Re: Patch [2/2] DaVinci CPPI TX DMA tasklet

[Dmitry Krivoschekov <dmitry.krivoschekov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi Swami,

Swaminathan S wrote:
>     Signed-off-by: Swaminathan S <swami.iyer-l0cyMroinI0@public.gmane.org>
>     
>     This patch implements a tasklet to poll for TX Endpoint FIFO
>     empty status before completing a transfer.  This is required
>     in the context of DaVinci CPPI DMA Tx transfers.  CPPI
>     DMA engine generates completion interrupt before the data
>     actually moves out of TX FIFO 

I guess the DMA interrupt is generated after the data have been moved
from a s/w buffer to TX FIFO.
> and the driver needs to save the
>     Data toggle after ensuring that the FIFO is empty.

why don't rely on an endpoint interrupt which is generated after a USB
transaction is complete?


Thanks,
Dmitry



--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html