On Wed, Apr 07, 2010 at 03:10:29PM +0200, ext Gupta, Ajay Kumar wrote:
Hi,
-----Original Message-----
From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-
owner@xxxxxxxxxxxxxxx] On Behalf Of Felipe Balbi
Sent: Tuesday, April 06, 2010 9:09 PM
To: Gadiyar, Anand
Cc: Balbi Felipe (Nokia-D/Helsinki); ext Cai, Cliff; Mike Frysinger;
linux-usb@xxxxxxxxxxxxxxx; uclinux-dist-devel@xxxxxxxxxxxxxxxxxxxx; Greg
Kroah-Hartman; Subbrathnam, Swaminathan
Subject: Re: [PATCH 2/2 v2] USB: musb: disable double buffering for older
RTL versions
On Tue, Apr 06, 2010 at 01:46:29PM +0200, ext Gadiyar, Anand wrote:
>With g_zero, do you see a hang or do you have data corruption?
data corruption. But with our internal mode1 changes, we can use double
buffering with rtl1.8 on omap36xx, so at least rtl1.8 can work.
Felipe,
Have you ensured using either first 8K or second 8K of FIFO space
in your double buffering tests for OMAP35x?
don't remember right now. But I can only remember seeing that errata on
36xx not 34xx/35xx. Can you confirm that.
I think you are aware of a known issue on OMAP35x where two active
endpoints have to use FIFO either in first 8K or next 8K range. I think
double
buffering data corruption issue is linked to this known issue and can
be
avoided if we use FIFO space of first 8K or next 8K.
problem with this is the endpoint limitation. We would have to cope with
that if we want mode1 + dbuf to work.
--
balbi
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