linux-kernel - Re: [PATCH v2 1/3] arm64: dts: microchip: sparx5: do not use PSCI on reference boards

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Date:   Wed, 17 May 2023 14:25:56 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Robert Marko <robert.marko@...tura.hr>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, lars.povlsen@...rochip.com,
        Steen.Hegelund@...rochip.com, daniel.machon@...rochip.com,
        UNGLinuxDriver@...rochip.com, arnd@...db.de,
        alexandre.belloni@...tlin.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Conor Dooley <conor@...nel.org>
Cc:     luka.perkov@...tura.hr
Subject: Re: [PATCH v2 1/3] arm64: dts: microchip: sparx5: do not use PSCI on
 reference boards

On 21/02/2023 11:50, Robert Marko wrote:
> PSCI is not implemented on SparX-5 at all, there is no ATF and U-boot that
> is shipped does not implement it as well.
> 
> I have tried flashing the latest BSP 2022.12 U-boot which did not work.
> After contacting Microchip, they confirmed that there is no ATF for the
> SoC nor PSCI implementation which is unfortunate in 2023.
> 
> So, disable PSCI as otherwise kernel crashes as soon as it tries probing
> PSCI with, and the crash is only visible if earlycon is used.
> 
> Since PSCI is not implemented, switch core bringup to use spin-tables
> which are implemented in the vendor U-boot and actually work.
> 
> Tested on PCB134 with eMMC (VSC5640EV).
> 
> Fixes: 6694aee00a4b ("arm64: dts: sparx5: Add basic cpu support")
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
> Changes in v2:
> * As suggested by Arnd, disable PSCI only on reference boards

Patch seemed forgotten, so I applied it.
https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-dt.git/log/?h=next/dt64


Best regards,
Krzysztof