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Message-ID: <b81d91e4-a06d-40c6-8c08-23c3ea5bd945@rock-chips.com>
Date: Sat, 23 Dec 2023 19:14:03 +0800
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Subject: Re: [PATCH v2 1/3] ARM: dts: rockchip: Add psci for rk3036
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To: Alex Bee <knaerzche@gmail.com>, Andy Yan <andyshrk@163.com>,
 heiko@sntech.de, Kever Yang <Kever.yang@rock-chips.com>
Cc: krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org,
 devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
 zhengxing@rock-chips.com
References: <20231218105523.2478315-1-andyshrk@163.com>
 <20231218105523.2478315-2-andyshrk@163.com>
 <da10e2fc-3179-4bd5-88ed-b4d5f64a7191@gmail.com>
 <28216be5-810f-40d6-850b-a0fc590ffa3c@rock-chips.com>
 <a82481ca-b578-49a4-b0d0-974b6ee65c98@gmail.com>
 <74e497f5-0361-47f7-a410-4b20d3526d52@rock-chips.com>
 <18c16355-9140-45be-bd16-96fad8b184a4@gmail.com>
From: Andy Yan <andy.yan@rock-chips.com>
In-Reply-To: <18c16355-9140-45be-bd16-96fad8b184a4@gmail.com>
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Hi Alex,

On 12/22/23 23:37, Alex Bee wrote:
> Hi Andy,
> 
> Am 22.12.23 um 11:37 schrieb Andy Yan:
>> Hi Alex,
>>
>> On 12/21/23 23:58, Alex Bee wrote:
>>> Hi Andy,
>>>
>>> Am 21.12.23 um 02:07 schrieb Andy Yan:
>>>> Hi Alex:
>>>>
>>>> On 12/20/23 19:16, Alex Bee wrote:
>>>>> Hi Andy,
>>>>> Am 18.12.23 um 11:55 schrieb Andy Yan:
>>>>>> From: Andy Yan <andy.yan@rock-chips.com>
>>>>>>
>>>>>> The system will hang at bringup secondary CPUs
>>>>>> without psci node.
>>>>>>
>>>>>> Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
>>>>>>
>>>>>> ---
>>>>>>
>>>>>> (no changes since v1)
>>>>>>
>>>>>>   arch/arm/boot/dts/rockchip/rk3036.dtsi | 5 +++++
>>>>>>   1 file changed, 5 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm/boot/dts/rockchip/rk3036.dtsi b/arch/arm/boot/dts/rockchip/rk3036.dtsi
>>>>>> index 78686fc72ce6..5344803442a1 100644
>>>>>> --- a/arch/arm/boot/dts/rockchip/rk3036.dtsi
>>>>>> +++ b/arch/arm/boot/dts/rockchip/rk3036.dtsi
>>>>>> @@ -67,6 +67,11 @@ display-subsystem {
>>>>>>           ports = <&vop_out>;
>>>>>>       };
>>>>>> +    psci {
>>>>>> +        compatible = "arm,psci-1.0";
>>>>>> +        method = "smc";
>>>>>> +    };
>>>>>> +
>>>>> I don't think that's an good idea. 
>>>>
>>>> Why?
>>> It's only what I've been told before: We shoudn't add properties which
>>> depend on non-upstream software (if an upstream alternative exists). Also
>>
>>> I'm not sure what happens if somebody doesn't use downstream bootloader
>>> and PSCI can't be found: Would the board still be able to boot?
>>
>> The psci is released herel[0].
>> And also, there are only two rk3036 based boards in mainline:
>> rk3036-evb,rk3036-keylin, both of them from rockchip.
>> And the mainline support of these boards broken from linux 5.7(2020, see PATCH 3),
>> no one report this broken until I try to run this board now.
>> So maybe there is no such somebody will run into this situation.
>>
>>
>> [0]https://github.com/rockchip-linux/rkbin/tree/master/bin/rk30
>>
> Yeah sure, there are binary release for downstream optee implementations,
> but the won't work with upstream u-boot, since they are using a calling
> convention different from upstream optee os. I tried to add support for
> those, but it was rejected [0].
> 
> Upstream bootflow doesn't implement/need PSCI as it uses a SMP bringup
> method which is done in kernel only (see enable-method in cpu section). I
> guess that it doesn't work for you is most likely because the downstream
> tee os makes the cpu registers the upstream enable-method uses only
> accessible in a higher exception level.
> 
> I can undust my RK3036 evb board during christmas holidays and check whats
> broken for RK3036 in u-boot. Everything was working fine (including SMP

With one day bisect, I finally fond the mainline u-boot support for rk3036
was broken by this commit f113d7d30346 (" Convert CONFIG_SPL_STACK to Kconfig")

It makes rk3036 can't set SPL_STACK as rk3036 can't enable SPL_FRAMEWORK(very small sram)

I still don't have a proper patch to fix this issue.

Thank you very much for you explanation.
I think i should not add psci to mainline before the tee binary can be used by mainline u-boot.

Nice holidays!
> bringup w/o PSCI and upstream u-boot) when I was adding VPU support in 5.14
> [1]. I likely booted from TF-card rather than eMMC.
> 
> [0] https://patchwork.ozlabs.org/project/uboot/patch/20230718145715.1280201-6-knaerzche@gmail.com/
> [1] https://patchwork.kernel.org/project/linux-rockchip/patch/20210527154455.358869-11-knaerzche@gmail.com/
> 
> Nice holidays!
> 
> Alex
> 
>>>>
>>>>> You most likely need that because you have downstream bootloader installed on this board. PSCI implementation takes place in TEE-OS for Rockchips ARM SoCs. There is no support for RK3036 in upstream op-tee OS. It's pretty much the same for RK3128 and RK3288.
>>>>> If you use upstream u-boot it should be good as-is.
>>>>
>>>> Unfortunately, upstream u-boot also cannot boot up on this board.
>>>> At present, I haven't had time to debug what is going on.
>>>>
>>>> Another reason I want to use downstream u-boot it is: I try run
>>>> this board with mainline just because i want to test some community
>>>> patches about inno-hdmi driver, as you said "the inno-hdmi driver currently gets a lot of attention"[0]
>>>>
>>> Thanks for helping testing this.
>>>
>>> Alex
>>>
>>>> With a downstream u-boot I can easy switch between upstream kernel and downstream kernel(no need to replace other components)
>>>> if I found some function is not work as expected.
>>>>
>>>>
>>>> [0]https://patchwork.kernel.org/project/linux-rockchip/cover/20231219170100.188800-1-knaerzche@gmail.com/
>>>>>
>>>>> Alex
>>>>>>       timer {
>>>>>>           compatible = "arm,armv7-timer";
>>>>>>           arm,cpu-registers-not-fw-configured;
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Linux-rockchip mailing list
>>>>> Linux-rockchip@lists.infradead.org
>>>>> http://lists.infradead.org/mailman/listinfo/linux-rockchip