From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ezequiel Garcia Subject: AM335x USB DMA seems broken on ISOC URBs Date: Sun, 22 Dec 2013 02:59:46 -0300 Message-ID: <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]:44913 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750876Ab3LVF7b (ORCPT ); Sun, 22 Dec 2013 00:59:31 -0500 Content-Disposition: inline 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 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 tha= t 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, th= is 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! --=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