[Letux-kernel] [PATCH RFC] ehci-omap: simple suspend implementation

Andreas Kemnade andreas at kemnade.info
Tue Feb 20 18:05:17 CET 2018

On Mon, 19 Feb 2018 11:41:36 +0200
Roger Quadros <rogerq at ti.com> wrote:

> If the Hardware SAR (Save and restore) functionality is enabled then
> everything will be restored by hardware after a sleep to wake transition.
> But you will need this patch to enable SAR for the USB power domain.
> https://lkml.org/lkml/2013/7/10/356
> Missing this might be the reason why things break for you after a system
> suspend/resume.
ehci_resume() has a force reset flag which should be enough to bring
the system to a known state. But I tried SAR. It did not help.

rmmod ehci_omap
modprobe ehci_omap
is enough to make the device disappear (with and without the patch).
rebooting is enough to make the device
appear again. That did once work, so I'll first check when did that

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