linux-kernel - Re: [PATCH v1 4/4] arm64: dts: rockchip: rk3588-evb1: Enable GPU

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Date: Mon, 25 Mar 2024 17:06:32 +0100
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>
Cc: Heiko Stuebner <heiko@...ech.de>, linux-rockchip@...ts.infradead.org, 
	Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kernel@...labora.com
Subject: Re: [PATCH v1 4/4] arm64: dts: rockchip: rk3588-evb1: Enable GPU

Hi,

On Mon, Mar 25, 2024 at 04:53:08PM +0100, Boris Brezillon wrote:
> [...]
> > @@ -484,12 +490,15 @@ rk806_dvs3_null: dvs3-null-pins {
> >  
> >  		regulators {
> >  			vdd_gpu_s0: dcdc-reg1 {
> > +				regulator-always-on;
> 
> IIRC, this is only needed because of some bug in the power-domain
> driver (or elsewhere). Is there any other reason to flag those as
> always-on? I mean, it's working but probably not ideal from a PM
> standpoint, as that means the regulators will stay on even when the GPU
> is idle.

EVB1 needs it for the generic coupler infrastructure. The Linux
coupler code cannot handle non always-on regulators at the moment.
That's something, which could be improved, but I think for now we
can just make the regulator always-on for the EVB1. The EVB1 is not
running from a battery anyways.

Greetings

-- Sebastian

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