From: Andreas Kemnade <andreas@kemnade.info>
To: Adam Ford <aford173@gmail.com>
Cc: Linux-OMAP <linux-omap@vger.kernel.org>,
USB list <linux-usb@vger.kernel.org>,
stern@rowland.harvard.edu,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: ehci-omap unresponsive when used with external hub
Date: Tue, 12 Dec 2023 16:21:37 +0100 [thread overview]
Message-ID: <20231212162137.047f9337@aktux> (raw)
In-Reply-To: <CAHCN7xKGW4j6HsELJNbT10OyNX0zx2207nz=AQ97VxKJaEQkyg@mail.gmail.com>
On Tue, 12 Dec 2023 08:58:31 -0600
Adam Ford <aford173@gmail.com> wrote:
> I have been troubleshooting an issue with USB which appears to happen
> with AM3517, OMAP3530, and DM3730 in which the USB doesn't detect
> removal or connection of USB devices and interrupts stop occurring.
>
> In every case, I have the OMAP3 EHCI connected to a USB3220
> transceiver which is treated as configured in the device tree as
> usb-nop-xceiv with reset-gpios configured to enable it.
>
Also issues on GTA04 (DM3730):
The modem is behind it. There is an errata for that
combination.
Somehow reset/turning off does not work really. On GTA04
we have issues with current consumption during suspend.
including scenarios where there is a mismatch between state
of phy and what the omap side the state is.
What we do:
enable off-mode and force-reset of both sides.
and have this hack to solve at least the suspend issues:
https://lore.kernel.org/linux-omap/20180216171414.8097-1-andreas@kemnade.info/
Regards,
Andreas
prev parent reply other threads:[~2023-12-12 15:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 14:58 ehci-omap unresponsive when used with external hub Adam Ford
2023-12-12 15:21 ` Andreas Kemnade [this message]
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