From: Chen Peter-B29397 <B29397@freescale.com>
To: Neil Zhang <zhangwm@marvell.com>,
Christoph Fritz <chf.fritz@googlemail.com>,
Fabio Estevam <festevam@gmail.com>,
Li Yang-R58472 <r58472@freescale.com>,
Felipe Balbi <balbi@ti.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"Hans J. Koch" <hjk@hansjkoch.de>, Daniel Mack <daniel@caiaq.de>
Cc: Oliver Neukum <oneukum@suse.de>,
Kukjin Kim <kgene.kim@samsung.com>,
Eric Miao <eric.y.miao@gmail.com>,
Estevam Fabio-R49496 <r49496@freescale.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Nicolas Ferre <nicolas.ferre@atmel.com>,
Haojian Zhuang <haojian.zhuang@gmail.com>,
Ido Shayevitz <idos@codeaurora.org>,
Ben Dooks <ben-linux@fluff.org>,
Thomas Dahlmann <dahlmann.thomas@arcor.de>,
Russell King <linux@arm.linux.org.uk>,
Chao Xie <cxie4@marvell.com>
Subject: RE: [RFC] [PATCH] usb: gadget: fix dtd dma confusion
Date: Wed, 9 May 2012 02:11:56 +0000 [thread overview]
Message-ID: <F281D0F91ED19E4D8E63A7504E8A649803B91E69@039-SN2MPN1-022.039d.mgd.msft.net> (raw)
In-Reply-To: <175CCF5F49938B4D99B2E3EF7F558EBE1A180E49BA@SC-VEXCH4.marvell.com>
=20
> >
> > after a while of testing and searching I can come up with a patch
> > that fixes g_ether <-> iperf for fsl_udc on ARM i.MX35.
> >
> > The sad part is that this kind of fix is already implemented for
> > marvell mv_udc driver since last year but still _not_ in the ~15
> > other *udc.c drivers.
> >
=20
It is a controller limitation (bug?) for chipidea controller when using
dtd list to handle multi-dtds situation. The controller will read dtd's
next pointer after this dtd's active bit has already been cleared.
Freescale has an errata for this problem's description and solution.
http://cache.freescale.com/files/dsp/doc/errata/IMX23CE.pdf
See 2858
BR,
Peter
next prev parent reply other threads:[~2012-05-09 2:12 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1333796272.3450.92.camel@lovely>
[not found] ` <F281D0F91ED19E4D8E63A7504E8A64980AFFE3@039-SN2MPN1-022.039d.mgd.msft.net>
[not found] ` <CAOMZO5AjQsNw7_4ETkB38mmuBXj4pnCwJwAsi4zC4b_83=Enfw@mail.gmail.com>
[not found] ` <20120409200656.GD2640@local>
[not found] ` <CAOMZO5BTrA8G6wwQZ3e6bydJX7UtG7jj2c29Ln7u_3_jyUGB+w@mail.gmail.com>
[not found] ` <20120410001017.GF2640@local>
[not found] ` <CAOMZO5A=sHeyoQ0PCd=09qGGKb0NjXi-kF5qyG+3U-GhD7rhzg@mail.gmail.com>
[not found] ` <20120410021151.GB23044@lovely.krouter>
[not found] ` <20120411073918.GA9180@lovely.krouter>
[not found] ` <CAOMZO5C729Ki0Bequ+s1nnrgt4NZWvwg3Wnjk4kHp=d9BtkeXw@mail.gmail.com>
2012-05-09 0:02 ` [RFC] [PATCH] usb: gadget: fix dtd dma confusion Christoph Fritz
2012-05-09 1:50 ` Neil Zhang
2012-05-09 2:11 ` Chen Peter-B29397 [this message]
2012-05-09 5:38 ` Christoph Fritz
2012-05-09 5:43 ` Chen Peter-B29397
2012-05-09 5:56 ` Christoph Fritz
2012-05-09 5:45 ` Neil Zhang
2012-05-09 6:04 ` Christoph Fritz
2012-05-13 22:51 ` Christoph Fritz
2012-05-14 1:11 ` Chen Peter-B29397
2012-05-14 4:21 ` Greg Kroah-Hartman
2012-05-20 23:17 ` [PATCH] usb: fsl_udc: errata - postpone freeing current dTD Christoph Fritz
2012-05-21 1:05 ` Chen Peter-B29397
2012-05-21 6:53 ` Christoph Fritz
2012-05-21 6:57 ` [PATCH v2] " Christoph Fritz
2012-05-21 7:25 ` Chen Peter-B29397
2012-05-21 19:04 ` Felipe Balbi
2012-06-04 11:30 ` Christoph Fritz
2012-06-04 11:37 ` Christoph Fritz
2012-06-10 18:41 ` Fabio Estevam
2012-06-12 19:40 ` Christoph Fritz
2012-06-13 1:17 ` Fabio Estevam
2012-06-04 14:59 ` Felipe Balbi
2012-06-04 15:24 ` [PATCH] usb: gadget: regression fix - useage of usb_ep Christoph Fritz
2012-10-19 10:22 ` [PATCH 0/7] update USB gadget driver fsl-usb2-udc Christoph Fritz
2012-10-19 10:24 ` [PATCH 1/7] usb: gadget: fsl_udc: simplify driver init Christoph Fritz
2012-10-19 10:24 ` Felipe Balbi
2012-10-19 10:24 ` [PATCH 2/7] usb: gadget: fsl_udc: protect fsl_pullup() with spin_lock Christoph Fritz
2012-10-19 10:25 ` Felipe Balbi
2012-10-19 10:24 ` [PATCH 3/7] usb: gadget: fsl_udc: convert to new ulc style Christoph Fritz
2012-10-19 10:27 ` Felipe Balbi
2012-10-19 10:24 ` [PATCH 4/7] usb: gadget: fsl_udc: drop ARCH dependency Christoph Fritz
2012-10-19 10:29 ` Felipe Balbi
2012-10-19 10:24 ` [PATCH 5/7] usb: gadget: fsl_udc: postpone freeing current dTD Christoph Fritz
2012-10-19 10:30 ` Felipe Balbi
2012-10-19 10:46 ` Christoph Fritz
2012-10-19 10:44 ` Felipe Balbi
2012-10-20 19:12 ` Christoph Fritz
2012-10-22 7:54 ` Felipe Balbi
2012-10-19 10:24 ` [PATCH 6/7] usb: gadget: fsl_udc: purge global pointer usb_sys_regs Christoph Fritz
2012-10-19 10:24 ` [PATCH 7/7] usb: gadget: fsl_udc: purge global pointer dr_regs Christoph Fritz
2012-10-19 15:36 ` [PATCH 0/7] update USB gadget driver fsl-usb2-udc Sascha Hauer
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