Re: Cannot stall an endpoint 0 control transfer from a data stage cal lback function

[Tony Lindgren <tony@atomide.com>]

* Geoffrey Tam <geoffrey@evertz.com> [070517 09:40]:
> For some reason, this did not make it into the mailing list archive, so I'm
> sending again.
> 
> -----Original Message-----
> From: Geoffrey Tam 
> Sent: Monday, May 14, 2007 2:24 PM
> To: 'tony@atomide.com'
> Cc: 'linux-omap-open-source@linux.omap.com'
> Subject: RE: Cannot stall an endpoint 0 control transfer from a data
> stage cal lback function
> 
> 
> I have tried using g_ep0.c from the linux-omap git tree
> (git://source.mvista.com/git/linux-omap-2.6.git). This resulted in compiler
> errors.
> 
> So, I tried copying all USB files:
> - driver/usb/* using "cp -R drivers/usb/*"
> - include/linux using "cp include/linux/usb*" and "cp include/linux/usb/*"
> This resulted in compiler errors when building the modules using "make
> ARCH=arm CROSS_COMPILE=arm_v5t_le- modules". Building the kernel worked
> fine. I'm not sure if there is a problem with my config.
> 
> I took a look at the code in the git tree. It did not look like any of my
> patch was implemented. Perhaps, I grabbed the wrong git tree?

That's the right tree. Well only one part of you patch seems to be
implemented there.

> My main problem is I need to stall endpoint 0 from the callback function
> when it is called either in the setup or data stage. The code seems to set
> the software state machine back to MGC_END0_STAGE_SETUP before the callback
> is called. This prevents software from setting the stall condition using
> musb_g_ep0_halt(). Also, the driver signals to the hardware before the
> callback is called that the data stage has completed. This prevents the
> hardware from setting the stall condition from the callback function.
> 
> I am not sure why the mass storage gadget fails to enumerate with my fixes.
> Unfortunately, my Davinci eval board does not like Linux 2.6.20 - it hangs
> shortly after it is loaded. So, I cannot look into this.

Yeah just tried it again, and all gadgets fail to enumerate after it..
Hopefully you'll get a chance to try it with the latest git tree at some
point :)

Tony