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

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Message-Id: <20211006153836.13760-1-tharvey@gateworks.com>
Date:   Wed,  6 Oct 2021 08:38:36 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     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
Cc:     Tim Harvey <tharvey@...eworks.com>
Subject: [PATCH v2] arm64: dts: imx8mm-venice-gw7901.dts: disable pgc_gpumix

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>
---
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>;
-- 
2.17.1