u-boot-brain/drivers/usb
Roger Quadros bb1f327d0a usb: ehci-omap: Don't softreset USB High-speed Host (UHH) Module
Fixes NFS root problems with Beagle (3530 ES1.0) when used with
external USB-ethernet adapter and "USB start" command used within
u-boot.

Soft resetting the UHH module causes instability issues on
all OMAPs so we just avoid it.

See OMAP36xx Errata
  i571: USB host EHCI may stall when entering smart-standby mode
  i660: USBHOST Configured In Smart-Idle Can Lead To a Deadlock

On OMAP4/5, soft-resetting the UHH module can put it into
Smart-Idle mode and lead to a deadlock.

On OMAP3 this doesn't seem to be the case but still instabilities
are observed on beagle (3530 ES1.0) if soft-reset is used.
 e.g. NFS root failures with Linux kernel.

Signed-off-by: Roger Quadros <rogerq@ti.com>
2013-07-29 23:01:33 +02:00
..
eth Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
gadget dfu: Implementation of target reset after communication with dfu-util's -R switch 2013-07-29 23:01:33 +02:00
host usb: ehci-omap: Don't softreset USB High-speed Host (UHH) Module 2013-07-29 23:01:33 +02:00
musb Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
musb-new usb, musb-new: add wdt trigger 2013-06-30 18:41:07 +02:00
phy Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
ulpi Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00