From: hdegoede@redhat.com (Hans de Goede)
To: linux-arm-kernel@lists.infradead.org
Subject: Need a phy function to enable / disable usb squelch detection
Date: Thu, 26 Mar 2015 20:17:26 +0100 [thread overview]
Message-ID: <55145B46.9020501@redhat.com> (raw)
Hi Kishon,
I've been debugging why some devices do not work with
the musb otg controller found on Allwinner SoC-s, and the
conclusion is not good, the Android kernel does a
poke to the phy before releasing the usb reset.
Now you did not want me to introduce any sunxi specific /
private phy functions in my initial patch-series for adding
sunxi support, but in this case I do not really see an
alternative, as this is a very platform specific hack
to work around an issue with the phy-s squelch detection
which causes it to see a squelch when reset is released
switching it to high speed mode when a lo speed device
is connected, after which things fall apart.
I'm open to some generic solution for this, but I do
not see one myself.
Thanks & Regards,
Hans
p.s.
A review of my existing sun4i-usb-phy otg support work
would be appreciated, this squelch thing is best left
as a fix on top.
next reply other threads:[~2015-03-26 19:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 19:17 Hans de Goede [this message]
2015-03-27 1:21 ` Need a phy function to enable / disable usb squelch detection Peter Chen
2015-03-27 8:17 ` Hans de Goede
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