I use the case
testusb -a -t 1 -s 4096 -c 10
and find there is no ZLP after a transfer(4096 bytes), I use the
Mentor's own DMA
(CONFIG_USB_INVENTRA_DMA). but when just use PIO, there is ZLP.
In the musb_host_tx, the transfer will end with the case
} else if (dma && urb->transfer_buffer_length == qh->offset) {
done = true;
and don't check the URB_ZERO_PACKET like PIO.
please correct me if I am wrong.
2, Why clear the RX toggle bit every time enable a endpoint?
In the function musb_ep_program, when endpoint is IN, it will do
musb_rx_reinit-->musb_h_flush_rxfifo and force clear the RXCSR's
toggle bit(MUSB_RXCSR_CLRDATATOG), this may cause data toggle mismatch.
and In my SOC, it will break the transfer, because the SOC will silently
discard the data if there is a data toggle mismatch.
3, Is it possible for sharing the same irq line between MUSB and DMA?
My SOC shares the two interrupt with same irq line, so I fix the request_irq
with the flag IRQF_SHARED.
I do some basic test, seems it works, but I am not so sure, please
give me some advice.
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