linux-kernel - Re: [PATCH v1 3/4] arm64: dts: rockchip: rk3588-rock5b: Enable GPU

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Date: Mon, 25 Mar 2024 16:58:47 +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 3/4] arm64: dts: rockchip: rk3588-rock5b: Enable GPU

Hi,

On Mon, Mar 25, 2024 at 04:44:41PM +0100, Boris Brezillon wrote:
> On Mon, 25 Mar 2024 16:37:20 +0100
> Sebastian Reichel <sebastian.reichel@...labora.com> wrote:
> 
> > From: Boris Brezillon <boris.brezillon@...labora.com>
> > 
> > Enable the Mali GPU in the Rock 5B.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
> 
> I don't remember writing this patch ;-), maybe I screwed authorship at
> some point, dunno.

mh, I cherry-picked the DT patches from your branch before
cleaning them up.

> > Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> > index 1fe8b2a0ed75..096ee7a98b89 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> > @@ -180,6 +180,11 @@ &cpu_l3 {
> >  	cpu-supply = <&vdd_cpu_lit_s0>;
> >  };
> >  
> > +&gpu {
> > +	mali-supply = <&vdd_gpu_s0>;
> > +	status = "okay";
> > +};
> > +
> >  &i2c0 {
> >  	pinctrl-names = "default";
> >  	pinctrl-0 = <&i2c0m2_xfer>;
> > @@ -470,6 +475,7 @@ rk806_dvs3_null: dvs3-null-pins {
> >  
> >  		regulators {
> >  			vdd_gpu_s0: vdd_gpu_mem_s0: dcdc-reg1 {
> > +				regulator-always-on;
> 
> Hm, should we mention why the regulator is always on here?

In case of the EVB1 it's needed because the generic coupler driver
cannot handle regulators that are not always on. I'm not sure why
it was added for the Rock 5B. I will check if it works without that
flag.

Greetings,

-- Sebastian

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