From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
To: Felipe Balbi <balbi@ti.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-omap@vger.kernel.org, linux-usb@vger.kernel.org
Subject: AM335x USB DMA seems broken on ISOC URBs
Date: Sun, 22 Dec 2013 02:59:46 -0300 [thread overview]
Message-ID: <20131222055945.GA7194@localhost> (raw)
Hello,
While doing some experiments with the stk1160 driver (for "Easycap" TV video
capture devices), ran into problems using v3.13-rc4. The problem is that the
stk1160 IRQ handler receives no URBs at all.
When configuring with CONFIG_MUSB_PIO_ONLY this looks solved, but the
bandwidth requirements are too large for PIO (it's a raw video device) and the
video can't get captured.
Interesting enough, using an old backported for v3.2 stk1160 driver, this same
setup works with TI PSP v3.2 kernel. So, I guess it's some software bug in
either the cppi41 dmaengine or the musb.
I tried to compare the PSP to the mainline drivers but they seems *very*
different and really beyond my understanding.
Any ideas on how can I help debugging this?
Thanks!
--
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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next reply other threads:[~2013-12-22 5:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-22 5:59 Ezequiel Garcia [this message]
2014-01-17 16:27 ` AM335x USB DMA seems broken on ISOC URBs Ezequiel Garcia
2014-01-18 15:12 ` Daniel Mack
2014-01-20 11:15 ` Daniel Mack
[not found] ` <52DD055C.1090806-cYrQPVfZoowdnm+yROfE0A@public.gmane.org>
2014-01-20 11:25 ` Ezequiel Garcia
2014-01-20 23:26 ` Ezequiel Garcia
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