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board/udoo/mx6qdl: disable usb host in device tree

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After BSP update Udoo Quad/Dual board once again hangs on boot. On a
new kernel disabling CONFIG_USB option is not enough to work around
the troublesome usb host on Udoo Quad/Dual board. So in order to be
future-proof it makes sense to disable usbh1 block in device tree
rather than fine-tune kernel configuration after BSP updates.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Sergey Matyukevich 2020-10-13 23:16:20 +03:00 committed by Thomas Petazzoni
parent 5e9c3425f8
commit 50290805b3
3 changed files with 27 additions and 2 deletions
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1
board/udoo/mx6qdl/linux.fragment
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@ -1 +0,0 @@
# CONFIG_USB is not set

26
board/udoo/mx6qdl/patches/linux/0000-udoo-disable-usbh1.patch Normal file
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@ -0,0 +1,26 @@
[PATCH] ARM: dts: imx6qdl-udoo: Disable usbh1 to avoid kernel hang
Currently the kernel hangs when USB Host1 is enabled due to the lack of
support for controlling the USB hub clock and GPIO reset line.
Peter Chen has made several attempts to fix this problem, but his series
has not been applied yet, so better disable USB host1 for now to avoid
the kernel hang.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
---
diff --git a/arch/arm/boot/dts/imx6qdl-udoo.dtsi b/arch/arm/boot/dts/imx6qdl-udoo.dtsi
index 828dd20cd27d..c9e122865312 100644
--- a/arch/arm/boot/dts/imx6qdl-udoo.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-udoo.dtsi
@@ -292,7 +292,8 @@ &usbh1 {
pinctrl-0 = <&pinctrl_usbh>;
vbus-supply = <&reg_usb_h1_vbus>;
clocks = <&clks IMX6QDL_CLK_CKO>;
- status = "okay";
+ /* currently USB support causes a kernel hang. Disable it for now */
+ status = "disabled";
};
&usbotg {

2
configs/mx6udoo_defconfig
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@ -3,6 +3,7 @@ BR2_cortex_a9=y
BR2_ARM_ENABLE_NEON=y
BR2_ARM_ENABLE_VFP=y
BR2_ARM_FPU_VFPV3=y
BR2_GLOBAL_PATCH_DIR="board/udoo/mx6qdl/patches"
# Linux headers same as kernel, a 5.8 series
BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_8=y
BR2_TARGET_GENERIC_GETTY_PORT="ttymxc1"
@ -20,7 +21,6 @@ BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_CUSTOM_VERSION=y
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.8.13"
BR2_LINUX_KERNEL_DEFCONFIG="imx_v6_v7"
BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/udoo/mx6qdl/linux.fragment"
BR2_LINUX_KERNEL_DTS_SUPPORT=y
BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6q-udoo imx6dl-udoo"
# required tools to create the SD card image