linux-kernel - Re: [PATCH] ARM: dts: sun8i-h3: Increase the GPU clock to 576 MHz

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Message-ID: <20180627200812.usm5ndoyrnmuhjrv@flea>
Date:   Wed, 27 Jun 2018 22:08:12 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Qiang Yu <yuq825@...il.com>,
        Giulio Benetti <giulio.benetti@...ronovasrl.com>,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: Re: [PATCH] ARM: dts: sun8i-h3: Increase the GPU clock to 576 MHz

On Wed, Jun 27, 2018 at 09:26:35AM +0200, Paul Kocialkowski wrote:
> It was reported (based on declarations from the Allwiner BSP) that the
> Mali 400 found on the H3 can be clocked up to 576 MHz.
> 
> The frequency was tested using the r6p2 out-of-tree driver and a Kodi
> userspace with associated r6p2 blobs, leading to a working result.
> 
> This increases the clock to 576 MHz, which directly increases the pixel
> throughput of the GPU (given the 1 pixel-per-cycle rate).
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  arch/arm/boot/dts/sun8i-h3.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> index 41d57c76f290..a14a63092dc6 100644
> --- a/arch/arm/boot/dts/sun8i-h3.dtsi
> +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> @@ -133,7 +133,7 @@
>  			resets = <&ccu RST_BUS_GPU>;
>  
>  			assigned-clocks = <&ccu CLK_GPU>;
> -			assigned-clock-rates = <384000000>;
> +			assigned-clock-rates = <576000000>;

This should really be fixed through the driver or through OPPs,
instead of just coding it here and hoping that it will remain set to
that rate.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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