linux-kernel - Re: [PATCH v2 6/6] arm64: dts: rockchip: Add GPU power domain regulator dependency for RK3588

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Message-ID: <a4d94eab-8543-45e1-b657-fa7f12470538@kwiboo.se>
Date: Thu, 19 Sep 2024 13:33:25 +0200
From: Jonas Karlman <jonas@...boo.se>
To: Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Ulf Hansson <ulf.hansson@...aro.org>, Elaine Zhang
 <zhangqing@...k-chips.com>,
 Adrián Martínez Larumbe
 <adrian.larumbe@...labora.com>,
 Boris Brezillon <boris.brezillon@...labora.com>, Chen-Yu Tsai
 <wens@...e.org>, devicetree@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH v2 6/6] arm64: dts: rockchip: Add GPU power domain
 regulator dependency for RK3588

Hi Sebastian,

On 2024-09-19 11:12, Sebastian Reichel wrote:
> Enabling the GPU power domain requires that the GPU regulator is
> enabled. The regulator is enabled at boot time, but automatically
> gets disabled when there are no users.
> 
> If the GPU driver is not probed at boot time or rebound while
> the system is running the system will try to enable the power
> domain before the regulator is enabled resulting in a failure
> hanging the whole system. Avoid this by adding an explicit
> dependency.
> 
> Reported-by: Adrián Martínez Larumbe <adrian.larumbe@...labora.com>
> Tested-by: Adrian Larumbe <adrian.larumbe@...labora.com> # On Rock 5B
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3588-armsom-sige7.dts         | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588-base.dtsi                | 2 +-
>  arch/arm64/boot/dts/rockchip/rk3588-coolpi-cm5.dtsi          | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588-friendlyelec-cm3588.dtsi | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts               | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588-ok3588-c.dts             | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts           | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts              | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi               | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588s-coolpi-4b.dts           | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts        | 4 ++++
>  arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5.dts          | 4 ++++
>  12 files changed, 45 insertions(+), 1 deletion(-)
> 

Any reason why following rk3588 DTs was not updated?

rk3588-evb1-v10.dts
rk3588-nanopc-t6.dtsi
rk3588-quartzpro64.dts
rk3588s-gameforce-ace.dts
rk3588s-odroid-m2.dts

I also expect we may need to define domain-supply for the npu on rk3588
and also both gpu and npu on rk356x in a future series.

Similar freeze issue has been observed on rk356x when booting vendor
kernel with npu support enabled using mainline U-Boot and DT [1].

To work around that issue on rk356x the npu regulator could be changed
to always-on/boot-on to get past the kernel freeze [2].

[1] https://github.com/armbian/build/pull/7025#issuecomment-2291067748
[2] https://github.com/Kwiboo/u-boot-rockchip/commit/da31da4b68f858f54364a21b0dd00fef2ab0d0d6

Regards,
Jonas