[PATCH 5/7] usb: gadget: fsl_udc: postpone freeing current dTD
balbi at ti.com
Fri Oct 19 21:44:16 EST 2012
On Fri, Oct 19, 2012 at 12:46:48PM +0200, Christoph Fritz wrote:
> On Fri, 2012-10-19 at 13:30 +0300, Felipe Balbi wrote:
> > On Fri, Oct 19, 2012 at 12:24:43PM +0200, Christoph Fritz wrote:
> > > USB controller may access a wrong address for the dTD (endpoint transfer
> > > descriptor) and then hang. This happens a lot when doing tests with
> > > g_ether module and iperf, a tool for measuring maximum TCP and UDP
> > > bandwidth.
> > >
> > > This hardware bug is explained in detail by errata number 2858 for i.MX23:
> > > http://cache.freescale.com/files/dsp/doc/errata/IMX23CE.pdf
> > >
> > > All (?) SOCs with an IP from chipidea suffer from this problem.
> > > mv_udc_core fixes this bug by commit daec765. There still may be
> > > unfixed drivers.
> > why aren't you using that driver instead ? Is it really necessary to
> > keep this driver around ? I would really like to see uniformization
> > towards that, if you use the same IP, then the same driver ought to
> > suffice.
> > What's the reason for not using drivers/usb/chipidea ?
> I thought about this too but wasn't able to use chipidea with
> MXC_EHCI_INTERNAL_PHY as it's called in fsl_udc.
that's a matter of writing the PHY driver, right ;-) It has nothing to
do with chipidea, actually :-)
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