On Thu, Apr 29, 2010 at 11:34:01PM +0530, aditya uttam wrote:
> Dear all,
>
> I am a newbie and trying to understand Sarah xHCI driver code.
It might help if you add my email in the To or Cc, otherwise it gets
lost in my USB mailing list Maildir. :)
> in xhci_alloc_virt_device(), EP(Default control) ring has been
> allocated using the following call.
> dev->eps[0].ring = xhci_ring_alloc(xhci, 1, true, flags);
>
> But still I was unable to understand, how this EP will be accessed by
> the xHC, means where the EP ring was linked to dev context.
The endpoint ring is linked into the device context by writing the
dequeue pointer into the endpoint context. That code is
xhci_setup_addressable_virt_dev():
ep0_ctx->deq =
dev->eps[0].ring->first_seg->dma;
ep0_ctx->deq |= dev->eps[0].ring->cycle_state;
Sarah Sharp
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