From: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
To: Kevin Cernekee <cernekee@gmail.com>
Cc: balbi@ti.com, ralf@linux-mips.org, sebastian@breakpoint.cc,
stern@rowland.harvard.edu, linux-mips@linux-mips.org,
linux-usb@vger.kernel.org
Subject: Re: [PATCH V3] usb: gadget: bcm63xx UDC driver
Date: Wed, 22 Aug 2012 09:48:15 +0200 [thread overview]
Message-ID: <20120822074815.GB3563@breakpoint.cc> (raw)
In-Reply-To: <5ff8f23aae05690ba89476c4924b9387@localhost>
On Tue, Aug 21, 2012 at 06:22:35PM -0700, Kevin Cernekee wrote:
Just one thing that bit while I was sleeping:
The HW acks SetConfig on its own. Once you notice this, you set
->ep0_req_set_cfg and set state in bcm63xx_ep0_do_idle() to
EP0_IN_FAKE_STATUS_PHASE. This is I guess the workaround for mass_storage's
hold with DELAYED_STATUS and continues with a zero packet.
Now two questions:
- If a gadget descides not NAK / stall the SetConfig requests. What happens
here?
- What happens if the host is faster than the UDC. SetConfig returns in
usb-storage with "DELAYED_STATUS". HW Acks this. Could the Host send another
request before the gadget queues the ep0 request?
Sebastian
next prev parent reply other threads:[~2012-08-22 7:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-22 1:22 [PATCH V3] usb: gadget: bcm63xx UDC driver Kevin Cernekee
2012-08-22 7:48 ` Sebastian Andrzej Siewior [this message]
2012-08-25 19:44 ` Kevin Cernekee
2012-08-25 20:48 ` Alan Stern
2012-08-25 20:48 ` Alan Stern
2012-08-26 19:30 ` Sebastian Andrzej Siewior
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