usb: renesas_usbhs: fix the condition of is_done in usbhsf_dma_push_done

This patch fixes the condition of is_done in usbhsf_dma_push_done().
This function will be called after a transmission finished by DMAC.
So, the function should check if the transmission packet is short packet
or not. Also the function should call try_run to send the zero packet
by the pio handler if the "*is_done" is not set. Otherwize, the
transaction will not finish if a gadget driver sets the "zero" flag
in a transmission.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 3efece3..1564829 100644 (file)
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -889,16 +889,29 @@ usbhsf_pio_prepare_push:
 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 {
        struct usbhs_pipe *pipe = pkt->pipe;
+       int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
 
-       pkt->actual = pkt->trans;
+       pkt->actual += pkt->trans;
+
+       if (pkt->actual < pkt->length)
+               *is_done = 0;           /* there are remainder data */
+       else if (is_short)
+               *is_done = 1;           /* short packet */
+       else
+               *is_done = !pkt->zero;  /* send zero packet? */
 
-       *is_done = !pkt->zero;  /* send zero packet ? */
        usbhs_pipe_running(pipe, !*is_done);
 
        usbhsf_dma_stop(pipe, pipe->fifo);
        usbhsf_dma_unmap(pkt);
        usbhsf_fifo_unselect(pipe, pipe->fifo);
 
+       if (!*is_done) {
+               /* change handler to PIO */
+               pkt->handler = &usbhs_fifo_pio_push_handler;
+               return pkt->handler->try_run(pkt, is_done);
+       }
+
        return 0;
 }