From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ezequiel Garcia Subject: Re: AM335x USB DMA seems broken on ISOC URBs Date: Fri, 17 Jan 2014 13:27:24 -0300 Message-ID: <20140117162723.GB3843@localhost> References: <20131222055945.GA7194@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from top.free-electrons.com ([176.31.233.9]:56784 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751701AbaAQQ1M (ORCPT ); Fri, 17 Jan 2014 11:27:12 -0500 Content-Disposition: inline In-Reply-To: <20131222055945.GA7194@localhost> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Felipe Balbi , Sebastian Andrzej Siewior Cc: linux-omap@vger.kernel.org, linux-usb@vger.kernel.org On Sun, Dec 22, 2013 at 02:59:45AM -0300, Ezequiel Garcia wrote: > Hello, >=20 > While doing some experiments with the stk1160 driver (for "Easycap" T= V video > capture devices), ran into problems using v3.13-rc4. The problem is t= hat the > stk1160 IRQ handler receives no URBs at all. >=20 > 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. >=20 > 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 b= ug in > either the cppi41 dmaengine or the musb. >=20 > I tried to compare the PSP to the mainline drivers but they seems *ve= ry* > different and really beyond my understanding. >=20 > Any ideas on how can I help debugging this? >=20 Ping? It would be good to hunt thig bug down. The TI PSP provided USB d= river works fine so at least that's a starting point... --=20 Ezequiel Garc=C3=ADa, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-omap" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html