linux-kernel - Re: [PATCH v2] arm64: dts: imx8mm-venice-gw7901.dts: disable pgc

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Date:   Wed, 06 Oct 2021 18:26:24 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Tim Harvey <tharvey@...eworks.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: imx8mm-venice-gw7901.dts: disable
 pgc_gpumix

Am Mittwoch, dem 06.10.2021 um 08:38 -0700 schrieb Tim Harvey:
> Since commit b21269b12e48 ("arm64: dts: imx8mm: add GPC node") the
> GW7901 will hang during kernel init because it does not power the unused
> GPU voltage rails on the IMX8MM. Disable pgc_gpumix to work around this.
> 
> We also disable the GPU devices that depend on the gpumix power domain
> and pgc_gpu to avoid them staying in a probe deferred state forever.
> 
> Additionally as the MIPI voltage rail is also not connected on this
> board we disable pgc_mipi and disp_blk_ctrl.
> 
> Signed-off-by: Tim Harvey <tharvey@...eworks.com>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
> v2:
>  - also disable pgc_gpu to keep gpu from getting in probe deferred state
>  - also disable pgc_mipi and disp_blk_ctrl as the MIPI power rails are
>    not connected
> ---
>  .../dts/freescale/imx8mm-venice-gw7901.dts    | 24 +++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> index bafd5c8ea4e2..21c546c4628d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> @@ -255,6 +255,10 @@
>  	};
>  };
>  
> +&disp_blk_ctrl {
> +	status = "disabled";
> +};
> +
>  &ecspi1 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_spi1>;
> @@ -282,6 +286,14 @@
>  	};
>  };
>  
> +&gpu_2d {
> +	status = "disabled";
> +};
> +
> +&gpu_3d {
> +	status = "disabled";
> +};
> +
>  &i2c1 {
>  	clock-frequency = <100000>;
>  	pinctrl-names = "default";
> @@ -632,6 +644,18 @@
>  	status = "okay";
>  };
>  
> +&pgc_gpu {
> +	status = "disabled";
> +};
> +
> +&pgc_gpumix {
> +	status = "disabled";
> +};
> +
> +&pgc_mipi {
> +	status = "disabled";
> +};
> +
>  &uart1 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_uart1>, <&pinctrl_uart1_gpio>;