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Subject: [Bug 225713] Zynq/Zedboard GPIO driver can reset USB port on some
boards
Date: Tue, 06 Feb 2018 21:44:52 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D225713
Bug ID: 225713
Summary: Zynq/Zedboard GPIO driver can reset USB port on some
boards
Product: Base System
Version: CURRENT
Hardware: arm
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: arm
Assignee: freebsd-arm@FreeBSD.org
Reporter: thoma555-bsd@yahoo.com
Created attachment 190368
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D190368&action=
=3Dedit
patch for sys/arm/xilinx/zy7_gpio.c
The Zynq/Zedboard GPIO driver attempts to tri-state all GPIO pins on boot up
but the order in which I reset the hardware can cause the pins to be briefly
held low before being tri-stated. This is a problem on boards that use GPIO
pins to reset devices.
In particular, the Zybo and ZC-706 boards use a GPIO pin as a USB PHY reset=
.=20
If U-boot enables the USB port before booting the kernel, the GPIO driver
attach causes a glitch on the USB PHY reset and the USB port loses power. =
My
fix is to have the GPIO driver leave the pins in whatever configuration U-b=
oot
placed them.
--=20
You are receiving this mail because:
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