From: Sascha Hauer <s.hauer@pengutronix.de>
To: Alexander Shiyan <shc_work@mail.ru>
Cc: barebox@lists.infradead.org
Subject: Re: PCM038 USB is broken again
Date: Fri, 16 Aug 2013 10:01:39 +0200 [thread overview]
Message-ID: <20130816080139.GN26614@pengutronix.de> (raw)
In-Reply-To: <20130815233241.67b6727ce65114b59807f8ea@mail.ru>
On Thu, Aug 15, 2013 at 11:32:41PM +0400, Alexander Shiyan wrote:
> On Tue, 13 Aug 2013 08:26:07 +0200
> Sascha Hauer <s.hauer@pengutronix.de> wrote:
>
> > On Mon, Aug 12, 2013 at 02:56:56PM +0400, Alexander Shiyan wrote:
> > > ...
> > > And yes, this works after "usb" command:
> > > barebox@ConnectCore i.MX51:/ usb
> > > USB: scanning bus for devices...
> > > Found NXP ISP150x ULPI transceiver (0x04cc:0x1504).
> > > Bus 001 Device 001: ID 0000:0000 EHCI Host Controller
> > > 1 USB Device(s) found
> > >
> > > So, you consider this is not a bug?
> >
> > Doing the initialization twice is not nice and wasn't intended, so
> > indeed this is something worth fixing.
>
> Datasheet MCIMX51RM.pdf says:
> 60.3.8 ULPI/Serial MUX
> Host1, Host2, and OTG cores can be configured by software for ULPI or Serial PHY operation. The
> ULPI/Serial mux selects between ULPI interface signals and Serial PHY interface signals. The mux is
> controlled by the PHY Select signals from the USB core and is switched when the software selects the
> interface mode.
> The default configuration for the mux is Serial mode. Switching to ULPI mode is done by writing the
> Parallel Transceiver Select (PTS) bits in the PORTSC register with 0b10.
>
> So, we need to setup PORTSC to ULPI mode first.
Yes, ok. The problem is that fixing initialization on one board seems
to break it on another board. I'm a bit out of ideas since this
initialization shuffeling follows me for several years now. I have some
patches in my queue which I'll send the weekend. I hope this fixes it
for you while keeping HSIC workable.
Sascha
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prev parent reply other threads:[~2013-08-16 8:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-10 4:10 Alexander Shiyan
2013-08-12 7:07 ` Sascha Hauer
2013-08-12 10:56 ` Alexander Shiyan
2013-08-13 6:26 ` Sascha Hauer
2013-08-15 19:32 ` Alexander Shiyan
2013-08-16 8:01 ` Sascha Hauer [this message]
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