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

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

[Paul Kocialkowski]

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-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
---
 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>;
 		};
 	};
 };
-- 
2.17.1

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

[Jernej Škrabec]

Hi!

Dne sreda, 27. junij 2018 ob 09:26:35 CEST je Paul Kocialkowski napisal(a):
> 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).

I think that current clock speed is on a bit conservative side because there 
is no thermal throttling support yet.

Best regards,
Jernej

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

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 1328 bytes --]

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-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
> ---
>  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