>>> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
>>>>> ---
>>>>>  arch/arm64/boot/dts/rockchip/px30.dtsi | 11 +++++++++++
>>>>>  1 file changed, 11 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm64/boot/dts/rockchip/px30.dtsi b/arch/arm64/boot/dts/rockchip/px30.dtsi
>>>>> index 75908c587511..4bfbee9d4123 100644
>>>>> --- a/arch/arm64/boot/dts/rockchip/px30.dtsi
>>>>> +++ b/arch/arm64/boot/dts/rockchip/px30.dtsi
>>>>> @@ -1104,6 +1104,17 @@ vopl_mmu: iommu@...70f00 {
>>>>>  		status = "disabled";
>>>>>  	};
>>>>>  
>>>>> +	rga: rga@...80000 {
>>>>> +		compatible = "rockchip,px30-rga";
>>>>> +		reg = <0x0 0xff480000 0x0 0x10000>;
>>>>> +		interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH 0>;
>>>>> +		clocks = <&cru ACLK_RGA>, <&cru HCLK_RGA>, <&cru SCLK_RGA_CORE>;
>>>>> +		clock-names = "aclk", "hclk", "sclk";
>>>>> +		resets = <&cru SRST_RGA>, <&cru SRST_RGA_A>, <&cru SRST_RGA_H>;
>>>>> +		reset-names = "core", "axi", "ahb";
>>>>> +		power-domains = <&power PX30_PD_VO>;
>>>>
>>>> 		status = "disabled";
>>>
>>> As of 5.6, the rk3399 has the node enabled by default. Did that change?
>>
>> 'status' disappeared during review for rk3399 between v2 and v3, but
>> doesn't mention the reason. If someone can give more info here?
>>
>> https://lore.kernel.org/lkml/1500101920-24039-5-git-send-email-jacob-chen@iotwrt.com/
>>
>> https://lore.kernel.org/lkml/1501470460-12014-5-git-send-email-jacob-chen@iotwrt.com/
>>
>>>
>>> Since it's a standalone block that has no I/O dependency, I don't really see
>>> the point of disabling it by default.
>>
>> Vop, hdmi and other video devices are also disabled.
>> Follow the rest I think...
> 
> Well, these blocks do have related I/O ports so it makes sense not to enable
> them by default because of pinmux, or because there might be no connector
> populated/routed.
> 
> For a memory to memory internal block, I don't see any reason why.
> It's definitely not board-specific and having to add these nodes for every board
> that has them is kind of a pain and might be overlooked. This will easily result
> in the feature not being available for end users without having to change the
> dt.
> 
> Also, the vpu node is always enabled on rockchip (and sunxi) platforms.
> I think these are better examples to follow.

>From PX30 TRM-Part1:

Power domain is shared by vop and dsi.
It's up to the user what blocks he/she enables and what power it uses.

PD_VO: VOP_M, VOP_S, RGA and DSI

> 
> Cheers,
> 
> Paul
> 
>>>
>>> What do you think?
>>>
>>> Cheers,
>>>
>>> Paul
>>>
>>>>> +	};
>>>>> +
>>>>>  	qos_gmac: qos@...18000 {
>>>>>  		compatible = "syscon";
>>>>>  		reg = <0x0 0xff518000 0x0 0x20>;
>>>>>
>>>>
>>>
>>
>