linux-kernel - Re: [PATCH] arm64: dts: imx8mq: Set the correct gpu

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Message-ID: <aXevH8e+9qLhWO7D@lizhi-Precision-Tower-5810>
Date: Mon, 26 Jan 2026 13:14:55 -0500
From: Frank Li <Frank.li@....com>
To: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel@...i.sm
Subject: Re: [PATCH] arm64: dts: imx8mq: Set the correct gpu_ahb clock
 frequency

On Sat, Jan 24, 2026 at 02:55:48PM +0100, Sebastian Krzyszkowiak wrote:
> According to i.MX 8M Quad Reference Manual, GPU_AHB_CLK_ROOT's maximum
> frequency is 400MHz.

I checked datasheet

Nominal mode—the maximum
GPU frequency supported in
this mode is 800 MHz.

Does difference grade (industry vs consumer) impact max frequency?

Frank
>
> Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
> ---
>  arch/arm64/boot/dts/freescale/imx8mq.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> index 607962f807be..6a25e219832c 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> @@ -1632,7 +1632,7 @@ gpu: gpu@...00000 {
>  			                         <&clk IMX8MQ_GPU_PLL_OUT>,
>  			                         <&clk IMX8MQ_GPU_PLL>;
>  			assigned-clock-rates = <800000000>, <800000000>,
> -			                       <800000000>, <800000000>, <0>;
> +			                       <800000000>, <400000000>, <0>;
>  			power-domains = <&pgc_gpu>;
>  		};
>
>
> ---
> base-commit: 24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7
> change-id: 20260105-imx8mq-gpu-ahb-clock-139ba9ca9a6c
>
> Best regards,
> --
> Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
>