linux-kernel - Re: [PATCH v4 5/5] arm64: dts: allwinner: a64: Run GPU at 432 MHz

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Date: Wed, 13 Mar 2024 19:19:35 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
 Samuel Holland <samuel@...lland.org>,
 Guido Günther <agx@...xcpu.org>,
 Purism Kernel Team <kernel@...i.sm>, Ondrej Jirman <megi@....cz>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Frank Oltmanns <frank@...manns.dev>
Cc: linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 Frank Oltmanns <frank@...manns.dev>, Erico Nunes <nunes.erico@...il.com>
Subject: Re: [PATCH v4 5/5] arm64: dts: allwinner: a64: Run GPU at 432 MHz

Dne nedelja, 10. marec 2024 ob 14:21:15 CET je Frank Oltmanns napisal(a):
> The Allwinner A64's GPU has currently three operating points. However,
> the BSP runs the GPU fixed at 432 MHz. In addition, at least one of the
> devices using that SoC - the pinephone - shows unstabilities (see link)
> that can be circumvented by running the GPU at a fixed rate.
> 
> Therefore, remove the other two operating points from the GPU OPP table,
> so that the GPU runs at a fixed rate of 432 MHz.
> 
> Link: https://gitlab.com/postmarketOS/pmaports/-/issues/805
> Acked-by: Erico Nunes <nunes.erico@...il.com>
> Signed-off-by: Frank Oltmanns <frank@...manns.dev>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index 57ac18738c99..c810380aab6d 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -107,14 +107,6 @@ de: display-engine {
>  	gpu_opp_table: opp-table-gpu {
>  		compatible = "operating-points-v2";
>  
> -		opp-120000000 {
> -			opp-hz = /bits/ 64 <120000000>;
> -		};
> -
> -		opp-312000000 {
> -			opp-hz = /bits/ 64 <312000000>;
> -		};
> -
>  		opp-432000000 {
>  			opp-hz = /bits/ 64 <432000000>;
>  		};
> 
>